Charitable Contribution Deduction

The charitable contribution deduction allows a taxpayer to subtract gifts to qualifying organizations from taxable income. Internal Revenue Code section 170 is headed "Charitable, etc., contributions and gifts", and it does four things: it defines which organizations qualify, it limits the deduction to a percentage of income that varies by donee and by the kind of property given, it imposes substantiation requirements that are strict enough to defeat an otherwise genuine gift, and since 2026 it applies a floor before any of the rest of it matters.

For almost everyone this is an itemized deduction, claimed on Schedule A instead of the standard deduction. The exception, new for tax years beginning after 2025, is section 170(p), which gives a taxpayer who does not itemize a deduction of up to $1,000, or $2,000 on a joint return, for cash gifts to public charities.

Who counts as a donee. Section 170(c) lists the qualifying recipients, and the practical filter is that the organization is a domestic entity organized for charitable, religious, educational, scientific or similar purposes, or a government unit accepting the gift for public purposes. A gift to a specific individual is not deductible no matter how the money is used, which is what makes most personal fundraising appeals non-deductible. The IRS's Tax Exempt Organization Search on IRS.gov is the place to check a particular organization.

The floor, which is new. Section 170(b)(1)(I), effective for tax years beginning after December 31, 2025, allows an itemizer's contributions "only to the extent that the aggregate of such contributions exceeds 0.5 percent of the taxpayer's contribution base for the taxable year". Contribution base is defined at 170(b)(1)(H) as adjusted gross income computed without regard to any net operating loss carryback. The floor bites the whole of an itemizer's giving, not each gift, and the statute prescribes a six-step order in which the disallowance is applied across the different categories of contribution.

The asymmetry between the floor and the ceilings, which is the part worth knowing. An amount disallowed because it exceeded a percentage ceiling carries forward for five succeeding years under section 170(d)(1)(A). An amount disallowed by the floor is treated far less generously: section 170(d)(1)(C), read at source, increases a carryforward by the floor-disallowed amount only for a year from which an excess is already being carried forward under one of the percentage-ceiling rules. So a donor whose giving sits comfortably below every ceiling, and therefore has no carryforward at all, loses the floor amount outright. Reading "amounts above the limit carry forward" and then meeting the floor in the next sentence is exactly how this gets misunderstood.

The ceilings. Cash to public charities is allowed up to 60% of the contribution base under 170(b)(1)(G)(i), a limit the 2025 tax law made permanent by striking the sunset that used to sit in it. Appreciated capital-gain property given to a public charity is capped at 30% under 170(b)(1)(C). Gifts to organizations that are not public charities, chiefly private foundations, run on their own lower limits: generally 30% under 170(b)(1)(B) and 20% for appreciated capital-gain property under 170(b)(1)(D). The exact ceiling therefore depends on both what you gave and who received it, and the categories are applied in a set order rather than simply added together.

A private foundation changes the amount as well as the ceiling, which is easy to miss. Section 170(e)(1)(B)(ii) reduces the deduction for property given to or for the use of a private foundation by the gain that would have been long-term capital gain on a sale, which in practice means the deduction is the donor's cost basis rather than the market value. The narrow exception at section 170(e)(5) is qualified appreciated stock, broadly publicly traded securities. So the familiar advice to give appreciated shares rather than cash is a public-charity strategy: pointed at a private foundation it can deduct far less than the shares are worth, against a lower ceiling as well.

Substantiation defeats more deductions than the arithmetic does. Section 170(f)(17) denies any deduction for a cash, check or other monetary gift unless the donor keeps a bank record or a written communication from the charity showing its name, the date and the amount, so a cash gift in a collection plate with no record is not deductible at any size. On top of that, section 170(f)(8) denies a deduction for any single contribution of $250 or more without a contemporaneous written acknowledgment from the charity stating the amount, whether goods or services were provided in return, and a good-faith estimate of their value. "Contemporaneous" means obtained by the earlier of the date you file or the due date including extensions, so an acknowledgment chased up during an audit is worthless. And where you received something in return, only the excess of your payment over the value of what you received is a contribution.

The non-itemizer deduction. Section 170(p) is narrower than its headline. It reaches cash only, given to a section 170(b)(1)(A) organization, and it expressly excludes gifts to a section 509(a)(3) supporting organization and gifts for the establishment or maintenance of a donor-advised fund. It is computed without regard to the 0.5% floor and without the carryforward rules. The $1,000 and $2,000 amounts are fixed statutory figures with no inflation adjustment, so they will not appear in any annual Revenue Procedure and will not move on their own.

Gifts are totaled for the year, sorted into categories by donee and property type, reduced by the 0.5% floor, then tested against the applicable percentage ceilings, with any ceiling excess carried into the next five years. Non-cash gifts add valuation and reporting steps of their own, which is a separate subject.

A hypothetical on the floor. Amara's contribution base is $200,000 and she gives $6,000 in cash to public charities during the year. The floor is 0.5% of $200,000, which is $1,000. Her deduction is therefore $5,000, and because $6,000 is nowhere near the 60% ceiling of $120,000 she has no carryforward for the lost $1,000 to attach to. That $1,000 is simply gone.

A hypothetical on substantiation. In the same year Amara made one gift of $400 to a food bank and a series of smaller gifts. The $400 gift needs a contemporaneous written acknowledgment from the food bank, because it is $250 or more on its own. The smaller gifts do not need an acknowledgment, but every one of them still needs a bank record or a written communication from the charity, so anything given in cash with no receipt is out.

Pros

• Reduces taxable income at the donor's marginal rate for gifts they were going to make anyway.
• The 60% ceiling for cash to public charities is permanent, so a large one-year gift is not fighting a sunset.
• Excess above a ceiling is not lost. It carries forward five years.
• Non-itemizers get something from 2026 onward, which was not true from 2022 through 2025.
• Giving appreciated property to a public charity rather than cash can avoid the tax on the built-in gain as well, subject to its own lower ceiling.

Cons

• Most taxpayers take the standard deduction, so most gifts produce no itemized deduction at all.
• The 0.5% floor removes the first slice of every itemizer's giving each year, and that slice generally cannot be carried forward.
• A missing acknowledgment defeats a gift entirely. The rule is all-or-nothing, not a haircut.
• Ceilings vary by donee and property type, so the same $10,000 gift can be fully deductible or only partly deductible depending on where it went.
• Appreciated property given to a private foundation is generally deductible at cost basis rather than market value, and against a lower ceiling.
• The non-itemizer deduction is fixed in dollars, cash only, and excludes donor-advised funds and supporting organizations.
• Gifts to individuals, political organizations and most crowdfunding appeals are not deductible at all.