The Alternative Minimum Tax affects charitable contributions less than almost any other itemized deduction. Charitable gifts are not an AMT adjustment item, so a donation that lowers your regular taxable income by $10,000 generally lowers your Alternative Minimum Taxable Income by the same $10,000. That treatment makes giving one of the few reliable levers left for taxpayers already caught by the AMT. Starting in 2026, however, two new provisions from the One Big Beautiful Bill Act trim the tax benefit of giving for higher earners, and because those changes flow through the regular tax into the AMT calculation, they change the math on both sides.
Why Charitable Gifts Survive the AMT
The AMT works by recalculating your tax after stripping out certain deductions. You start with regular taxable income, add back items like the state and local tax deduction, then apply a separate rate structure on Form 6251. If the resulting Tentative Minimum Tax exceeds your regular tax, you pay the difference.1Internal Revenue Service. 2025 Instructions for Form 6251 – Alternative Minimum Tax—Individuals
Charitable contributions never enter that add-back list. Whatever you deducted for the gift under the regular tax code stays deducted when you compute AMTI. For anyone already paying AMT, this matters. Most other itemized deductions have already been neutralized in the AMT column, so increasing charitable giving is one of the few moves that actually reduces the total tax owed.
The percentage-of-AGI ceilings that limit charitable deductions apply uniformly under both systems. Cash gifts to public charities are deductible up to 60% of AGI, a limit the new law made permanent. Long-term capital gain property to public charities is capped at 30% of AGI, and capital gain property to private foundations at 20%. Contributions above the ceiling carry forward for up to five years.2Internal Revenue Service. Publication 526, Charitable Contributions
One small wrinkle: because AMTI is usually higher than regular AGI (SALT and other items get added back), the same percentage can produce a slightly larger dollar deduction under the AMT column. The difference is generally minor, but it does mean your carryover amount can differ between the two systems, and you have to track each separately.
The 2026 Floor and Cap That Shrink the Benefit
Two provisions signed into law in mid-2025 change the value of giving beginning in 2026. Both apply to the regular tax first, then flow through to the AMT.
The first is a floor. Only charitable contributions above 0.5% of your AGI are deductible. On a $400,000 AGI, the first $2,000 of giving produces no deduction under either the regular tax or the AMT. The floor applies to all itemizers.
The second is a cap on the value of itemized deductions for taxpayers in the top bracket. If you’re in the 37% bracket, the benefit of your itemized deductions is limited to 35% of the deduction amount. A $10,000 charitable deduction that would have saved $3,700 now saves $3,500. Per dollar the reduction is small, but on large gifts it compounds.
Both provisions apply to carryovers as well. If you used your 60% AGI ceiling in an earlier year and are drawing down carryforward in 2026 or later, the floor and the cap still bite.
Donating Appreciated Property
Giving long-term capital gain property to a public charity remains one of the most tax-efficient ways to donate, and the treatment is identical under both tax systems. You deduct the full fair market value and pay no capital gains tax on the appreciation.2Internal Revenue Service. Publication 526, Charitable Contributions
Older tax guides sometimes still warn that the untaxed appreciation on donated property is an AMT preference item. It isn’t, and hasn’t been for decades. Congress repealed that preference under IRC §57(a)(6).3Office of the Law Revision Counsel. 26 U.S. Code 57 – Items of Tax Preference Today, donating $100,000 of stock you bought for $20,000 gives you a $100,000 deduction under both the regular tax and the AMT, subject to the 30% AGI ceiling and the new 0.5% floor.
Two boundary rules apply the same way under both systems and are worth flagging so you don’t get surprised. For most types of appreciated property other than publicly traded stock donated to a private non-operating foundation, the deduction is limited to your basis, not fair market value. And for tangible personal property such as art or collectibles, you get full fair market value only if the charity uses the item in a way related to its exempt purpose; otherwise the deduction drops to basis. Neither rule creates a separate AMT adjustment, but the dollar swing between fair market value and basis can be large.
Qualified Charitable Distributions Bypass the AMT Entirely
If you are 70½ or older with a traditional IRA, a Qualified Charitable Distribution is the cleanest AMT strategy available. A QCD is a direct transfer from your IRA to a qualified charity, and the transferred amount is excluded from your gross income rather than taken as a deduction.4Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living
Because the money never enters your AGI, it never enters your AMTI. It also sits outside the new 0.5% floor and the 35% deduction cap, since both apply to itemized deductions and a QCD isn’t one. For 2026, you can move up to $111,000 through QCDs, with an additional one-time option to direct up to $55,000 to a charitable remainder trust or charitable gift annuity.4Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living
QCDs also satisfy required minimum distributions. For a retiree already flirting with AMT, redirecting giving from a personal check to a QCD lowers AMTI enough in many cases to reduce or eliminate the AMT liability.
Bunching Gifts to Clear the New Floor
The 0.5% AGI floor punishes routine smaller giving. Concentrating several years of donations into one tax year is one way to fight back. Instead of $5,000 a year for three years, you give $15,000 in year one and take the standard deduction in years two and three. The single larger gift clears the floor by a wider margin, and the aggregate deduction across the three years is higher.
A donor-advised fund makes bunching practical. You contribute a lump sum, take the full deduction in the contribution year, and then recommend grants to individual charities over time. Because the sponsoring organization is itself a public charity, your gift qualifies for the 60% and 30% AGI ceilings and the same AMT treatment as a direct gift.
Bunching becomes especially useful in a year that already triggers AMT exposure, such as one in which you exercise incentive stock options or realize a large capital gain. A concentrated charitable gift in that same year can pull AMTI back below the exemption phase-out threshold, which for 2026 starts at $500,000 for single filers and $1,000,000 for joint filers.5Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill Every dollar of AMTI above those thresholds erases 25 cents of your AMT exemption, so a well-timed contribution reduces taxable income directly and preserves more of the exemption.
Where the Charitable Deduction Sits in the AMT Calculation
Running through the 2026 calculation makes the placement concrete. Start with regular taxable income. Add back AMT adjustment items: the state and local tax deduction (now capped at $40,000 and phasing down above $500,000 of income) and any other disallowed deductions. Your charitable contribution stays in the calculation, reduced only by the 0.5% AGI floor and the applicable AGI percentage ceilings. The result is your AMTI.
Subtract the AMT exemption. For 2026 that is $90,100 for single filers and $140,200 for joint filers, phasing out at the thresholds mentioned above.5Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill Apply the AMT rates: 26% on the first $244,500 and 28% above. That produces your Tentative Minimum Tax. Compare it to your regular tax. If the tentative minimum is higher, you pay your regular tax plus the difference; if not, you owe no AMT.1Internal Revenue Service. 2025 Instructions for Form 6251 – Alternative Minimum Tax—Individuals
The charitable deduction sits inside AMTI on the same footing it holds in regular taxable income. That is the whole answer to how AMT affects your giving: it mostly doesn’t, and where the new 2026 rules do reduce the benefit, they reduce it equally under both systems rather than singling out the AMT column.