From 1 January 2026 charitable contributions are only deductible to the extent they exceed 0.5% of your adjusted gross income, and taxpayers in the 37% bracket see the tax value of their itemised deductions capped at 35 cents on the dollar. Both changes come from the One Big Beautiful Bill Act. Together they mean a donor with $2,000,000 of AGI now loses the deduction on the first $10,000 they give, and gets 35% rather than 37% of value on everything above it.
For high-net-worth donors this is not a reason to give less. It is a reason to give differently — in fewer, larger years rather than steady annual instalments, and with far more attention to what you give than most people currently pay. This guide sets out the mechanics of the charitable deduction changes 2026 brought in, the arithmetic at real income levels, and the additional complication that applies if you are an American living in the UK giving to British causes.
The charitable deduction changes 2026 introduced, in full
There are three separate changes, and they affect different taxpayers. Confusing them is the source of most of the bad advice circulating on this topic.
The first of the **charitable deduction changes 2026** brought in is a floor. Under new section 170(p), an itemiser's contributions are deductible only to the extent the total exceeds 0.5% of their contribution base, broadly adjusted gross income. Give $10,000 on $250,000 of AGI and the first $1,250 is simply lost.
The second is a cap on value. The OBBBA permanently repealed the old Pease limitation and replaced it with a new limitation that reduces itemised deductions by 2/37ths of the lesser of the total itemised deductions or the taxable income in excess of the point at which the 37% bracket starts. The practical effect is that a top-bracket donor gets a 35% benefit rather than 37%.
The third runs the other way. For the first time since 2021, taxpayers who take the standard deduction can also deduct up to $1,000 of cash contributions, or $2,000 for a married couple filing jointly, above the line. The IRS sets out the underlying rules on qualifying organisations and substantiation in Publication 526, Charitable Contributions.
What the 0.5% floor actually costs
The floor is a fixed haircut tied to income, not to giving. That makes it regressive in an unusual way: it costs the same in dollars whether you give a lot or a little, so it hurts modest, steady givers far more than large ones in proportional terms.
At representative income levels, the lost deduction is as follows — our charitable deduction calculator applies the floor, the AGI ceilings and the 2/37 cap to your own numbers:
- $250,000 AGI: first $1,250 of giving is non-deductible
- $500,000 AGI: first $2,500 non-deductible
- $1,000,000 AGI: first $5,000 non-deductible
- $2,000,000 AGI: first $10,000 non-deductible
- $5,000,000 AGI: first $25,000 non-deductible
Why bunching went from clever to close to essential
Because the floor is charged annually, it is charged every year you give. A donor giving $25,000 a year on $1,000,000 of AGI loses $5,000 of deduction each year — $25,000 across five years. The same donor giving $125,000 once every five years loses $5,000 once.
That is the entire case for bunching, and the floor has made it substantially stronger than it was under the previous rules. Concentrating several years of intended giving into a single tax year clears the floor once instead of five times, and it also helps you exceed the standard deduction — $16,100 single and $32,200 married filing jointly for 2026 — in the years you do give, while taking the standard deduction in the years you do not.
The obvious objection is that charities need predictable annual income, not lumpy five-year gifts. The donor-advised fund exists precisely to solve that: you take the deduction in the year you fund it and the fund makes grants on your normal annual schedule. The charity's cash flow is unchanged; your tax position improves materially.
The 35% cap and who it really hits
The new limitation only applies where taxable income exceeds the 37% bracket threshold — $640,600 for single filers and heads of household, and $768,700 for married couples filing jointly in 2026, confirmed in Revenue Procedure 2025-32.
Below those thresholds the cap is irrelevant. Above them, the reduction is 2/37ths of the lesser of your total itemised deductions or the amount of taxable income above the threshold, which is why it is often described as the 2/37 rule. A donor with $200,000 of itemised deductions and taxable income well above the threshold loses about $10,800 of deduction, worth roughly $4,000 of tax.
