Standard vs. Itemized Deduction Calculator
Not sure whether to take the standard deduction or itemize on Schedule A? Enter your state and local taxes, mortgage interest, charitable giving, and medical expenses below. This calculator adds up your itemizable expenses using the official 2025 limits — the $40,000 SALT cap, the 7.5%-of-AGI medical floor, and the 60%-of-AGI charitable cash cap — and compares the total with your standard deduction, so you can see which one actually saves you more tax.
Your itemizable expenses (Schedule A)
How your itemized total is built
| Category | You paid | Deductible | Why |
|---|
How the comparison works
Every filer gets to choose the larger of two numbers: the standard deduction — a fixed amount set by filing status ($15,750 single, $31,500 married filing jointly, or $23,625 head of household for 2025) — or the sum of specific expenses reported on Schedule A. This tool totals the most common Schedule A categories under their official 2025 limits, then compares that total with your standard deduction. Whichever number is larger becomes your deduction, and the calculator also estimates the actual dollar tax savings from itemizing versus taking the standard deduction, using the same IRS bracket math as our income tax and refund calculators.
The 2025 limits that matter most
State and local taxes (SALT): the deduction for state income or sales tax plus property tax is capped at $40,000 for most filers ($20,000 if married filing separately), a limit set by the One Big Beautiful Bill Act. If you paid more than the cap, only the capped amount counts here — the rest isn't deductible at all, unlike a carryover.
Medical expenses: only unreimbursed medical and dental costs above 7.5% of your AGI are deductible. On an AGI of $80,000, the first $6,000 of medical bills is excluded; only the amount above that floor helps you.
Charitable cash gifts: deductible up to 60% of your AGI when given to a qualifying public charity, a limit made permanent by the One Big Beautiful Bill Act. Gifts above that cap generally carry forward up to five years rather than being lost.
Mortgage interest on qualifying acquisition debt is generally deductible in full up to the loan-balance limits ($750,000 for loans taken out after December 15, 2017); this tool assumes your entered amount already reflects those limits, since most homeowners' mortgages fall well under the cap.
Reading your result
The four cards summarize the decision: which deduction is larger, your itemized total, the 2025 standard deduction for your filing status, and the tax you would save by itemizing instead of taking the standard deduction. The table below breaks down exactly how each category was capped or floored, so you can see precisely why an expense did or didn't count in full — which matters most for SALT and medical expenses, where the deductible amount is often smaller than what you actually paid.
What this estimate does not include
This is an educational estimate covering the most common Schedule A categories. It does not model casualty and theft losses, gambling-loss limits beyond winnings, donations of appreciated property (stock, art, or other assets, which are capped differently than cash), detailed mortgage acquisition-debt tracing, or state-specific rules. High earners near the SALT phase-out threshold ($500,000 MAGI, $250,000 if married filing separately) should also note the cap can be reduced further, which this tool does not calculate. Use tax software or a qualified preparer to confirm your actual Schedule A.
Go deeper: deductions, credits, and your return
- A Practical Guide to Tax Deductions — every major deduction category explained in plain terms.
- Standard vs. Itemized: The Full Decision Guide — the qualitative case for each choice.
- A Practical Guide to Tax Credits — credits reduce tax directly and stack on top of your deduction choice.
- 2025 Tax Refund Calculator — see your refund or balance due after choosing your deduction.
- 2025 Income Tax Calculator — full bracket-by-bracket tax and effective-rate breakdown.
This calculator provides a general educational estimate comparing the 2025 standard deduction with common itemized deductions under official IRS limits. It is not tax, legal, or financial advice, and it excludes casualty losses, property donations, and detailed mortgage-debt tracing. Consult a qualified professional before filing.