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Charitable Bunching Calculator

2026 itemizing rules · reviewed September 6, 2026

Compares giving to charity a little every year with giving several years' worth at once, to see which saves more tax. About

In plain words. Charitable gifts lower your tax only if you itemize deductions instead of taking the standard deduction, and many people who give steadily never reach that line. Bunching means giving two or three years of gifts in one year, often into a donor-advised fund that passes them on to charities on your usual schedule, so that year itemizes and the others take the standard deduction. This tool runs both patterns with your income, your state and local taxes, and your mortgage interest, under the rules that took effect this year.

Why it matters. The charities receive the same money either way. The only thing that changes is how much of it the tax code notices, and for a steady giver the difference over a few years can be thousands of dollars.

An example. A couple with $200,000 of income, $12,000 of state and local taxes, and $15,000 of gifts a year never itemizes when giving yearly. Giving two years' gifts at once, they itemize $41,000 in the gift year and take the standard deduction the next, saving about $1,050 over the pair of years.

Where it stops. It uses federal brackets only and holds this year's rules constant. It ignores state tax, gifts of appreciated stock (which have their own limit and advantage), the 35 percent cap for top-bracket filers, and whether a donor-advised fund suits you. Everything it leaves out.

$

Adjusted gross income, which is line 11 of your Form 1040. The tool uses the same figure every year.

What you normally give in a year, by cash, check, or card.

Given in one year to a donor-advised fund, a charitable account you deduct when you fund it and that pays your charities on your usual schedule.

Property tax and state income tax together. At this income the law lets you deduct up to $40,400 of them.

Filing status
Age

At 65 or older the standard deduction is larger, so it is harder to beat.

Giving 2 years of gifts at once saves
$1,056
Giving $15,000 every year costs $51,800 in federal tax over 2 years. Giving $30,000 at once costs $50,744. Year by year, your $26,000 of deductions never beats the $32,200 standard deduction, so the gifts count only through the $2,000 deduction allowed to people who do not itemize. Given at once, the gift year deducts $41,000 and the other year takes the standard deduction.
Your deduction each year, giving every year or giving 2 years at onceThree bars. Giving every year, the deduction is $34,200 each year. Giving at once, it is $41,000 in the gift year and $32,200 in each of the other years.$0$10k$20k$30k$40k$50k$34kEvery yearstandard$41kAt once, gift yearitemized$32kAt once, other yearsstandard
Total deductions over 2 years, giving at once
$73,200
Against $68,400 giving every year
Gifts that earn no deduction, in each year you give
$1,000
The first 0.5% of your income in gifts does not count, once per giving year
State and local taxes you can deduct
$12,000
Capped at $40,400, and the cap shrinks above $505,000 of income

The charities receive the same money on the same schedule. Only the timing of your deduction changes. Giving several years at once works best when your yearly deductions sit just under the standard deduction. Piling the gifts into one year then clears it by a wide margin, and the other years lose nothing because they take the standard deduction anyway. It also means the first slice of gifts that earns no deduction is lost only once instead of every year. It works less well when you already itemize every year, and not at all when the gifts are small.

This uses the 2026 standard deduction, the extra amount at 65, the federal brackets from Rev. Proc. 2025-32, the cap on state and local tax deductions, the charitable floor, and the deduction allowed to people who do not itemize. It covers cash gifts to public charities only. It leaves out the lower deduction limit for top-bracket filers, gifts of stock or other property, medical and other itemized deductions, state tax, and the rule that gifts to a donor-advised fund do not qualify for the non-itemizer deduction. Educational, not advice.

This is a simplified model, not your actual tax return or plan. It only knows what you type in, leaves out rules that may apply to you, and cannot weigh the other facts and trade-offs a real decision depends on. Before you act, talk with a professional who knows your whole situation.

Educational only, not investment, tax, or legal advice. Results are hypothetical estimates that vary with each use and over time and are not guaranteed accurate or complete. Using this tool creates no client relationship with Considerate Capital, and the site that linked here is not affiliated with it. By using it you agree to the tool terms.