Income earned inside a trust is taxed under one of two regimes. If the trust is a non-grantor trust, it files its own return and pays tax on whatever income it keeps, under a compressed rate schedule that reaches the top federal bracket at roughly $16,000 of taxable income for 2026.1Internal Revenue Service. 2026 Form 1041-ES, Estimated Income Tax for Estates and Trusts Income the trust distributes to beneficiaries is deducted by the trust and reported by the beneficiary at that person’s own rates. If the trust is a grantor trust, none of that applies: the grantor reports every dollar of trust income on a personal return as if the trust did not exist. Those are the trust income tax rules in outline, and the rest is detail about how the pieces interact.
Why the Rate Schedule Changes Everything
A single individual does not reach the top federal income tax bracket until taxable income runs into the hundreds of thousands of dollars. A trust gets there at about $16,000. The statutory rate schedule for trusts sits in section 1(e) of the Internal Revenue Code, with the dollar thresholds adjusted each year for inflation.2Office of the Law Revision Counsel. 26 USC 1 – Tax Imposed
On top of the regular income tax, a trust pays the 3.8% Net Investment Income Tax on undistributed investment income once its adjusted gross income exceeds the dollar point where the top bracket starts. For 2026 that threshold is the same $16,000.3Internal Revenue Service. Questions and Answers on the Net Investment Income Tax The NIIT applies to the lesser of the trust’s undistributed net investment income or the excess of AGI over the threshold. Grantor trusts and charitable trusts are exempt because their income is taxed elsewhere.
Combine the compressed brackets with the NIIT and a trust holding onto investment income can face an effective marginal rate above 40%. The same income distributed to a beneficiary in the 22% or 24% individual bracket is taxed much less heavily. For most non-grantor trusts, that math makes distributing income the default tax-efficient move unless something in the trust purpose argues for keeping it.
Who Actually Pays: DNI and the Distribution Deduction
The IRS uses Distributable Net Income, or DNI, to split a trust’s taxable income between the trust and its beneficiaries. DNI is a ceiling. It caps the deduction the trust can take for amounts paid out, and it caps the amount beneficiaries have to report.4eCFR. 26 CFR 1.643(a)-0 – Distributable Net Income; Deduction for Distributions; In General Without it, the same dollar could end up taxed twice or not at all.
DNI starts with the trust’s taxable income before the distribution deduction and before the trust’s personal exemption. Capital gains allocated to principal come out of the calculation, which is the main reason those gains tend to stay taxed at the trust.5Office of the Law Revision Counsel. 26 USC 643 – Definitions Applicable to Subparts A, B, C, and D Tax-exempt interest goes back in, net of allocable expenses, so the pass-through tracks every type of income. The distribution deduction itself is stripped out to avoid circularity.
The trust’s actual distribution deduction is the lesser of DNI or the amount of fiduciary accounting income actually paid out during the year.6eCFR. 26 CFR 1.661(a)-2 – Deduction for Distributions to Beneficiaries If a trustee distributes $50,000 but DNI is only $30,000, the trust deducts $30,000 and the beneficiary reports $30,000. The other $20,000 is treated as a tax-free distribution of principal.
The character of the income follows it out the door. Qualified dividends the trust received come through to the beneficiary as qualified dividends. Tax-exempt interest stays exempt. The K-1 the trust sends breaks out each income category so the beneficiary reports it correctly on Form 1040.7Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR
Accounting Income Versus Taxable Income
A trust runs on two different definitions of income, and they often give different numbers. Fiduciary Accounting Income (FAI) tells the trustee what is available to distribute. It is defined by the trust document, read against the state’s version of the Uniform Principal and Income Act.8The Tax Law Center. Fiduciary Accounting Income and Principal Taxable income is the Subchapter J calculation: every dollar of realized income minus allowable deductions.9eCFR. 26 CFR 1.641(a)-0 – Scope of Subchapter J
For ordinary items (interest, dividends, rents, royalties) the two usually line up, so distribution planning is straightforward. Capital gains are the hard case. When the trustee sells an appreciated asset, the gain is real income for federal tax purposes, but default fiduciary accounting rules allocate capital gains to the trust’s principal rather than to distributable income.10eCFR. 26 CFR 1.643(a)-3 – Capital Gains and Losses Those gains stay trapped in the trust and get taxed at the compressed trust rates, even if the trustee would rather pass the burden to a beneficiary. Some trust instruments override the default and let the trustee allocate gains to income; many do not.