One consequence is worth flagging: because the cap applies to all itemised deductions and not just charitable ones, state and local taxes, mortgage interest and charitable gifts compete for the same reduced value. If you were already close to the threshold, the marginal value of an extra charitable dollar is now lower than the headline rate suggests.
Should you have accelerated into 2025?
Many advisers spent late 2025 telling clients to pull gifts forward into 2025, where there was no floor and the full 37% benefit was still available. That advice was correct, and if you took it, the position is banked.
If you did not, there is no retrospective fix — but neither is there a reason for regret at the scale some commentary implied. The difference between a 37% and 35% benefit on a $100,000 gift is $2,000. The floor at $1,000,000 of AGI costs $5,000 once. These are real numbers but they are second-order compared with getting the *asset* right, which is where far more value is routinely lost.
The forward-looking version of the same advice is to plan giving in multi-year blocks from here, and to fund those blocks with appreciated securities rather than cash.
Give appreciated stock, not cash
This is the single largest lever, and it is unchanged by the 2026 rules. Donating long-term appreciated securities directly to a public charity gives a deduction for full fair market value while permanently avoiding the capital gains tax on the appreciation. Selling first and donating the proceeds triggers the gain.
For a top-bracket taxpayer the difference is substantial. On $100,000 of stock with a $20,000 basis, selling first costs roughly $19,040 in federal capital gains tax and net investment income tax at 20% plus 3.8% on the $80,000 gain. Donating the shares directly avoids that entirely and still produces a $100,000 deduction — subject to the 30% of AGI ceiling that applies to gifts of appreciated capital gain property, rather than the 60% ceiling for cash.
The holding period matters. The asset must have been held more than one year to qualify for fair market value treatment; short-term appreciated property is deductible only at basis, which usually makes it the worst possible thing to give.
The AGI ceilings still apply on top
The floor and the cap sit alongside the long-standing percentage limits, they do not replace them. For 2026 the principal ceilings remain 60% of AGI for cash gifts to public charities, 30% for gifts of long-term appreciated capital gain property to public charities valued at fair market value, and 20% for gifts of appreciated property to certain private foundations.
Contributions that exceed the ceilings are not lost. They carry forward for up to five years, subject to the same limits in each carryforward year. What is new, and genuinely awkward, is the interaction between the carryforward and the annual floor — the floor bites each year against that year's contribution base, so a large carryforward being used down over several years meets a fresh floor in each of them.
The statutory ordering rules here are more intricate than any summary can capture, and the regulations remain thin. If you are giving at a level where the ceilings are in play, this is a modelling exercise rather than a rule-of-thumb exercise.
Qualified charitable distributions escape all of it
If you are 70½ or older, a qualified charitable distribution from an IRA remains the most efficient way to give in 2026 — because it is not a deduction at all.
A QCD transfers up to an inflation-adjusted annual limit directly from your IRA to a qualifying public charity. The distribution is excluded from gross income rather than deducted, which means it bypasses the 0.5% floor, bypasses the 2/37 cap, does not require you to itemise, and does not increase AGI. Because it does not increase AGI it also avoids the knock-on effects on Medicare premiums and on the thresholds for other income-tested items.
For anyone of QCD age who is giving to public charities, the QCD should generally be filled before any other giving vehicle is considered. Note that QCDs cannot be made to donor-advised funds or to most private foundations, which is the usual constraint. The IRS explains the conditions in its guidance on charitable contribution deductions, and for Americans in the UK the interaction with UK pension and drawdown rules is covered in our guide to US 401(k)s and IRAs for UK residents.
Private foundations versus donor-advised funds after 2026
The choice between a private foundation and a donor-advised fund has never turned solely on tax, but the 2026 changes shift the balance slightly towards the DAF for donors whose principal objective is efficient giving rather than perpetual family governance.
A DAF is a public charity for deduction purposes, so cash gifts fall under the 60% AGI ceiling and appreciated securities under the 30% ceiling at full fair market value. A private foundation attracts lower ceilings — 30% for cash and 20% for appreciated property — and gifts of most non-publicly-traded assets are deductible only at basis. Foundations also carry an excise tax on net investment income and a 5% annual distribution requirement.
