- Original article
- Open Access
Fiscal policies and the prices of labor: a comparison of the U.K. and U.S.
© Mulligan. 2015
- Received: 18 March 2015
- Accepted: 22 August 2015
- Published: 10 December 2015
This paper measures the 2007–13 evolution of employment tax rates in the U.K. and the U.S. The U.S. changes are greater, in the direction of taxing a greater fraction of the value created by employment, and primarily achieved with new implicit tax rates. Even though both countries implemented a temporary “fiscal stimulus,” their tax rate dynamics were different: the U.S. stimulus increased rates, whereas the U.K. stimulus reduced them. The U.K. later increased the tax on employment during its “austerity” period. Tax rate measurements are a first ingredient for cross-country comparisons of labor markets during and after the financial crisis.
- Marginal tax rates
- International comparisons
Many countries of the world experienced an unusually deep and long recession after 2007. Over the same time frame, several facets of fiscal policy were changed, especially policies related to taxation and safety net programs. The purpose of this paper is to compare changes in fiscal policy parameters as they affected the incentives of middle-class Americans and British to be employed. The U.K. had a “stimulus programme” followed by an “austerity programme.” The U.S. federal government also passed what it called a “stimulus package,” followed by a major health reform.
Policy labels acquired during legislative processes are not necessarily indicative of economic fundamentals. This paper comparably quantifies fiscal policy in terms of one of the fundamentals: the wedge between the supply price of labor and the demand price of labor. It finds that the two countries have been different in terms of the evolution of employment taxation, on average and across demographic groups. The American stimulus reduced average incentives to be employed by increasing cash and health benefits for the unemployed and for families with low incomes, whereas the British stimulus did the opposite by temporarily reducing its value-added tax rate and permanently reducing its basic income tax rate. The British austerity program pushed incentives in the opposite direction as its stimulus by permanently increasing its payroll and value-added tax rates.
Taxes potentially affect work decisions in a variety of dimensions, for example: the number of weeks worked per year, the number of hours worked per week, whether to work at all during a year, and the amount of effort to put into work. Due to the prominence of the business cycle during this period and the sheer size of gross monthly employment flows, this paper focuses on the weeks-per-year margin, holding constant weekly hours and the probability of not working at all during a calendar year. In the 21stcentury U.K., for example, the single largest quarterly employment decline for the non-elderly population has so far been 0.3 million, as compared to at least 2.6 million non-elderly people who join or separate from an employer during the average quarter.2 Adding just one week out of work before joining, or after separating, would therefore create a remarkable net reduction in the number employed at a point in time. Also, the large majority of unemployment spells last less than 12 months, and some of those lasting 12 months do not blanket an entire tax year.3
I follow the usual steps of public finance analysis and first look at the tax wedge — the gap between supply and demand prices created by a tax or subsidy. The next step, left for future research, is to draw conclusions about the wedge’s behavioral effects and ultimate incidence. Thus, with one exception noted below, the estimates in this paper do not require any assumption about the relative incidence of labor taxes on employers and employees.
Section 1 discusses the United Kingdom, demonstrating how many of the tax changes were ultimately offsetting in terms of the employment incentives they created. The primary exception relates to the subpopulation receiving child tax credits, because the phaseout (sometimes referred to as “taper”) rate of those credits increased with little change in the range of incomes over which the phaseout applies. Section 2 shows results for the United States, where employment disincentives have increased over time, especially (but not exclusively) among unmarried workers. Section 3 shows the evolution of the employer cost and employee benefit from work – the gap between the two is the employment tax wedge – by country for workers in the middle of the wage distribution.
2.1 A worker’s tax year budget constraint
where τ f denotes the marginal employer NICs rate and ST < y denotes the earnings threshold for weekly employer NICs.
The consumption tax rate is assumed to be constant across workers, but UB varies across workers due to family composition and housing expenses.
As indicated in equations (1) and (2), a fixed amount of earnings — the “primary” and “secondary” thresholds (PT and ST, respectively) — can be earned without any NICs owed by employee or employer.9 The NICs system is therefore equivalent to a truly flat-rate payroll tax (specifically, without any PT or ST) plus a refund of a fixed amount to each employee and employer equal to the flat-rate tax that accrued on the first PT (or ST) of earnings. Equation (3) separates the “flat-rate” component from the PT-ST-refund component, with the former represented by the y i terms and the latter by the ratio with PT and ST in the numerator.
The U.K. personal income tax is a function of personal income above the “personal allowance.” There are multiple tax brackets, some of which are created by the phaseout of the personal allowance. All of these are represented by my PIT notation.
