Before your income hits the tax brackets, you subtract a deduction. You get to take the larger of two options: the flat standard deduction, or the total of your itemized deductions. Choosing correctly is one of the simplest ways to avoid overpaying — and since the 2017 tax law nearly doubled the standard deduction, the great majority of filers now come out ahead taking it.
2025 standard-deduction amounts
The 2025 One Big Beautiful Bill Act (P.L. 119-21) raised the standard deduction above the originally published inflation figures. For the 2025 tax year:
| Filing status | 2025 standard deduction |
|---|---|
| Single / married filing separately | $15,750 |
| Married filing jointly | $31,500 |
| Head of household | $23,625 |
Taxpayers who are 65 or older or blind get an additional standard-deduction amount on top of these. Verify the current figures at IRS.gov, because they change most years.
What counts as an itemized deduction?
Itemizing means listing specific deductible expenses on Schedule A instead of taking the flat amount. The main categories are:
- State and local taxes (SALT) — income (or sales) tax plus property tax. This deduction has been subject to a cap; the cap amount has changed under recent legislation, so confirm the current limit for your year.
- Mortgage interest — on acquisition debt up to the applicable principal limit for your loan.
- Charitable contributions — cash and the fair-market value of donated property, within income-based limits.
- Medical expenses — only the portion above 7.5% of your adjusted gross income.
You add these up. If the total beats your standard deduction, you itemize; if not, you take the standard deduction and skip the paperwork.
The bunching strategy
Because the standard deduction is high, many households fall just short of the threshold every year and never get any benefit from their charitable giving or other deductions. Bunching fixes that. Instead of donating (or paying deductible expenses) evenly each year, you concentrate two or more years' worth into a single year to clear the standard-deduction hurdle, itemize big that year, then take the standard deduction in the "off" years.
A donor-advised fund (DAF) makes this easy for charitable giving: you contribute a lump sum (ideally appreciated stock, which also avoids capital-gains tax), take the deduction now, and then recommend grants to charities over the following years. The charities still get a steady stream; you get a concentrated deduction.
Donate appreciated assets, not cash. Giving stock you have held more than a year lets you deduct the full market value and skip the capital-gains tax you would owe if you sold it first — a double benefit the cash-in-the-plate approach misses.
How much is a deduction actually worth?
A deduction reduces your taxable income, so its value equals the amount times your marginal tax rate — not the full amount. A $10,000 deduction saves someone in the 22% bracket about $2,200; someone in the 32% bracket saves about $3,200. This is different from a tax credit, which reduces your tax bill dollar-for-dollar and is generally more valuable per dollar. Deductions only help to the extent your itemized total exceeds the standard deduction, so the first dollars of itemizing effectively replace deduction you would have gotten for free.
For most filers the answer is simple: take the standard deduction. But homeowners in high-tax states, big charitable givers, and anyone with a high-medical-expense year should run the itemized total — and consider bunching to make those deductions count.