DAFs and the OBBBA: What the New Tax Law Changed for High-Net-Worth Givers
- J.T. Hardcastle
- Jun 29
- 5 min read
Updated: Aug 10
For most of the last decade, the rules for charitable giving sat still. You gave, you itemized, you deducted. Starting in 2026, that quiet stretch is over. The One Big Beautiful Bill Act rewrote several pieces of the charitable arithmetic at once, and while none of the changes are dramatic on their own, together they reward planning and punish autopilot.
If you give at a high level — and especially if you give through a donor advised fund — these are the changes worth understanding. None of them should make you give less. A few of them should change how you give. Here's what the OBBBA actually did, and what to do about it.
The 0.5% floor: the change that touches everyone who itemizes
The headline change is a new floor. Beginning in 2026, itemizers can only deduct the portion of their charitable giving that exceeds 0.5% of adjusted gross income. The first half-percent produces no deduction at all.
The math is easy to see. On $400,000 of income, the first $2,000 of giving no longer counts. On $1,000,000 of income, it's the first $5,000. The dollar amounts are modest, but there's a sting in the structure: if you give the same amount every year, you cross that floor every year, losing a slice each time.
Consider how that compounds. A couple with $600,000 of income who gives $30,000 every year loses the deduction on the first $3,000 annually. Over five years of steady giving, that's $15,000 of contributions that produced no tax benefit at all — money given, but invisible to the deduction. Bundle those five years into a single $150,000 gift, and the floor takes its bite only once, on $3,000, leaving the other $147,000 fully in play.
This is the rule that makes concentration pay. Push several years of giving into one year — through a single large contribution to a donor advised fund — and you clear the floor once instead of repeatedly. It's the same instinct now reshaping how many high-net-worth families give: give on purpose, in fewer and larger moves.
The 35% cap for top earners
The second change is quieter and aimed squarely at the highest bracket. For donors in the 37% bracket, the OBBBA caps the value of each deducted charitable dollar at 35 cents, rather than the 37 cents that bracket would otherwise imply.
On a single year of normal giving, the difference is small. On a large, concentrated gift, it adds up — and it strengthens the case for funding gifts with appreciated assets rather than cash. When you give appreciated stock, the capital gains tax you avoid often dwarfs the two-cent trim on the deduction, which is part of why pairing a DAF with other assets has become a more common move, not a less common one.
A new break for non-itemizers — with a catch
Not every change tightens the rules. The OBBBA also created a new above-the-line deduction for people who don't itemize: up to $1,000 for single filers and $2,000 for married couples, available even if you take the standard deduction.
There's an important catch for DAF users. This non-itemizer deduction is limited to direct cash gifts to operating charities, and contributions into a donor advised fund don't qualify for it. So if your giving runs through a DAF, this particular break isn't yours to use — but it's worth knowing about for smaller, direct gifts you or your family members make outside the fund.
The corporate floor, for business owners
One more change matters if you give through a company. A corporation now has to give at least 1% of taxable income before any charitable deduction is allowed, and the existing 10% ceiling still applies on the top end. Business owners who run charitable giving through a C-corporation should coordinate the timing of those gifts with their advisor, because small annual amounts may now fall below the threshold and produce no deduction.
Who feels these changes most
The OBBBA doesn't land evenly. It helps to know which group you're in before you plan around it.
Steady, mid-level givers who take the standard deduction are barely touched by the floor or the cap — and the new non-itemizer break may actually help them on direct gifts. The donors who feel the changes most are high earners who itemize and give significant amounts every year. For them, the 0.5% floor quietly trims each annual gift, the 35% cap shaves the top off large deductions, and steady year-after-year giving slowly leaks value it used to keep.
That's not a reason to retreat. It's a reason to reorganize. The same donor who loses a little by giving the same amount every year gains it all back by giving in fewer, larger, better-timed moves. The law essentially rewards the donors who treat giving as a plan and gently penalizes the ones who treat it as a reflex.
How to model your 2026 giving
You don't need a tax degree to get ahead of this. A short checklist covers most of it. Estimate your adjusted gross income for the year and multiply by 0.5% so you know your floor. Add up the deductions you'll have regardless — state taxes, mortgage interest — and see how far they sit from the standard deduction. Then decide whether this is a year to bunch several years of giving into one, and whether you can fund that gift with appreciated assets rather than cash. Run those four numbers and the right move usually becomes obvious.
Modeling the new floor, the cap, and your AGI limits against your real income is exactly the kind of thing worth doing before year-end, not after. Our DAF calculator runs it on your own numbers in a couple of minutes.
See how the 2026 rules change your giving — run it in the DAF Calculator.
What it all means for your DAF strategy
Step back from the individual rules and a single theme emerges: scattered, year-after-year giving lost a little efficiency, and concentrated, intentional giving kept all of it. The donor advised fund is the tool that makes concentration simple.
Three moves follow naturally from the new law. Bunch several years of gifts into one DAF contribution so you clear the 0.5% floor once and itemize in a year it counts. Fund those gifts with appreciated stock, real estate, or crypto so the avoided capital gains tax outweighs the modest deduction trim. And time your largest giving for high-income years, when the deduction is worth the most against your top-bracket income. None of this requires giving more. It only requires giving deliberately — which, conveniently, is what a DAF was built for.
Put the three together and the effect is larger than any one of them. A donor who bunches five years of giving into a single high-income year, funds it with long-held appreciated stock, and routes it through a donor advised fund clears the floor once, deducts against top-bracket income, skips the capital gains tax on the shares, and still supports the same charities on the same schedule. The OBBBA trimmed a few cents here and added a small floor there. A coordinated plan more than makes up the difference — and leaves the donor giving with more intention than before. That same logic is why so many families now pair a DAF with other long-term assets rather than giving from cash each December.
The OBBBA didn't make generosity harder. It made thoughtless generosity a little more expensive and planned generosity a little more valuable. For donors already inclined to be intentional, that's not a hurdle. It's an invitation.
The new rules interact with your income, your assets, and your timing in ways a general article can't capture. The conversations that move people from "interesting idea" to "actual decision" happen one-on-one — your numbers, your values, an honest read.
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