Unlike U.S. Social Security contributions, the NICs thresholds and rates are administered each pay period (e.g., weekly) without regard for earnings accumulated so far during the tax year. As a result, equation (3)’s PT and ST terms enter the budget constraint in the same way that the UB term does, except with the opposite sign. In effect, the PT-ST-refund component of my two-part representation of the NICs is, by itself, a weekly employment subsidy.
where τ i denotes worker i’s PIT bracket. The PIT brackets vary across workers according to the amount they earn for the year, although a majority of workers are in the “basic rate” bracket of 20 or 22 percent (depending on the year) plus, for some of the basic-rate workers, a phaseout of tax credits.11
Equation (4) has a consumption-tax term multiplying the UB, PT, and ST terms (as well as the others), thereby giving the impression that a consumption tax increase would reduce the contribution of the UB, PT, and ST terms to the tax wedge. However, because jobless allowances and the NICs thresholds are automatically indexed to consumer-price inflation, and employer cost y is not, the contribution of these two terms to the wedge is independent of the consumption tax as long as the consumption tax is passed through one-for-one into consumer prices.12 To put it another way, the consumption tax rate is expected to increase each ratio UB/y, PT/y, and ST/y in the same proportion that it reduces the ratio 1/(1 + τ c ).
2.2 Legislative changes since 2007: wage income tax brackets
Each of equation (4)’s statutory parameters changed after 2007. Moreover, real employer costs y were changing relative to the sterling-denominated and inflation-adjusted statutory parameters such as the jobless allowance and the PT. As I show below, many of the parameter changes are offsetting — perhaps by design — in terms of their effects on the employment tax wedge q. Because of the various offsets, the VAT (value-added tax) and tax credit changes ultimately drive most of the changes in the tax wedge.
Beginning at 17.5 percent, the standard VAT rate was temporarily cut to 15.0 percent for the last month of 2008 and the entire calendar year of 2009.13 It was 17.5 percent again in 2010. On January 4, 2011, the rate was permanently increased to 20 percent where it is now. The UK VAT increases are especially interesting for the purposes of labor market analysis because a VAT reduces the purchasing power of wages without reducing the purchasing power of jobless benefits because the latter are indexed to the consumer price index (CPI).
The UK made several adjustments to its personal income tax on earnings, which has been a three or four-bracket system (plus implicit brackets for the phaseouts of tax credits and the personal allowance). Effective April 2008, the bottom two non-zero brackets of 10 percent and 22 percent were combined into a single 20 percent bracket, as it is today. Effective April 2010, the personal allowance was phased out beginning at £100,000, and the upper bracket of 40 percent was split in two brackets: 40 percent and 50 percent. A year later, the income threshold separating the 20 and 40 percent bracket was cut by three percent in nominal terms (seven percent in real terms), thereby creating a group of taxpayers who experienced a twenty percentage point increase in their bracket. The 50 percent bracket rate was cut to 45 percent effective April 2013.14
One result of the ongoing threshold changes is that the 2010 and 2011 cuts to the real-income threshold between the 20 and 40-percent PIT brackets only increased overall marginal rates by about 10 percentage points for taxpayers with incomes between the old and new thresholds because much of their 20-point PIT marginal rate increase was offset by being moved into a lesser marginal NICs rate.
Effective April 2011, one percentage point was added to both the employer NICs and the employee NICs (HM Revenue and Customs 2014a). For the workers (they are a majority of taxpayers and have annual employer cost between £7,000 and £43,000) that would have been in the 22 percent personal income bracket under 2007 law, the additions to the marginal NICs rate almost exactly offset the 2-percentage point PIT cut after 2007. As a result, the solid-blue and black-dotted schedules almost coincide in that range, with the blue 2011 schedule located just 0.4 percentage points below the 2007 schedule.
Among the relatively few high-income taxpayers, the combined contribution of the PIT and NICs changes has been to increase the employment tax wedge. The contribution of these PIT and NICs changes to the overall average employment tax wedge is essentially zero.
In order to highlight the harmonization of the PIT and NICs brackets, Fig. 2 excludes the phaseout of “tax credits.” Two main tax credits are paid to households: working tax credits (WTCs) and child tax credits (CTCs). Both credits are a function of annual household income and prorated according to the beneficiary’s payment period (weekly or every four weeks).18 In 2014, the full credits apply for annual household incomes between £0 and £6,420 (HM Treasury 2013). The WTC is phased out between £6,420 and about £18,000, depending on household circumstances, and at the same rate as the CTCs. Without beginning to count spousal income or income from job seekers allowances, someone earning the median wage in a full-time full-year job (hereafter “the median”) would earn about £23,000 and therefore not receive any WTC on the weekly employment margin (4) unless he was out of work much of the year and did not have significant income from other sources.19 For this reason, this paper gives more attention to the CTCs, which are phased out above annual household income of £18,000 (or so, depending on circumstances) until about £26,000 for one child and £33,000 for two children.20
In summary, VAT rates, NICs parameters, personal income tax rules, and tax credit rules all changed after 2007. The next step is to use equation (4) to determine the direction and quantitative importance of the changes for incentives to be employed.
