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Payroll Taxes and the Decision to be Self-Employed
Mark Stabile* Department of Economics
University of Toronto 150 St. George St., Toronto, ON, M5S 3G7 Phone: 416-978-4329, fax: 416-978-6713
Abstract This paper investigates and quantifies the role of payroll taxes in the decision to be self-employed. It examines the effects of introducing into the labour market a payroll tax which taxes employers, but which exempts the self-employed. It exploits two changes in the tax legislation to confirm that it is changes in legislation and not other sector specific trends that are driving the results. Our findings suggest that payroll taxes do indeed influence the decision to be self-employed, with the probability of self-employment increasing as taxes on employees increase and vice versa. Furthermore, there appear to be declines in the return to self-employement caused by the tax, possibly due to inefficient allocation of labour towards self-employment.
JEL Codes: H2, J2 Key Words: payroll taxes, self-employed
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1. Introduction
As expenses for targeted social programs, such as health insurance and retirement
programs, continue to increase, governments are often faced with the task of finding
ways to finance these benefits. In many cases programs are financed through several
methods, including both income and paryoll taxes. For example, the U.S. Medicare
program, which primarily serves the population ages 65 and over, is financed partly
through a payroll tax levied both on employees and employers as well as by general
income tax revenues. As pressure mounts in many countries to decrease income taxes,
the role of the payroll tax in financing universal benefit programs may become
increasingly important.
Economists have extensively studied how payroll taxes affect both labour supply
and wages. Recently, (see Bruce (2000) for example) research has also examined how
individuals may alter their labour supply to avoid paying taxes altogether. In particular, in
many cases individuals who are self-employed are exempt from part or all of payroll
taxes. Individuals may choose to become self-employed, in part, to avoid paying these
payroll taxes.
To the extent that taxes affect occupational choice, it is essential that policy
makers understand how taxes may promote or discourage entrepreneurship, and to
determine for whom such incentives will have the largest effects. This paper investigates
and quantifies the role of payroll taxes in the decision to be self-employed. It examines
the effects of introducing a payroll tax into the labour market which taxes employers, but
which exempts the self-employed. In particular, it examines the introduction of the
Employer Health Tax introduced by the province of Ontario in 1990. This is a
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particularly useful payroll tax to examine for two reasons. Firstly, the tax was introduced
only in one province, Ontario, providing a natural test and control group with which to
examine the impact of the tax. Secondly, the government changed the way the tax
affected the self-employed a few years after the tax was first introduced, providing a
second opportunity to study the response of the self-employed to the payroll tax. Since
we essentially observe the reform twice, the effects of interest are overidentified,
allowing us to be more sure that we do not mistake sector specific trends for the effects of
the reform (Baker and Benjamin, 1999). Our findings suggest that payroll taxes do indeed
influence the decision to be self-employed, with the probability of self-employment
increasing as taxes on employees increase and vice versa.
This paper also investigates the magnitude of any distortionary effects these taxes
may have. There appear to be real distortions caused by the tax due to changes in the
allocation of labour. We show evidence that wages among the self-employed declined
after the introduction of the payroll tax and that upon extending the payroll tax to the self-
employed, the wages in this sector increased.
The paper is organized as follows: section 2 reviews previous literature on both
payroll tax incidence and the decision to be self-employed. Section 3 outlines the tax
legislation under study. Section 4 introduces the empirical methodology. Section 5
describes the data used in the anlaysis. Section 6 presents the empirical results. Section 7
concludes.
2. Payroll Taxes and the Self-Employed
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Several papers which examine the incidence of payroll taxes—particularly their
effects on wages and employment. Most of the findings suggest that payroll taxes are
generally passed on to the worker in the form of lower wages (see for example Gruber
(1997) and Gruber and Krueger (1990). Anderson and Meyer (1997) examine the
incidence of a firm-varying payroll tax earmarked to finance a particular benefit—the
U.S. unemployment insurance premium. Their results suggest substantial wage effects
although they do not rule out potential employment effects. Studies in Canada are
summarized nicely in Kesselman (1997). Here the evidence is mixed with findings
ranging from no wage effects (Wilton and Prescott, 1996) to full shifting of the tax onto
labour (Beach et al, 1995 ).
Previous work has also examined the effects of tax rates on the decision to be
self-employed. Blau (1987) uses aggregate U.S. time-series data to examine the changes
in self-employment between 1948 and 1982. He finds evidence that higher marginal tax
rates in the upper income brackets of the personal income tax have a positive effect on
self-employment and that the opposite is true in lower income brackets. Gentry and
Hubbard (2000) examine the effects of marginal tax rates and income progressivity on
entrepreneurial entry and find significant increases in entrepreneurial entry when tax rates
are less progressive. Using pooled US and Canadian data between 1983 and 1994
Schuetze (2000) finds that increases in average income tax rates have large and positive
effects on the rate of male self-employment. Each of these studies has examined the
impact of personal income taxes on the decision to be self-employed. Moore (1983)
examines the incidence of the payroll tax on the decision to be self-employed using cross
sectional data from the 1978 Current Population Survey and finds that increases in
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payroll taxes lead to increases in the probability of self-employment. One potential
limitation of this study is that all the variation is from a single cross section. Therefore, an
individual’s income in one state is used to calculate tax rates in both the self-employed
and wage and salary state. More recent work by Bruce (2000) examines the effect of
marginal tax rates from wage employment versus self-employment on the decision to
become self-employed using data from the Panel Study of Income Dynamics and
exploiting changes in payroll taxes over time. Bruce finds that increasing marginal tax
rates on self-employment income increases the probability of becoming self-employed.
3. The Ontario Employer Health Tax
The Ontario Employer Health Tax was introduced as a means to abolish Medicare
premiums in Ontario (Kesselman, 1997). The tax was announced on May 17, 1989 and
came into effect on January 1, 1990. Prior to the introduction of the tax workers were
required to pay lump-sum OHIP premiums based on either an individual or family rate.
Part of these premiums were paid by employers on behalf of these employees. All
individuals were required to pay OHIP premiums although there were assistance plans for
individuals and families with low incomes. When the payroll tax was introduced, the
premiums were abolished, although the payroll tax was not earmarked specifically for
health care1. The budget literature available made no suggestion that the new tax would
be a temporary measure. The payroll tax covers all major forms of employee
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compensation and fringe benefits (excluding employer pension contributions). The
statutory incidence of the tax is exclusively on the employer.
The tax rate varies by the size of the payroll, ranging from 0.98% of employer
payroll to a maximum value of 1.95% of payroll. While the self-employed were required
to pay OHIP premiums prior to the payroll tax, the original payroll tax exempted all self-
employed individuals. Beginning in 1993, the Ontario government also included self-
employed individuals in the payroll tax. Self-employed individuals were exempt from the
payroll tax for up to $40,000 of total net self-employment income2 and were subjected to
a graduated payroll tax after that (Ontario Budget, 1989). Table 1a and 1b show the
range and magnitude of the payroll tax for both employers and the self-employed.3 To
give some idea of the burden of the payroll tax, a firm with ten or more employees, and a
yearly payroll of $400,000 (CND) or more faced a payroll tax of 1.95%. This amounts to
roughly $800 per employee on average, although one might expect that the burden of the
tax would increase proportionately with income.
