THE TAX EXPENDITURE BUDGET 

BEFORE AND AJTER 

THE TAX REFORM ACT OF 1986 

Thomas S. Neubig" David Joulfaian* 

U.S. Treasury Department 

OTA Paper 60 October 1988 

OTA Papers and Briefs are circulated so that the preliminary findings of tax research . conducted b staff members and others associated with the Office of Tax Analysis may reach 

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purchased from the National Technical Information Service. 5285 Port Royal Road. 

Springfield. VA 22 161. Phone (703)487-4660. 

Office of Tax Analysis

U.S. Treasury Department. Room 4040 

Washington. DC 20220 

*Director and Chief Economist of the Office of Tax Analysis and Financial Economist. 

Office of Tax Analysis. respectively. The views presented in this paper are those of the 

authors and do not necessarily reflect those of the Treasury Department. The authors are 

grateful to John Wilkins for helpful comments. Jonathan Jones for programming assistance. 

and the entire Office of Tax Analysis for additional estimates of all tax expenditures. 
THE TAX EXPENDTTURE BUDGET BEFORE AND AFTER THE 

TAX REFORM ACT OF 1986 

Abstract 

The Tax Reform Act of 1986 broadened the income tax hase and drastically rediiced tax 

rates. While these changes were designed to be revenue neutral. they led to significant

reductions in govemment subsidies provided through ts~~ expenditures. 

The findings in this paper indicate that the 1986 Act reduced tax expenditures by $190 

billion or ahout 40 percent of what they would have been in the absence ot' tax reform. 

They also suggest that ahout 40 percent of this reduction can he attrihuced to base 

broadening and the remaining 60 percent to lower tax rates. 
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. .. 

THE TAX EXPENDlTlJRE RIJDGET BEFORE AND AFTER THE 

TAX KEFOKM ACT OF 1986 

Contents 

I. Introduction 

11. Background on the Tax Expenditure Budget and Tax Reform Act of 1986 

A. The Tax Ex enditure Budget B. Different EfPects of the 1986 Act on Tax Expenditures 

111. Effects of the Tax Reform Act of 1986 on the Tax Expenditure Budget 

A. General Issues 

B. Estimates of the Effects of the 1986 Act 

C. Effects of Rate Reduction and Base Broadening D. Interaction Between Rate Effects and Base Broadening Effects 

E. Distributional Effects 

IV. Issues in Measuring Tax Expenditures after Tax Reform 

A. Definition of Tax Expenditure Baseline 

B. Outlay Equivalent Versus Revenue Losses 

C. Interaction Among Tax Expenditure Provisions 

D. Timing Issues 

V. Conclusion 
THE TAX EXPENDITURE BUDGET BEFORE AND AFTER THE 

TAX REFORM ACT OF 1986 

I. Introduction 

One of the goals of the Tax Reform Act of 1986 (the " 1986 Act") was to reduce the role of 

the Federal tax system in the U.S.economy. The lack of a comprehensive income tax base 

resulted in higher marginal tax rates which discouraged saving. investment. and work 

effort. and encouraged unproductive investment in tax shelters. Tax preferred activities 

were favored relative to other activities. The 1986 Act enhanced the neutrality of the 

tax system and reduced distortions. One measure of the effect of the t986 Act on the 

reduction in economic distortions caused by the Federal tax system is the change in the 

Federal tax expenditure budget. 

The tax expenditure budget lists "provisions of the Federal tax laws which allow a special 

exclusion. exemption. or deduction from gross income or which provide a special credit. a 

preferential rate of tax. or a deferral of liability." Although the specific provisions 

included in the tax expenditure budget and their measurement are subject to considerable 

controversy. they provide some indication of Federal economic assistance to particular 

activities that could be achieved through the tax Code or alternatively through a direct 

expenditure program. The 1986 Act had a dramatic effect on the Federal government's 

influence on these activities. 

Income tax base broadening and repeal of numerous tax expenditures permitted significant 

reductions in marginal tax rates of both individuals and corporations. Repeal and 

scale-backs of tax expenditures directly reduced the number and amount of tax expenditures. But more importantly. the significant reductions in marginal tax rates decreased 

the value of the remaining tax expenditures. Because most tax expenditures are directly 

related to the taxpayers' marginal tax rate. lower tax rates reduce the value of the tax 

expenditures. For example. the reduction in the top marginal tax rate from 50 percent to 

28 percent lowered the value of the mortgage interest deduction by 44 percent for 

high-income taxpayers. 

Under current law. the simple summation of tax expenditures for calendar year 1988 totals 

$3 15 billion. Under pre-tax reform law. total tax expenditures in I988 would have been 

$510 billion. The 1986 Act reduced aggregate tax expenditures by $190 billion. or 
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by approximately 40 percent of what they would have been in 1988. The reduction in 

marginal tax rates accounted for $1 15 billion. or almost 60 percent of this decline as 

shown in summary Table I. Almost half of the rate recluction effect occurred among 

provisions othenvise unchanged by tax reform. such as the mortgage interest deduction 

and the exclusion of social security benefits. 

This paper is divided into four sections. Section I1 describes the tax expenditure budget 

and how the 1986 Act changed it. We identify provisions that were repealed. scaled back. 

reduced in value by lower marginal tax rates. and expanded by the 1986 Act. In Section 

111. we present estimates of the tax expenditure budget before and after tax reform. In 

addition. we present estimates of the differential effects of rate reduction and base 

broadening. as well as some examples of the distributional effects of several tax expenditures. In the final section. we discuss some of the issues involved in measuring tax 

expenditures that were raised in quantifying the effects of the 1986 Act. 