Against that, a foundation gives control, the ability to employ family members on reasonable terms, and the ability to make grants a DAF sponsor may refuse. Many families run both: the foundation for governance and direct grantmaking, the DAF for bunching large deductions in high-income years.
Americans in the UK: the giving problem nobody warns you about
Here is the trap. A US citizen resident in the UK who donates to a British charity generally gets UK relief through Gift Aid and no US deduction at all, because the US charitable deduction is limited to gifts to organisations created or organised in the United States.
Give the same money to a US 501(c)(3) and you get a US deduction and no UK relief. Either way you are giving with one hand tied, and the higher your effective rate in the country you are missing, the more expensive the mistake becomes.
The US–UK income tax treaty provides limited relief in Article 21, allowing a US resident to treat certain contributions to UK charities as deductible against UK-source income, but the relief is narrow and does not solve the general case. In practice the workable answers are dual-qualified charities — organisations recognised in both jurisdictions — and transatlantic donor-advised funds structured so a single gift generates both a US deduction and UK Gift Aid. This is worth doing properly: for a UK higher rate taxpayer who is also a US filer, the combined relief on a correctly structured gift can approach half the amount given.
Gift Aid, higher rate relief and the UK side of the ledger
On the UK side, Gift Aid lets the charity reclaim basic rate tax on your donation, grossing a £100 gift up to £125. If you pay tax above the basic rate you claim the difference between your rate and the basic rate through your Self Assessment return — worth £25 on that £100 gift for a higher rate taxpayer and £31.25 for an additional rate taxpayer.
There is a condition that catches Americans in the UK regularly: you must have paid at least as much UK income tax or capital gains tax in the year as the charity will reclaim. A US citizen whose UK liability is small — because most of their income is US-source, or because they are claiming relief under the treaty — can find they have signed Gift Aid declarations they were not entitled to make, and HMRC will recover the shortfall from them personally.
Gift Aid payments also reduce adjusted net income, which is why they are a standard tool against the 60% effective marginal rate between £100,000 and £125,140. Our UK 60% tax trap calculator shows how much a charitable payment recovers in that band.
Substantiation: the rule that voids more deductions than any other
The 2026 changes do not alter the documentation requirements, and those requirements remain the most common reason a legitimate deduction is disallowed on audit.
Any single contribution of $250 or more requires a contemporaneous written acknowledgement from the charity, obtained before the earlier of the date you file the return or its due date including extensions. Non-cash gifts over $500 require Form 8283. Non-cash gifts over $5,000 generally require a qualified appraisal, though publicly traded securities are excluded from the appraisal requirement.
The courts have been unforgiving here. Deductions worth millions have been lost over an acknowledgement letter that omitted the statement that no goods or services were provided. If you are making a substantial gift, get the paperwork right at the time — it cannot be repaired later.
A practical plan for the rest of 2026
Pulling the threads together, the sensible response to the new rules for a high-net-worth donor is structural rather than reactive:
- Decide your total giving over a three to five year horizon, not year by year
- Concentrate it into fewer, larger years so the 0.5% floor is charged once rather than annually
- Fund a donor-advised fund in the bunched year so charities still receive steady annual support
- Give long-term appreciated securities rather than cash wherever possible
- If you are 70½ or older, fill the qualified charitable distribution first — it escapes both the floor and the cap
- If you live in the UK, confirm dual-qualified status before giving, and check you have enough UK tax paid to support any Gift Aid declaration
- Collect contemporaneous acknowledgements at the time of each gift of $250 or more
Where this leaves you
The 2026 rules make charitable giving modestly more expensive for high earners and considerably more sensitive to timing. Neither change is large enough to alter whether generous people give; both are large enough to change when and how they should.
For Americans living in the UK the domestic changes are, frankly, the smaller half of the problem. Giving to the wrong side of the Atlantic wastes far more relief than the 0.5% floor ever will, and it is a mistake that is entirely avoidable with a phone call before the gift rather than after it. TaxStone works with dual US/UK filers on exactly this — if you are planning a significant gift this year, contact us before the money moves.