4. Empirical Strategy
This paper attempts to measure the impact of tax policy on the decision to be self-
employed. In particular, we examine whether the introduction of a payroll tax encouraged
individuals to become self-employed in order to avoid payroll taxes. Although the payroll
tax is relatively small at a maximum of 1.95% of payroll, when combined with existing
payroll taxes, the resulting effect of such a tax on the decision to be self-employed may
be significant on the margin. Individuals will consider the total tax differential between
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salary and self-employment earnings, which may be considerably larger than the payroll
tax alone, when making employment decisions. This paper uses the exogenous changes in
this differential, the changing payroll tax legislation, to examine the marginal effect of
the different tax treatment of the self-employed.
In order to identify this effect we examine the decision to be self-employed both
before and after the introduction of the payroll tax. Since there are many other factors that
might affect the decision to be self-employed, we contrast individuals in Ontario, where
the payroll tax came into effect, with two plausible control groups. First, we use other
provinces in Canada that had a stable payroll tax environment over the period in question.
The control provinces include British Columbia, Alberta, Saskatchewan, and the
Maritime provinces excluding Newfoundland. Newfoundland, Manitoba and Quebec are
excluded because they have their own payroll taxes and experienced rate changes during
the period in question that might affect the decision to be self-employed in those
provinces. The remaining control provinces did not have any payroll taxes in effect over
this period, with the exception of premiums for workers’ compensation program, the rates
of which changed very little from year to year. At the federal level, payroll taxes are
used to finance Employment Insurance and the Canada Pension Plan. While these rates
varied slightly over this time, they affected all workers in our sample equally (only
Quebec sets its own rate rates for its pension program (Baker and Benjamin, 1999)). As a
second control group we use American states that immediately border Ontario (Ohio,
Michigan and New York). While there may be more regulatory differences between US
states and Canadian provinces, the economies of neighboring states are quite similar to
that of Ontario. The empirical specification outlined below assumes Canadian provinces
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as the relevant control group, but the analysis is identical for the control group of
American states.
We use a simple difference-in-differences estimator to examine the impact of
being self-employed in Ontario before and after the introduction of the 1990 payroll tax
as compared to other provinces in Canada which do not include a payroll tax:
),,(),,(ˆafterOtherselfbeforeOtherselfafterOntselfbeforeOntselfdd −−−=δ (1)
where self is the propensity to be self-employed in either Ontario or the other control
provinces in either before or after the legislative change. The difference-in-differences
estimator, ddδ̂ , is the difference in the propensity to be self-employed in Ontario after the
introduction of the payroll tax, relative to changes in the propensity to be self-employed
in the control provinces. We attribute the difference-in-differences to be due to the
introduction of the payroll tax, and as such we expect that ddδ̂ will be positive, reflecting
the fact that by exempting the self-employed from the payroll tax, more individuals will
choose to be self-employed.
We can expand the difference-in-differences framework into a multivariate
framework which controls for other factors which one might expect to affect the
propensity to be self-employed such as income, occupation, sex, and marital status, by
modeling the decision to be self-employed as a probit equation of the following form:
ittiititit XProvinceYearOntarioYearself εδβββ ++++= 321 * (2)
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The coefficient on the interaction between Year*Ontario is the multivariate version of the
difference-in-differences estimator. Year represent year fixed effects and Province are
province fixed effects. The interaction term between Year and Ontario is the interaction
between residing in Ontario and a dummy for the post-reform years. X is a vector of other
observed demographic characteristics including income, sex, marital status, age, industry
and occupation. X includes the provincial or state unemployment rate to account for more
global factors that might affect self-employment. We also experiment with specifications
that include a linear time trend to account for the increase in self-employment across all
regions over this time period. Our results are robust to the inclusion of these trends.
Standard errors are cluster-corrected at the province level, using the cluster command in
Stata, since the variation is not at the individual level, but across provinces over time.
If the introduction of the payroll tax in Ontario affected the propensity to be self-
employed, we would then expect that with the 1993 change in tax legislation, which no
longer excluded the self-employed with incomes over $40,000 from the payroll tax, part
of the effect of the 1990 payroll tax would be reversed. Since only those self-employed
with total self-employment income greater than $40,000 were affected by the tax, we
would not expect an effect of the same magnitude, but we should see some decline in the
propensity to be self-employed since the payroll tax advantages of being self-employed
have been removed. To model this we repeat the univariate and multivariate differences-
in-differences exercise for the period pre and post 1993 to see whether, in fact, the
propensity to be self-employed is again responsive to the change in payroll tax exempt
status. We first perform a similar difference-in-differences analysis to the one outlined
above, with the a priori expectation that the propensity to be self-employed will move in
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the opposite direction. However, only individuals earning $40,000 or less were exempt
from the tax, all other self-employed individuals were subject to the payroll tax as of
1993. If we were to examine only those individuals with more than $40,000 we might be
concerned that earnings are endogenously determined, in part, based on cutoff levels for
tax exemptions. To account for this we predict whether individuals will have earnings
greater than $40,000 using educational attainment. This procedure is in keeping with
previous literature (see, for example, Baker 2002) and the correlation between education
and income in our sample is very high. We examine only those individuals with some
college education or higher. The consistency of our results across the two tax changes
allows us to ensure that we are measuring the effects of the payroll tax and not
provincial-specific trends.
During the period 1990-1995 relatively few other changes that affected the self-
employed in Ontario. There were various changes in the income tax schedule that
differed in Ontario from the control groups. To control for the potential effects of income
taxes on the decision to be self-employed, we calculate individual marginal tax rates on
employment income and include this variable in our analysis. To control for endogeneity
in the marginal tax rate, potentially caused by individuals changing their marginal tax rate
by becoming self-employed, we instrument for the individual’s marginal tax rate using
changes in provincial income tax rates over time. This methodology, also used by Bruce
(2000), amounts to using the difference in the marginal tax rates faced by the same
individual, with the same income, but under different income tax structures as the
instrument for the tax rate. The variation in marginal tax rates that we impose on
individuals comes from changes in provincial income tax rates that occurred in various
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provinces over this time period. Since we are using only changes in tax rates and not
changes in individual behavior to generate the instrument, the instrument is free from the
endogeneity problem noted above.
There were other small legislative changes that we believe do not complicate our
analysis. In 1992 and 1993 Ontario changed the tax rate on the taxable income of small
businesses, but these taxes affected both the self-employed and non-self-employed alike
(Ontario Budget, various years). In 1994 the government exempted employers from the
Employer Health Tax for any new employees for a period of one year. While this may
have provided a limited term incentive to hire more employees, the exemption was only
for one year, was stated as such, and did not apply to any existing employees (Ontario
Budget, various years). The stated short and temporary nature of this one-year change
makes it unlikely that there would be large changes in worker behavior. We use three
years of post-1993 data to help control for any effects of this one-year exemption.
The control provinces look similar to Ontario in other observable respects. Mean
ages, education levels, percent male, percent married, and hours worked are all
practically identical between Ontario and the control provinces in 1988, the base year for
our analysis. Average income levels are higher in Ontario than in the control provinces
and this remains true in all our sample years. The percent of workers in various
occupations is also quite similar between Ontario and the control provinces. The two
exceptions to this are that the control provinces have a larger share of workers in
agricultural occupations and Ontario has a slightly larger share in product fabricating
occupations. Since many workers in the agricultural sector are self-employed, we repeat
all of our analyses with and without workers in the agricultural sector to be sure that this
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difference is not driving our results. Our results are robust to this exclusion and we report
results both with and without agriculture workers below. We include province-specific
dummy variables to capture any permanent structural differences between Ontario and
the control provinces. Means for Ontario and the control provinces are reported in
Appendix A.