11. Background on the Tax Expenditure Budget and the Tax Reform Act of 1986 

A. The Tax Expenditure Budget 

The U.S. Department of the Treasury published the firs1 tax expenditure budget in 1967. 

The budget included special exclusions. exemptions, deductions from gross income, special 

credits. preferential rates of tax. and provisions providing deferral of income tax 

liability. The tax expenditure budget is now published annually as Special Analysis G in 

the U.S.Budget, as mandated by the Congressional Budget Act of 1974. Descriptions of the 

tax expenditure baselines. measurement issues. and specific tax expenditures are included 

in Special Analysis G. 

The Treasury's tax expenditure budget includes 1 20 provisions with an outlay equivalent 

value summing individually to over $450 billion in Fiscal Year (FY) 1988. As described in 

Section 1V. the total value of tax expenditures does not necessarily equal the sum of the 

value of individual tax expenditures due to interaction among the provisions. We provide 

some estimates of the extent of interactions between different provisions. The total 

value of tax expenditures may be misleading in its absolute value. and thus we present it 

only for purposes of giving the reader the general order of magnitude. 
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B. Different Effects of the 1986 Act on Tax Expenditures 

The 1986 Act had a number of different effects on the tax expenditure budget. Table 2 

groups the tax expenditure budget into six categories of tax reform effects: provisions 

repealed. provisions scaled back. provisions with rate effect only. expanded provisions. 

new provisions. and provisions unchanged by the Act, 

Tax reform broadened the tax base by repealing 14 provisions and scaling back the eligible 

activity of 16 other provisions. The largest provisions repealed were the investment tax 

credit. the capital gains exclusion. arid the deduction for two earner manied couples. 

The largest provisions scaled back in their scope were the individual Retirement Accounts, 

the deductibility of non-business State and local taxes (due to repeal of the sales tax 

deduction). and the deductibility of interest on consumer credit (which was phased down to 

40 percent in 1988 and repealed by 1990). 

The largest number of tax expenditures were only affected hy the reduction in individual 

and corporate marginal tax rates. Even if the level of eligible activity of lax expenditures remained unchanged. the value of many tax expenditures was reduced by the lbwer 

marginal tax rates. For example. a taxpayer subject to the pre-tax reform top 50 percent 

marginal tax rate and the post-tax reform top 28 percent marginal tax rate had a 44 

percent reduction in the value of certain tax expenditures, such as deductions and tax 

exemptions. If that taxpayer's mortgage interest deduction was $20.000. the after-tax 

cost of the interest expenses rose from $10.000 to $14.400 ($20.000 times one minus the 

marginal tax rate). The value of tax expenditures increased for certain taxpayers whose 

marginal tax rates increased. i.e.. taxpayers sub.ject to the lowest positive marginal tax 

rate of 11 percent before tax reform who might be subject to a 15 percent marginal rate 

after tax reform. 

Although the 1986 Act did not directly restrict a number of "sacred" provisions. the 

reduction in marginal tax rates reduced their value considerahly. For instance. the 

largest changes in tax expenditures subject to only the tax rate effect were the exclusion 

of pension contributions and earnings on employer plans. the exclusion of employer contributions for medical insurance premiums and medical care. and the exclusion of mortgage, 

interest on owner-occupied homes. 
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The 1986 Act took many steps forward in broadening the tax base. and SI few steps backward. 

The Act expanded the scope of I 1 tax expenditures and created 9 IKkiitimal tax expenditures. Provisions. such as the research and experimentation credit and the targeted jobs 

tax credit. were scheduled to expire and were extended for two additionaE years. The 1986 

Act did not create any entirely new tax provisions: most of the new ?axexpenditures are 

exceptions from new general rules. or substitutes for other tax expenditures. For 

instance. the additional deductions for the blind and the elderly replaced special 

exemptions for the same individuals. The low-income housing tax credit replaced special 

accelerated cost recovery deductions. 5-year amortization of rehahilitat ion expenses. 

special deductions for construction period interest and taxes. and tax-exempt bond 

financing for low-income rental housing. 

In some cases. the new and expanded tax expenditures already were in the tax code but 

became tax expenditures due to other changes. For instance. the capital gains exclusion 

at death and on the first $125.000 of home sales increased in value due to the repeal of 

the 60 percent exclusion of long-term capital gains. Tlie exception for $25.000 of rental 

losses from the passive loss limitation rules and the expensing of niultiperiod timber 

growing costs became tax expenditures because the 1986 Act created new general niles 

limiting passive losses 1 and requiring the capiralization of multiperiod expenses. 

The distinction made here between provisions that were scaled back. expanded. and affected 

only by rate reductions is somewhat arbitrary. The 1985 Act in many cases made minor 

changes in the eligible activity that changed the tax base. but the rate reduction effect 

was considerably larger than the tax base change. In those cases. the provision is listed 

under the rate reduction only effect. For instance. the deductibility of charitable 

contributions was tightened slightly. while the rate reduction effect was several times 

larger. 

In addition. the distinction between provisions repealed. scaled back. and affected by 

rate reduction only uses the existing grouping of tax expenditures used in Special 

Analysis G. A somewhat different picture would occur if several tax expenditures were 

more disaggregated or the fully phased in law were applied. For instance. the repeal of 

state and local sales taxes is grouped with nonbusiness state and local taxes other than 

on owner-occupied homes. Thus. State sales. personal prsperty. and income tax deductions 

are included together in the provisions scaled back. Altematively. the sales tax 
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deduction could be grouped with the provisions repealed. and the personal property and 

income-tax deductions could Lx grouped with the provisions affected by rate reduction 

only. In addition. the gradual repeal of the deductibility of interest on consumer credit 

is grouped with the provisions scaled back. because in 1988 40 percent of the deduction 

was still allowed. If the comparison were made after the full phase-in of the 1986 Act. 

the provisions repealed would show a larger effect. 

