What Is the 65-Day Rule for Trust Distributions?

The 65-day rule for trust distributions, found in Internal Revenue Code Section 663(b), lets the trustee of a complex trust or the executor of an estate treat money paid out to beneficiaries during the first 65 days of a new tax year as if it had been distributed on December 31 of the prior year. The point is to move taxable income off the trust’s return, where brackets are brutally compressed, and onto a beneficiary’s return, where the same dollars usually face a much lower rate. The election is made on Form 1041, it’s optional, and once made it can’t be undone.

Why the Rule Exists

Trusts and estates run through the federal tax brackets at a sprint. For 2026, a trust pays 10% on its first $3,300 of taxable income, 24% from $3,301 to $11,700, 35% from $11,701 to $16,000, and 37% on everything above $16,000. A single individual doesn’t reach that top 37% rate until taxable income exceeds $640,600, and a married couple filing jointly doesn’t reach it until $768,700.¹

So a trust holding $50,000 of investment income pays 37% on most of it. The same $50,000 handed to a beneficiary in the 22% or 24% bracket is taxed at the beneficiary’s rate instead. The gap is often thousands of dollars per year.

The 3.8% Net Investment Income Tax widens the gap further. For a trust or estate, the NIIT applies once adjusted gross income exceeds the top-bracket threshold, which is $16,000 for 2026.² Stack the surtax on top of the 37% rate and a trust can face an effective federal rate of 40.8% on investment income. The NIIT only hits undistributed net investment income at the trust level, so a distribution under the 65-day rule can take investment income out of the trust’s NIIT base entirely.

Trustees often don’t have final income numbers by December 31. Late K-1s from partnerships, year-end gains, and final dividend figures can take weeks to settle. The 65-day window gives the fiduciary room to finish the math and still shift income to the prior year.

Which Trusts and Estates Can Use It

The election is available to complex trusts and to decedent’s estates. Simple trusts are excluded, because their governing instruments already require all current income to be distributed each year; there’s no discretion for the trustee to exercise and no planning window to use.³

Complex trusts qualify because the trustee can choose whether to accumulate income or distribute it. That discretion is the whole mechanism the rule relies on. The federal regulation gives the fiduciary the power to make the election directly; the trust document doesn’t have to mention Section 663(b).⁴ The document does, however, have to give the trustee authority to make discretionary distributions in the first place. If distributions are locked to a fixed schedule, the trustee may not be able to pay anything within the 65-day window at all.

How the 65-Day Window Works

For a calendar-year trust or estate, the window runs from January 1 through March 6 (the 65th day of the year in both 2026 and 2027). Any amount properly paid or credited to a beneficiary during that window can be elected to count as a December 31 distribution of the prior year.³ The regulation says that amounts treated as distributed in the preceding year carry that treatment “for all purposes,” which includes when the beneficiary reports the income.⁴

Here’s a concrete example. A complex trust earns $50,000 of ordinary income in 2025, but final numbers don’t come in until late January 2026. On February 10, 2026, the trustee distributes $30,000 and elects the 65-day rule on the trust’s 2025 Form 1041. The trust reports $20,000 of taxable income for 2025; the beneficiary reports the $30,000 on a 2025 individual return.

Partial elections are allowed. If distributing the full $30,000 would push the beneficiary into a higher bracket than the trust itself faces, the trustee can elect only part of the February payment back to the prior year and let the rest fall into the current year.

How Much You Can Elect

The amount you can treat as a prior-year distribution isn’t open-ended. The regulation caps it at the greater of the trust’s fiduciary accounting income or its distributable net income (DNI) for the prior year, reduced by any amounts already distributed or required to be distributed during that year.⁴

Say a trust has $100,000 of fiduciary accounting income and $85,000 of DNI for 2025, and the trustee already paid out $60,000 during 2025. The cap starts at the greater figure ($100,000) and subtracts the $60,000 already paid, leaving a maximum 65-day election of $40,000. Even if the trustee writes checks for $50,000 in January 2026, only $40,000 can be pulled back to 2025. Trustees who plan to use the rule should think twice about large late-December distributions, because those payments shrink the cap.