5. Data
We use data from the annual Canadian Survey of Consumer Finances. We pool
cross-sections from the 1989 (1988 income year), through 1997 (1996 income year)
surveys, excluding the income years 1990 and 1993 as those were the years that the
legislation in question changed. The Canadian Survey of Consumer Finances contains
income information, labour force characteristics and demographic characteristics for
individuals aged 15 and over. In each year we have data on earnings from various sources
and on which of these sources was the individual’s primary source of earnings. We
eliminate individuals in Newfoundland, Quebec and Manitoba from the sample because
these three provinces had their own payroll taxes in place during the time of our analysis.
We use data from the 1988 and 1989 income years as the pre-payroll-tax period, from the
1991 and 1992 income years as the post-payroll-tax and pre-self-employed-tax period,
and the 1994, 1995, and 1996 income years as the post-self-employed-tax period.4 We
estimate the effects of the two reforms separately to allow for flexibility in all the
coefficients over time and to facilitate sample restrictions for the second tax change. We
examine only those individuals who reported themselves as working in the previous year.
Our sample consists of approximately 25,000 workers per year from the seven remaining
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provinces, aged fifteen through eighty, of which approximately 3,000 are categorized as
self-employed each year.
We define individuals as self-employed during the previous year if they are
working and claim self-employment income as their major source of income in that year.
We choose this definition of self-employment because the questions refer to the same job
as the income questions refer to. There is an alternate question in the Survey of Consumer
Finances that refers to the current year; however, we cannot link this question to the job
for which we have income information in the survey.5 The self-employment rate rose
between 1988 and 1995—the period during which the tax changes took place in Ontario.
In 1988, 6.6 percent of working Canadians in our sample claimed self-employment
income as their primary income source. By 1995, that number had increased to 8.8
percent. If we exclude the self-employed who work in agriculture, the self-employment
rate went from 5.3 to 7.6. Figure 1 shows the change in the self-employment rate over
time, excluding workers in the agriculture sector.6 Both Ontario and the control provinces
show an upward trend in rates of self-employment, consistent with the findings in
Schuetze (2000)7. The alternate measure of self-employment (not shown in the figure)
results in a slightly higher self-employment rate in each year (between 1 and 1.5
percentage points) that is, at least in part, due to the upward trend in self-employment
rates. The time trends in the self-employment rates are similar between the two measures.
We also use data on individual marginal tax rates by province and year. These
rates account for federal and provincial taxes and surtaxes as well as for standard
deductions available to all tax filers. The rates do not take into account potential
13
deductions for children and a spouse. To account for changes in the self-employment rate
due to changes in income taxes, we include these marginal tax rates in our analyses.
For the U.S. states we use data from the March samples of the Current Population
Survey (CPS) for the same years as the Survey of Consumer Finances listed above. The
CPS contains demographic and labour force information for approximately 150,000
individuals. Like the SCF, the income questions in the Current Population survey refer to
the previous year. To try to ensure consistency across the two samples, we use the CPS
questions on self-employment that refer to the same year as the income questions. For our
sample of three states, Michigan, Ohio and New York, we have approximately 10,000
observations per year of which approximately 6% on average are self-employed. Data on
the unemployment rate are from CANSIM for Canada and from the Bureau of Labor
Statistics for the United States8.
6. Empirical Results
6.1 The Propensity to be Self-Employed
The empirical strategy involves two tests. The first test examines whether the
propensity to be self-employed in the test province (Ontario) differed after the
introduction of the payroll tax relative to the control provinces. The second test examines
whether the movement towards self-employment altered, in part, after the exemption
status for self-employed workers was partially revoked. We perform these analyses by
examining a simple difference-in-differences between the test and control provinces
before and after the payroll tax changes and then expanding this difference-in-difference
14
into a regression framework to control for a variety of other potential factors which might
influence the decision to be self-employed.
We first examine the effects of the introduction of the payroll tax in 1990 on the
probability of being self-employed as we define it above (reported in Table 2). Prior to
the introduction of the legislation approximately 6% of workers in Ontario were self-
employed versus 8.6% in the control provinces. After the introduction of the legislation,
7% of workers in Ontario were self-employed versus 8.6% in the control provinces, a
statistically significant difference-in-differences of approximately 1 percentage point.
This suggests that the introduction of the payroll tax coincided with an increase in self-
employment in Ontario versus the control provinces.
There are several other factors that might influence the decision to be self-
employed. For example, the probability of being self-employed differs considerably
across occupations, industry, and by income and education level. Further,
macroeconomic cycles resulting in changes in unemployment rates may lead individuals
into or out of self-employment. To be sure that these differences are not driving the
change reported above, we expand the analysis into a multivariate framework. We report
these results in Table 3. After controlling for the individual’s total income, education,
marital status, age, occupation, industry, and the provincial level unemployment rate, the
difference-in-differences result remains with a 0.8 percentage point increase in the
probability of being self-employed in Ontario after the introduction of the payroll tax
versus the change in the control provinces over the same time period. The occupation
controls are jointly significant. Income is positively correlated with being self-employed.
Individuals with a university degree are more likely to be self-employed than individuals
15
with other levels of education. The unemployment rate does not significantly affect self-
employment rates with the inclusion of the other control variables. To test the robustness
of the results, we try several other specifications. We repeat the analysis for men and
women separately (not shown here). For men the effect of the payroll tax is practically
identical. For women the results are slightly smaller but remain positive and significant.
We also re-run the analysis excluding the occupational and industry level dummy
variables and both including and excluding linear time trends. Again the main results are
almost identical. We also include marginal tax rates for individuals in the sample. These
tax rates differ by income and province and reflect an individual’s combined federal and
provincial marginal tax rate, including surtaxes and standard deductions9. Our results
suggest that an individual’s marginal tax rate is negatively correlated with the probability
of being self-employed10. Including the marginal tax rates has almost no effect on our
difference-in-differences estimate of the impact of the payroll tax.
The third column of Table 3 excludes agricultural workers from our sample. We
exclude these workers since self-employed farmers may be less able to enter or exit self-
employment following changes in the payroll tax. We find that the probability of being
self-employed in Ontario after the introduction of the tax, relative to the control group,
increases by 0.9 percentage points, quite similar to the full sample results. The fourth
column reports the two-stage results for the effect of the payroll tax using changes in
income tax laws as an instrument for the marginal tax rate. The coefficient on the
difference-in-differences is slightly larger than the single stage probit results, and
identical to results obtained from linear probability models (not shown here) at 1.4
percentage points, and remains statistically significant. The t-statistic on the excluded
16
instrument in the first stage is 40.4 and the R-squared for the first stage is 0.66. The
complete first stage results are reported in Appendix B.
Overall, both the standard difference-in-differences and the multivariate
regressions show an increase in the propensity to become self-employed after the
introduction of the payroll tax in Ontario versus the same time period in other provinces.