Table 2 also shows the difference in the value of tax expenditures before and after tax 

reform broken down by separate rate reduction and base hroadening efrects. In Section 

111. we describe the stacking rules used to disaggregate the effect of tax reform into the 

separate effects from rate reduction and base broadening. 

111. Effects of the Tax Reform Act of 1986 on the Tax Expenditure Budget 

The tax expenditure budget in the Fiscal Year 1989 Budget reflects the tax law changes of 

the 1986 Tax Act. but does not separately identify the important changes due to tax 

reform. For example. the tax expenditure budget shows a decline in the value of the net 

exclusion of pension contributions and earnings from employer plans in FY 1987 of $64.1 

billion to $58.7 billion in FY1989. Similarly. the tax expenditure for the exclusion of 

contrihutions and earnings from Inciiviclual Retirement Accoiints falls from $19.3 billion in 

FY I987 to $12.0 billion in FY 1989. In both cases. the declines are a result of the 1986 

Act. but the Act's effect can not be separately identified in the published numbers for 

two reasons, First. the level of activity for most tax expenditures is generally higher 

in FY 1989 than in FY 1987. Second. the use of fiscal years encompassing different taxable 

years. i.e.. FY I987 includes parts of taxable years 1986 and 1987 with their different tax 

rates. confounds the measurement. 

The Office of Tax Analysis staff prepared additional estimates of the tax expenditure 

budget that separately identify tlie effects of the 1986 Act in January 1988. Outlay 

equivalent estimate; were made of all provisions using 1986 (pre-tax reform) and 1988 

(post-tax reform) law assuming the same level of activity (at 1988 levels). In addition. 

the staff estimated 'the value of tax expenditures assunling 1988 law but with 1986 tax 

rates. Using these estimates, one measure of the separate effects of base broadening and 

rate reduction for each provision is presented. Finally. several examples of the 

distributional effects of the tax expenditure changes are shown. 
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A. General Issues 

We use the same baseline and methodology for estimating tax expenditures as used in the 

FY 1989 Budget Special Analysis G. The jndividual and corporate minimum taxes are 

included as part of the tax expenditure baseline. For pcirposes of separating the tax rate 

effects. the tax rate structure encompasses the tax rare schedule. personal exemptions. 

the standard deduction. and the minimum tax. 

It is important to note that tax expenditure estimates assume no behavior effects unlike 

revenue estimates of specific tax legislation. Thus. the tax expenditure estimates hold 

constant the level of activity at 1988 levels. For instance. complete repeal of the 

consumer interest deduction would shift more borrowing against owner-occupiedhomes in the 

form of larger first or second mortgages or home-equity loans. The tax expenditure 

estimates take the amount of consumer and mortgage debt in 1988 as fixed. and estimates 

the tax expenditure for consumer interest assuming thai it is no longer deductihle and no 

additional deductible borrowing occurs. The revenue estimates of the 1986 Act had a 

smaller revenue effect than the tax expenditure estimate due to the expected financial 

rearrangements. 

Some caution is necessary in the measurement of the change in lax expenditures when the 

level of activity is held constant. The 1986 Act. for example. increased marginal tax 

rates on long-term capilal gains. Pre-tax reform tax expenditures in this paper are 

estimated using 1988 levels of realizations. The level of realizations of long-term 

capital gains. however. is lower in 1988 as a result of the higher marginal tax rates. if 

the tax expenditure for the capital gains exclusion were measured at 1986 levels. the tax 

expenditure would he larger due to a higher levei of realizations. Capital gains also 

raises the general issue of the appropriate baseline from which to measure tax expentlitures. which is discussed more fully in Section IV. since one of the justifications for 

the exclusion was a proxy for the lack of inflation indexing of nominal capital gains. 

All estimates are stated in terms of outlay eqriivalent subsidies. The difference hetween 

outlay equivalents and revenue losses. and the reason for presenting outla\: equivalents in 

evaluating the effects of tax reform. are discussed in section IV. 
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B. Estimates of the Effects of the 1986 Act 

The Office of Tax Analysis staff estimated all tax expenditures under pre-tax reform law 

(” 1986 Law”)and current law (” 1988 Law”) for calender year 1988. Using these estimates 

we provide a summary of the effects of the 1986 Act in Table I. 

Table 1 shows the total effect on tax expenditures of tax refomi by the type of changes 

made. Approximately one-fourth of the $190 hillion net reduction in the \7alueof tax 

expenditures due to tax refom occurred on provisions that were unchanged except for the 

reduction in marginal tax rates. Provisions with predominant rate effects were reduced in 

value by $58 billion by tax reform. Ahout 40 percent of the net reduction in the value of 

tax expenditures. approximately $8 I billion. resulted from the repeal of various tax 

expenditures. Another 40 percent. $79 billion. occurred from the combination of rate 

reduction and base broadening on provisions scaled back by the 1986Act. Expanded and new 

provisions increased total tax expenditures hy $25 billion. 

The entire tax expenditure budget showing the separate rate reduction and base broadening 

is listed in Table 2 by type of tax change. In addition. the Apprendix lists each 

provision according to its respective budget function to facilitate the comparison wit11 * 

the published tax expenditure budget in Special Analysis G in the U.S.Budget as well as 

direct outlay programs. 

C. Effects of Rate Reduction and Base Broadening 

In order to separately identify the effects of rate reduction and base broadening on the 

tax expenditure budget. the Office of Tax Analysis staff prepared additional estimates of 

all tax expenditures. The staff estimated the value of tax expenditures assuming the 1988 

tax base. but with the 1986 tax rate structure. The difference between the tax expenditiire estimates under prior law rules and the 1988 law/ 1986 rate estimates is one measure 

of the separate effect of the 1986 Act‘s base broadening prosisions. The difference 

between the 1988 law/1986 rate estimates and the current law estimates is one measure of 

the separate effect of the marginal rate reductions. 