2.3 Changes since 2007: overall employment tax rates
Implicit Employment Taxes from NICs and the JSA, 2010 and 2011
% of earnings above ST or PT
Tax value of PT and ST
2010 British pounds per week
Job Seekers Allowance (tax adjusted)
2010 British pounds per week
JSA minus Tax value of PT and ST
2010 British pounds per week
Percentage of employer cost, FW
Percentage of employer cost, VW
Basic rate for the PIT
Percentage of taxable income
2010 British pounds per 40-hour week, at the median wage
The top three rows are the NICs parameters. Both employer and employee rates increased between 2010 and 2011, which made each pound of primary and secondary threshold more valuable. Moreover, the two thresholds were increased by more than £25 per week. As shown in the table’s third row, the combination of these changes resulted in a 5.9-pound increase in the value (in terms of tax savings) of the primary threshold between 2010 and 2011, adjusted for inflation.
The next row is the job seekers allowance (JSA). Adjusted for inflation, it fell about one pound. The difference between the fourth and third rows is the net implicit weekly employment tax created by the JSA and NICs, holding annual income constant. It fell about seven pounds per week, adjusted for inflation. Both the JSA and ST values are adjusted for personal income taxes as specified by equation (4).
As with any employment tax, the economic importance of the employment taxes shown in Table 1 depends on their magnitudes relative to the value created by a week of work, which I measure as employer cost for a 40-h week at the median of the hourly wage distribution for full-time workers.22 The next two rows in the Table therefore express the employment taxes as a percentage of the 2010–11 average employer cost. By this measure of change, which is entirely a function of the inflation-adjusted statutory parameters, employment tax rates fell more than one percentage point between 2010 and 2011.
Real wages and real employer cost were falling during this period, which means that each pound of implicit employment tax became economically more important over time. I account for this change by using the variable-weight measures shown in the final row of the table, which use year-specific employer cost for the ratios PT/y and UB/y. By comparison with the previous row, we see that falling real employer cost partly, but not fully, offsets the contribution of the growing value of the NICs thresholds to the weekly employment tax.
As with the other tax calculations in this paper, Fig. 4 does not include housing allowances for the unemployed. The changes over time would be the same if housing allowances had been included and stayed in a fixed proportion with the weekly employer cost of the median worker. See Adam and Browne (2013) for discussion of housing allowance policy changes and Appendix II for list of tax and benefit programs that are included in this paper’s calculations.
Tax and benefit programs included the rate calculations
Payroll taxes (employer and employee)
National Insurance Contributions
Old Age, Survivors, Disability, Medicare
Personal Income Taxes
Ordinary federal tax (without credits)a
Ordinary state tax (without credits)a
Exclusion of UI from taxable income
Unemployment Insurance (UI)
Federal Additional Compensation
Family/Safety Net Benefits
Working Tax Credit
Food stamps (SNAP)
Child Tax Credit
Among those with credits fully phased out (dashed series in Fig. 5), the changes are essentially the same for low- and high-wage workers. The dashed series end in 2013 about where they began because the consumption tax increase (driven by the VAT change) tends to offset the combined reduction represented as the sum of Fig. 4’s three series. The low-wage dashed series finished slightly above the high-wage series because the £5 weekly reduction in the tax value of (JSA − tax value of PT and ST) is a somewhat greater percentage of employer cost for low-wage employees. Both series have a temporary increase in 2008 and 2009 because of the temporary VAT cut and because the PIT’s basic rate cut was sudden, and sooner, compared with the changes in employer cost and the higher NICs rates that would come later.
The solid series shows incentive changes for “on-credits” individuals with a decision to work one week more (or less) during the year that affects the amount of their child tax credit. Specifically, on-credits individuals receive a credit if they work more, but less credit than they would receive if working less. For them, the reward to working falls significantly because the benefit reduction rate after 2010 was four points greater than it was in 2007 when their after-tax share was already as low as 20 percent. The increase in 2008 and 2009 is less than it is for those “off credits” because the benefit reduction rate increase in 2008 was offsetting the contemporaneous cut in the basic rate. Lesser employment disincentives emerge for low-wage workers because the combined value of the NICs thresholds is a nontrivial incentive for them to work and this value increased after 2007 (recall Fig. 4’s green PT/ST series).
As shown in Fig. 3, the threshold for CTCs did not change in exact proportions with the median wage, which means that even a worker whose wage tracked the median might receive credits in later years but not in earlier years, or vice versa. Figure 5 omits such workers, but their incentive changes would be massive because equation (4) evaluated without credit phaseout is about 55 percent whereas the value with credit phaseout exceeds 80 percent. These two situations are relatively rare, though, because the thresholds did not change much relative to the median wage.