The magnitude of the effects is not inconsistent with Abbott and Beach (1997), who find
that a one percentage point rise in the employer tax rate reduces employment by 0.9
percent to 3.3 percent.
As noted above, the self-employed exemption from the payroll tax was altered in
1993. The legislation was changed so that self-employed individuals who were earning
less than $40,000 were exempt from the payroll tax, but those self-employed earning
more than $40,00 were subject to a graduated tax rate. Since the introduction of the
payroll tax in Ontario affected the propensity to be self-employed we should see some
reversal of this effect after the tax exemptions were altered a few years later. To test this
we predict whether there is a decline in the propensity to be self-employed after the
change in legislation. Table 4a presents the results. Relative to the control provinces,
after the change in the tax rate, self-employment levels were lower in Ontario. Rates of
self-employment increased for both the control provinces and Ontario over the test
period. In the control provinces the rate of self-employed rose from 8.6 percent to 10.0
percent. In Ontario the self-employment rate rose from 6.8 to 7.7 percent – a statistically
significant difference-in-differences of 0.5 percentage points.
If we limit the sample to those individuals who we predict to have earnings of
greater than $40,000, the results are quite similar. We use only those individuals with
17
education levels of some college or greater as a predictor of whether an individual earns
more than $40,00011. The results are presented in Table 4b. The propensity to be self-
employed fell in Ontario relative to the control provinces by 0.5 percentage points,
although this estimate is not quite significant at the 10 percent level (t=1.25).
We expand the analysis of the 1993 tax change to a multivariate framework,
controlling for province, occupation, industry, income, and other demographic
characteristics as well as the provincial unemployment rate. Once we control for these
other influences on self-employment, we see a negative and significant coefficient
estimate for the difference-in-differences between Ontario and the control provinces over
the tax change. The probability of being self-employed in Ontario after the tax change is
0.4 percentage points lower than the difference in the control provinces over this same
period. This result is significant at the 5% level. Once again, the occupational and
industry controls are jointly significant, and higher levels of education are strongly
correlated with being self-employed. The results are reported in the second column of
Table 5.12
We repeat the analysis selecting only those individuals with some college
education or more. The results are quite similar for this group. The probability of being
self-employed in Ontario after the tax change is 0.6 percentage points lower than the
difference in the control provinces over this same period. Again, this result is significant
at the 5% level. Comparing the coefficient estimates of the 1990 tax change with those of
the 1993 tax change, the two marginal effects on the treated populations are of similar
absolute magnitude (well within each others’ confidence intervals), suggesting that the
effects of the payroll tax were offset for the respective treatment group (in this case only
18
those with college education or more) by the inclusion of self-employment earnings three
years later.
The fourth column of Table 5 reports results excluding agricultural workers from
the sample to compare to our earlier results from the 1990 tax change. Again we select
only the sample with some college education or more. The coefficient on the marginal tax
rate is negative and strongly significant, and the other coefficient estimates are quite
stable in both magnitude and significance. The two-stage estimates are reported in the
fifth column. When we instrument for the marginal tax rate, the effect of the payroll tax
remains negative and significant and is slightly larger than the single-stage results.
However, the instrumented coefficient on the marginal tax rate is no longer significant for
this sample. The t-statistic on the excluded instrument in the first stage is 19.4 and the R-
squared for the first stage is 0.61.
As an alternative control group we consider a set of U.S. states surrounding
Ontario. Using data from the Current Population Survey we construct a control group
from New York, Ohio and Michigan. While the regulatory structure of these states may
differ from Canada’s, these states have similar economies to that of Ontario. GDP growth
over the period in question was quite similar between the great lake states and Ontario
(Statistics Canada, various years and Bureau of Labor Statistics, various years). Table 6
presents results of the multivariate difference-in-differences estimates. Univariate
difference-in-differences results are not presented but are quite similar to the multivariate
results. Columns two and three present results for the 1990 tax change with and without
agricultural workers. The difference in the propensity to be self-employed increased by
1.1 percentage points in Ontario relative to the U.S. control group states. This result is in
19
the same direction as with the Canadian control group, although the magnitude is
somewhat larger. Other controls also have similar effects on the probability of being self-
employed. Married males are more likely to be self-employed, and individuals with a
college degree are more likely to be self-employed than the base category of a high
school education. Income is not a significant predictor of self-employment in this
specification. In contrast to the Canadian control group, the unemployment rate is
positively correlated with self-employment.
The fourth and fifth columns of Table 6 present results for the 1993 tax change.
Again we see a positive and significant increase in the propensity to be self-employed in
Ontario versus the U.S. control states, in this case contrary to our expectations. One
possible explanation for this is that self-employment rates were falling in the US over this
period (Schuetze, 2000) and this decline dominates any effect of the Ontario payroll tax.
6.2 Distortions Resulting from the Payroll Tax
Given the evidence suggesting that payroll taxes that differentiate between types
of income affect the decision to be self-employed, we might be concerned that there are
distortionary effects from this differential taxation. One possible consequence of such
differential taxation is that individuals may be shifting into an employment status in
which they have lower productivity. If with a payroll tax that exempts self-employment
income individuals choose to be self-employed, whereas in the absence of the tax they
choose to not to be self-employed, we might expect that some of the movement into self-
employment is an inefficient allocation of labour (see Watson (1985) for a theoretical
20
discussion of this possibility). Individuals may sort themselves efficiently in the absence
of differential taxation and make inefficient allocation decisions in the presence of
differential taxation. If this is the case, then the average returns to self-employment will
decrease as more individuals turn to self-employment.
If the above hypothesis is true then we should see a decline in the average returns
to self-employment after the introduction of the payroll tax in 1990 and an increase in the
returns to self-employment after the self-employed exemption is removed in 1993. To
test this we use a multivariate difference-in-differences estimator similar to those
specified above. Here we compare the wages of the self-employed in Ontario and the
control provinces, before and after the legislative change. We transform income using an
inverse hyperbolic sine transformation as proposed in Burbidge et al (1988)13. The results
are presented in Table 7. The second column presents results for the period surrounding
the introduction of the payroll tax in 1990. There appears to be little change in the return
to self-employment in Ontario relative to the control provinces after the introduction of
the payroll tax. However, after the self-employment exemption is dropped in 1993, we
see that the returns to self-employment rise in Ontario relative to the control provinces
(column 3).
As an alternate test for changes in the returns to self-employment we examine the
difference in wages between self-employed and non-self-employed workers in Ontario
before and after the introduction of the payroll tax. This specification addresses concerns
that there may be structural differences across provinces that affect the returns to self-
employment and that our analysis is picking up these differences and not the effects of
the tax. Here we compare only individuals in one province. Again, we would expect that
21
the returns to self-employment would decline relative to the non-self-employed after the
introduction of the payroll tax, and they would increase again as inefficient labour moves
out of self-employment three years later. Our results are consistent with this hypothesis
and are presented in Table 8. While the coefficient on the initial payroll tax change is
larger in absolute value than the coefficient on the 1993 change (about 50 percent larger)
it would appear that much of the initial decline was offset after the 1993 payroll tax
change.