These estimates stack the base broadening provisions before the marginal rate reductions. 

which tends to allocate more of the”tax reform effect to base broadening and less to tax 

rate reduction. The interaction between the rate reduction and tax base changes is 
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explained more fully in the next suhsection. Altemative meastires of the separate effects 

were computed for several important provisions. and do not alter the relative importawe 

of the eflects of rate reduction and tax base changes. 

Table 1 shows the simple summation of the effects of rue reduction and base broadening by 

type of tax reform change. Base broadening reduced the tax expenditure budget by approximately $77 billion. or about 40 percent of the total reduction. Tax rate reduction 

reduced the value of all tax expenditures by approximately $I 15 billion in 1988. or 60 

percent of the total reduction of $190 billion in lax expenditures due to the 1986 Act. 

Table 1 also shows the breakdown by the type of tax refomi change. Repeal of various tax 

expenditures. particularly the investment tax credit. the capital gains exclusion. and the 

3 two-eainer deduction. accounted for $8 1 billion of hase broadening effect. The scalehack 

of tax expenditures contributed an additional $45 billion reduction. Expanded and new 

tax expenditures increased the amount of tax expenditures by $49 billion (before the rate 

reduction effect). so that the net base broadening effect was approximatdy $77 billion. 

Rate reduction reduced the value of the remaining tax expenditures by approximately $1 I5 

billion. Most of the rate reduction effect occurred amxg provisions that were .otherwise 

unchanged by the 1986 Act. Fifty-eiglit billion dollars of rate reduction occurred among 

provisions affected only by rate reduction. Rate reduction reduced the value of 4 

provisions scaled back by $34 billion. compared to $45 billion from scaling back these 

same provisions. Rate reduction reduced the value of expanded provisions by $23 billion. 

The rate reduction reduced the value of both the new eligible activity as well as the 

existing eligible activity. Because of the stacking order used here. rate reduction is 

also shown for the new provisions. The lower tax rates reduced the value of the new 

provisions by about 9 percent of their value had the 1?86 tax rates been in effect. 

D. Interaction Between Rate and Base Broadening Effects 

The effect of the 1986 Act on the level of tax expenditures can be divided among tax rate 

changes and tax base changes in two alternative ways. The tax hase changes can be 

"stacked" first. and then the tax rate changes applied to the new. larger tax base. Or. 

. 
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the tax rate changes can be stacked first against only the old tax base. and then the tax 

base changes can be added against the new. lower marginal tax rates. 'l'he estimates 

in Tahles I and 2. as well as the Appendix. stack the tax base changes before the rate 

changes. 

The effects of the new law on the value of tax expenditure (TE)can be calculated as: 

CITE = TEn - TEo = dR.Bo + Ro .dB + dR.dB .... (I) 

where R is the tax rate. B is the value of the exempt. excluded. or deferred tax 

expenditure activity, and the subscripts o and n refer to pre-tax refomi (old) law and 

post-tax reform (new) law. respectively. 

The total effect is the sum of the rate effect. the base effect. and an interaction 

effect. The rate effect is (Rn-Ro).Bo. or dR.Bo. the change in the average marginal tax 

rate holding the pre-tax reform tax base constant. Similarly. the base broadening effect 

is Ro.(Bn-Bo).or Ro.dB. the change in the value of the eligihle tax expenditure activity 

holding the pre-tax reform tax rate constant. The interaction effect is the product of 

the two simultaneous changes. (Rn-Ro).(Bn-Bo). or dR.dB. 

If both the tax base and rates change and the tax base is stacked first. theti the total 

effect becomes: 

dTE = Ro.dB + Bn.dR .... (2) 

where the base change has the larger effect (includes the interaction term) and the rates 

change a smaller effect. On the other hand. if tax rate changes are stacked first. then 

the total effect becomes: 

dTE = dR.Bo + Rn.dB ..I. (3) 

where the tax rate change has the larger effect (includes the interaction term) and the 

base change a smaller effect. 

The difference between the two approaches is the interaction term of the tax rate and tax 

base changes. shown in equation 1. If the tax base change is stacked first against the 

pre-tax reform rates, the tax base change is larger due to the higher pre-tax reform rates 

(in equation 2) than when stacked second against the lower new rates (in equation 3). 
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When the tax rate change is stacked second against tile smaller amount of allowahle tax 

expenditure deductions (in equation 2). the rate effect is smaller than if it had heen 

stacked first (in equation 3). 

Due to the amount of work involved in the hundreds oi calculatiuns. only one method was 

used to calculate the change for all tax expenditures. In this paper. rate and base 

hroadening effects were estimated with the tax hase stacked first (equation 2). which 

tends to allocate more of the tax reform effect to base broadening. Thus. the separate 

effects of the tax rate and tax base changes on tlie vaiue of tax expenditures in Tables I. 

2. and the Appendix are measured stacking the tax base changes first. 

Thus far we have focused on changes in the tax hase reflecting changes in a single 

provision. A further stacking order issue arises when more than one base broadening 

provision is included. For example. by expanding taxable income and pushing taxpayers 

into higher marginal tax brackets. base broadening prnvisions will affect the value of tax 

expenditures with only rate effects. Equations 1-3 assume that the tax expenditures are 

evaluated before all other changes in the law (stacked first against prior law). 