Although payroll taxes, sales taxes, and personal income taxes do not combine the income of spouses in order to determine the rate that applies, tax credits do. This by itself tends to increase the likelihood of unmarried workers to be on credits. However, because cohabiting unmarried persons are treated as married for tax credit purposes, and couples are more likely to have children, single workers are not more likely to be on credits. For example, in the tax year beginning April 2011, workers claiming tax credits as singles were only 23 percent of all adults in working families with credits (HM Revenue and Customs 2013a, Table 2.1, counting husband and wife separately). By comparison, 42 percent of adults in the U.K. were neither married nor cohabiting.27
2.4 Comparison with previous studies
Adam and Browne (2013) also look at changes in work incentives between 2010 and (their forecast for) 2015. Our studies have two major differences — the baseline against which policies are compared and the types of individuals considered — as well as a more subtle difference in the type of incentive(s) that we measure. On the first point, both their paper and mine note that “earnings have increased less quickly than benefit rates, which tends to make working less attractive” (Adam and Browne (2013), p. 1). Equivalently, benefit rates have increased more than wage rates: is that a policy change or not? This is merely a question of definition, and I refer to any change in benefit rates relative to wages as a policy change even if prior law would have it that way. Moreover, because benefit rates have increased relative to wages but decreased relative to the Retail Price Index (RPI, which prior law had used for indexing benefits), policy reduced the reward to work by my definition (ignoring the other statutory changes noted above).
The second difference from Adam and Browne (2013) is that my sample excludes persons not working at all during the year, whereas Adam and Browne’s include them. The difference is important because “The majority of the welfare reforms involve changing the maximum amount of means-tested support that can be received by those with no other income” (Adam and Browne (2013), p. 10). Persons not working at all during a tax year may not be close to the margin for working in the short run and are thereby less interesting for short-run behavioral analysis, although excluding them altogether (as I do) errs in the opposite direction.28 I look at a variety of skill levels, but, unlike Adam and Browne, not deviations from the median wage that are so large that some of the workers are still receiving working tax credits.
The reward to working an additional week examined in this paper has a lot in common with the reward to earning more per week, which Adam and Browne (2013) call the EMTR, except that the latter does not reflect foregone unemployment benefits or the value of the NICs’ thresholds. As a result, they find the EMTR to be essentially constant after 2010, whereas my reward measure falls somewhat, in part because of the contribution of foregone unemployment benefits.29
Because the labor market features a rich variety of circumstances and alternative work situations, all of the tax rate measures are relevant for behavioral analysis. The additional-week measure deserves some attention for the purpose of understanding employee and employer decisions of how long to maintain a job or to endure a period of joblessness, which are decisions that are relevant for business cycle purposes. My paper is also unique in its display of year-to-year tax-wedge dynamics after 2007.
The overall level of disincentives is not a focus of this paper or Adam and Browne’s. I report comparatively higher levels (80+ percent is not uncommon) because of my focus on the weekly employment margin (e.g., including JSA as an implicit tax) and perhaps because of my treatment of indirect taxes. Appendix I details my measurement of, and economic assumptions about, various indirect taxes.
The U.S. and the U.K. have broadly similar policy types affecting the reward to work: payroll taxes, personal income taxes, consumption taxes, unemployment benefits, and safety net program benefits (recall Table 2). But they differ in terms of administrative details. The U.S. payroll tax, alternately known as “Social Security contributions” or “old age, survivors, disability, and hospital insurance contributions,” is administered on a calendar-year basis — as compared to weekly (or pay period) in the U.K. — and has no analogue to the primary and secondary thresholds. The U.S. personal income tax is also administered on a calendar-year basis, and has a bracket structure broadly similar to the U.K.’s, including an annual amount that can be earned free from personal income tax.
The U.S. personal income tax includes an “Earned Income Tax Credit” (EITC) that roughly resembles the U.K.’s Working and Child Tax Credits.30 In both countries, working full-time full-year at or near the median wage would still qualify a person for a partial credit, at least if she had two qualifying children. The EITC is phased out at 7.7 percent for those without children, 16.0 percent for one-child, 21.1 percent for more than one child, as compared to 41 percent for the U.K. tax credits (Tax Policy Center 2014, rounded to the nearest tenth of a percentage point). Unlike the U.K. credit phase-out rate, the EITC phase-out rates did not change after 2007. The EITC phase-out ranges were little changed (see Mulligan 2012 for more discussion of temporary changes to EITC amounts and thresholds). Other safety net programs such as Supplemental Security Income and TANF affect tax-wedge levels, but not tax-wedge changes, because the programs did not have significant changes in their eligibility or benefit rules. For these reasons, the estimates here of the changes in U.S. work incentives after 2007 consider only food stamps, UI and related programs, health insurance assistance and the payroll tax (more on these below).
The U.S. unemployment insurance (UI) program offers weekly cash benefits to people who have lost their jobs and have as yet been unable to start a new one. The benefits expire after six months, even if the claimant continues to be out of work, although the time of expiration has been extended during recessions, especially the most recent one. Because UI is contingent on employment status, it is implicitly an employment tax, as it is in the U.K. The U.S. cash-benefit system has, at times, included additional kinds of assistance, as noted below.
