DNI Tax: Trust Brackets, the 65-Day Election, and Beneficiary Shares

Distributable net income, or DNI, is the tax figure that decides who pays federal income tax on a trust or estate’s earnings: the entity itself, or the beneficiaries who receive distributions. The DNI tax rules cap the income distribution deduction a non-grantor trust or estate can claim on Form 1041, and they cap the amount a beneficiary must report as taxable income from the trust. Anything distributed above DNI is treated as a tax-free return of principal. Anything at or below it shifts the tax from the trust to the beneficiary.

That shift is worth real money because trust and estate tax brackets are the most compressed in the federal system.

Why the Trust Brackets Make DNI Matter

For 2026, a trust or estate reaches the top 37% federal rate at roughly $16,000 of taxable income. A single individual doesn’t hit 37% until well above $600,000. The approximate 2026 brackets for trusts and estates:

10% on the first $3,300 of taxable income
24% from $3,300 to $11,700
35% from $11,700 to $16,000
37% on everything above $16,000

A trust earning $50,000 of ordinary income pays 37% on every dollar past $16,000. If those same dollars land on a beneficiary in the 12% or 22% bracket, the combined family tax bill drops sharply. DNI is the number that governs how much can be moved.

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 is added back. So is the distribution deduction itself, because DNI has to represent the full pool of income available for distribution before that deduction reduces it. Tax-exempt interest is added in, net of any expenses directly tied to producing it, so DNI reflects the trust’s true economic income. Capital gains allocated to principal are subtracted out, and capital losses are excluded unless they factor into amounts actually distributed. The final figure is computed on Schedule B of Form 1041.²

Pulling capital gains out of DNI is the single biggest reason a trust with large realized gains still owes tax at the trust level even after distributing “everything” to beneficiaries.

How the Tax Splits Between Trust and Beneficiary

The mechanism tax professionals call the conduit principle runs through DNI. Income is taxed once, either at the trust or at the beneficiary, not both. The trust claims an income distribution deduction equal to the lesser of the amount actually distributed or DNI. That deduction reduces the trust’s taxable income. The beneficiary then reports their share of the distribution as taxable income on their own return, up to the DNI limit.³ Distributions above DNI are treated as principal and arrive tax-free.

The fiduciary reports each beneficiary’s share on Schedule K-1, breaking out interest, ordinary dividends, qualified dividends, capital gains, and other income items separately.⁴ Income keeps its character on the way through, so a beneficiary’s share of qualified dividends still gets the preferential capital gains rate on their Form 1040.

Simple Trusts

A simple trust must distribute all of its accounting income each year, distributes no principal, and makes no charitable gifts. The distribution deduction typically equals DNI, and nearly the full tax burden falls on the beneficiaries. The deduction can never exceed DNI, so if accounting income runs higher than DNI, the pass-through stops at the DNI ceiling.⁵

Complex Trusts and the Two-Tier System

A complex trust is any trust that isn’t simple. It can accumulate income, distribute principal, or make charitable gifts. When it makes more than one kind of distribution, DNI is allocated in two tiers. Tier 1 covers income the trust is required to distribute currently, and it absorbs DNI first. Tier 2 covers discretionary income payments, principal distributions, and other permissible amounts. Any DNI left after Tier 1 is spread proportionally across Tier 2 distributions.³

The order matches economics: beneficiaries entitled to mandatory income are receiving the trust’s actual earnings, so they absorb the tax first.

Capital Gains and Tax-Exempt Interest in DNI

Capital gains are generally excluded from DNI and taxed at the trust level. Three exceptions can pull them in, and each shifts the tax from the trust to the beneficiary:

The trust instrument or local law allocates capital gains to income rather than principal.
The fiduciary has consistently allocated capital gains to income, which sometimes happens in a trust’s first year.
Capital gains are actually distributed to a beneficiary or are used to determine the amount distributed. A terminating trust that pays out realized gains in its final year is the classic case.¹

Tax-exempt interest is different. It sits inside DNI so that the total pool reflects the trust’s real income, but it is backed out when the taxable distribution deduction is calculated. A beneficiary’s share of a distribution attributable to tax-exempt interest stays tax-exempt on the K-1. Expenses tied to producing that tax-exempt income are disallowed, so the trust cannot get both the exemption and a deduction for the cost of earning it.⁶

The 65-Day Election

Section 663(b) lets a fiduciary treat a distribution made in the first 65 days of a new tax year as if it had been made on the last day of the prior year.⁷ That gives the trustee time to see the full-year income picture before deciding how much to push out for DNI purposes.

The election is made on the return for the year to which the distribution is being applied, and it applies only to that year. The amount eligible is capped at the greater of the trust’s accounting income or its DNI for that prior year, reduced by distributions already made during it.⁸ This is where the compressed brackets become actionable: a trustee who realizes in February that the trust earned more than expected can distribute now and elect to have it count for last year.

Multiple Beneficiaries: The Separate Share Rule

When a single trust has beneficiaries whose economic interests are independent of one another, Section 663(c)’s separate share rule treats each share as if it were its own trust for DNI purposes.⁷ It’s not elective; it applies automatically wherever substantially separate and independent shares exist. Without it, a large discretionary distribution to one beneficiary could soak up all the trust’s DNI and leave other beneficiaries receiving what is economically taxable income on a tax-free basis.

DNI and the Net Investment Income Tax

Trusts and estates also face a 3.8% surtax on net investment income under Section 1411. The tax applies to the lesser of the trust’s undistributed net investment income or the amount by which its adjusted gross income exceeds the threshold at which the top trust bracket begins.⁹ For 2026, that threshold is roughly $16,000.

The word that matters is “undistributed.” Investment income that flows out to a beneficiary through DNI is tested against the beneficiary’s own NIIT thresholds, which start at $200,000 for single filers and $250,000 for married joint filers. A beneficiary earning $80,000 owes no NIIT on the same dollars that would have been surtaxed inside the trust. Distributing investment income is one of the most effective ways to sidestep the surtax, and DNI controls how much of that distribution actually counts.

Filing Requirements and Deadlines

A domestic trust must file Form 1041 if it has any taxable income, has gross income of $600 or more regardless of taxable income, or has a nonresident alien beneficiary. A domestic estate must file if it has gross income of $600 or more, or has a nonresident alien beneficiary.¹⁰ Trusts, unlike estates, have a trigger at any amount of taxable income even if 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 The fiduciary issues a Schedule K-1 to each beneficiary who received a distribution or was allocated income, reporting each character of income separately so the beneficiary can carry it correctly onto Form 1040.² Trustees relying on the 65-day election should note that the election is made on the return itself, so filing on time or on a valid extension is what keeps the planning intact.

1
Office of the Law Revision Counsel. 26 U.S.C. 643 – Definitions Applicable to Subparts A, B, C, and D
2
Internal Revenue Service. Form 1041 – U.S. Income Tax Return for Estates and Trusts
3
Office of the Law Revision Counsel. 26 U.S.C. 661 – Deduction for Estates and Trusts Accumulating Income or Distributing Corpus
4
Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR
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. 663 – Special Rules Applicable to Sections 661 and 662
8
govinfo. 26 CFR 1.663(b)-1 – Distributions in First 65 Days of Taxable Year
9
Office of the Law Revision Counsel. 26 U.S.C. 1411 – Imposition of Tax
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