The magnitude of the wage distortions suggested by these coefficients is quite
large (evaluated at the mean the change is wages is approximately $16,000 CDN). As a
result we conduct some further analyses to attempt to rule out other possible explanations
for our results. One potential concern is that the returns to self-employment are driven
primarily by past returns in the sector instead of changes in the payroll tax. To attempt to
control for this possibility we include a variable equal to the average wage in the self-
employment sector in each province for the previous year (not shown here). This
coefficient is insignificant in almost every specification and does not alter the coefficient
on the effects of changes in the payroll tax. Both specifications suggest that self-
employment income fell in Ontario relative to the control provinces after the introduction
of the tax. Again, our estimates suggest that the wage distortions were reversed upon the
inclusion of self-employed workers under the payroll tax.
A second possible explanation for the large changes in the return to self-
employment is that individuals on the margin between choosing self-employment and
salary earnings are individuals with lower average earnings. While it is not possible to
determine exactly which individuals altered their behaviour as a result of the tax, we can
22
again use education as a proxy for earnings potential and examine whether the average
educational attainment among the self-employed changed in Ontario relative to the
control provinces as a result of the payroll tax. If we were to observe that individuals with
the lowest education are also those individuals most likely to move in and out of self-
employment, this would be consistent with the marginal worker also having lower
average earnings. We perform the same empirical test as we used above with wages to
examine the difference in differences in educational attainment for self-employed
workers in Ontario relative to the control provinces before and after the change in
legislation. While we do not present the results here, we do not find a significant
coefficient on the difference in differences in educational attainment (although the
coefficient is negative), suggesting that there was no statistically significant difference in
the average educational attainment between groups as a result of the tax change. We
exploit the second change in tax legislation three years later to confirm this finding and
again find no significant difference in educational achievement between the self-
employed in Ontario relative to the control provinces. Hence, the evidence, at least when
using education as a proxy for earnings, is not consistent with the hypothesis that it is
simply individuals with lower average earnings who are moving between jobs and
causing returns to self employment to fluctuate.
As a final check on what is driving these large changes in the returns to self-
employment, we examine only those individuals with positive income. Individuals who
are self-employed are more likely to report zero or even negative income in a year than
salaried workers, and the relative decline may be disproportionately due to these
individuals. It would appear that this is indeed the case. When we restrict the sample in
23
this way and take differences over the legislative changes, the significant coefficients on
the interaction between living in Ontario post-1990 disappear, as do the significant
coefficients of the opposite sign three years later. That the result disappears once we
restrict the sample to positive income earners suggests that it is the bottom of the
distribution that is lowering the overall returns in the self-employment sector.
7. Conclusions
This paper presents evidence that payroll taxes that differentiate between types of
earnings can distort labour market decisions. Ontario’s Employer Health Tax, which
began by exempting self-employed income, is an example of such as payroll tax. Our
evidence comparing Ontario to other Canadian provinces suggests that individuals
avoided the tax by moving towards self-employment. Moreover, these movements
resulted in real wage effects with returns to self-employment falling in response to the
influx of self-employed workers. The introduction of a payroll tax ranging from one to
two percent of total payroll resulted in between a 0.6 and 1 percentage point increase in
the probability of being self-employed. Including self-employment income in the payroll
tax base offset the movement towards self-employment for the affected group almost
exactly. To give an idea of the magnitude of this change, there were approximately
308,000 self-employed workers in the year prior to the implementation of the payroll tax
(calculated using weighted SCF data). An increase of 0.6 percentage points would
represent about 30,000 workers. Using the average value of the tax per worker calculated
above of $800, this represents a tax revenue loss of $24 million (CDN). Of course, this
24
estimate only represents the average loss in payroll tax revenue and is not an estimate of
the total change in revenue due to the payroll tax. These results are robust to several
specifications and the magnitudes are consistent with previous evidence on the effects of
taxes on employment (Kesselman, 1997). Using an alternate control group of US states
we continue to find a movement into self-employment post 1990 but no movement out of
self-employment three years later. The policy implications of these findings extend
beyond the specific case examined here. Many countries, including Canada, exempt most
self-employment from payroll taxes used to fund unemployment insurance, as well as
exempting the self employed from many general payroll taxes (Kesselman, 1997).
In an attempt to measure the potential distortions which result from the tax we
examine the returns to self-employment and find a decline in the returns to self-
employment as individuals move into self-employment and a corresponding increase in
the returns to self-employment as individuals move out of self-employment. Again, the
loss in income is offset almost exactly for the affected population with the inclusion of
self-employed income in the payroll tax. The results are consistent with a model where
workers, along with their employers, adjust their labour market behavior to avoid paying
tax, which then results in workers making sub-optimal choices about becoming self-
employed.
25
* I thank Michael Baker, Dwayen Benjamin, Sherry Glied, Glenn Hubbard, Jonathan Kesselman, Michael
Smart and the editor and referees for helpful comments. All errors are my own.
1 Not only was the payroll tax not earmarked for health insurance, the tax has no bearing on an individual’s
eligibility for any health care services in Ontario. Hence we would not expect any shift outwards in labour
supply as a result of individuals valuing a benefit associated with the tax.
2 Total net self-employment income includes most business and self-employment income, and is applied to
all income whether earned in Ontario or elsewhere.
3 In 1997 the tax structure and rates were adjusted again; however, the focus on this paper is on the changes
in the tax structure between 1990 and 1996.
4 Individuals with missing information are excluded from the estimation sample. 5 Our main results are robust to the measure used for self-employment. 83% of individuals claiming self-
employment as their major source of income also claim to be self-employed.
6 If we include agricultural workers in Figure 1, the trends are similar but the gap between the test and
control provinces is larger.
7 Schuetze concludes that nation-wide increases in unemployment and average income tax rates contributed
to the rise in male self-employment over this period.
8 For the combined US-Canadian sample we use occupation and industry categories which are the lowest
common denominator across the two data sets. We do not alter the top coding of income across the
samples, but have re-estimated our regressions with and without income as a control and our results are
quite similar.
9 The unit of taxation in Canada is the individual and not the family. All taxpayers file separately although
there are deductions available for dependents with income under $5380.
10 This finding is consistent with previous research. Alternate specifications (not reported here) find that
when an interaction is included for higher income individuals marginal tax rates have a positive effect on
the probability of being self-employed for upper-income individuals and a negative effect for lower-income
individuals, in keeping with Blau (1987).
26
11 Alternatively we predict income using age, sex, education, marital status, and year dummies and then
compare individuals across provinces and over time using only those individuals whose predicted incomes
are greater than $40,000. The results do not change significantly from those presented above.
12 We repeat the analysis for men and women separately, including and excluding occupational and
industry dummies, and including and excluding linear time trends. All results are qualitatively identical
with the exception of women separately for whom the effects of the payroll tax are smaller.
13 The inverse hyperbolic sine (IHS) transformation, equal to log(y + (y2+1)1/2) is very similar to the log
transformation of income for positive income values. However, since self-employed earnings can and do
take on negative values, the IHS transformation is applied. To check the fit of the transformation we
compare coefficients using both IHS and a standard log transformation for the sample greater than zero.
The two specifications are almost identical over this range.
27
References
Abbott, M. and C. Beach. (1997). “The Impact of Employer Payroll Taxes on
Employment and Wages: Evidence for Canada, 1970-1993.” In Beach, C. et al (eds.),
Transition and Structural Change in the North American Labour Market. Kingston, On:
Queen’s University Press.