The governments in both countries spend on healthcare, but in the U.S. the assistance creates disincentives because it is income and/or employment tested. Prior to 2014, the bulk of this assistance for nonelderly people came from the Medicaid program, which is jointly administered by state and federal governments. In this paper’s study of incentives 2007–13, Medicaid is treated as a tax on income (and thereby employment) that is constant over time and disproportionately applicable to unmarried and low-income people.
The Department of Agriculture’s food stamp program, now known as Supplemental Nutrition Assistance (SNAP), provides funds to low-income households for the purpose of buying food. SNAP benefits are potentially available to households earning less than 130 percent of the prior year poverty line, which is adjusted every fiscal year according to the rate of inflation.31 Traditionally, food stamps were also denied to households based on asset ownership, and the program required states to ensure that a sufficient fraction of the able-bodied adult participants were employed.
With the exception of a partial payroll tax holiday in 2011 and 2012, few American taxpayers saw a significant change in the personal income or payroll tax rules during the years 2007–13. But several safety net benefit rules were changed after 2007 in ways that created new implicit taxes on earnings and employment. Most of those rule changes related to unemployment insurance and SNAP.
A variety of legislation after 2007 temporarily and significantly added to the weekly amount of benefits and the duration of time that they could be received, and thereby temporarily increased the tax wedge on employment.32 New legislation also made it easier to claim benefits. Before the recession, the amount of the UI benefit was about half of the amount earned on the prior job, up to a state-specific cap amount that tends to be about 60 percent of the median wage. Although the benefit amounts prior to the recession tended to be proportional to earnings on the job held before the unemployment spell, the temporary benefit additions were either fixed weekly dollar amount or a fixed amount of in-kind assistance. Thus, with respect to the employment tax wedge equation (4), the UI benefit rule changes have a lot in common with an increase in the UB term, which tends to be more significant for low-skill workers (they have a lesser value for employer cost y). The benefit-duration and other eligibility changes look more like an increase in UB that is proportional to y, at least for unemployed persons receiving less than the benefit cap.
A variety of legislation in and around the recession effectively eliminated some of the long-standing barriers to SNAP eligibility and participation, leaving primarily the household income test. The time interval for the income test is not required to be the calendar year, which means that now many workers who are not poor or near poor while they are employed can qualify for food stamps during periods that they are out of work. In this regard, the food stamp rule changes have a lot in common with an increase in equation (4)’s UB term. As such, the increase is more significant for low-skill workers. However, the UB change associated with food stamps is less important for married workers because the program’s income test considers the sum of husband and wife income.
All groups had their work incentives eroded between 2007 and 2010, but the amount was less for married people. In percentage points, the changes are fairly uniform across married skill groups — except the top one. The changes tend to fall with skill among the unmarried, although the most skilled unmarried groups still have a change that is similar to even the less-skilled married groups. In contrast, the more meaningful distinction in the U.K. is having children, because that raises the possibility of having a partial child tax credit and the 41 percent phase-out rate that goes with it. British workers without children have incentive changes that are hardly correlated with skill (and close to zero for the full period 2007–13, as seen in Fig. 5 by comparing the two dashed series.
Some of the lesser temporary American program expansions began to expire in 2010, although a significant fraction of the temporary elevation of work disincentives remained until December 2013 when the maximum allowed duration of unemployment benefits returns to its pre-recession level. But that did not return work disincentives to their previous levels, because some of the expansions of food stamps and unemployment insurance were permanent, or at least long lived.35
More important, the 2010 Affordable Care Act began in 2014 to pay its most significant health insurance subsidies. These subsidies are both income tested and employment tested, and for both reasons have sharply increased work disincentives relative to what they would have been without the law (Mulligan 2014).36 Holding age constant, the ACA disincentives are greater for low-skill workers, even among married workers. Somewhat fewer married-worker disincentives are created by the ACA, but not to the degree as with the temporary programs featured in Fig. 5. The disincentives are not monotone with age because older workers are more skilled but also have greater health expenses that can be subsidized (Mulligan 2015a).
The U.S. and the U.K. implemented different fiscal policy changes in the years following the worldwide financial crisis. The U.S. created or expanded a number of safety net programs that eroded the reward to work by adding to implicit employment and income taxes. The U.S. implicit tax changes were faced by a large number of workers, but the disincentives were most pronounced among unmarried workers. The U.K. changes 2007–13 were less, even for the relatively small fraction of the workforce facing the new and higher tax credit phase-out rate. The U.K. had a fiscal stimulus package too, but it involved cutting marginal tax rates on both personal income and consumption. This difference suggests that the labor market effects of stimulus packages may differ significantly in magntitude, if not direction, according to the microeconomic incentives that they create.
