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The Tax Policy Center's

Briefing Book

A citizen’s guide to the fascinating (though often complex) elements of the US tax system.

Tax Policy Center Briefing Book

Some Background

  • Briefing Book
  • Federal Budget Outlook
  • How did the TCJA affect the federal budget outlook?
  • Chapters
    • Introduction
      • Introduction
        • Introduction
    • Some Background
      • Federal Budget
        • What are the sources of revenue for the federal government?
        • How does the federal government spend its money?
        • What is the breakdown of revenues among federal, state, and local governments?
        • How do US taxes compare internationally?
      • Federal Budget Process
        • How does the federal budget process work?
        • What is the history of the federal budget process?
        • What is the schedule for the federal budget process?
        • What is reconciliation?
        • How is a budget resolution enforced?
        • What is PAYGO?
        • What are rescissions?
      • Federal Budget Outlook
        • How accurate are long-run budget projections?
        • What have budget trends been over the short and long term?
        • How much spending is uncontrollable?
        • What are tax extenders?
        • What options would increase federal revenues?
        • What does it mean for a government program to be off-budget?
        • How did the TCJA affect the federal budget outlook?
      • Taxes and the Economy
        • How do taxes affect the economy in the short run?
        • How do taxes affect the economy in the long run?
        • What are dynamic scoring and dynamic analysis?
        • Do tax cuts pay for themselves?
        • On what do economists agree and disagree about the effects of taxes on economic growth?
        • What are the economic effects of the Tax Cuts and Jobs Act?
      • Economic Stimulus
        • What is the role of monetary policy in alleviating economic downturns?
        • What are automatic stabilizers and how do they work?
        • What characteristics make fiscal stimulus most effective?
      • Distribution of Tax Burdens
        • How are federal taxes distributed?
        • Are federal taxes progressive?
        • How should progressivity be measured?
        • What is the difference between marginal and average tax rates?
        • What criticisms are levied against standard distributional analysis?
        • How should distributional tables be interpreted?
        • Who bears the burden of the corporate income tax?
        • Who bears the burden of federal excise taxes?
        • How do financing methods affect the distributional analyses of tax cuts?
        • How do taxes affect income inequality?
      • Tax Expenditures
        • What are tax expenditures and how are they structured?
        • What is the tax expenditure budget?
        • Why are tax expenditures controversial?
        • What are the largest tax expenditures?
        • How did the TCJA affect tax expenditures?
      • Tax Gap and Tax Shelters
        • What is the tax gap?
        • What does the IRS do and how can it be improved?
        • What is a tax shelter?
      • Recent History of the Tax Code
        • What did the 2008–10 tax stimulus acts do?
        • What did the American Taxpayer Relief Act of 2012 do?
        • How did the Tax Cuts and Jobs Act change personal taxes?
        • How did the Tax Cuts and Jobs Act change business taxes?
    • Key Elements of the U.S. Tax System
      • Individual Income Tax
        • What is the standard deduction?
        • What are itemized deductions and who claims them?
        • How did the TCJA change the standard deduction and itemized deductions?
        • What are personal exemptions?
        • How do federal income tax rates work?
        • What are tax credits and how do they differ from tax deductions?
        • How do phaseouts of tax provisions affect taxpayers?
      • Capital Gains and Dividends
        • How are capital gains taxed?
        • What is the effect of a lower tax rate for capital gains?
        • What is carried interest, and how is it taxed?
        • How might the taxation of capital gains be improved?
      • AMT
        • What is the AMT?
        • Who pays the AMT?
        • How much revenue does the AMT raise?
        • How did the TCJA change the AMT?
      • Taxes and the Family
        • What is the child tax credit?
        • What is the adoption tax credit?
        • What is the earned income tax credit?
        • Do all people eligible for the EITC participate?
        • How does the tax system subsidize child care expenses?
        • What are marriage penalties and bonuses?
        • How did the TCJA change taxes of families with children?
      • Taxes and the Poor
        • How does the federal tax system affect low-income households?
        • What is the difference between refundable and nonrefundable credits?
        • Can poor families benefit from the child tax credit?
        • Why do low-income families use tax preparers?
        • How does the earned income tax credit affect poor families?
        • What are error rates for refundable credits and what causes them?
        • How do IRS audits affect low-income families?
      • Taxes and Retirement Saving
        • What kinds of tax-favored retirement arrangements are there?
        • How large are the tax expenditures for retirement saving?
        • What are defined benefit retirement plans?
        • What are defined contribution retirement plans?
        • What types of nonemployer-sponsored retirement savings accounts are available?
        • What are Roth individual retirement accounts?
        • Who uses individual retirement accounts?
        • How does the availability of tax-favored retirement saving affect national saving?
        • What’s the difference between front-loaded and back-loaded retirement accounts?
        • What is an automatic 401(k)?
        • How might low- and middle-income households be encouraged to save?
      • Taxes and Charitable Giving
        • What is the tax treatment of charitable contributions?
        • What entities are tax-exempt?
        • Who benefits from the deduction for charitable contributions?
        • How would various proposals affect incentives for charitable giving?
        • How large are individual income tax incentives for charitable giving?
        • How did the TCJA affect incentives for charitable giving?
      • Taxes and Health Care
        • How much does the federal government spend on health care?
        • Who has health insurance coverage?
        • Which tax provisions subsidize the cost of health care?
        • How does the tax exclusion for employer-sponsored health insurance work?
        • What are premium tax credits?
        • What tax changes did the Affordable Care Act make?
        • How do health savings accounts work?
        • How do flexible spending accounts for health care expenses work?
        • What are health reimbursement arrangements and how do they work?
        • How might the tax exclusion for employer-sponsored health insurance (ESI) be reformed?
      • Taxes and Homeownership
        • What are the tax benefits of homeownership?
        • Do existing tax incentives increase homeownership?
      • Taxes and Education
        • What tax incentives exist for higher education?