Anderson, P. and B. Meyer. (1997). “The effects of firm-Specific Taxes and Government
Mandates with an application to the U.S. Unemployment Insurance Program.” Journal of
Public Economics 65, 119-145.
Baker, M. (2002). "The Retirement Behavior of Married Couples: Evidence from the
Spouse's Allowance." Journal of Human Resources 37, 1-34.
Baker, M. and D. Benjamin. (1999). “Early Retirement Provisions and the Labor Force
Behavior of Older Men: Evidence from Canada.” Journal of Labor Economics 17, 724-
756.
Beach, C., Z. Lin and G. Picott. (1995). “The Employer Payroll Tax on Canada and Its
Effects on the Demand for Labour.” Queen’s University mimeo.
Blau, D. (1987). “A Time-Series Analysis of Self-Employment in the United States.”
Journal of Political Economy 95, 445-467.
28
Bruce, D. (2000). “Effects of the United States Tax System on Transitions Into Self-
Employment.” Labour Economics 7, 545-574.
Bureau of Labor Statistics, http://www.bls.gov .
Burbidge, J., L. Magee and A.L. Robb. (1988). “Alternative Transformations to Handle
Extreme Values of the Dependent Variable.” Journal of the American Statistical
Association 83, 123-127.
Gentry, W. and R.G. Hubbard. (2000). “Tax Policy and Entrepreneurial Entry.” American
Economics Review 90, 283-287.
Gruber, J. (1997). “The Incidence of Payroll Taxation: Evidence from Chile.” Journal of
Labour Economics 15, 72-s101.
Gruber, J. and A. Krueger. (1990). “The Incidence of Mandated Employer-Provided
Insurance: Lessons From Workers’ Compensation Insurance.” National Bureau of
Economic Research Working Paper No. 3557.
Hamermesh, D. (1993). Labor Demand, Princeton, NJ: Princeton University Press.
29
Kesselman, J.R. (1996). “Payroll Taxes in the Finance of Social Security.” Canadian
Public Policy 22, 162-179.
Kesselman, J.R. (1997). General Payroll Taxes: Economics, Politics, and Design,
Canadian Tax Foundation: Toronto, ON.
Lin, Z., G. Picot and C. Beach. (1996). “What Has Happened to Payroll Taxes in Canada
over the Last Three Decades?” Canadian Tax Journal 44, 1052-1077.
Moore, R. (1983). “Self-Employment and the Incidence of the Payroll Tax.” National
Tax Journal 36, 491-501.
Schuetze, H. (2000). “Taxes, Economic Conditions and Recent Trends in Male Self-
Employment: A Canada- U.S. Comparison.” Labour Economics 7, 507-544.
Statistics Canada, http://www.statcan.ca .
Summers, L. (1989). “Some Simple Economics of Mandated Benefits.” American
Economic Review 79, 177-183.
Treasurer of Ontario. (various years). Ontario Budget, Queen’s Printer: Toronto, ON.
30
Watson, H. (1985). “Tax Evasion and Labor Markets.” Journal of Public Economics 27,
231-246.
Wilton, D. and D. Prescott. (1996). “The Effects of Tax Increases on Negotiated Wage
Increases in the Canadian Private Sector.” Applied Economics 28, 1495-1503.
31
Table 1a
Ontario Employer Health Tax Rates—Employers 1990-1996 Range of Payroll ($) Tax Rate on Total Payroll (%) 0-200,000 0.98 200,001-230,000 1.101 230,001,260,000 1.223 260,001-290,000 1.334 290,001-320,000 1.465 320,000-350,000 1.586 350,001-380,000 1.708 380,001-400,000 1.829 400,001+ 1.95 1. Reproduced from Kesselman (1997) p.133
Table 1b Ontario Employer Health Tax, Self-Employed Individuals 1993-1996 Total Net Self-employment Income, N ($) Tax Rate (%) 0-40,000 nil 40,001-200,000 0.98 (excluding first $40,000) 200,001-400,000 0.98 on first $200,000 (excluding first
$40,000) 2.7 on next $200,000
400,001+ 1.95 (excluding first $40,000) a. Reproduced from Kesselman (1997) p.133
b. Actual taxes are then reduced by 22% because of a tax credit allowed to offset the fact
that the payroll taxes were not tax-deductible.
32
Table 2
Self-Employment Rates, 1988-1992 Income Years
Control Provinces Ontario Difference Pre 1990 0.086 0.059 -0.027 (0.001) (0.002) (0.002) Post 1990 0.086 0.068 -0.018 (0.001) (0.002) (0.002) Difference -0.001 0.009 0.010 (0.002) (0.002) (0.003)
a. Source: Survey of Consumer Finances 1988-1992.
b. Difference-in-differences in bottom right corner.
c. Tabulations are weighted using SCF weights.
d. Standard errors in parentheses.
33
Table 3
Propensity to be Self-Employed, 1988-1992 N=124589 (col 1) N=115826 (col 2-3)
self-employed Probit
self-employed Probit No agriculture
self-employed 2SLS No agriculture
Ontario * Post 1990 0.0078** 0.0085** 0.014** (0.0033) (0.0028) (0.0049) Year=1989 0.0014 0.00081 0.0011 (0.00086) (0.00071) (0.0013) Year=1991 0.0012 0.0016 0.0029 (0.0020) (0.0012) (0.0026) Year=1992 0.00072 0.0023 0.0053** (0.0029) (0.0015) (0.0023) Nova Scotia -0.00077 -0.0015 -0.0025 (0.0054) (0.0032) (0.0066) New Brunswick -0.0060** -0.0043** -0.0083** (0.0013) (0.00060) (0.0014) PEI -0.0035 -0.0040** -0.0062** (0.0022) (0.0012) (0.0026) Ontario -0.0096** -0.012** -0.017** (0.0040) (0.0029) (0.0050) Saskatchewan 0.0059** 0.0028* 0.0051 (0.0020) (0.0016) (0.0043) Alberta -0.0068** -0.0080** -0.014** (0.0021) (0.0017) (0.0026) Income 1.15E-7* 1.01 E-7 -1.13E-7 (6.73E-8) 6.64 E-8 2.97E-8 Married 0.018** 0.015** 0.023** (0.00082) (0.00068) (0.0013) Male 0.017** 0.016** 0.025** (0.0013) (0.0011) (0.0026) Education: 9-10 0.0030** 0.00093 0.00097 (0.00069) (0.00076) (0.0020) Education:11-13 0.0010 -0.0010 -0.00052 (0.0016) (0.0012) (0.0036) Some post secondary 0.0021 0.00079 0.0051 (0.0036) (0.0033) (0.0064) Post Secondary Certificate 0.0086** 0.0065** 0.013** (0.0020) (0.0022) (0.0053) University degree 0.018** 0.015** 0.030** (0.0024) (0.0016) (0.0040) Marginal tax rate -0.00087** -0.00086** -0.00092** (0.00008) (0.00005) (0.00037) Unemployment Rate -0.00039 -0.00089 -0.0017 (0.00098) (0.00064) (0.0013) Age 0.00078** 0.00085** 0.0017** (0.00007) (0.00001) (0.00008) Constant -0.182** -0.163** -0.036 (0.016) (0.016) (0.023) 1st stage t-stat on instrument 40.39 Source: Survey of Consumer Finances, 1988-1992.
a. Standard errors in parentheses
34
b. All specifications include occupation and industry dummy variables. Sample includes all workers unless
otherwise stated.
c. Results for probits presented as marginal effects.
d. ** denotes significance at the 5% level, * denotes 10% level.
e. Weighted using SCF weights.
f. Standard errors are robust and cluster corrected at the province level.
g. Column 3 instruments for the individual’s marginal tax rate using changes in provincial income tax rates
for an individual with fixed income.