The U.K. tax wedge increased later during the so-called austerity period, leaving it about where it was before the recession, at least for workers not receiving tax credits. High-income taxpayers are not the focus of this paper, but the results herein show that the U.K. was unique by significantly increasing marginal income tax rates for some of them during the 2007–13 time frame. This suggests that benefit-cutting policies may increase marginal tax rates, especially if the benefit cuts primarily relate to people with relatively high employment rates or incomes. Ironically, both austerity and stimulus may create work disincentives.
Due to taxation, some of employer cost goes to the public treasury rather than employees as a reward for their working. The two solid series are an index of the employee reward, calculated as employer cost times one minus the employment tax wedge.38 The British reward series temporarily moves above the corresponding employer cost series as the U.K. temporarily cut its VAT tax and made personal income tax rate cuts a couple of years before other types of rate increases would be implemented. Ultimately the two U.K. series finish close to each other because the employment tax wedge ultimately returns near to what it was in 2007. The U.S. follows a very different pattern, with the reward index falling far below the employer cost index in the early years of the recession.
The two countries’ reward indices finish near each other: well below trend. However, because the two reward indices fall below trend for fundamentally different economic reasons, we should not expect employment changes in the two countries to have much in common. The British reward fell below trend because employer cost fell below trend, whereas the American reward fell below trend because of a tax wedge that was greater at the end of the period than it was before the recession. The tax wedge is symptomatic of redistribution, which has an aggregate income effect on labor supply of ambiguous sign and probably small magnitude. To the extent that falling employer cost in the U.K. reflects low productivity growth or an adverse change in the country’s international terms of trade, it has income and substitution effects on labor supply that go in opposite directions.
In this way, country-specific employment tax wedge time series are a first of many ingredients for cross-country comparisons of labor market dynamics during and after the financial crisis. At this point, the results of this paper at least suggest the possibility that different fiscal policies in the U.S. and U.K. may have contributed to the different employment dynamics shown in Fig. 1.
Both series are from the Organization for Economic Co-operation and Development (hereafter, OECD), via the St. Louis Federal Reserve’s FRED database. In 2007-Q4, the U.K. and U.S. employment rates were 81.5 and 79.8, respectively.
Average quarterly gross flows are from Gomes (2012, Fig. 1), for 1996 through 2010. Quarterly net employment changes are from the OECD, via the St. Louis Federal Reserve’s FRED database and, for comparability with Gomes, for the age 16–64 age group.
The St. Louis Federal Reserve FRED data series UEMPMED shows that the U.S. median duration of unemployment peaked at 25 weeks in June 2010. Also note that, for example, an 18-month nonemployment spell lasting from March 2009 to September 2010 nonetheless involves positive weeks worked in both calendar years (tax years in the U.S. coincide with calendar years).
Note that so-called “tax credits” are technically welfare spending programs in the U.K. rather than a credit to personal income taxes (Office for Budget Responsibility 2015, Tables 4.5 and 4.26). Both tax credits and personal income taxes are based on the same income concept, which this paper references as “personal income.” However, tax credits are claimed jointly by couples and based on their combined income (HM Revenue and Customs 2009b), whereas the personal income tax is based on individual income (HM Government 2015c).
I ignore integer constraints on weeks worked. Also note that many of the tax provisions are administered on a pay-period basis (e.g., weekly, biweekly or monthly). For a worker paid monthly, my model might be better understood as a monthly model: e.g., w is monthly employer cost, n ∈ [0,12] is number of months worked, etc.
UB i is zero for someone who is not a job seeker during the weeks that they are not employed. Job seekers allowances are taxable by the personal income tax, which is why the UB term also appears inside the PIT term.
I abstract from the fact that the personal income tax schedule varies across workers according to their nonlabor income. I also do not model council tax credits. Over the range of family situations considered in this paper, the child benefit (not to be confused with the child tax credit) is a flat amount and thereby does not create work disincentives at the margin.
Technically, the thresholds are different for employee and employer. In fact, PT = ST in 2001–10 and 2014 and within 1–3 pounds per week (out of 139 or more) in the intervening years (HM Revenue and Customs, 2014a).
As with the U.S. Social Security contributions, the U.K. caps a significant part of its NICs, except that the U.K. caps are administered per pay period (e.g., weekly) rather than annually. The capped payments, beginning at what is known as the “upper earnings limit” (UEL) is about 75 percent more than the median weekly earnings of full-time employees. The UEL and its changes are discussed below in connection with personal income tax thresholds.
This is a wedge between productivity y (on the margin of weeks worked) and the worker’s marginal benefit. In a static model such as equation (2), the latter is the marginal effect on consumption ∂c/∂n. However, especially when tax rates vary over time, a worker in a dynamic model may take some of the benefit in terms of future consumption or leisure. In either model, the worker’s marginal benefit can be interpreted as the marginal rate of consumption-leisure substitution (in utility) and the tax wedge (4), calculated in this paper, is properly compared with the “labor wedge” measured from household behavior (Mulligan 2012). As always, it should, for the purpose of this comparison, be noted whether the consumption expenditure ingredient in the labor wedge includes sales taxes. Also note that the tax wedge (4) includes both marginal tax rates faced by workers as well as taxes that add to employer costs.