        • What tax incentives exist to help families pay for college?
        • What tax incentives exist to help families save for education expenses?
        • What is the tax treatment of college and university endowments?
      • Tax Complexity
        • Why are taxes so complicated?
        • What are the benefits of simpler taxes?
        • What policy reforms could simplify the tax code?
      • Wealth Transfer Taxes
        • How do the estate, gift, and generation-skipping transfer taxes work?
        • Who pays the estate tax?
        • How many people pay the estate tax?
        • What is the difference between carryover basis and a step-up in basis?
        • How could we reform the estate tax?
        • What are the options for taxing wealth transfers?
        • What is an inheritance tax?
      • Payroll Taxes
        • What are the major federal payroll taxes, and how much money do they raise?
        • What is the unemployment insurance trust fund, and how is it financed?
        • What are the Social Security trust funds, and how are they financed?
        • Are the Social Security trust funds real?
        • What is the Medicare trust fund, and how is it financed?
      • Excise Taxes
        • What are the major federal excise taxes, and how much money do they raise?
        • What is the Highway Trust Fund, and how is it financed?
      • Energy and Environmental Taxes
        • What tax incentives encourage energy production from fossil fuels?
        • What tax incentives encourage alternatives to fossil fuels?
        • What is a carbon tax?
      • Business Taxes
        • How does the corporate income tax work?
        • What are pass-through businesses?
        • How are pass-through businesses taxed?
        • Is corporate income double-taxed?
      • Tax Incentives for Economic Development
        • What is the new markets tax credit, and how does it work?
        • What is the Low-Income Housing Tax Credit and how does it work?
        • What are Opportunity Zones and how do they work?
      • Taxes and Multinational Corporations
        • How does the current system of international taxation work?
        • How do US corporate income tax rates and revenues compare with other countries’?
        • What are the consequences of the new US international tax system?
        • How does the tax system affect US competitiveness?
        • How would formulary apportionment work?
        • What are inversions, and how will TCJA affect them?
        • What is a territorial tax and does the United States have one now?
        • What is the TCJA repatriation tax and how does it work?
        • What is the TCJA base erosion and anti-abuse tax and how does it work?
        • What is global intangible low-taxed income and how is it taxed under the TCJA?
        • What is foreign-derived intangible income and how is it taxed under the TCJA?
    • How Could We Improve the Federal Tax System?
      • Comprehensive Tax Reform
        • What is comprehensive tax reform?
        • What are the major options for comprehensive tax reform?
      • Broad-Based Income Tax
        • What is a broad-based income tax?
        • What would and would not be taxed under a broad-based income tax?
        • What would the tax rate be under a broad-based income tax?
      • National Retail Sales Tax
        • What is a national retail sales tax?
        • What would and would not be taxed under a national retail sales tax?
        • What would the tax rate be under a national retail sales tax?
        • What is the difference between a tax-exclusive and tax-inclusive sales tax rate?
        • Who bears the burden of a national retail sales tax?
        • Would tax evasion and avoidance be a significant problem for a national retail sales tax?
        • What would be the effect of a national retail sales tax on economic growth?
        • What transition rules would be needed for a national retail sales tax?
        • Would a national retail sales tax simplify the tax code?
        • What can state and local sales taxes tell us about a national retail sales tax?
        • What is the experience of other countries with national retail sales taxes?
        • What did the President’s Advisory Panel on Federal Tax Reform say about the national retail sales tax?
      • Value Added Tax (VAT)
        • What is a VAT?
        • How would a VAT be collected?
        • What would and would not be taxed under a VAT?
        • What would the tax rate be under a VAT?
        • What is the difference between zero rating and exempting a good in the VAT?
        • Who would bear the burden of a VAT?
        • Is the VAT a money machine?
        • How would small businesses be treated under a VAT?
        • What is the Canadian experience with a VAT?
        • Why is the VAT administratively superior to a retail sales tax?
        • What is the history of the VAT?
        • How are different consumption taxes related?
      • Other Comprehensive Tax Reforms
        • What is the flat tax?
        • What is the X-tax?
      • Recent Comprehensive Tax Reform Proposals
        • Simple, Fair, and Pro-Growth: Proposals to Fix America’s Tax System, Report of the President’s Advisory Panel on Federal Tax Reform, November 2005
        • The Moment of Truth: Report of the National Commission on Fiscal Responsibility and Reform, December 2010
        • Debt Reduction Task Force, “Restoring America’s Future,” Bipartisan Policy Center, November 2010
        • The Tax Reform Act of 2014: Fixing Our Broken Tax Code So That It Works for American Families and Job Creators, House Ways and Means Committee
        • The Graetz Competitive Tax Plan, Updated for 2015
      • Return-Free Tax Filing
        • What is return-free filing and how would it work?
        • What are the benefits of return-free filing?
        • What are the drawbacks of return-free filing?
        • How would the tax system need to change with return-free filing?
        • Who would qualify for return-free filing?
        • Would return-free filing raise taxes?
        • What was the experience with return-free filing in California?
        • What other countries use return-free filing?
    • The State of State (and Local) Tax Policy
      • State and Local Revenues
        • What are the sources of revenue for state governments?
        • What are the sources of revenue for local governments?
      • Specific State and Local Taxes
        • How do state and local individual income taxes work?
        • How do state and local sales taxes work?
        • How do state and local property taxes work?
        • How do state and local corporate income taxes work?
        • How do state estate and inheritance taxes work?
        • How do state earned income tax credits work?
        • How do state and local severance taxes work?
        • How do state and local soda taxes work?
        • How do marijuana taxes work?
      • Fiscal Federalism and Fiscal Institutions
        • How does the deduction for state and local taxes work?
        • What are municipal bonds and how are they used?
        • What types of federal grants are made to state and local governments and how do they work?
        • What are state rainy day funds, and how do they work?
        • What are tax and expenditure limits?
        • What are state balanced budget requirements and how do they work?
    • Glossary
      • Glossary
        • Glossary