Alternatively. the tax expenditures could be evaluated after all other changes in the law 

(stacked last against prior law or stacked first against current law). as shown in 

equation 4: 

dTE = Ro.dB + Bn.dR f Bn.dRoc ... (4) 

where dRoc is (he change in marginal tax rates brought ahut hy other base broachers. 

and. generally. dR<O. dB<O. and dRoc>O. 

The estimates presented in Tables 1 and 2. as well as the Appendix. were derived using 

equation (2). not equation (4). Changes in the tax base are stacked first against prior 

law one provision at a time. All of the interaction teim. BndRoc. is attributed to the 

rate effect. This interaction from other base broadening effects will generally he a 

positive number. Thus. the estimates presented in this paper will generail!, understate 

the rate reduction effect. 
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E. Distributional Effects 

Lower marginal tax rates and a broader tax base reduced tax expenditures and changed the 

distribution of the remaining tax expenditures. With the significant reduction in the top 

marginal tax rate. many expected that tax expenditures would be disproponionately reduced 

for Iiiglier-income taxpayers. To illustrate tlie distrihutional effects of tlie 1986 Act on 

tax expenditures. we present two examples: contributions to indiviciuai retirement plans 

and the mortgage interest deduction. It should be noted that the distributional effect of 

the 1986 Act on tax expenditures differs from the final incidence of tlie 1986 Act. 

primarily hecause no behavioral effects are included in the tax expenditure analysis. 

Tables 3 and 4 show the change in tax expenditures due to the 1986 Act for contributions 

to individual retirement plans and the mortgage interest deduction. respectively. The 

tables also show the separate effects of rate reduction and base broadening with two 

alternative stacking orders: with base broadening stacked first. and with rate reduction 

stacked first. These tables differ from the base hroadening effects shown in Tables I and 

2. because the base broadening effect includes all of the base broadeners as described in 

equation 4. not just the single provision. In other words. the single provision is 

stacked after all other base broadenets. not hefore them. This stacking order does not 

change the general results. but requires some explanations presented below. 

1. Retirement Plans 

Under prior law. a working taxpayer could deduct up to $2.000 (plus $250 for anon-working 

spouse) of contributions to individual retirement accounts (IRAs) from taxable income. 

The 1986 Act scaled back this deduction reported by taxpayers covered under employerprovided retirement plans. The deduction is phased-out for taxpayers with adjusted gross 

income (AGI) between $40,000 and $50.000 for joint filers and $25.000 and $35.000 for 

5 single taxpayers. The deduction of contrihutions to IRAs by the remaining taxpayers is 

retained under the Act. 

As shown in Table 3. the scaleback of deductihle retirement contributions and the rate 

reduction disproportionately reduce the tax expenditures of high income families. 

Depending on the stacking order. the scaleback in eligibility accounts for 94 percent 

ofthe total reduction if stacked first. and 75 percent of the scale hack if stacked 
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after the tax rate reduction. The scaleback in eligihili[y was intended lo eliminate lhe 

deduction for high income taxpayers. 

The effect of the rate reduction also disproportionately reduced the remaining tax 

expenditures of high income taxpayers. The rate reduction effect. stacked after the base 

broadening provisions. reduced the value of tax expenditures by 16 percent for taxpayers 

with economic income below $30.000. while reducing the tax expendirures by 36 percent for 

the highest income taxpayers. A siniilar distributional effect occ~lrswhen the rate 

reduction was stacked before the base hroadeners. 

2. Mortgage Interest Deduction 

The 1986 Act retained the full deductibility of owner-occupied home mortgage interest 

expenses. The deduction's tax expenditures. however. were reduced by lower marginal tax 

rates and the expansion of the standard deduction. 

Although not directly affected hy the 1986 Act. the value of mortgage interest deductions 

fell by 27 percent in 1988 as a result of the Act. Tax expenditures for mortgage interest 

fell from $34.2 billion under prior law to $25.0 billion after tax reform. This reduction 

occurred principally due to the lower marginal tax rates. Although the effect on tax 

expenditures of lower marginal tax rates is well recognized. higher standard deductions 

and tax thresholds also reduce the value of tax expenditures for many low income families. 

as exemplified by the mortgage interest deduction. 

Table 4 shows that the value of the tax expenditures declined across all income classes. 

The effects of the 1986 Act. however. are U-shaped. The tax expenditure of the lowest 

income taxpayers (those few who itemize deductions) fell by 36 percent. for families with 

incomes of $50.000 to $100.000 the reduction was only 23 percent. and increased to 42 

percent for the highest income families. This U-shaped pattern is due to the large 

reduction in marginal tax rates at high incomes and the increased stanclard deduction at 

low incomes. The higher standard deduction reduces the amount of excess iteniizecl mortgage 

interest deductions. which determine the amount of the tax expenditure. 

- Table 4 shows two different types of base broadening effects. Base broadening can push 

taxpayers into higher marginal tax rates. thereby increasing the value of tax expenditure especially when valued under the old rate structure. Base broadening among itemized 
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deductions can also reduce the amount of excess itemized deductions (deductions in excess 

of the standard deduction). which reduces the value of the tax expenditures. When all 

base broadeners are stacked before the rate reduction (and the higher standard deduction). 

the higher marginal rate effect outweighs the standard deduction effect for mortgage 

interest. Column 4 of Table 4 shows that the base broadening provisions. if enacted 

alone, would have pushed all of the income groups. except the $i10.000-$20.000 group. into 

higher marginal tax brackets under prior law to more than offset the standard deduction 

effect. 

The mortgage interest tax expenditure would have been $2.5 billion higher. without the 

rate reduction. When the rate reduction is stacked lpst after all base broacleners. as in 

equation 4. the rate reduction totals $I 1.8 billion. The entire effect of the 1986 on 

mortgage interest deductions ($9.9 billion) is attributed to rate reduction in Table 2 

and the Appendix since the interaction of the other base broadeners is not taken into 

account. as in equation 2. 

