How Many Taxpayers Itemize Under Current Law?

September 12, 2019

The Tax Cuts and Jobs Act (TCJA) increased the standard deduction from $6,500 to $12,000 for individuals (and from $13,000 to $24,000 for married filers) and reduced the value of certain itemized deductions. These changes reduce the percentage of taxpayers that itemize deductions and limit the ability of the tax code to encourage certain types of spending.

Itemizing allows taxpayers to deduct certain expenses from their taxable income. These expenses include mortgage interest, state and local taxes, charitable donations, and a few other deductions found on Form 1040, Schedule A. In lieu of itemizing, taxpayers can reduce their taxable income by a flat amount via the standard deduction. If a taxpayer’s itemized deductions are more than the standard deduction, they are best off itemizing. Otherwise, the standard deduction provides a larger reduction in taxable income.

With the Tax Foundation’s model, we estimate the percentage of itemizing taxpayers by income group for 2019, under both current and pre-TCJA law.

Percentage of Itemizing Taxpayers by Income Group

Source: Tax Foundation General Equilibrium Model, April 2019.

Income Group Current Law (2019) Pre-TCJA Law (2019)
0% to 20% 1.2% 3.7%
20% to 40% 2.5% 9.3%
40% to 60% 5.3% 21.9%
60% to 80% 13.8% 45.3%
80% to 90% 30.3% 67.8%
90% to 95% 50.2% 82.2%
95% to 99% 72.8% 91.5%
99% to 100% 91.5% 92.1%
TOTAL 13.7% 31.1%

We estimate about 13.7 percent of taxpayers will itemize in 2019. This is more than 17 percentage points lower than it would have been in 2019 under pre-TCJA law. The difference in the proportion of itemizing taxpayers is largest for the third income group quintile (40 percent to 60 percent). The proportion of taxpayers in this quintile that would have itemized in 2019 under pre-TCJA law would have been nearly four times higher than the proportion of taxpayers that we estimate will itemize under current law.

Increasing the standard deduction makes it less likely a taxpayer’s itemized deductions will exceed the standard deduction. Additionally, the TCJA reduced the value of several itemized deductions. For instance, the TCJA reduced how much interest can be deducted from taxable income when paying a home mortgage, from interest paid on $1 million in principal down to $750,000, and capped the state and local tax deduction at $10,000.

It is also worth noting that the TCJA decreased the tax benefit associated with deductions by lowering individual income tax rates. Deducting one dollar from taxable income before the TCJA’s income tax rate cuts would have reduced a top earner’s tax liability by $0.396. Now, a dollar deduction for a taxpayer with income in the top marginal income tax bracket would reduce this tax liability by $0.37.

By increasing the standard deduction and  limiting certain itemized deductions, the TCJA reduced the percentage of taxpayers that itemize and limited how much the tax code can award tax relief to taxpayers who spend in particular ways.

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