When Is Form 1041 Due? Deadlines, Extensions, and Late Penalties

Form 1041 is due on the 15th day of the fourth month after the estate’s or trust’s tax year closes.¹ For a calendar-year filer, that means April 15. The Form 1041 due date for the 2025 tax year is April 15, 2026.² Estates that adopt a fiscal year get a different date based on when that year ends, and an automatic extension is available for fiduciaries who need more time to prepare the return.

The April 15 Deadline for Trusts and Calendar-Year Estates

Federal law requires almost all trusts to use a calendar year ending December 31.³ That puts the return on the same April 15 schedule most individual taxpayers already follow.¹ Estates can pick a calendar year too, and many do, especially when administration is simple.

One narrow exception matters for former revocable living trusts: if the grantor has died, the executor and trustee can jointly elect under Section 645 to treat the trust as part of the estate, which lets that trust use a fiscal year instead of the standard calendar year.⁴ Without that election, plan on April 15.

How to Calculate the Deadline for a Fiscal-Year Estate

An estate can elect a fiscal year ending on the last day of any month, often chosen with reference to the date of the decedent’s death. Whatever month you pick, the return is due on the 15th day of the fourth month after that fiscal year closes.¹

A few examples make the math concrete:

Fiscal year ending June 30: return due October 15.
Fiscal year ending September 30: return due January 15 of the following year.
Fiscal year ending December 31 (calendar year): return due April 15.

When Weekends and Holidays Push the Date

If the deadline lands on a Saturday, Sunday, or legal holiday, the return is timely if filed the next business day.⁵ For this rule, “legal holiday” includes holidays observed in the District of Columbia, even if your own state does not recognize them.⁶

The holiday that most often shifts April 15 is Emancipation Day, observed each year on April 16 in Washington, D.C. When April 16 is a Friday, D.C. observes the holiday that day and the filing deadline moves to the following Monday. When April 16 is a Saturday, D.C. observes it the preceding Friday (April 15), which also pushes the deadline to Monday for filers nationwide.

For the 2025 tax year, none of this shifts anything: April 15, 2026 is a Wednesday and April 16 is a Thursday. The due date stays April 15, 2026.² Fiduciaries filing at IRS offices in states with their own statewide holidays on the deadline date (Patriots’ Day, for example) may pick up an extra day when the dates coincide.⁵

Getting More Time With Form 7004

If the return will not be ready by the original due date, file Form 7004 to request an automatic extension of five and a half months. For a calendar-year trust or estate, that moves the filing deadline from April 15 to September 30. The form asks for the entity’s Employer Identification Number, the beginning and ending dates of the tax year, and an estimate of any tax owed.⁷

Extensions cover paperwork, not payment. Any tax you expect to owe is still due on the original filing date, and unpaid amounts start accumulating penalties and interest from that day forward.⁷

Schedule K-1s Are Due the Same Day

Along with the 1041, the fiduciary must prepare a Schedule K-1 for each beneficiary who received a distribution or an allocation of income during the year. Beneficiaries use those forms to report their share of the estate’s or trust’s income on their own returns. Each K-1 must reach the beneficiary no later than the date Form 1041 is due, including any extended deadline if you filed Form 7004.²

Missing that deadline is expensive. Failing to furnish a correct K-1 on time carries a penalty of $250 per statement, and $500 per statement if the failure is intentional.⁸ The penalty falls on the fiduciary personally, not on the estate or trust.

What Happens If You File or Pay Late

The IRS charges separate penalties for filing late and paying late, and both can hit the same return.

Failure to File

Miss the filing deadline (including any extension) without reasonable cause and the penalty is 5% of the unpaid tax for each month or partial month the return is late, up to a maximum of 25%.⁹ If the return is more than 60 days late, the minimum penalty is the lesser of $525 or the full amount of tax owed.¹⁰

Failure to Pay

A separate 0.5% penalty applies to the unpaid balance for each month or partial month it remains unpaid, capped at 25%. When both penalties apply in the same month, the failure-to-file penalty is reduced by the failure-to-pay amount, so the combined rate for that month is 5%, not 5.5%.¹¹

Interest

Interest runs on any unpaid balance from the original due date until the tax is paid. The IRS sets the rate quarterly; for the first quarter of 2026 the underpayment rate is 7%.¹² Interest cannot be waived and compounds daily regardless of the reason for late payment.

The Final Return Has the Same Deadline Rule

When an estate finishes distributing assets and paying debts, taxes, and administrative expenses, it is treated as terminated for federal income tax purposes.¹³ The fiduciary files a final Form 1041 for the short tax year ending on the termination date and checks the “Final return” box. The same rule applies: the return is due the 15th day of the fourth month after that short year closes.

Administration cannot be stretched out to keep the estate alive. If an estate stays open longer than reasonably necessary, the IRS can treat it as terminated, and income earned after that point becomes taxable to the beneficiaries who inherited the property rather than to the estate.¹³ The same limit applies to trusts winding down: a reasonable period is allowed to complete final distributions, but unreasonable delay shifts the tax burden to the beneficiaries.

1
Office of the Law Revision Counsel. 26 U.S.C. 6072 – Time for Filing Income Tax Returns
2
Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1
3
Office of the Law Revision Counsel. 26 U.S.C. 644 – Taxable Year of Trusts
4
Office of the Law Revision Counsel. 26 U.S.C. 645 – Certain Revocable Trusts Treated as Part of Estate
5
Office of the Law Revision Counsel. 26 U.S.C. 7503 – Time for Performance of Acts Where Last Day Falls on Saturday, Sunday, or Legal Holiday
6
eCFR. 26 CFR 301.7503-1 – Time for Performance of Acts Where Last Day Falls on Saturday, Sunday, or Legal Holiday
7
Internal Revenue Service. Instructions for Form 7004
8
Office of the Law Revision Counsel. 26 U.S.C. 6722 – Failure to Furnish Correct Payee Statements
9
Office of the Law Revision Counsel. 26 U.S.C. 6651 – Failure to File Tax Return or to Pay Tax
10
Internal Revenue Service. Topic No. 653, IRS Notices and Bills, Penalties and Interest Charges
11
Internal Revenue Service. Failure to Pay Penalty
12
Internal Revenue Service. Quarterly Interest Rates
13
eCFR. 26 CFR 1.641(b)-3 – Termination of Estates and Trusts