35
Table 4a Self-Employment Rates, 1991-1996 Income Years Control Provinces Ontario Difference Pre 1993 0.086 0.068 -0.018 (0.001) (0.002) (0.002) Post 1993 0.100 0.077 -0.023 (0.001) (0.001) (0.002) Difference 0.014 0.009 -0.005 (0.002) (0.002) (0.003)
a. Source: Survey of Consumer Finances 1991-1996.
b. Difference-in-differences in bottom right corner.
c. Weighted using SCF weights.
d. Standard errors in parentheses.
Table 4b Self-Employment Rates, 1991-1996 Income Years Individuals with Predicted Income of > $40,000 Control Provinces Ontario Difference Pre 1993 0.075 0.068 -0.008 (0.002) (0.002) (0.003) Post 1993 0.091 0.079 -0.012 (0.002) (0.002) (0.003) Difference 0.016 0.011 -0.005 (0.003) (0.003) (0.004)
a. Source: Survey of Consumer Finances 1991-1996.
b. Difference-in-differences in bottom right corner.
c. Weighted using SCF weights.
d. Standard errors in parentheses.
36
Table 5 Propensity to be Self-Employed 1991-1996 N=143391 (Col 1) N=78257 (Col 2) N=75594 (Col 3-4)
self-employed- all individuals Probit
self-employed –individuals with some college education or more only Probit
self-employed –individuals with some college education or more only Probit – No agriculture
self-employed –individuals with some college education or more only 2SLS – No agriculture
Ontario * post 1993 -0.0043** -0.0059** -0.0052** -0.0084** (0.00087) (0.0012) (0.0013) (0.0018) Year=1991 -0.0076** -0.0065** -0.0055** -0.0012 (0.0025) (0.0012) (0.0014) (0.0019) Year=1994 -0.0087** -0.0060** -0.0039** 0.0025 (0.0027) (0.0012) (0.0015) (0.0021) Year=1995 -0.0065** -0.0057** -0.0048** 0.012** (0.0028) (0.0018) (0.0018) (0.0029) Year=1996 0.00053 -0.00051 -0.00010 0.0091** (0.0018) (0.0011) (0.0012) (0.0025) Nova Scotia -0.0058 0.0090 0.012 0.0057 (0.011) (0.0074) (0.0083) (0.016) New Brunswick -0.011** -0.00097 0.0010 -0.0048 (0.0050) (0.0034) (0.0039) (0.0071) PEI -0.0086** -0.0012 0.00049 -0.0022 (0.0044) (0.0030) (0.0035) (0.0062) Ontario -0.0039** 0.00073 0.00034 0.0025* (0.00055) (0.00080) (0.00079) (0.0013) Saskatchewan 0.0044 -0.0020 -0.0042 -0.0057 (0.0044) (0.0035) (0.0029) (0.0058) Alberta -0.0076** -0.012** -0.013** -0.016** (0.0023) (0.0019) (0.0018) (0.0030) Income 1.35E-7 1.70E-7 1.64 E-7 -5.0E-7 (1.11E-7) (1.15E-7) (1.04E-7) (4.11E-7) Married 0.019** 0.014** 0.012** 0.017** (0.0027) (0.0022) (0.0017) (0.0022) Male 0.019** 0.017** 0.015** 0.021** (0.0017) (0.0015) (0.0014) (0.0030) Grade 9 or 10 0.0034* --- --- --- (0.0020) High school 0.0012 --- --- --- (0.0029) Some College 0.0011 --- --- --- (0.0026) Post Secondary Certificate
0.0077** 0.0065** 0.0059** 0.0053**
(0.0022) (0.0016) (0.0017) (0.0024) University degree 0.018** 0.016** 0.015** 0.022** (0.0020) (0.0028) (0.0032) (0.0044) Marginal Tax Rate -0.0011** -0.0012** -0.0011** 0.00018 (0.00010) (0.00008) (0.00004) (0.00055) Unemployment Rate 0.00027 -0.0024** -0.0029** -0.0029 (0.0016) (0.0011) (0.0012) (0.0022) Age 0.00099** 0.0011** 0.0011** 0.0022** (0.00010) (0.00006) (0.00005) (0.00013) Constant -0.200** -0.202** -0.198** -0.089** (0.015) (0.032) (0.034) (0.044)
37
1st stage t-stat on instrument
19.36
Source: 1992 -1996 Survey of Consumer Finances
a. Standard errors in parentheses.
b. All specifications include occupation and industry dummy variables. Sample includes all workers unless
otherwise stated.
c. Results for probits presented as marginal effects.
d. ** denotes significance at the 5% level, * denotes 10% level.
e. Weighted using SCF weights.
f. Standard errors are robust and cluster corrected at the province level.
g. Columns 3-5 include only those individuals with more than a high school education as a proxy for
income greater than $40000. Column 5 instruments for the individual’s marginal tax rate using changes in
provincial income tax rates for an individual with fixed income.
38
Table 6 Propensity to be Self-Employed U.S. Control Group 1990 change 1993 change N=88565, 86173, 61505, 60366.
self-employed
self-employed No agriculture
self-employed (education level = some college or greater)
Self-employed (education level = some college or greater) No agriculture
Ontario* post 1990 0.011** 0.011** --- --- (0.0046) (0.0042) Ontario* post 1993 --- --- 0.015** 0.015** (0.0068) (0.0070) Ohio -0.0040** -0.0041** -0.0076** -0.0074** (0.00059) (0.00050) (0.0024) (0.0027) Michigan -0.0082** -0.0081** -0.010** -0.0092** (0.0026) (0.0023) (0.00048) (0.00064) Ontario -0.038** -0.036** -0.026** -0.024** (0.0060) (0.0054) (0.0058) (0.0057) Income -3.32E-8 -3.79E-8 -1.60E-7** -1.47E-7** (8.51E-8) (8.40E-8) (5.28E-8) 5.04E-8 Married 0.022** 0.019** 0.021** 0.018** (0.0044) (0.0036) (0.0010) (0.00086) Male 0.019** 0.018** 0.018** 0.017** (0.0010) (0.00097) (0.0013) (0.0013) Education: elementary
0.00058 0.0023 --- ---
(0.0022) (0.0023) Education: grades 9 or 10
0.0022 0.0035 --- ---
(0.0045) (0.0038) Education: some college
0.0077** 0.0078** --- ---
(0.0032) (0.0029) Education: College degree
0.021** 0.020** -0.013** -0.013**
(0.0057) (0.0050) (0.0028) (0.0025) Unemployment Rate 0.0061** 0.0055** 0.0033 0.0031 (0.0015) (0.0014) (0.0024) (0.0025) Age 0.0014** 0.0014** 0.0015** 0.0015** (0.00021) (0.00014) (0.00022) (0.00017) Constant -0.185** -0.180** -0.182** -0.182** (0.030) (0.032) (0.026) (0.031) a. Source: 1988-1996 Survey of Consumer Finances and 1988-1996 Current Population Survey
b. All specifications include occupation, industry, and year dummy variables. Sample includes all workers
unless otherwise stated.
c. Standard errors are in parentheses and are cluster corrected at the province/state level.
d. Results presented as marginal effects
e. ** denotes significance at the 5% level, * denotes 10% level.
