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Nobody starts a private foundation because they’re excited about tax law. They start one because they care about something and want to put real resources behind it. But here’s the thing: if you don’t understand how the IRS treats private foundations, you can end up paying penalties that eat into the very dollars you intended for charity. The tax rules aren’t intuitive, and some of them will surprise you even if you’ve been doing sophisticated financial planning for years.
So let’s get into it.
Photo by Nataliya Vaitkevich on Pexels
Your Tax Deduction Has a Ceiling
You’ll get an income tax deduction when you contribute to your private foundation, which is one of the immediate financial benefits of setting one up. But the IRS doesn’t treat that deduction the same way it would if you gave directly to a public charity.
For cash, you can deduct up to 30% of your adjusted gross income. If you gave that same cash to a public charity or a Donor Advised Fund, the ceiling would be 60%. That’s a meaningful gap, especially for donors making large contributions in a single year. For appreciated assets like real estate or closely held stock, the limit drops further to 20% of AGI, and the deduction is often limited to your cost basis rather than the current fair market value.
There’s a notable exception worth knowing about. If you donate publicly traded stock that you’ve held for over a year, you can generally deduct the full fair market value, though still subject to that 20% cap. That makes long-held stock one of the smarter assets to move into a foundation from a tax perspective.
According to Crewe Foundation Services, a private foundation management firm that specializes in the establishment and administration of foundations, private foundations offer families and individuals several benefits, including income tax deductions, capital gain tax bypass, and estate tax bypass. The key is understanding how to structure contributions to capture those benefits efficiently.
If your deduction exceeds what you can use in the current year, you’re not out of luck. The IRS allows you to carry the excess forward for up to five additional tax years. That gives you room to make a larger initial gift without losing the tax benefit entirely.
The Excise Tax Nobody Warns You About
This one catches a lot of people off guard. Private foundations pay an excise tax on their net investment income. That includes interest, dividends, capital gains, and rental income generated inside the foundation’s portfolio.
The current rate sits at 1.39%. On its own, that doesn’t sound like much. But run the math on a large endowment over ten or twenty years, and it becomes a real cost of doing business. It’s also a cost that public charities and DAFs don’t pay at all, so it’s something to weigh when you’re deciding which charitable vehicle makes sense for your situation.
The foundation itself is responsible for this tax, reported annually on Form 990-PF. Depending on the size of the portfolio, you may also need to make estimated payments throughout the year.
The 5% Payout Requirement Is Non-Negotiable
Every year, your private foundation must distribute at least 5% of the average fair market value of its non-charitable-use assets for qualifying charitable purposes. That can include grants to nonprofits, expenses tied to direct charitable activity, and certain administrative costs related to carrying out the foundation’s mission.
Miss this requirement, and the consequences are steep. The initial penalty is 30% of whatever amount you should have distributed but didn’t. If you still haven’t corrected the shortfall within the prescribed window, it jumps to 100%. The IRS has strict rules around self-dealing, minimum distribution requirements of 5% of assets annually, and allowable expenses, and as Crewe Foundation Services notes, without professional management, even well-intentioned foundations can face legal and financial consequences.
Worth mentioning: 5% is a floor, not a target. Plenty of foundations distribute more than the minimum, especially when the cause is urgent or the endowment has grown beyond expectations. There’s no penalty for being generous.
Self-Dealing Is Where Foundations Get Into Trouble
Of all the rules governing private foundations, the self-dealing provisions are probably the most dangerous because they don’t care about your intentions. The IRS prohibits certain transactions between the foundation and its “disqualified persons,” a category that includes the foundation’s substantial contributors, managers, their family members, and entities they control.
Prohibited transactions cover a wide range of activity: selling, leasing, or exchanging property between the foundation and a disqualified person; lending money in either direction; providing goods, services, or facilities; and paying unreasonable compensation. Even transactions that seem perfectly innocent or beneficial to the foundation can trigger penalties.
And the penalties are substantial. The disqualified person faces a 10% tax on the amount involved. Any foundation manager who knowingly participated gets hit with a 5% tax. Fail to unwind the transaction, and the numbers escalate dramatically, to 200% and 50% respectively.
The reason this area is so hazardous is that good faith isn’t a defense. An accidental violation counts the same as a deliberate one. This is where having qualified legal counsel isn’t a nice-to-have. It’s a necessity.
Watch What You Spend On
Beyond self-dealing, the IRS also monitors how foundations spend their money through what it calls “taxable expenditure” rules. Certain categories of spending trigger penalty taxes: grants to individuals that don’t follow approved IRS procedures, lobbying expenses, grants to non-public charities without proper expenditure responsibility, and any spending that doesn’t further the foundation’s exempt purpose.
The penalty structure here is a 20% tax on the foundation for the expenditure, plus 5% on any manager who approved it, knowing it was problematic. Repeat offenders can face loss of tax-exempt status altogether, which would effectively end the foundation.
Unrelated Business Income Can Sneak Up On You
While foundations are generally tax-exempt, they can still owe taxes on income from activities unrelated to their charitable mission. This is called Unrelated Business Income Tax, or UBIT, and it shows up most often when a foundation operates a business, receives income from debt-financed property, or participates in certain partnership arrangements. UBIT is taxed at the standard corporate rate, so it’s worth paying attention to if your foundation’s activities go beyond traditional grantmaking.
Getting This Right Matters
None of these rules should scare you away from starting a private foundation. But they should convince you to take the administrative side seriously from day one. The tax landscape is complex, the penalties for mistakes are real, and the IRS doesn’t grade on a curve.
Work with advisors who know this space. Stay on top of your filings. Understand what you can and can’t do with foundation assets. When the compliance side is handled well, it fades into the background, and you’re free to focus on the reason you started the foundation in the first place.
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