Making the Election on Form 1041

Nothing about this election is automatic. The trustee must affirmatively make it on Form 1041 for the year the income is being shifted into, by checking the box at Question 6 in the “Other Information” section of the return.⁵

It has to be made on a timely filed return, meaning by the original due date or any valid extension. For a calendar-year trust reporting 2025 income, the original due date is April 15, 2026. Filing Form 7004 adds an automatic 5½-month extension, pushing the deadline to September 30, 2026.⁵ A trustee who files in September can still elect to treat a February distribution as a prior-year event.

Once made, the election is irrevocable for that tax year.⁶ You can’t file, watch the numbers settle, and amend to pull it back. The modeling has to happen before the box is checked, not after.

What the Beneficiary Deals With

When the election is made, the beneficiary gets a Schedule K-1 (Form 1041) showing their share of the trust’s prior-year income, and that K-1 drives what goes on the individual return.⁷ Cash received in February 2026 under a 65-day election gets reported on the beneficiary’s 2025 Form 1040, not the 2026 return.

That creates a timing problem. The beneficiary owes tax on income they didn’t know about during the quarterly estimated tax cycle, which can trigger an underpayment penalty. The fix is Form 1041-T, which lets the trustee allocate estimated tax payments the trust made during the year to the beneficiary. If the trust paid in enough, the beneficiary gets credit for those payments on the individual return and the penalty exposure drops.⁵

Communication matters. A beneficiary who files in early February and then receives a K-1 in March reflecting a 65-day election will have to amend. Most practitioners tell beneficiaries to wait or extend when a 65-day distribution is likely.

If You Miss the Deadline

If the trustee doesn’t make the election on a timely filed return, distributions made in January through early March simply count as current-year events, and the prior-year savings are gone. Two relief paths exist. Treasury Regulation 301.9100-2 provides an automatic six-month extension from the original return due date (not counting extensions) for certain elections, as long as the taxpayer filed the return on time and takes corrective action within the window. Regulation 301.9100-3 covers situations outside the automatic rule, allowing a late election when the taxpayer can show they acted reasonably and in good faith and that relief won’t prejudice the government. Relief under 301.9100-3 typically requires a private letter ruling request, with IRS user fees and professional costs attached.

The cheaper protection is filing Form 7004 for an extension, which carries the election deadline out to late September and gives the trustee time to finalize the numbers without asking the IRS for forgiveness.

Checks Worth Running Before You Elect

The rule saves money only when the beneficiary’s rate really is lower than the trust’s. Model it. A beneficiary who already sits in the 37% bracket, or who has their own NIIT or qualified business income exposure, may not help the overall tax picture. Qualified business income passed through a trust is a particularly fiddly area: the Section 199A deduction phases out as taxable income rises, and shifting DNI changes the allocation of QBI between trust and beneficiary. The math gets involved quickly, and running it before the election is the only time it counts.

The character of income flows through to the beneficiary with the distribution. Tax-exempt municipal bond interest stays tax-exempt. Capital gains, qualified dividends, and ordinary income each keep their identity on the K-1.⁸ That matters because the beneficiary’s effective rate on the distribution depends on what the income is, not just how much.

Build the 65-day review into the annual trust administration calendar. The window is short, the election is irrevocable, and the deadline for making it on the return is firm. A trustee who runs the numbers in January and either distributes by March 6 or extends the return has preserved every option the rule provides.

1
Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
2
Internal Revenue Service. Topic No. 559, Net Investment Income Tax
3
Office of the Law Revision Counsel. 26 U.S. Code 663 – Special Rules Applicable to Sections 661 and 662
4
eCFR. 26 CFR 1.663(b)-1 – Distributions in First 65 Days of Taxable Year
5
Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1
6
eCFR. 26 CFR 1.663(b)-2 – Election
7
Internal Revenue Service. Instructions for Schedule K-1 (Form 1041) for a Beneficiary Filing Form 1040 or 1040-SR (2025)
8
Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025)