DNI Tax: How Trusts and Beneficiaries Are Taxed

Distributable net income, or DNI, is the figure that caps how much of a trust or estate’s income can be shifted to its beneficiaries for tax purposes. It sets the ceiling on the income distribution deduction the trust claims on Form 1041, and it sets the ceiling on what beneficiaries report as taxable income from the trust. Anything distributed above DNI is treated as a tax-free return of principal. Because trusts hit the top 37% federal bracket at roughly $16,000 of taxable income in 2026, while an individual doesn’t reach that rate until well over $600,000, DNI is often the single most consequential number on a trust’s return.

Why DNI Drives Trust Tax Planning

Trusts and estates run on the most compressed brackets in the federal system. For 2026, a trust pays 10% on the first $3,300 of taxable income, 24% from $3,300 to $11,700, 35% from $11,700 to $16,000, and 37% on everything above that. A single filer wouldn’t cross into 37% until roughly $626,000.

That compression is why DNI exists as a planning concept rather than just an accounting one. A dollar of trust income that qualifies as DNI and gets distributed to a beneficiary in the 12% or 22% bracket is taxed at the beneficiary’s rate, not the trust’s. A trust that accumulates income it could have distributed is frequently paying 37% on income that would have cost a fraction of that in the beneficiary’s hands. DNI is the mechanism that makes the shift legally work: it limits how much tax actually travels with a distribution.

How DNI Is Calculated

The starting point is the trust or estate’s taxable income before the distribution deduction, as reported on Form 1041. Internal Revenue Code Section 643 then requires several adjustments to arrive at DNI.¹

The personal exemption gets added back. Simple trusts receive a $300 exemption, other trusts $100, and estates $600, and these figures are fixed by statute without inflation adjustment.² The distribution deduction itself is also added back, since DNI needs to represent the pool of income available to distribute before the deduction reduces it.

Tax-exempt interest, such as municipal bond interest, is added in, reduced by any expenses tied directly to producing it. Capital gains allocated to principal are subtracted out, and capital losses are generally excluded unless they factor into amounts actually distributed. The final number is computed on Schedule B of Form 1041.³

How DNI Splits the Tax Between the Trust and the Beneficiaries

DNI carries out what practitioners call the conduit principle: trust income is taxed once, either to the trust or to the beneficiary, not both. The trust claims an income distribution deduction equal to the lesser of what it actually distributed or its DNI. That deduction reduces the trust’s taxable income by the same amount the beneficiary must report on their own return.⁴ Anything distributed over DNI is principal to the beneficiary and arrives tax-free.

Simple Trusts

A simple trust is required to distribute all of its accounting income every year, makes no distributions of principal, and pays nothing to charity. Because all income is paid out, the distribution deduction generally equals DNI, and nearly the entire tax burden falls on the beneficiaries. The deduction still cannot exceed DNI, so even when accounting income is higher, the pass-through stops at the DNI ceiling.⁵

Complex Trusts and the Two-Tier Ordering

A complex trust is any trust that isn’t simple. It can accumulate income, distribute principal, or make charitable gifts. When a complex trust makes several kinds of distributions in the same year, DNI is allocated using a two-tier system. Tier 1 covers mandatory current income distributions and absorbs DNI first. Tier 2 covers discretionary income, principal, and other permissible amounts, with any remaining DNI spread proportionally across them.⁴ The ordering tracks the economics: beneficiaries entitled to actual income absorb its tax first, before anyone receiving a discretionary payment of principal.

Capital Gains and Tax-Exempt Interest Inside DNI

Capital gains are usually excluded from DNI and taxed at the trust level. There are three situations in which they can be pulled in, and inclusion matters because it moves the tax from the trust to the beneficiary. The first is when the trust instrument or local law specifically allocates capital gains to income rather than principal. The second is when the fiduciary consistently treats capital gains as income, which sometimes happens in a trust’s first year. The third is when gains are actually distributed to a beneficiary or are used in computing the amount distributed. A terminating trust that pays out everything, including realized gains, is the common example: in that final year, the gains enter DNI.¹

Tax-exempt interest works differently. It is included in DNI so the figure reflects the trust’s full economic income, then backed out when computing the deductible portion. When a beneficiary’s distribution includes a share attributable to tax-exempt interest, that portion stays tax-exempt in their hands. Income keeps its character as it passes through. Expenses tied to producing the tax-exempt income are disallowed, so the trust can’t claim both the exemption and a deduction for the cost of earning it.⁶

The 3.8% Net Investment Income Tax

DNI planning carries over to the NIIT. Section 1411 imposes a 3.8% surtax on the lesser of a trust’s undistributed net investment income or the amount by which its adjusted gross income exceeds the threshold where the top trust bracket begins.⁷ For 2026 that threshold is about $16,000.