Unemployment benefits were once indexed to the Retail Prices Index and now to the Consumer Price Index. This paper does not isolate the short-term incentive consequences of that change.
The upper earnings limit is analogous to the American earnings cap — a much lower NICs rate applies above the cap. Note that the upper earnings limit (£817 per week after the cut) was significantly above median weekly earnings.
Even after 2008, the two thresholds were not harmonized for part-year workers (see Appendix II) because the NICs are administered according to the pay interval, whereas the personal income tax is based on year-to-date earnings.
The threshold between the 20 and 40 percent brackets is an annual income amount and is not necessarily evenly divisible by 52 weeks. At the lowest incomes, the PIT and NICs became less harmonized for full-year workers because the PIT’s personal allowance is no longer equal to 52 times the NICs’ primary threshold. This change is reflected in Fig. 2 for annual employer cost below £11,000 as 2009–11 schedules that go from 0 percent to 30 or more in multiple (albeit, barely visible) steps.
The tax credits are paid directly to beneficiaries (HM Government 2015a) whereas personal income taxes and NICs are administered through employers.
The quarterly time series for the median hourly wage among full-time employees is from Office for National Statistics (2014a). See also HM Revenue and Customs (2009a), which gives an example of a couple each working part-time schedules throughout the tax year but nonetheless receiving zero WTC because their annual income, although low by the standards of the median family, is still too high.
The child tax credits are not contingent on work. In principle, the working tax credits (WTCs) are withheld during weeks not at work (with an exception for a four-week spell in between jobs). As a result, if annual income qualifies a worker for a positive WTC, the WTC has both a positive and negative effect on the weekly employment tax wedge. The positive-tax effect comes from the effect of a week’s employment on annual income and therefore the weekly amount of WTC to be received during times of employment. The magnitude of the positive tax effect depends on the phase-out rate and the number of weeks during the year the person is at work (i.e., equation (4) itself would depend on n). The negative-tax effect comes from the withholding of WTC payments during weeks not employed and, for the reasons noted below, is not relevant for my calculations.
For simplicity, Fig. 2 assumes that, for all years 2007–13, the phaseout of the family element of the CTC begins exactly at the income level for which the rest of the CTC is exhausted. In practice, this harmonization of phaseout ranges did not take effect until 2012. Before that, there were incomes for which all of the child element, but none of the family element, was phased out. Note that Fig. 2’s simplifying assumption is of little quantitative significance because the amount of the family element is less than one quarter of the full CTC amount.
Weekly employer cost is taken to be 40*(median hourly wage) + (weekly employer NICs, accounting for the secondary threshold).
Item (c) refers to the income-based JSA, which is examined in Appendix II. The rest of the paper considers only the contributory JSA, the amount of which does not depend on marital status (HM Government 2015b).
For some behavioral analysis, the JSA’s should be discounted relative to the PT because the PT affects all workers, whereas only some of those out of work receive a JSA. During this period, however, changes in JSA per capita were very close in magnitude to changes in both employment and unemployment (BBC 2015, Office for National Statistics 2014b). Also note that the level of q matters for Fig. 5, which means that the magnitude of the changes would tend to be greater if housing allowances were included in my estimates.
For low-wage workers, the withholding of WTC during weeks of nonemployment may be relevant, even while it is not included in my calculations. There are a couple of reasons why it might not be relevant: (a) the worker’s WTC is zero because annual family income is at least 80 percent of full-time full-year earnings at the median hourly wage, (b) the worker’s spell between jobs is four weeks or less, or (c) the worker does not or cannot claim WTC even during weeks of employment (e.g., because the spouse already claims the credit). Moreover, even when relevant, the withholding of WTC hardly effects incentive changes over time because the WTC amount was not significantly changed relative to wages. Beginning in 2013, the child benefit (not to be confused with tax credits) began to be phased out based on the annual income of the adult receiving it. This is a new disincentive for workers with annual incomes between £50,000 and £60,000, which is more than twice the annual income obtained by working full-time full-year at the median hourly wage (among full-time workers). As a result, the new disincentive, which can add significantly more than ten percentage points to the marginal tax rate, depending on the number of children, is not reflected in any of this paper’s exhibits.
The numerator of the 58 percent (which is 100 minus the 42 percent cited in the text) is from Office for National Statistics (2012) and the denominator from Office for National Statistics (2013, ages 20 and over, plus 4/5ths of persons aged 15–19). In the last year that couples jointly filed personal tax returns (1989), 72 percent of persons filing returns (counting husbands and wives separately) were filing unmarried returns (HM Revenue and Customs 2015). The same sources indicate that 8.7 million adults received tax credits in, say, 2011–12, whereas 30.8 million filed personal income tax returns.