Column 7 shows that when base broadeners are added after rate reduction. the base 

broadening effect is negative for low and middle income families and positive for high 

income families. The repeal of state and local sales tax deductions and the scaleback of 

consumer interest deductions make mortgage interest deductions less likely to be excess 

itemized deductions (deductions above the standard cleduction). Thus. the other base 

hroadeners reduce the value of mortgage interest deductions by reducing excess itemized 

deductions. For high income taxpayers. the effect of being pushed into higher marginal 

tax rates exceeds the effect of the reduced excess itemized deductions. 

IV. Issues in Measuring Tax Expenditures after Tax Reform 

The tax expenditure budget does not have a clearly defined conceptual basis and the 

empirical implementation of the budget is no1 always consistent intemally or with other 

aspects of the budget. The 1986 Act changes raised a host of issues underlying the tax 

expenditure budget. We note several of these issues below. 
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A. Definition of the Tax Expeiiditui-eBaseline 

Several of the provisions in the 1986 Act raised issues of the conceptual baseline for the 

tax expenditure budget. Examples of these include ( I ) uniform capitalization rules. (2) 

the minimum tax. and (3) the treatment of passive losses. among others. 

1. Uniform Capitalization Rules 

Under pre-tax reform law. businesses were not required to capitalize interest expenses 

associated with most production activity occurring over several taxable years. The 1986 

Act required multiperiod production interest expenses are required to be capitalized and 

deducted over the life of the contract. The 1986 Act. however. exempted timher producers 

from this requirement and allowed them to continue to expense such costs. 

OTA and OMB treat the exception of timber producers from the uniform capitalization niles 

as a new tax expenditure. Although the tax treatment of timber was unchanged by the 1986 

Act. the general rule for capitalizing interest was tightened. Thus. the exemption for 

tiniber became a special provision rather than part of a general tax provision. 

2. Alternative Miiiiiniim Tax 

The I986 Act toughened the minimum tax system for both individuals and corporations. The 

minimum tax could be treated three different way in the tax expenditure budget baseline. 

First. the minimum tax could be included as part of the tax expenditure baseline. and 

part of the tax rate structure. This is tile way the minimum tax was treated in the 

OTA/OMB budget. with the value of tax expenditures reduced by the effect of the minimum 

tax. Since the minimum tax is an integral part of the Federal income tax system. with its 

alternative minimum tax credit carryover mechanism simply smoothing the timing of income 

tax payments. it is considered part of the tax rate structure. 

Second. the minimum tax coulcl be excluded from the tax expenditure baseline. and viewed as 

a penalty tax imposed as part of the income tax structure. Tax preferences scaled back by 

the minimum tax might be viewed as negative tax expenditures. The net effect of the 
-1spositive tax expenditure from the regular income tax and the negative tax expenditlire from 

the minimum tax would give the same estimate as when ihe minimum tax is included as part 

of the baseline. 

Finally. the minimum tax could be defined as a separate tax system with its own tax 

expenditure budget. Deviations from the minimum tSLv baseline could he identified in a 

separate tax expenditure budget. For instance. the exception of public piirpose tax-exempt 

bonds from the minimum tax base would he such a tax expenditure. 

The alteinative minimum tax also raises a iiuniher of measurement issues as well. The 

corporate book income provision indirectly scales hack many tax expeiirlitures. It is 

difficult to attribute the additional tax liability from the book income provision to 

specific tax expenditures. Also the alternative minimum tax credit carryover affects the 

present value of many tax expenditures. 

3. Passive Loss Limitation 

Passive loss limitation rules enacted in I986 prevent taxpayers from offsetting losses 

from "passive" activities against income from "active" activities. This raises the 

question of whether the passive loss limitation is a new general tax nile that should be 

incliiclerl as part of the baseline. Some coiild argue that it was intended as a new general 

rule and should be part of the baseline. Others could argue that it is a targeted 

provision limited to a particular type of economic activit!. and should not be part of the 

baseline. If the passive loss limitation is not part of the baseline. then it is the 

equivalent to an exception to the general tax rules that penalizes targeted activities. or 

the equivalent of a negative tax expenditure. 

The passive loss limitation itself has a special exception for oil and gas activity. If 

the passive loss limitation is part of the haseline. then the oil and gas exception woulcl 

be a tax expenditure. If it is not part of the baseline. then the oil and gas exception 

woulcl not be a tax expenditure. 

Special Analysis G treats the passive loss limitation as part of the baseline. However. 

it does not include the oil and gas exception in the FY 1989 budget because the Code does 
-16-

not provide sufficient guidelines for measuring the exception's tax expenditure value. 

The Code does not specify whether taxpayers in oil and gas activity would be treated like 

partnerships and other businesses with "passive" and "active" activities. or treated like 

taxpayers with rental property where all activities are designated as "passive". One 

possible approach. albeit arbitrary. would he to apply the general passive loss limitation rules and designate royalty interests as passive and working interests as active. 

Depending on the way these ventures are financed and interests are "fractioned". however. 

the working interest may consist of active as well as passive activities. 

B. Outlay Equivalents Versus Revenue Losses 

Two measures of the cost of tax expenditiires are employed in Special Analysis G. These 

are the revenue loss or forgone revenue approach and the outlay equivalent approach. The 

revenue loss estimates equal the anlotint by which taxes are reduced by the tax expenditure provision. The outlay equivalent estimates. on the other hand. eqrial the budget 

cost of a comparable. substitute direct expenditure program valued in pre-tax dollars. 