How did the TCJA affect the federal budget outlook?

Federal Budget Outlook

<7/7
Federal Budget and Economy
Q.

How did the TCJA affect the federal budget outlook?

A.

The Tax Cuts and Jobs Act cut taxes substantially from 2018 through 2025. The resulting deficits will add $1 to $2 trillion to the federal debt, according to official estimates. The debt increase will be larger if some of TCJA’s temporary tax cuts are extended.

At the start of 2017, congressional Republicans often spoke about revenue-neutral tax reform. The revenue losses from tax cuts would be offset by rolling back tax breaks or introducing other taxes, most notably a destination-based cash flow tax—sometimes called the border-adjusted tax. The destination-based cash flow tax attracted intense opposition from business groups, especially retailers, and was eventually dropped. Lawmakers then pivoted to a combination tax cut and reform. The Tax Cuts and Jobs Act (TCJA) was the result.

Estimating TCJA’s budget impact

The Joint Committee on Taxation and the Congressional Budget Office have published several estimates of TCJA’s expected budget impact. These estimates all show TCJA substantially reducing revenues and increasing deficits over its first decade. The specific amount varies—from about $1 trillion to $2 trillion—for three reasons.

First, the agencies estimated budget impacts using both conventional methods (which do not account for potential changes to the overall economy) and dynamic methods (which do). Second, the agencies originally estimated the budget impacts against a budget baseline established in 2017, when the act was debated and enacted. They later published updated figures using a 2018 baseline, which included new economic and budget information. Third, official scores typically do not include any new debt service costs resulting from tax cuts or spending increases. Projections for the entire budget, however, do include debt service.

