If you itemize and write a $1,000 check to your favorite charity in 2026, part of that gift is now worth nothing on your tax return. That is the practical shock of a quiet but powerful change tucked into the One Big Beautiful Bill Act (OBBBA): for tax years beginning after December 31, 2025, itemizers can only deduct charitable contributions to the extent they exceed 0.5% of adjusted gross income. The first half a percent vanishes. For a household with $200,000 of AGI, that is $1,000 of giving every year that no longer reduces taxable income.
That is just one piece. The same law also caps the value of itemized deductions at 35 cents on the dollar for taxpayers in the top 37% bracket, and creates a new 1% floor (with the existing 10% ceiling tightened) on corporate charitable contributions. Together, these provisions reshape the math of giving for nearly every itemizing donor and every C corporation in the country, starting with the 2026 tax year.
The good news: with a little planning, most donors can claw back most of the lost benefit. This guide walks through what changed, the new rules in plain English, worked examples at several income levels, and the three strategies that do the heaviest lifting: bunching, donor-advised funds, and qualified charitable distributions from IRAs.
What Changed in 2026
For tax years beginning on or after January 1, 2026, four interacting rules govern the deductibility of charitable gifts.
1. The 0.5% AGI Floor for Itemizers
New Section 170(b)(1)(L) allows charitable contributions only to the extent the total contributions for the year exceed 0.5% of the taxpayer's "contribution base," which is essentially AGI for most individuals. Below the floor: no deduction at all. Above the floor: the existing percentage-of-AGI limits (60% for cash to public charities, 30% for appreciated property, and so on) still apply, just stacked on top of the floor.
2. The 35% Cap on Top-Bracket Itemized Deductions
For taxpayers in the 37% bracket — single filers with taxable income above roughly $640,600 and joint filers above roughly $768,700 in 2026 — itemized deductions, including charitable gifts, are now worth a maximum of 35 cents per dollar. Mechanically, the reduction equals 2/37 of the lesser of total itemized deductions or the amount of taxable income that lands in the top bracket. A $100,000 deduction is still $100,000 on Schedule A, but it shaves only $35,000 off federal tax instead of $37,000.
3. The Above-the-Line Deduction for Non-Itemizers
A small but permanent consolation: starting in 2026, non-itemizers can deduct up to $1,000 ($2,000 for joint filers) of cash gifts to qualifying public charities directly on the return, without itemizing. This is separate from and not subject to the 0.5% floor.
4. The 1% Corporate Floor (and 10% Ceiling)
C corporations now face their own version of the floor. Under amended Section 170(b)(2)(A), corporate charitable contributions are deductible only to the extent they exceed 1% of taxable income, and not more than 10% of taxable income. A corporation with $1 million of taxable income loses the deduction on the first $10,000 of giving. Amounts below the 1% floor are permanently nondeductible unless the corporation also exceeds the 10% ceiling in the same year, in which case the disallowed amount can carry forward up to five years.
How the Floor Actually Works: Three Worked Examples
Run the numbers and the floor's bite varies dramatically by giving level, not just by income.
Example 1 — Steady annual donor. Maya and Daniel have $400,000 of AGI and give $4,000 a year in cash to their church, alma mater, and a food bank. The 0.5% floor is $2,000. Their deduction drops from $4,000 to $2,000. At a 32% marginal rate, the lost federal tax benefit is $640 per year. Over a decade, that is $6,400 in foregone savings on the same giving they were doing anyway.
Example 2 — Generous donor. Same couple, but they give $20,000. The floor still costs them $2,000 of deductibility. The remaining $18,000 is fully deductible (well under the 60% AGI ceiling for cash). The proportional hit is small: about 10% of their giving falls below the floor.
Example 3 — High-income, modest giver. A single attorney with $900,000 AGI gives $5,000 to charity. The 0.5% floor is $4,500. Only $500 is deductible, and because she sits in the 37% bracket, the 35% cap further limits the federal value of her itemized deductions. The combined effective deduction on that gift collapses to roughly $175.
The pattern is consistent: small, steady giving is hit hardest in percentage terms. Donors who concentrate gifts above the floor recover most of their pre-2026 deduction.
Strategy 1: Bunching (And Why Calendar Year Suddenly Matters)
"Bunching" means consolidating what you would have given over several years into a single tax year, so a much larger share of your giving clears the 0.5% floor and exceeds the standard deduction. The technique was already useful after the 2017 standard deduction roughly doubled; OBBBA makes it indispensable for itemizers.
The mechanic is simple. Instead of giving $5,000 every year, give $20,000 once every four years. In the bunched year you itemize and deduct (above the floor and within the AGI cap). In the off years you take the standard deduction (which, thanks to OBBBA, is permanently $15,750 single / $31,500 joint in 2026, indexed for inflation). The recurring 0.5% floor only applies in years you actually deduct — three out of four years it is a non-event.
Run that against Maya and Daniel's $400,000 AGI:
- Year 1 (bunched gift of $20,000). Floor: $2,000. Deductible: $18,000. Stacked with SALT, mortgage interest, and other itemized deductions, they easily clear the standard deduction.
- Years 2–4 (no gifts). They take the standard deduction. The floor never applies.
Total deductible over four years: $18,000. Compare with $4,000 a year × 4 years − ($2,000 floor × 4) = $8,000 deductible. Bunching more than doubles the deductible amount on the same total $20,000 of generosity.
The catch with bunching, of course, is that most donors do not want their charities to feel feast-or-famine. That is exactly the problem donor-advised funds solve.
