When you file a federal income tax return, you get to subtract either the standard deduction — a flat dollar amount based on your filing status — or your itemized deductions — a list of specific qualifying expenses you actually paid during the year. You can only use one method per year, and the goal is simple: choose whichever one gives you the larger deduction.
Since the Tax Cuts and Jobs Act of 2017 nearly doubled the standard deduction, about 90% of taxpayers now take the standard deduction. But for the 10% who itemize, the difference can be substantial.
The Standard Deduction in 2025
The standard deduction is a flat amount you can subtract from your income, no questions asked and no receipts required. For 2025:
- Single or Married Filing Separately: $15,000
- Married Filing Jointly or Qualifying Surviving Spouse: $30,000
- Head of Household: $22,500
If you’re 65 or older or blind, you get an extra amount on top of the base standard deduction:
- Single or Head of Household: +$2,000 per qualifying condition
- Married Filing Jointly: +$1,600 per qualifying condition per spouse
So a single filer who is 65 or older gets $16,550. A married couple both over 65 gets $32,300. This extra amount is automatic — you don’t need to do anything to claim it other than use the standard deduction.
What You Can Itemize
Itemized deductions are reported on Schedule A of Form 1040. The main categories:
- State and local taxes (SALT): State income taxes (or sales taxes, if higher) plus property taxes, capped at a combined $10,000 per return.
- Mortgage interest: Interest on loans up to $750,000 for mortgages originated after December 15, 2017 (up to $1 million for older loans). Your lender sends Form 1098 each January.
- Charitable contributions: Cash donations to qualifying 501(c)(3) organizations, up to 60% of AGI. Donated property is deductible at fair market value.
- Medical and dental expenses: Only the amount that exceeds 7.5% of your adjusted gross income.
- Casualty and theft losses: Only for federally declared disasters, above a threshold.
- Investment interest expense: Interest paid to borrow money for taxable investments, limited to net investment income.
When Itemizing Beats the Standard Deduction
Itemizing only makes sense when your total qualifying expenses exceed your standard deduction. The most common situations where itemizing wins:
High Mortgage Interest
If you have a large or recent mortgage, mortgage interest can be substantial in the early years when most of each payment is interest. Example: a $500,000 mortgage at 7% generates about $35,000 in interest in the first year. Combined with $10,000 in SALT, that’s $45,000 in itemizable expenses — well above the $30,000 married standard deduction.
High State and Local Taxes
Taxpayers in high-tax states (California, New York, New Jersey, Massachusetts) with expensive properties often hit the $10,000 SALT cap easily. If you’re paying $8,000 in state income tax and $12,000 in property tax, the SALT cap limits you to $10,000 — but combined with mortgage interest and charitable donations, you may still exceed the standard deduction.
Large Charitable Donations
If you made a significant cash donation or donated appreciated property (like stock), the deduction can be large enough to tip the scales toward itemizing. Donating $20,000 to charity while also paying $10,000 in SALT creates $30,000 in itemizable deductions for a married couple — just above the standard deduction.
High Medical Expenses
If you or a family member had a major medical event — surgery, extended hospitalization, long-term care — unreimbursed costs above 7.5% of AGI can be deductible. For someone with $60,000 in AGI, medical expenses above $4,500 are deductible. Costs of $20,000 or more would generate a large deduction.
The Bundle Strategy: Bunching Deductions
If your itemizable expenses are consistently close to but below your standard deduction, consider bunching: concentrating deductions into alternating years. For example:
- In Year 1: make two years’ worth of charitable donations, prepay January’s mortgage payment, pay any optional state tax installments early. Itemize this year.
- In Year 2: make no charitable donations, take the standard deduction.
Bunching lets you exceed the standard deduction in alternating years rather than falling short every year. A donor-advised fund is a useful tool for bunching — you can contribute a large amount in one year (getting the deduction immediately) and distribute grants to charities over multiple years.
What You Lose When You Itemize
Choosing to itemize doesn’t eliminate the additional standard deduction for age 65+. However, itemizing requires significantly more recordkeeping: receipts, mortgage statements (Form 1098), property tax bills, and written acknowledgments from charities for donations of $250 or more. If you’re audited, you’ll need documentation for every line on Schedule A.
Above-the-Line Deductions Work Either Way
Regardless of whether you itemize or take the standard deduction, certain “above-the-line” deductions reduce your AGI and are available to everyone:
- Traditional IRA contributions (subject to income limits if you have a workplace plan)
- HSA contributions
- Student loan interest (up to $2,500, subject to income limits)
- Self-employed health insurance premiums
- Half of self-employment tax
- Educator expenses (up to $300)
These deductions reduce your AGI, which affects eligibility for the EITC, premium tax credits, and other income-sensitive benefits. Prioritize these before deciding between standard vs. itemized.
How to Decide
The practical approach: add up your potential itemized deductions before you file. If they’re clearly below your standard deduction, take the standard deduction and move on. If they’re close or above, itemize. Tax software does this comparison automatically — it will flag when itemizing produces a better result.
Further Reading
- How to Get the Most from Tax Deductions
- How to File Your Taxes: A Step-by-Step Guide
- HSAs and Taxes
- What Is a Tax Deduction?
- Taxes Overview
This article is for general educational purposes only and does not constitute tax or financial advice. Tax laws change and individual situations vary – consult a qualified tax professional or the IRS for guidance on your specific situation.