While some tax expenditures help society achieve auspicious goals—by encouraging charitable giving or helping families who face costly health situations, for example—others are poorly targeted, inappropriate, and disproportionately benefit high-income households. Reforms could simplify taxes, make the distribution of income less unequal, and bring in billions of dollars for government revenues annually.

In 2018, deductions, credits, exclusions and other tax expenditures cost the government more than $1.3 trillion in revenue, which is about 6.3% of GDP.

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High income households are more likely to use tax expenditures, creating “upside-down” subsidies that disproportionately benefit the well-off.
The Tax Cuts and Jobs Act of 2017 reduced the federal revenue loss via tax expenditures by about 10% for 2018-2020.

In principle, an income tax could apply the same progressiverate schedule to all the income a person earns in the year. In practice, oursystem falls far short of this notion. Largely, this is due to the significantpresence of “tax expenditures”—deductions, credits, and other preferences that canreduce people’s tax burdens. People often call tax expenditures “loopholes,”suggesting that taxpayers are exploiting some unintended or narrowly offeredbenefit. But many of them serve millions of households across most incomelevels. These preferences are the equivalent of government spending that occursthrough tax rules —which is where the term “tax expenditure” comes from.

Tax expenditures substantially reduce government revenue. In 2018, they cost the government more than $1.3 trillion in lost revenue, which is about 6.3% of GDP, almost 80% of actual income tax revenue, and more than outlays for Social Security or Medicare and Medicaid combined.

While there are some narrowly targeted provisions (for professional sports stadiums, for example), the costliest tax preferences offer benefits to millions of households. These include subsidies for certain pass-through businesses (those that do not face the corporate tax), employer-provided health insurance, mortgage interest, charitable gifts, state and local taxes, retirement saving, capital gains (profit from asset sales), child-rearing, work, and education.


Taxexpenditures are tilted toward high-income households. In 2019, atenth of the pre-tax income of the top 1% of earners came from non-businessincome tax expenditures, compared to only around 5% of the income of householdsin the middle quintile. That’s because high-income households are likelier touse these provisions and because exemptions and deductions create “upside-down”subsidies that disproportionately benefit the well-off. Even if taxexpenditures reduce taxable income by the same amount for differentbeneficiaries, they reduce taxes more for higher-income households that facehigher marginal tax rates. In contrast, a dollar’s worth of credit reduceseveryone’s taxes by the same amount (provided the credit is fully refundable).

The TaxCuts and Jobs Act of 2017 (TCJA) will reduce federal revenue lost totax expenditures by about 10% for 2018–20. Most of the increased revenue comesfrom limiting the deduction for state and local taxes, raising the standarddeduction (which reduces the share of tax filers who itemize), and loweringmarginal income tax rates (which reduces the value of a given deduction). Atthe same time, the TCJA expanded the child tax credit and created a new 20%deduction for certain pass-through business income.

Broadening the tax base and taxing all forms of income at the same rate—that is, closing tax expenditures—is generally the right direction for tax reform, and it has much to offer. It raises efficiency by eliminating the need to choose based on tax considerations. It improves fairness by not playing favorites across different sources or uses of income. It simplifies taxes by reducing the number of artificial distinctions between taxpayers. Reforming tax expenditures raises revenues in a progressive and efficient way that cuts de facto government spending, so it can appeal to both conservatives and liberals.

One approach to reforming tax expenditures is to cap an individual’s overall tax expenditures at either a dollar amount or a percentage of income. During his 2012 presidential election campaign, Mitt Romney proposed various caps on itemized deductions, including $17,000, $25,000, and $50,000. Alternatively, Feldstein, Feenberg, and MacGuineas (2011) proposed a cap equal to 2% of a taxpayer’s adjusted gross income (AGI) for all tax expenditures. Capping overall deductions has the political advantage of not explicitly limiting any particular subsidy, but also means that charitable contributions—the most “discretionary” component of itemized deductions—are likely to be most affected. Moreover, questions inevitably arise over which tax expenditures should be included in the cap.

A second approach is to convert all itemized deductions to 15% credits. This would eliminate the “upside down” feature that gives larger benefits per dollar spent to high-income households compared to low-income households. But neither this approach, nor capping the overall level of tax expenditures, distinguishes enough between effective and ineffective tax expenditures.

While many policy discussions tend to lump tax expenditurestogether, several of the major tax expenditures make sense. The deduction formedical expenses, for example, helps families that face extremely expensivehealth situations. The deduction for charitable contributions encourages peopleto contribute directly to charity and is based on the reasonable premise thatgivers shouldn’t pay tax on the funds they give away. Nevertheless, several taxexpenditures are poorly targeted or inappropriate. Many small tax expenditures deservethe pejorative term “loopholes” and should be eliminated, including, but notlimited to, preferential capital gains treatment of coal royalties, income fromcertain timber sales, deductions for bonds used to finance sports stadiums, andspecial rules for certain film and television production expenses. Eliminatingthese types of tax expenditures wouldsave at least $10 billion per year.

Inmy recent book, I discuss several tax expenditure programs thatcould usefully be reformed. First, capital gains that are held until death arenever taxed under the income tax. The inheritor receives them at their currentvalue. Taxing these gains at death would raise revenue, eliminate a majorloophole in the tax system, and make taxes fairer.

Second, the exclusion of employer-provided health insurancesubsidizes the purchases of expensive and excessive health insurance plansduring a time when controlling health costs is a major priority. Treating suchplans as taxable income for middle- and higher-income households would raiserevenue, reduce health care costs, and close another distortion in the economy.The recent movement to repeal the Affordable Care Act’s so-called “Cadillactax” on high-cost employer-provided health plans moves in theopposite direction.

Third, the mortgage interest deduction (MID) has littleeffect on homeownership, contrary to popular belief. Only8% of households currently use the deduction, and most of thosehouseholds are in the highest tax brackets. Instead, the deduction encouragesthe construction of larger, more expensive houses, which leads to higher energycosts, urban sprawl, and fewer investment funds available for businesses.Phasing out the deduction and replacing it with a refundable tax credit of$10,000 for each of the approximately 2 million first-time homeowners each yearwould encourage homeownership, not home indebtedness. It would also be lessexpensive, more progressive, and far more effective than the MID in boostinghomeownership rates.

Finally, the rules regarding the new deduction for pass-through businesses will cause numerous problems. The benefits of the policy, which allows an individual to deduct up to 20% of their income from pass-through entities (e.g., sole proprietorships and partnerships), are inequitable—about 44% of the benefits go to taxpayers with incomes greater than $1 million per year. This deduction provides windfall gains to owners who made investments in the past without increasing current investment. Moreover, these rules create enormous opportunities to game the tax system and create incentives for people to relabel wage income as business income. Repealing the pass-through deduction would restore the long-standing notion that wages and business income should be taxed at the same rate.

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I would like to thank Grace Enda, Claire Haldeman, and Aaron Krupkin for providing valuable assistance.