How do the standard and itemized deductions compare?
Both reduce taxable income by the amount of the allowed deduction; the tax savings depend on the taxpayer’s bracket. About two-thirds of taxpayers claim the standard deduction (figure 1).
Tax filers may choose to take the standard deduction or to itemize the actual amounts spent on allowed deductible expenses. The most common itemized deductions are state and local taxes, mortgage interest, charitable contributions, medical and dental expenses, and casualty and theft losses.
Most taxpayers choose the standard deduction because it is larger than the deductions they can itemize. Others choose that option because it’s easier than identifying and totaling the expenses they could itemize or because they do not realize that itemizing would reduce their tax liability.
In a 2002 study, the Congressional Research Service (CRS) estimated that roughly 950,000 tax filers would have saved more than $470 million on their 1998 tax returns if they had itemized mortgage interest and state and local income taxes instead of claiming the standard deduction. Adding charitable contributions and other taxes to the mix, the CRS found that some 2.2 million taxpayers could have saved nearly $1 billion by itemizing.
Who Itemizes and How Much Do They Claim?
High-income taxpayers are much more likely to itemize. In 2014, more than 90 percent of tax returns reporting adjusted gross income (AGI) over $500,000 itemized deductions, compared with just under half of those with AGI between $50,000 and $100,000 and less than 10 percent of those with AGI under $30,000 (figure 2).
The limitation on itemized deductions (sometimes called “Pease” after the Ohio congressman who proposed it) reduces deductions for high-income taxpayers by 3 percent of the amount by which their AGI exceeds a threshold—$261,500 in 2017 ($287,650 for heads of household, $313,800 for married couples filing jointly, and half of that for married couples filing separately)—but not by more than 80 percent of deductions claimed. The 2001 tax act phased out the limitation and it disappeared entirely from 2010 through 2012 before the American Taxpayer Relief Act of 2012 restored it in its current form.
How Much and What Expenses Do Itemizers Deduct?
Itemized deductions averaged about $27,400 in 2014 for the 44 million tax units claiming them. The amount claimed rises with income, from just under $16,000 for taxpayers with AGI under $50,000 to about $30,000 for those with AGI between $100,000 and $500,000 and more than $230,000 for those with AGI over $500,000 (figure 3).
State and local taxes accounted for over 40 percent of average itemized deductions in 2014, or about $11,800. The mortgage and other interest deductions made up another 25 percent, averaging about $7,000. Charitable contribution and miscellaneous deductions averaged about $4,800 each, or about 17 percent of total itemized deductions (figure 3).
Married couples filing jointly typically claim higher deductions, averaging more than $39,000 in 2014. Itemized deductions averaged over $25,000 for single filers and about $26,000 for heads of households. The differences across filing status reflect both the higher standard deduction for joint filers—their itemized deductions must be higher to make itemizing the better choice—and the higher average income of couples relative to unmarried tax filers.
Internal Revenue Service. Statistics of Income—2014 Individual Income Tax Returns. Table 1.2. “All Returns: Adjusted Gross Income, Exemptions, Deductions, and Tax Items, by Size of Adjusted Gross Income and by Marital Status, Tax Year 2014”; Table 1.3. “All Returns: Sources of Income, Adjustments, Deductions, Credits, and Tax Items, by Marital Status, Tax Year 2014”; and Table 2.1. “Returns with Itemized Deductions: Sources of Income, Adjustments, Itemized Deductions by Type, Exemptions, and Tax Items by Size of Adjusted Gross Income, Tax Year 2014.”
Urban-Brookings Tax Policy Center. Tax Facts. “Personal Exemption and Standard Deduction 2001-2015.”
Joint Committee on Taxation. 2001. Study of the Overall State of the Federal Tax System and Recommendations for Simplification, Pursuant to Section 8022(3)(B) of the Internal Revenue Code Of 1986, vol. 2. JCS-3-01. Washington, DC: Joint Committee on Taxation. (especially individual income tax proposals 5, 6, 7, and 10)
———. 2007. “Selected Data Related to the Federal Tax System.” JCX-11-07. Washington, DC: Joint Committee on Taxation. (especially tables 6, 7, and 8)
———. 2011. “Present Law and Historical Overview of the Federal Tax System.” JCX-1-11. Washington, DC: Joint Committee on Taxation.
President’s Advisory Panel on Federal Tax Reform. 2005. Simple, Fair, and Pro-Growth: Proposals to Fix America’s Tax System. Washington, DC: President’s Advisory Panel on Tax Reform. (especially chapters 3 and 5)
US General Accounting Office. 2002. Tax Deductions: Further Estimates of Taxpayers Who May Have Overpaid Federal Taxes by Not Itemizing. GAO-02-509. Washington, DC: US General Accounting Office.