As described below. outlay equivalent estimates are the best measure of the change in the 

value of tax expenditures resulting from tax reform. 

Outlay equivalent and revenue loss estimates differ for two types of tax expenditures: ( I ) 

provisions equijvalent to tax-free grants. and (2) provisions with revenue losses panially 

offset through the loss of other tax benefits. 

An example of a provision equivalent to a tax-free grant is the research and experimentation (R&E) tax credit. The R&E credit provides a 20 percent tax credit to companies that 

increase their R&E spending. If companies making R&E expenditures were provided a direct 

grant. the grant would be included in their taxable income and would be sub-ject to tax. 

The RRrE tax credit. however. is not included in the taxable income of the company. and 

thus is the equivalent of a tax-free grant. Each $I of R&E tax credit provides the 

equivalent of $1.33 of equivalent taxable outlay for a taxpayer in the 2S percent marginal 

tax rate. The revenue loss estimate only includes the $1 of the tax credit. while the 

outlay equivalent includes the additional "tax saving" resulting from the exempt ion. 

An example of a provision with a partially offsetting loss of tax benefit is the targeted 

jobs tax credit (TJTC). The TJTC is equivalent to a taxable grant. because companies must 

include the amount of the tax credit earned in their taxable income hy reducing the amount 
-17-

of wage deductions by the amount of the credit. The TJTC revenue loss estimate assumes 

that the companies' taxable income increases clue to the lower wage deductions. which 

partiall), offset the amount of credits received. Direct outlays which are taxable. 

however. are not assumed to increase total taxahlc income in tlie economy. Thus. if an 

equivalent targetedjobs program paid out $100 million. then the budget outlay would show 

$100 million. even though the equivalent tax credit program would show a revenue loss of 

$75 million for taxpayers suI?ject to a 25 percent marginal tax rate. 

In measuring the effects of tax reform on tax expenditures. the use of revenue loss 

estimates can lead to the peculiar result of lower tax rates increasing tax expenditures. 

For instance. assume that the TSTC program was unchanged by tax reform with credits equal 

to approximately $100 million annually, Before tax reform. with corporations subject to a 

marginal tax rate of 46 percent. the revenue loss estimate would be $54 million ($100 

million times one minus tlie marginal tax rate). After tax reform, with a lower 34 percent rare. the revenue loss estimate for an unchanged program would be 566 million. or 20 

percent higher. In contrast. the outlay equivaient estimate would remain unchanged at 

$100 million without the misleading rate reduction effect. This anomaly is avoided by 

comparing outlay equivalent estimates before and after tax reform. 

C. Iiiteractioii Among Tax Expenditlire Provisions 

The value of tax expenditure provisions are interrelated due to [lie non-linear and 

progressive tax rate structure of the current law system. If one provision is repealed or 

modified. the value of other items in the budget may change as a result of taxpayers 

pushed into higher marginal tax rate brackets. becoming subject to the minimum tax. or 

switching to the standard deduction. 

The interaction among tax expenditures may cause significant measurement problems. Each 

tax expenditure is estimated assuming its repeal while holding all other provisions in the 

tax system constant. While facilitating the estimation of individual tax expenditures. 

the inherent deficiency of this procedure is (hat it generally leads to overstating tlie 

value of deductions and. to a lesser extent. understating the value of exclusions. 

To demonstrate the strong interaction among provisions. we estimated the marginal effects 

of repealing five deductions and five exclusions froni income and present the results in 

Table 5. The deductions include home mortgage interest. state and local income taxes. 
-18-

state and local real estate taxes. charitable conirihutions. and the dediiclion For medical 

expenses. Exclusions include empbyer contributions to pension plans. employer contributions to medical and health insurance plans. contributions to Individual Retirement 

Accounts. social security benefits. and tax exempt interest. 

Under pre-tax reform law. the simple summation of the marginal effects of the exclusions 

is estimated at $93 billion. When estimated together for the total combined effect. their 

value rises to $95 billion an increase of $2 billion or about 2 percent of the total. The 

combined effect is greater than the sum of the individual provisions because the combination of multiple base broadeners pushes some taxpayers into higher marginal tax brackets. 

The simple summation of the marginal effects of the five deductions is estimated at $89 

billion under prior law. When estimated together. after accounting for possible 

interaction effects. their value falls to $81 hillion. a reduction of $8 billion or 9 

percent of the total. 

The repeal of multiple deductions has two different effects. The repeal of several 

deductions increases taxpayers' taxable income and pushes them into higher marginal tax 

brackets. similar to that of repealing multiple exemptions. ' This causes the sum of 

individual provisions to be lower than the combined effect. The combination of deductions 

also lowers many taxpayers' deductions below the standard deduction. This will cause tlie 

sum of individual provisions to he larger than the combined effect. When people shift to 

the standard deduction. further cutbacks on itemized deductions have no revenue effect. 

For these five provisions. the standard deduction effect outweighs the higher niarginal tax 

rate effect. 

The interaction among itemized deductions under current law is greater than that under 

pre-tax reform law. Under current law. the sum of the individual effects of deductions in 

Table 6 is $61 billion while the combined effect is $48 hillion. The interaction among 

itemized deductions increased from 9 percent to 22 percent of the sum of the indi\vidual 

effects after tax reform due to the higher standard dec;uction more than offsetting the 

effect of lower tax rates. In contrast. the interaction effects among exclusions are 

relatively stable. Interaction effects among tlie five cxclusions before and after tax 

reform account for about $3 billion. or 2.5 percent of the total. 
-19-

D. Timing Issues 

The tax expenditure budget generally uses the net cash flow estimates of tax expenditures. 