Simple Trusts and Complex Trusts
Non-grantor trusts come in two flavors. A simple trust is one whose governing instrument requires it to distribute all income currently, makes no charitable contributions, and distributes nothing other than current income.11eCFR. 26 CFR 1.651(a)-1 – Simple Trusts; Deduction for Distributions; In General The trustee has no discretion to hold income back. Essentially all taxable income other than principal-allocated capital gains flows to beneficiaries each year, and the trust itself pays little or no income tax.
Everything else is a complex trust: trusts that can accumulate income, trusts that distribute principal, trusts that make charitable gifts. Complex trusts are where distribution planning matters, because the trustee’s choices decide whether income is taxed at trust rates or beneficiary rates.
The 65-Day Election
A complex trust gets a timing tool worth knowing. Under the 65-day rule, the trustee can elect to treat distributions made within the first 65 days of a tax year as if they had been made on the last day of the prior year.12eCFR. 26 CFR 1.663(b)-1 – Distributions in First 65 Days of Taxable Year For a calendar-year trust, distributions made by early March can be counted against the prior year’s DNI.
The election is useful when the trustee cannot pin down the trust’s income until after year-end but wants to avoid trust-level tax on it. The amount eligible cannot exceed the greater of the trust’s FAI or its DNI for the year in question. The election is not automatic; the trustee has to make it affirmatively on the trust’s tax return, and it has to be made fresh each year. Miss it and the distribution counts against the current year instead, while the prior year’s retained income stays taxed at trust rates.
Grantor Trusts Are the Exception
Everything above assumes a non-grantor trust. A grantor trust is treated as a tax non-entity: income, deductions, and credits all flow directly to the grantor’s personal return whether or not the trust distributes anything.13Internal Revenue Service. Abusive Trust Tax Evasion Schemes – Questions and Answers
A trust lands in grantor status when the person who created it keeps certain powers or benefits. The most common trigger is the power to revoke, which is why every revocable living trust is a grantor trust by definition. Irrevocable trusts can also be grantor trusts if the grantor keeps control over who benefits, holds certain administrative powers such as the right to borrow from the trust without adequate security, or can direct how the income is used.14govinfo. 26 USC 671 – Trust Income, Deductions, and Credits Attributable to Grantors and Others as Substantial Owners
Grantor status is sometimes deliberate. Estate planners use intentionally defective grantor trusts to move assets out of the grantor’s taxable estate while leaving the income tax burden with the grantor. The grantor paying the trust’s tax effectively functions as a tax-free gift to the beneficiaries, since the trust assets grow without being drawn down to cover taxes.
Filing, K-1s, and Estimated Payments
A non-grantor trust with any taxable income, or gross income of $600 or more, must file Form 1041. The return is due by the 15th day of the fourth month after the trust’s tax year closes, which is April 15 for a calendar-year trust.15Internal Revenue Service. Forms 1041 and 1041-A – When to File
Any trust that distributes income has to prepare a Schedule K-1 for each beneficiary, with that beneficiary’s share of each category of income, deduction, and credit broken out separately.7Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR
Trusts expecting to owe $1,000 or more after withholding and credits generally have to make quarterly estimated tax payments using Form 1041-ES.16Internal Revenue Service. About Form 1041-ES, Estimated Income Tax for Estates and Trusts The quarterly deadlines match the individual schedule: April 15, June 15, September 15, and January 15 of the following year. Underpayment triggers penalties, so a trustee who intends to keep income inside the trust needs to project the bill and pay through the year rather than wait for the return.