Strategy 2: Donor-Advised Funds (DAFs)
A donor-advised fund is a charitable account held at a public-charity sponsor (a community foundation or a sponsor like Fidelity Charitable, Schwab Charitable, Vanguard Charitable, or Daffy). You contribute cash or appreciated assets to the DAF, claim the deduction in the year of the contribution, and then recommend grants out to qualifying 501(c)(3) charities over future years — months, years, or decades later. The money grows tax-free inside the fund in the meantime.
DAFs marry bunching with smooth annual giving. You make one large contribution to the DAF — bunched, big enough to clear the floor and beat the standard deduction — and then keep cutting checks (well, grant recommendations) to your usual charities at your usual cadence. Bookkeeping for the IRS happens in the year of funding; bookkeeping for the charities happens whenever you want.
Three practical points donors miss:
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Fund the DAF with appreciated stock or low-basis crypto when possible. You skip the capital gains tax on the appreciation, the deduction is based on fair market value (subject to the 30% AGI ceiling), and the charity ultimately receives the full value. This is the single largest tax-efficient lever in personal giving.
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DAFs work for one-time liquidity events. A business sale, RSU vest, or large bonus year is exactly when the bunching math is most powerful: high marginal rate, high AGI, large gift, deduction taken in the high-income year, grants made later in normal years.
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DAFs do not satisfy required minimum distributions (RMDs). A QCD from an IRA cannot be made to a DAF. If you are over 70½ and want to deploy IRA dollars, see the next strategy.
Strategy 3: Qualified Charitable Distributions (QCDs)
If you are 70½ or older with a traditional IRA, the qualified charitable distribution may be the most tax-efficient way to give in 2026. A QCD is a direct transfer from your IRA custodian to a qualifying public charity. The distribution is excluded from gross income entirely — it never lands on your 1040 as income, never raises your AGI, and never has to be deducted in the first place. The 0.5% floor is therefore irrelevant to a QCD, because there is no Schedule A deduction to floor.
Key 2026 parameters:
- Annual QCD limit per individual: $111,000 (indexed from $108,000 in 2025).
- Joint filers each get their own limit, so a married couple where both spouses are 70½ or older can move up to $222,000.
- QCDs count toward required minimum distributions for taxpayers age 73 and up, satisfying the RMD without driving up taxable income (which can otherwise push Medicare IRMAA brackets, increase taxation of Social Security, and trigger the Net Investment Income Tax).
- Recipient must be a public charity, not a DAF, supporting organization, or private non-operating foundation.
- Direct transfer is required — money that passes through your hands first does not count, even if you immediately write a check to charity.
For a retiree giving steady amounts each year, the QCD almost always beats the itemized route in 2026 because every dollar reduces AGI rather than chasing a deduction stuck behind a 0.5% floor. It also helps preserve eligibility for credits, deductions, and lower Medicare premiums that phase out as AGI rises.
Other Levers Worth Knowing
A few additional moves can help donors clear the floor or sidestep it:
- Give appreciated long-term assets, not cash. Same dollar of generosity, no capital gains tax, deduction at fair market value. Most donors who write cash checks are leaving real money on the table.
- Coordinate spouses. A married couple has one shared AGI and one shared 0.5% floor — there is no doubling. The strategy lever is bunching timing, not splitting between spouses.
- Watch carryforwards from 2025. Pre-2026 unused carryforwards are generally not subject to the new floor when used in later years (pending formal IRS guidance), so taxpayers with a large 2025 carryforward should burn it down before adding 2026 gifts on top.
- Front-load 2025 if possible. A 2025 contribution is deductible under the old rules — no 0.5% floor, no 35% cap. Donors with the cash to give now should consider accelerating planned 2026 gifts into the 2025 calendar year, particularly if they are in or near the top bracket.
- For C corporations, watch the 1%–10% band. Below 1% of taxable income, gifts are permanently lost. Right at the ceiling, plan for carryforward years. Corporate giving programs should be sized to clear the floor every year that the company is profitable.
Documentation: What You'll Need to Prove
The 0.5% floor makes contemporaneous recordkeeping more important, not less. To support a deduction, the IRS expects:
- A bank record (cancelled check, credit card statement, or written acknowledgment from the charity) for every cash gift, plus a contemporaneous written acknowledgment from the charity for any single gift of $250 or more.
- A qualified appraisal for non-cash gifts above $5,000 (other than publicly traded securities).
- For QCDs, a 1099-R from your IRA custodian and an acknowledgment letter from the charity stating that no goods or services were received.
- For DAF contributions, the sponsor's acknowledgment letter, plus your own records of fair market value if you contributed appreciated assets.
- A running annual tally of AGI and total giving, so you can show the 0.5% floor calculation if questioned.
Donors who give to multiple charities, in multiple forms (cash, stock, DAF, QCD), in multiple tax years will benefit from a single source of truth — a ledger that records every gift with date, amount, vehicle, recipient, and supporting documents. The IRS does not give partial credit for vague summaries.
Keep Your Giving Records Audit-Ready
The 0.5% floor, the 35% cap, and the 1% corporate floor all reward donors who can prove exactly when, how, and how much they gave — and who can model the marginal value of the next gift before they write the check. Beancount.io is plain-text, version-controlled accounting that gives you complete transparency over your charitable giving, your DAF contributions, your QCDs, and the AGI calculations that drive them. No black boxes, no vendor lock-in, no surprise spreadsheet at year end. Get started for free and see why developers, finance professionals, and serious philanthropists are switching to plain-text accounting.