Standard vs. Itemized Deductions: How to Know Which Saves You More

The Basics: What Are Deductions?

Tax deductions reduce your taxable income — the number used to calculate how much federal income tax you owe. If you earn $90,000 and claim $15,700 in deductions, you are taxed on $74,300 instead of $90,000. At a 22% marginal rate, that deduction saves you $3,454 in federal taxes.

Every taxpayer chooses between two approaches: the standard deduction (a flat amount set by the IRS based on your filing status) or itemized deductions (a list of specific qualifying expenses you actually paid). You get whichever is larger — but you cannot take both. The decision is purely mathematical: add up your itemizable expenses and compare them to the standard deduction. Take whichever number is bigger.

The Standard Deduction in 2025

The standard deduction is a fixed dollar amount that reduces your taxable income with no documentation required. You do not need receipts, calculations, or special forms. The amounts for 2025 are:

If you are 65 or older or blind, you receive an additional standard deduction of $1,600 (single or head of household) or $1,300 per qualifying spouse (married filing jointly). These additional amounts can push the standard deduction well above $30,000 for a married couple where both spouses are over 65.

What Qualifies as an Itemized Deduction

Itemized deductions require you to list specific expenses on Schedule A of your tax return. Here are the major categories and their rules.

State and Local Taxes (SALT) — Capped at $10,000

You can deduct state income taxes (or state sales taxes — you choose one but not both), local property taxes, and personal property taxes. The total is capped at $10,000 per return ($5,000 if married filing separately). This cap, introduced by the TCJA, is the single biggest reason many former itemizers now take the standard deduction. In high-tax states like New York, New Jersey, California, and Connecticut, taxpayers routinely exceed the $10,000 cap from property taxes alone.

Mortgage Interest

Interest paid on mortgage debt up to $750,000 (for loans originated after December 15, 2017) is deductible. For mortgages predating that date, the limit is $1 million. Home equity loan interest is deductible only if the loan was used to buy, build, or substantially improve the home securing the loan. Interest on a home equity loan used to pay credit card debt or fund a vacation is not deductible.

Charitable Contributions

Donations to qualified 501(c)(3) organizations are deductible if you itemize. Cash donations are deductible up to 60% of your adjusted gross income. Donated property (clothing, household items, vehicles) is deductible at fair market value. Donations above $250 require a written acknowledgment from the charity. Stock donations of appreciated securities avoid capital gains tax and provide a deduction at full market value — one of the most tax-efficient giving strategies available.

Medical and Dental Expenses

You can deduct medical and dental expenses that exceed 7.5% of your adjusted gross income. If your AGI is $80,000, only medical expenses above $6,000 qualify. This means you need substantial medical costs — major surgery, chronic illness management, significant dental work — for this deduction to provide value. Expenses covered by insurance do not count.

Casualty and Theft Losses

Since the TCJA, personal casualty losses are deductible only if they result from a federally declared disaster. The deduction is limited to the loss amount minus $100, minus 10% of your AGI. General theft or unreimbursed property damage no longer qualifies.

The Break-Even Analysis: When Itemizing Wins

The math is simple: if your total itemizable expenses exceed the standard deduction, itemize. If not, take the standard deduction. Here is a practical example for a married couple.

Example: Married Couple, $150,000 Income

Even with a mortgage and significant SALT, this couple falls short of the standard deduction by $2,500. Taking the standard deduction saves them more. Notice how the $10,000 SALT cap means they lose $4,000 in potential deductions ($14,000 in actual SALT paid, but only $10,000 counted). Without the SALT cap, they would be $1,500 above the standard deduction and should itemize.

Who Typically Benefits From Itemizing

• Homeowners with large mortgages in high-cost areas where mortgage interest alone exceeds $15,000 to $20,000 per year
• Generous charitable givers who donate more than $5,000 to $10,000 annually, especially those who donate appreciated stock
• People with extraordinary medical expenses — major surgeries, chronic conditions, long-term care — that push past the 7.5% AGI floor
• Taxpayers in high-tax states who hit the $10,000 SALT cap and have additional large deductions to stack on top
• Married couples where one spouse has high medical costs may benefit from filing separately to lower the 7.5% AGI threshold

The Bunching Strategy: Making Itemizing Work

If your itemizable expenses are close to but below the standard deduction, the bunching strategy can tip the balance. The idea is to accelerate two or more years of deductible expenses into a single year — itemize that year, then take the standard deduction in the alternate year.

How It Works

Instead of donating $5,000 to charity each year, you donate $10,000 every other year. In the "bunching" year, your itemized deductions are $5,000 higher, potentially pushing you over the standard deduction threshold. In the alternate year, you take the standard deduction and pay nothing extra.

Donor-Advised Funds

A donor-advised fund (DAF) makes bunching even more powerful. You contribute a large lump sum to the DAF — say, three to five years of planned charitable giving — and take the full deduction in the contribution year. Then you recommend grants from the DAF to your chosen charities over the following years. The charities receive steady support, and you get the tax benefit of a concentrated deduction.

Above-the-Line Deductions: Available to Everyone

Some deductions — called "above-the-line" or "adjustments to income" — reduce your adjusted gross income regardless of whether you itemize or take the standard deduction. These are available to all taxpayers and can be stacked on top of either approach.

• Traditional IRA contributions (up to $7,000, or $8,000 if 50+, subject to income limits if covered by a workplace plan)
• HSA contributions ($4,300 individual, $8,550 family in 2025)
• Student loan interest (up to $2,500)
• Self-employment tax (the employer-equivalent portion — 50% of SE tax)
• Educator expenses (up to $300 for K-12 teachers)

These deductions are especially valuable because they also reduce your AGI, which can affect eligibility for other tax benefits, credits, and deductions that phase out at higher AGI levels.

What Happens If the Standard Deduction Shrinks?

The TCJA provisions that nearly doubled the standard deduction and imposed the $10,000 SALT cap are scheduled to expire after 2025. If Congress does not extend them, the 2026 standard deduction would revert to roughly $8,300 for single filers and $16,600 for married couples (adjusted for inflation from pre-TCJA levels). Simultaneously, the SALT cap would be removed.

If that happens, the calculus shifts dramatically. Millions of taxpayers who currently take the standard deduction would benefit from itemizing again — especially homeowners in high-tax states. This is one of the most significant pending tax policy changes to watch.

Frequently Asked Questions