Conventional estimates

During legislative debate, the most-cited estimate was that the TCJA would increase deficits by about $1.5 trillion over 10 years. This figure comes from the Joint Committee on Taxation (JCT) and Congressional Budget Office’s (CBO’s) conventional score. JCT projected that the law would reduce revenues by $1.65 trillion from 2018 to 2027. That deficit increase would be partly offset, CBO and JCT projected, by $194 billion in reduced spending, primarily on health insurance.

In a subsequent update, CBO estimated the conventional budget effect at almost $1.9 trillion over the same period. That increase reflected an updated view of certain features of the law as well as new economic projections.

Dynamic estimates

JCT’s original dynamic score found that the TCJA would boost economic activity (not growth) by an average of about 0.7 percent over the budget window. That growth would reduce the deficit impact by about $385 billion—a $451 billion boost to revenues, partly offset by $66 billion more in spending for higher interest rates. Including macroeconomic effects, TCJA would thus increase the deficit by slightly less than $1.1 trillion over a decade. CBO’s 2018 update increased that figure to about $1.4 trillion.

Debt service costs

To finance TCJA’s tax cuts, the government will issue additional Treasury securities and pay additional debt service. Including that spending, the deficit effects of TCJA are larger. CBO’s 2018 update, for example, puts the conventional deficit increase from TCJA at almost $2.3 trillion over its first decade. The corresponding dynamic score is a $1.9 trillion increase.

Expiring provisions

To satisfy budget process requirements, lawmakers decided to sunset some provisions of the TCJA. Most cuts to individual income taxes, for example, expire at the end of 2025. Business expensing for new investment is also temporary. As conventionally scored, the act thus increased deficits from 2018 through 2026 and decreased them thereafter. If lawmakers decide to extend all the expiring provisions, however, that would add about $480 billion to deficits through 2027 and a growing amount thereafter.

Later decades

The TCJA was enacted under a process known as reconciliation. Among other things, reconciliation requires that a bill not increase the deficit beyond the 10-year budget window. At the time, JCT and CBO concluded that the act satisfied that requirement on a conventional scoring basis. Indeed, they found that the law reduced deficits starting in 2027. If TCJA’s expiring provisions are eventually made permanent, however, deficits will be persistently higher.

Historical context

Any way you slice it, the TCJA was a major tax reduction. Tax revenues will average just 16.7 percent of GDP from 2020 to 2024, according to CBO’s latest projections. That’s well below the 17.4 percent of GDP average from 1970 to 2019.

Revenues would rise to 18.0 percent of GDP by 2030 if all TCJA’s temporary provisions expire as scheduled. Revenues would be 17.5 percent of GDP if those provisions are extended.

Those revenues are far below expected spending, which CBO sees rising from 21 percent of GDP in 2020 to 23.4 percent in 2030. Absent dramatic spending cuts or revenue increases, the public debt will continue to grow faster than the economy.

Updated May 2020
Data Sources

Congressional Budget Office. 2017. “Cost Estimate for the Conference Agreement on H.R. 1.” December 15. Washington, DC: Congressional Budget Office.

———. 2018. “Estimated Deficits and Debt under the Conference Agreement of H.R. 1.” January 2. Washington, DC: Congressional Budget Office.

———. 2020. “The Budget and Economic Outlook: 2020 to 2030.” Washington, DC: Congressional Budget Office.

Joint Committee on Taxation. 2017. “Estimated Budget Effects of the Conference Agreement for H.R. 1, 'The Tax Cuts and Job Act'.” JCX-67-17. Washington, DC: Joint Committee on Taxation.

———. 2017. “Macroeconomic Analysis of the Conference Agreement for H.R. 1, The 'Tax Cuts and Jobs Act'.” JCX-69-17. Washington, DC: Joint Committee on Taxation.

Further Reading

Auerbach, Alan J., William G. Gale, and Aaron Krupkin. 2018. “The Federal Budget Outlook: Even Crazier After All These Years.” Washington, DC: Urban-Brookings Tax Policy Center.

Gale, William G., Hilary Gelfond, Aaron Krupkin, Mark J. Mazur, and Eric Toder. 2018. “Effects of the Tax Cuts and Jobs Act: A Preliminary Analysis.” Washington, DC: Urban-Brookings Tax Policy Center.

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