It is also difficult to know what a person not working during the tax year would have earned if he had worked. This problem is alleviated, but not absent, in samples of workers; we do not know for sure what a worker would have earned if he had gone back to work a week earlier or had left employment a week later.
Adam and Browne (2013), as well as OECD (2012), also calculate the reward to working a full tax year rather than not working at all. An increase in, say, the personal allowance does not affect the reward to working an additional week except for the small group of people who are working so little during the year that they have not used up their personal allowance. Or consider a person earning, for the tax year, in the 20-percent bracket with an income just below the threshold for the 40-percent bracket. A reduction in that threshold hardly affects the reward to working at all during the tax year but doubles the disincentive from the income tax for working an additional week.
For the purposes of considering non-poor workers, the CTC is a better analogy to the EITC because neither is withheld during weeks not at work. In both countries, the income concept for tax credits is essentially the same as the income subject to personal income tax, even though the U.K.’s tax credits are administered as separate benefit programs.
The federal government’s fiscal year is the year ending September 30. The fiscal year indicates when safety net benefit program parameters are reset, and the nature of the federal budgeting, but not the time frame for performing the income test.
The temporary benefit and eligibility rules for UI and food stamps are too numerous to itemize here: see Mulligan (2012), especially chapter 3.
The tax rates shown in Mulligan (2013) are composites of employment (2/3) and weekly hours (1/3) tax rates. This paper is focused on employment tax rates only, so Fig. 6 reports just the employment component of Mulligan (2013)’s composite. Because hardly any of the composite tax rate changes come from weekly-hours tax rate changes, the results in Fig. 6 are essentially Mulligan (2013, Fig. 7) scaled by 3/2.
Food stamp work requirements have been repeatedly waved since 2009 (Mulligan 2015b). Other food stamp eligibility expansions are permanent in that new legislation would be required for them to return to the pre-recession eligibility rules.
The ACA disincentives more than offset the incentives that were created by the expiration of the aforementioned temporary assistance programs.
The adjusted CPI is the official CPI divided by one plus the consumption tax rate.
In the notation of the paper, the employee reward is (1-q)y. The paper calculates two q series for the median worker in each country: on credits versus off credits for the U.K. and single versus married for the U.S. For the purpose of preparing Fig. 7, a fixed-weighted average of the two series are used according to the proportions of each situation in the adult population.
Fuel and tobacco duty changes are the only non-VAT indirect tax rate changes considered in this paper. According to Institute for Fiscal Studies (2015), a few other changes occurred 2008–13: alcohol duties increased by 6% in real terms in 2008 and then 2% in real terms each subsequent year until 2013 (partial reversals followed in 2013), a 2011 change in the carbon price floor for electricity generation, a new stamp duty land tax rate on large properties, and 2012 changes to vehicle excise duties. These changes are of less aggregate importance than those for fuel and tobacco.
For fuel, I (a) took the April 2007 retail price, £0.928/liter, reported by Vial (2012), (b) backed out the non-VAT part of the retail price using the statutory VAT rate of 17.5%, and (c) subtracted the specific excise rate of £0.5152/liter. For cigarettes, HM Revenue and Customs (2013b) reports a non-tax revenue per typically-priced pack of £0.9255 on March 31 2007.
Note that sellers above the VAT-registration threshold pay the statutory rate on all of their sales, even the sales below the threshold (Keen and Mintz 2004, Onji 2009). In theory, sellers might optimally restrict their size to remain below the threshold, thereby generating no VAT revenue but nonetheless having added marginal costs that reflect the existence of a VAT. The small-seller exemption is just an example of a more general phenomenon: that the marginal tax rate can exceed the average tax due to avoidance and noncompliance behaviors.
In other words, a person reducing leisure would pay the statutory VAT rate on some of his additional consumption, but not all of it. In this case, a revenue-based measure of the consumption tax rate (Mendoza, Razin and Tesar 1994, Immervoll, et al. 2007, Adam 2005) will more accurately represent incentives than the full statutory rate does.
0.066 is 0.86*0.44*(statutory VAT rate) for 2003–7. Recall from above that 0.86 is the ratio of 2003–7 non-VAT revenue to VAT revenue. By using the 0.44 revenue ratio, I am assuming that the non-VAT indirect taxes do not have the small-seller exemption (or other compliance and enforcement features that create marginal costs without obtaining revenue). Because the revenue ratio is VAT revenue divided by total consumption, 0.066 is effectively indirect tax revenue divided by total consumption.
The income-based JSA is also available to persons with weekly earnings (during periods of employment) less than about £150, which is far below the range of earnings scenarios considered in this paper.
I appreciate the financial support of the George J. Stigler Center for the Study of the Economy and the State and discussions with Kyle Herkenhoff, and comments from David Neumark and an anonymous referee.
Responsible editor: David Neumark
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