The 5% foundation payout floor is now a client audit trigger

The number to bring to a foundation client's next review is 5.1%, the average 2024 payout across the 144 private foundations with endowments over $1 billion in a Tuesday report from the Charity Reform Initiative at the Institute for Policy Studies. That sits a hair above the 5% of investment assets that Section 4942 of the Internal Revenue Code requires a private non-operating foundation to distribute each year to avoid heavy excise taxes.

The report's own framing is policy: the biggest funders, it argues, treat the statutory floor as a ceiling and clear it by as little as they can. Bella DeVaan, the initiative's director and a co-author, said modestly higher payouts "could unleash hundreds of billions of dollars for our common good." Whether Congress moves the floor is a separate question from whether a client's paperwork survives a look.

Advisors with private foundation clients can put the same data to work as a diagnostic this fall, because the 5% test is arithmetic—qualifying distributions measured against the fair market value of the foundation's investment assets, year by year—and the denominator is where clients drift. Aggregate foundation market returns ran an estimated 12% in 2024 and 7.2% over the past five years, per FoundationMark, which means a grant budget renewed in flat dollars shrinks as a share of a growing asset base. A client who cleared the line comfortably two years ago need not clear it next year, and no one has to decide to give less for that to happen.

Precedent cuts the same way. The Lilly Endowment, the largest private foundation, paid out 3% in 2024 and 3.4% in 2023 before reaching 5% in 2025 for the first time since 2009, a stretch in which its assets more than doubled on the strength of parent Eli Lilly's GLP-1 franchise; Bloomberg News reported the endowment was the first to reach a $100 billion valuation. That is the drift in its purest form: asset growth outrunning grantmaking with no decision behind it.

The report estimates that had the 121 billion-dollar-plus foundations that paid out less than 10% been required to distribute 10% in 2024, they would have given an additional $23.4 billion. The same researchers put donor-advised funds and foundations at 38% of all individual giving in the U.S., with assets across the two past $2 trillion this year.

The advisor deliverable is narrower than the report: a three-year payout ratio, computed against the right asset value, in hand before the year's grants are finalized. As this publication has argued, tax alpha has moved from harvesting to statutory repair, and the philanthropic balance sheet is one of the few places where the statute writes a hard line a client can miss without noticing. The 5% threshold is a tax provision, not a giving target, and a client who clears it by two-tenths of a point is one flat-grant year and one good market away from not clearing it at all.