Updated July 28, 2026. Quick answer: The distribution deduction is capped at distributable net income. Distribute more than DNI and the excess produces no additional deduction and no additional income to the beneficiary — it is simply principal moving out of the trust. DNI is the ceiling on how much taxable income a distribution can shift, however large the cheque.
What DNI does
It performs two jobs at once: it caps the trust’s deduction under §651 or §661, and it caps the amount the beneficiary must include. The two are matched by design, so income is taxed once — either to the trust or to the beneficiary, not both and not neither.
| You distribute | Deduction | Beneficiary includes |
|---|---|---|
| Less than DNI | The amount distributed | The amount distributed |
| Exactly DNI | DNI | DNI |
| More than DNI | DNI — no more | DNI — the excess is tax-free principal |
Which is why a large distribution does not necessarily solve a trust’s tax problem. If the income is not in DNI, distributing cash does not move it. The clearest case is capital gains allocated to corpus, which are generally excluded from DNI and therefore stay taxed inside the trust no matter how much you distribute.
What follows for a trustee
Compute DNI before deciding the distribution, not after. A distribution sized to a beneficiary’s needs and a distribution sized to DNI are different numbers, and only one of them is doing tax work. Where they conflict, the beneficiary’s needs usually and rightly win — but the trustee should know which trade is being made.
No dollar amounts appear on this page. The trust rate brackets are adjusted annually, and the trust threshold for the net investment income tax is not a fixed figure at all — IRC §1411(a)(2)(B)(ii) ties it to the start of the top trust bracket, so it moves every year. Take current figures from the IRS revenue procedure for the year in question.
Sources
IRC §1(e) and §1(j) (as made permanent by P.L. 119-21); §641; §643(a); §644; §651 and §661 (distribution deduction); §663(b) and Treas. Reg. §1.663(b)-2; §671 and §673–677 (grantor trust rules); §675(4)(C) (substitution power); §1411(a)(2) and (b) (net investment income tax); Rev. Rul. 2008-22. North Carolina Dept. of Revenue v. Kaestner Family Trust, 588 U.S. 262 (2019). All read July 2026.
This states what the cited authority says. It is not tax advice, and retirement-plan design turns on facts about your business and your other entities that no page can see. Every dollar limit referenced here is indexed and changes annually.