39
f. Columns 2 and 3 report coefficients from examining the 1990 legislative change (using data from 1988-
1992) and columns 4 and 5 report coefficients for the 1993 legislative change (using data from 1991-1996).
g. Control Group includes New York, Michigan and Ohio.
h. Columns 4-5 include only those individuals with more than a high school education as a proxy for
income greater than $40000.
40
Table 7 Incidence of the Payroll Tax on Self-Employed Income (y) 1990 and 1993 Payroll Tax Changes Self-Employed in Ontario Versus Self-Employed in Control Provinces N=7170, 9440 log(y + (y2+1)0.5) log(y + (y2+1)0.5) Ontario*post 1990 change -0.00030 --- (0.154) Ontario*post 1993 change --- 0.517** (0.082) Education: 9-10 -0.068 -0.182 (0.165) (0.113) Education:11-13 -0.0041 -0.095 (0.070) (0.103) Some post secondary -0.011 0.103 (0.074) (0.066) Post Secondary Certificate 0.116 -0.0018 (0.100) (0.105) University degree 0.418** 0.491** (0.040) (0.124) Married 0.223** 0.044 (0.077) (0.122) Male 0.670** 0.515** (0.148) (0.065) Hours Worked 0.010** 0.014** (0.0037) (0.0034) Weeks Worked 0.025** 0.025** (0.0029) (0.0030) Unemployment Rate -0.104** -0.061 (0.037) (0.119) Age 0.012** 0.0071** (0.0012) (0.0014) Constant 9.14** 9.11** (0.471) (1.25) a. Source: 1988-1996 SCF
b. Year, provincial, industry, and occupational dummies included in all specifications.
c. ** denotes significance at the 5% level, * denotes 10% level.
d. Column 2 reports coefficients from examining the 1990 legislative change (using data from 1988-1992)
and column 3 reports coefficients for the 1993 legislative change (using data from 1991-1996).
e. Standard errors are in parentheses and are cluster corrected at the province level.
f. Sample includes self employed workers only, excluding agricultural workers.
41
Table 8 Incidence of the Payroll Tax on Self-Employed Income (y) 1990 and 1993 Payroll Tax Changes Self-Employed in Ontario Versus Non Self-Employed in Ontario
N=47076, 60616 log(y + (y2+1)0.5) log(y + (y2+1)0.5) Self-Employed*post 1990 change -0.615** --- (0.168) Self-Employed*post 1993 change --- 0.389** (0.155) Self-Employed -0.486** -1.09** (0.094) (0.141) Education: 9-10 -0.025 -0.014 (0.040) (0.044) Education:11-13 0.181** 0.179** (0.035) (0.037) Some post secondary 0.278** 0.289** (0.040) (0.040) Post Secondary Certificate 0.316** 0.328** (0.036) (0.037) University degree 0.477** 0.499** (0.044) (0.042) Married 0.083** 0.084** (0.019) (0.016) Male 0.277** 0.240** (0.020) (0.016) Hours Worked 0.021** 0.022** (0.001) (0.00074) Weeks Worked 0.048** 0.045** (0.0017) (0.0014) Unemployment Rate 0.024** 0.0059 (0.004) (0.020) Age 0.016** 0.017** (0.001) (0.00065) Constant 6.221** 6.576** (0.146) (0.238) a. Source: 1988-1996 SCF
b. Year, industry, and occupational dummies included in all specifications.
c. ** denotes significance at the 5% level, * denotes 10% level.
d. Column 2 reports coefficients from examining the 1990 legislative change (using data from 1988-1992)
and column 3 reports coefficients for the 1993 legislative change (using data from 1991-1996).
e. Sample includes all workers in Ontario only, excluding agricultural workers.
f. Standard errors are in parentheses and are cluster corrected at the province level.
42
Figure 1:
The Rate of Self-employment—1988-1996, excluding agricultural workers.
year
ontario control provinces
1988 1990 1992 1994 1996
.05
.06
.07
.08
.09
a. Source: SCF 1988-1996.
b. Control provinces include all provinces except Ontario, Newfoundland, Quebec and
Manitoba.
c. Individuals are categorized as self-employed if they claim self-employment as their
major source of income. Individuals working in the agricultural sector are excluded.
43
Appendix A: Means in Ontario and Control Provinces in Base Year (1988)
Variable Ontario Control
Provinces
Percent Male 0.55 0.56
Age 36.58 36.43
Percent Married 0.65 0.67
Education Level (grouped in 6 levels) 3.65 3.66
Total Income ($) 32668.48 24243.67
Hours Worked per Week 37.40 37.41
Percent in 11 Major Occupation Categories: MANAGERIAL AND ADMINISTRATIVE
13.43 12.70
NATURAL SCIENCES,ENGINEERING,MATH 12.37 12.67
TEACHING 4.36 4.82
CLERICAL 16.88 15.73
SALES 9.92 9.59
SERVICES 12.51 14.52
FARMING,HORTICULTURAL AND ANIMAL HUSBANDRY
2.14 6.10
MINING,QUARRYING,PROCESSING,MACHINING 5.95 5.24
PRODUCT FABRICATING, ASSEMBLING, REPAIRING
9.80 5.63
CONSTRUCTION TRADES 5.38 5.75
TRANSPORT EQUIPMENT OPERATION, MATERIAL HANDLING
7.27 7.27
a. Sample includes workers only.
b. Means are weighted using SCF population weights.
c. Source: SCF, 1988.
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Appendix B: First Stage Results from Instrumenting for Individual Marginal Tax Rates. N=124589 Marginal Tax Rate Change in marginal tax rate 0.519** (0.013) Ontario* Post 1990 1.96** (0.427) Year=1989 15.5** (0.181) Year=1991 15.4** (0.230) Year=1992 15.9** (0.282) Nova Scotia 0.157 (0.572) New Brunswick 0.568** (0.182) PEI 0.825** (0.287) Ontario -2.00** (0.456) Saskatchewan 1.19** (0.211) Alberta -0.464** (0.159) Income 0.00033** (0.00002) Married 0.957** (0.125) Male 0.439** (0.212) Education: 9-10 -1.12** (0.129) Education:11-13 0.509** (0.153) Some post secondary 0.465** (0.163) Post Secondary Certificate 1.27** (0.045) University degree 0.581** (0.092) Unemployment Rate 0.046 (0.094) Age 0.095** (0.0028) Constant 0.853 (0.698) R-squared 0.662 (0.092) a. Source: 1988-1992 SCF b. Occupational and industry dummies included. c. ** denotes significance at the 5% level, * denotes 10%
level. d. The excluded instrument is the change in marginal tax rate for an individual with fixed income using changes in provincial
income tax rates over time. e. Standard errors are in parentheses and are cluster corrected at the province level. f. Sample includes all
workers.