The operative word is “undistributed.” Investment income distributed to beneficiaries drops out of the trust’s NIIT calculation and is tested instead against the beneficiary’s own threshold, which starts at $200,000 for single filers and $250,000 for joint filers. A beneficiary earning $80,000 owes no NIIT on the same dollars. DNI is what sets how much of the distribution counts as a taxable pass-through rather than a nontaxable return of principal, so it governs the surtax outcome as much as the regular tax one.

The 65-Day Election

Section 663(b) gives trustees a short window after year-end to adjust. A distribution made within the first 65 days of a new tax year can be elected to count as if made on the last day of the prior tax year.⁸ That lets the trustee wait until the year’s income picture is in focus before deciding how much to distribute for DNI purposes.

The election is made on each year’s return and applies only to that year. The amount eligible is capped at the greater of the trust’s accounting income or its DNI for the prior year, reduced by distributions already made during that year.⁹ A trustee who realizes in February that the trust had an unexpectedly strong year can distribute and elect back, moving income out of the 37% bracket and into the beneficiary’s lower one.

The Separate Share Rule for Multi-Beneficiary Trusts

If a single trust has multiple beneficiaries with economically independent interests, Section 663(c)’s separate share rule treats each beneficiary’s share as its own trust for DNI calculation.⁸ The rule is not elective; it applies automatically wherever the trust has substantially separate and independent shares. Without it, a large discretionary distribution to one beneficiary could consume the trust’s entire DNI, leaving other beneficiaries receiving what is economically income on a tax-free basis.

Filing, K-1s, and Deadlines

A domestic trust must file Form 1041 if it has any taxable income, gross income of $600 or more, or a nonresident alien beneficiary. A domestic estate files if it has gross income of $600 or more or a nonresident alien beneficiary.¹⁰ Trusts have a filing trigger at any amount of taxable income, even when gross income is under $600.

Calendar-year trusts and estates file Form 1041 by April 15.¹¹ Form 7004 provides an automatic extension of time to file, but not to pay.¹² Because the 65-day election is made on the return itself, filing on time or on a valid extension matters for anyone relying on it.

The fiduciary issues a Schedule K-1 (Form 1041) to each beneficiary who received a distribution or was allocated trust income.³ The K-1 reports interest, ordinary dividends, qualified dividends, capital gains, and other income types separately, preserving the character of each as it reaches the beneficiary.¹³ Qualified dividends passed out through a K-1 still receive the lower capital gains rates on the beneficiary’s Form 1040. The K-1 is what turns DNI from a formula on a trust return into actual numbers on individual tax returns.

1
Office of the Law Revision Counsel. 26 U.S.C. 643 – Definitions Applicable to Subparts A, B, C, and D
2
govinfo. 26 U.S.C. 642 – Special Rules for Credits and Deductions
3
Internal Revenue Service. Form 1041 – U.S. Income Tax Return for Estates and Trusts
4
Office of the Law Revision Counsel. 26 U.S.C. 661 – Deduction for Estates and Trusts Accumulating Income or Distributing Corpus
5
eCFR. 26 CFR 1.651(b)-1 – Deduction for Distributions to Beneficiaries
6
Office of the Law Revision Counsel. 26 U.S.C. 265 – Expenses and Interest Relating to Tax-Exempt Income
7
Office of the Law Revision Counsel. 26 U.S.C. 1411 – Imposition of Tax
8
Office of the Law Revision Counsel. 26 U.S.C. 663 – Special Rules Applicable to Sections 661 and 662
9
govinfo. 26 CFR 1.663(b)-1 – Distributions in First 65 Days of Taxable Year
10
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1
11
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1
12
Internal Revenue Service. About Form 7004, Application for Automatic Extension of Time To File Certain Business Income Tax, Information, and Other Returns
13
Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR