Itemized Deductions

Certain personal expenses, such as mortgage interest on a primary residence, can be deducted against personal ordinary income to lower the amount of income tax, but not payroll tax, owed. These personal expense deductions are called itemized deductions because the taxpayer must list each individual deduction and the amount.

Alternatively, the taxpayer can choose the standard deduction, which is based on filing status. However, a married couple where neither spouse qualifies as a head of household must both either itemize their deductions or claim the standard deduction, unless the couple is divorced or legally separated, in which case each spouse can choose independently. For a couple filing separately, they can each claim the itemized expenses that they paid, including expenses for property owned jointly, such as the primary residence. For instance, if both spouses paid mortgage interest and real estate taxes, then each can claim the portion that they paid.

The decision to itemize deductions or to use the standard deduction can be changed by amending the taxpayer's return by filing Form 1040X, Amended U.S. Individual Income Tax Return within the 3-year period of the due date for the original return. Taxpayers who were married and filed separately must make the same change — both either itemizing or claiming the standard deduction.

Under the new tax package passed by the Republicans at the end of 2017, known as the Tax Cuts and Jobs Act, a new provision nearly doubles the standard deduction to $24,000 for married couples filing jointly, $18,000 for head of household, and $12,000 for single and married filing separately.

The Tax Effects of a Higher Standard Deduction and No Personal Exemptions

Under the new Republican tax plan, people who do not itemize deductions will receive a higher deduction because of the higher standard deduction, which more than compensates for the elimination of the personal exemption for single taxpayers, which, for 2018, would have been $4100. For instance, for a single taxpayer, the standard deduction would have been $6500, so, combined with the $4100 for the personal exemption, would have yielded a $10,600 deduction. Under the new tax plan, with a higher standard deduction of $12,000, this single taxpayer would be entitled to an additional $1400 deduction. However, most people with dependents will receive less of a deduction because of the elimination of the dependent exemptions.

Itemizers will receive less of a deduction. Prior to 2018, people who itemized instead of claiming the standard deduction could claim both itemized deductions plus the personal exemption. By eliminating the personal exemption, itemizes will lose more than $4000 of deductions. For instance, if a single taxpayer claimed $12,000 of itemized deductions, then the taxpayer could both deduct the $12,000 plus a personal exemption, which in 2018 would have been $4100. Under the new Republican tax plan, the taxpayer can only claim the $12,000 standard deduction. This won't make much difference for the wealthy, most of whom have tens of thousands of dollars of itemized deductions, but for the millions of taxpayers who claim the mortgage interest deduction, medical or dental deductions, state and local, or property taxes, charitable deductions, interest paid on money borrowed for investments, such as margin interest, or other itemized deductions, it will make a significant difference.

Itemized Deductions

Most itemized deductions are subject to a floor, which is a percentage of the adjusted gross income (AGI), that must be subtracted from the itemized amount to determine the deduction. For instance, most medical expenses can be itemized, but they are subject to a 10% floor. So if John Doe has an AGI of $100,000 and a 10% AGI floor, then the first $10,000 of his medical expenses is not deductible. Some itemized deductibles have a ceiling, also expressed as a percentage of AGI, which sets the maximum that can be deducted. For instance, there is a ceiling of 60% (increased from 50% by the new tax law) of the AGI for most charitable contributions, so John can deduct a maximum of $60,000 for charitable contributions.

Itemized deductions are claimed on Schedule A of Form 1040, and include the following:

Under the new tax package passed by the Republicans at the end of 2017, known as the Tax Cuts and Jobs Act, a new provision that applies in 2018 and afterwards, will limit the total amount that can be deducted as any combination of state and local income taxes or sales taxes, or property taxes to $10,000. Additionally, this GOP bill will prevent filers from deducting any prepayments of these 2018 taxes in 2017. Additionally:

Itemized Deductions for Expenses Incurred Doing Volunteer Work

Expenses incurred doing volunteer work are itemized deductions. Deductions include the following:

Because only expenses that are paid are deductible, nondeductible items include the value of services provided by the volunteer. So an attorney, for instance, cannot deduct her hourly rate while working for a charity. Also, expenses incurred only indirectly because of the charity work cannot be deducted, such as for babysitting children while the parents do charity work. The rental value of a home offered by the homeowner to a charity as a means of fundraising, such as selling raffle tickets for a specific amount of time in a vacation home, cannot be deducted by the homeowner.

As with all deductions, records and proof of deduction must be kept, but if expenses exceed $250, then the taxpayer must also receive a written acknowledgement from the organization receiving the benefit.

Historical Note: Pease Limit

Under the new tax package passed by the Republicans at the end of 2017 to benefit the wealthy, known as the Tax Cuts and Jobs Act, the Pease Limit was eliminated, so there are no restrictions on itemizing deductions for the wealthy.

There was a phase-out rule — often called the Pease limit, after the Congressman instrumental in enacting it — restricting the use of itemized deductions for upper-income taxpayers:

Pease Limit: Income Thresholds for the Phaseout of Itemized Deductions
Filing status Phaseout Threshold Amount (Pease Limit)
  2018 2017 2016 2015 2014 2013
Single $266,700 $261,500 $259,400 $258,250 $254,200 $250,000
Head of Household $293,350 $287,650 $285,350 $284,050 $279,650 $275,000
Married Filing Jointly $320,000 $313,800 $311,300 $309,900 $305,050 $300,000
Married Filing Separately $160,000 $156,900 $155,650 $154,950 $152,525 $150,000
  • Adjusted annually for inflation.
  • These income thresholds are same for the phaseout of personal and dependent exemptions.
  • Itemized deductions are reduced by 3% of the AGI that exceeds the threshold amounts until they equal an 80% reduction, so even the richest taxpayers will still be able to reduce their taxable income by 20% of their itemized deductions.
  • The higher the amount of itemized deductions, the higher the income at which 80% phaseout occurs.
  • The itemized deduction phase-out rule does not apply to itemized deductions for:

To calculate the amount of allowable itemized deductions:

Deductible Amount = Total Itemized Deductions − (Income − Pease Limit) × 3%

Example: Itemized Deduction Phaseout Rules

A married couple filing jointly earns $450,000 and has $30,000 of itemized deductions. Therefore, the amount of their itemized deductions that is actually deductible is:

Sample of 80% Phaseout Incomes
80% of Itemized
Income at 80% Phaseout
Single Filers Joint Filers
$30,000 $24,000 $1,050,000 $1,100,000
$60,000 $48,000 $1,850,000 $1,900,000
$90,000 $72,000 $2,650,000 $2,700,000
$120,000 $96,000 $3,450,000 $3,500,000
$150,000 $120,000 $4,250,000 $4,300,000
$180,000 $144,000 $5,050,000 $5,100,000
$210,000 $168,000 $5,850,000 $5,900,000
$240,000 $192,000 $6,650,000 $6,700,000
$270,000 $216,000 $7,450,000 $7,500,000
$300,000 $240,000 $8,250,000 $8,300,000