Dollars are counted as spent in the.year the receipts are forgone. even when there are 

additional commitments to future tax expenditures or offsetting tax receipt changes in 

later years. This can lead to potentially misleading statistics and apparent anomalies in 

tax expendititre estimates. 

Use of net cash flow receipts understates the effects of tax provisions with large future 

year tax consequences. For instance. the new low income housing tax credit is spread over 

a ten year period. Although the FY I989 Budget tax expenditure estimate for I988 was $425 

million. the total cost of the program for the invest me,^^ done in 1988 will he several 

multiples of the first year cost. Changes in other multi-year tax commitments. such as 

tighter limitations on- tax-exempt bond financing. will reduce tax expenditures for 20-30 

years in the future on the smaller level of tax-exempt bonds issued in 1988. Thus. 

comparisons of the tax expenditure value and the effcct of tax reform on provisions 

involving multi-year commitments with provisions having only a single year effect. such as 

the child-care credit. are misleading. 

Many tax expenditures arise from the acceleration in the timing of expense deductions or 

the deferral of taxable income. The exemption of timber production from the uiiifonn 

capitalization rules. for instance. enables companies to accelerate deductions. Companies 

can deduct their timber produciion costs immediately (expensing) rather than capitalizing 

the costs and effectively deducting the cost when the trees are hanrested. This 

acceleration has a favorable effect on the present value of deductions for taxpayers. The 

deferral of taxable income is equivalent to an interest free loan from the govemment in 

the amount of the deferred income. 

Due to growth in production levels. the amount of accelerated deductions in the initial 

years from recent investments usually exceeds income recognized in later years from prior 

investments. As long as the activity level is growing. the amount of tax deferred income 

keeps growing. If a tax deferral activity reaches a period of declining in\-estment. 

however. the repayment of prior interest-free loans can be greater than the amoitnt of new 

tiorrowing (deferred income). If the level of activity diminishes. then repayments will 

exceed deferrals. This actually occurred in FY87-89with oil and gas exploration and 
-20-

development costs. The tax expenditure estimales fcii- oil and gas exploration and 

development costs are negative because the steep decline in activity resulted in a larger 

amount of old loans being repaid (deferred income becoming subject to lax) than new loans 

being created (new income being deferred). 

Because the tax expenditure budget is on a net cash flow basis. it shows the tax 

expenditure for oil and gas exploration as 8 negative due io the repayment of old "loans." 

This is misleading in two respects. First. the smaller level of new oil and gas exploration still benefits from tax deferral with an associated positive tax expenditure. 

Second. due to the lower tax rates after tax reform. the value of tlie tax deferral on the 

old loans increased. The tax deferral under prior law wa.~the equivalent of borrowing 46 

cents for each dollar of deduction. but after tax reform the repayments will only be 34 

cents for each dollar of deferred income. Thus. the tax expenditure budget does not 

include the forgone revenue of companies paying hack pre\*iouslydeferred income at lower 

marginal tax rates. 

V. Conclusioii 

The dramatic reduction in tax rates and the broadening of the tax base under tax reform 

significantly reduced the value of federal resoiirce allocation programs run through the 

tax code, The repeal and scale back of numerous tax expenditure provisions facilitated 

the transition into a lower tax rate environment. Lower tax rates. in turn. reduced the 

value of tax expenditure provisions otherwise untouched ny the I986 Act. 

Overall. the 1986 Act reduced the amount of government suhsiclies provided through the tax 

system by $190 billion. or 40 percent of what they would have been in 1988 in the absence 

of tax reform. The reduction in marginal tax rates accounted for 60 percent of this 

reduction. 

The Tax Refomi Act of 1986. ancl more specifically the accounting changes it hrouglit aliout. 

have added an additional layer of ambiguity and complexity to tlie tax expenditure 

estimation process. Further work in the identification and measurement of tax 

expenditures is needed to make the tax expenditure budget more useful for budget ancl 

economic analyses. 
-2 1 -

FOOTNOTES 

1 As noted in section Ill. some worild argue that the passive loss limitation rilles 

should not be part of the tax expenditure baseline. since they are targeted to only passive activities. In that case. the passive loss liniitation rules might he 

considered a negative tax expenditure. arid the rental exemption no longer a tax 

expendit ure. 2 The difference between outlay equivalent and revenue loss estimates is described in 

Section Ill. 

3 A sniall amount of rate reduction effect is shown for the transition relief of some 

investment tax credits. 

4 The small amoitnt of base broadening effecr is shown for several provisions which had 

minor base broadening relative to the rate reduction effect. 

5 The exclusion of current investment eamings on IRAs continues and existing IRAs are 

granclfathered. In addition. non-deductible lRAs with tax-deferred investment income were 

permitted. The current exclusion and deferral of investment eamings are not included in 

Table 4. 
Table 1. EFFECT OF TAX REFORM ON OUTLAY EQUIVALENT

ESTIMATES FOR TAX EXPENDITURES BY TYPE OF EFFECT 

($ millions 1988 levels) 

Tax Reform Tax Reform 

Base Rate Total 

Types of Tax Reform Change Effect Effect Effect 

Provisions Repealed -80,690 -470' -81,160 

Provisions Scaled Back -45,045 -34,355 -79,400 

Provisions with Rate Effects 

Only -59S3 -57,245 -57,840 

Expanded Provisions 44,310 . -23,000 21,310 

New Provisions 5,020 -970 4,050 

Total -77,000 -116,040 -193,040 

Includes rate effect on a small amount of transition 

activity of repealed provisions. ' Includes provisions with predominant rate effects not 

included elsewhere. 

Includes provisions with very small amount of base 

broadening effect. 

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Pre-Tax 1988 

34,293 25,014 

27,350 17,151 

12,106 8,544 

11,965 8,055 

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