The estate income tax return due date is the 15th day of the fourth month after the estate’s tax year ends.1Office of the Law Revision Counsel. 26 U.S. Code 6072 – Time for Filing Income Tax Returns For a calendar-year estate, that lands on April 15. The return itself is IRS Form 1041, and any domestic estate with at least $600 in gross income during its tax year, or with a nonresident alien beneficiary, has to file one.2Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025) The exact date varies from estate to estate because the executor chooses when the estate’s tax year ends.
Form 1041 is a separate filing from the decedent’s final personal Form 1040 and from the federal estate tax return on Form 706. Each has its own deadline, and the one covered here is the income tax return the estate itself files on income earned after death.
How the Executor’s Choice of Tax Year Sets the Date
Estates can use either a calendar year ending December 31 or a fiscal year ending on the last day of any other month. The executor makes this choice on the first Form 1041, and the choice is permanent for the life of the estate. The first tax year always begins the day after the date of death, so it is a short year no matter which option you pick.
Say the decedent died on June 15. With a calendar year, the first short year runs June 16 through December 31, and Form 1041 is due the following April 15.3Internal Revenue Service. Forms 1041 and 1041-A: When to File With a fiscal year ending May 31, the first short year runs June 16 through May 31, and the return is due October 15.
A longer first tax year pushes the initial filing deadline further out, which gives the executor more time to gather income records, inventory assets, and coordinate with beneficiaries. It can also stretch the $600 personal exemption that estates receive across an extra year.4Office of the Law Revision Counsel. 26 USC 642 – Special Rules for Credits and Deductions
Weekends and Legal Holidays
If the calculated due date falls on a Saturday, Sunday, or legal holiday, it moves to the next business day.5Office of the Law Revision Counsel. 26 U.S. Code 7503 – Time for Performance of Acts Where Last Day Falls on Saturday, Sunday, or Legal Holiday “Legal holiday” covers federal holidays in Washington, D.C., and any statewide holiday where the IRS office receiving the return is located.
Getting More Time to File
When the executor needs more time, Form 7004 provides an automatic 5½-month extension for Form 1041.6Internal Revenue Service. Instructions for Form 7004 (Rev. December 2025) The extension request has to be filed electronically or postmarked by the original due date. For a calendar-year estate, that moves the filing deadline from April 15 to September 30.
An extension buys time to file, not time to pay. The executor has to estimate the estate’s tax liability and send the full amount with Form 7004. Anything short starts accruing failure-to-pay penalties and interest from the original due date.
Extensions to Pay
In narrow cases where paying on time would force the estate to sell assets at a loss, the executor can ask for an extension of time to pay with Form 1127. The standard is “undue hardship,” which the IRS treats as more than inconvenience. The application calls for a detailed explanation, a statement of assets and liabilities, and an itemized income-and-expense list for the three months before the due date.7Internal Revenue Service. Form 1127 Application for Extension of Time for Payment of Tax Due to Undue Hardship Form 1127 must reach the IRS by the return’s original due date, not counting any filing extension. Note that Form 1127 is for income tax; Form 4768 is the equivalent for estate tax on Form 706.
Quarterly Estimated Tax Deadlines
Estates that expect to owe $1,000 or more for the year, after subtracting withholding and credits, generally have to make quarterly estimated payments with Form 1041-ES.8Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1 For a calendar-year estate, the installment dates are April 15, June 15, September 15, and January 15 of the following year.9Internal Revenue Service. 2026 Form 1041-ES
Fiscal-year estates follow a different schedule: the 15th day of the 4th, 6th, and 9th months of the estate’s tax year, plus the 1st month of the next tax year.9Internal Revenue Service. 2026 Form 1041-ES An estate with an October 31 year-end would owe installments on February 15, April 15, July 15, and November 15.
The Two-Year Exemption
One rule spares many executors from quarterly payments entirely: an estate is exempt from estimated tax requirements for any tax year ending within two years of the date of death.10Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax Since most estates close within that window, this covers the majority of them. For an estate that stays open longer, estimated payments start with the first tax year that ends after the two-year window closes.
The Estate’s Final Return
The final Form 1041 covers the period from the start of the estate’s last tax year through the date of termination, when all assets have been distributed. The due date follows the same formula: the 15th day of the fourth month after that final short year ends.3Internal Revenue Service. Forms 1041 and 1041-A: When to File
A calendar-year estate that wraps up on July 1 has a final tax year running January 1 through July 1, with the return due November 15. The executor checks the “Final Return” box on Form 1041 to signal the entity no longer exists.
The executor also has to issue a Schedule K-1 to each beneficiary showing their share of the estate’s income, deductions, and credits for that final period. The K-1 is due no later than the date the final Form 1041 is filed.8Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1 Beneficiaries need these forms to report the income on their personal returns, so a late K-1 ripples through to everyone else’s tax filing.
What Happens If You Miss the Deadline
Filing Form 1041 late without a valid extension triggers a failure-to-file penalty of 5% of the unpaid tax for each month or partial month the return is late, capped at 25%.11Office of the Law Revision Counsel. 26 U.S. Code 6651 – Failure to File Tax Return or to Pay Tax If the return is more than 60 days late, a minimum penalty applies, equal to the lesser of a fixed dollar amount (adjusted annually for inflation) or 100% of the tax due.
Even a timely-filed return with unpaid tax carries a separate failure-to-pay penalty of 0.5% per month, also capped at 25%.12Internal Revenue Service. Failure to Pay Penalty When both penalties run at once, the failure-to-file penalty drops to 4.5% per month so the combined monthly charge stays at 5%. With an approved IRS payment plan in place, the failure-to-pay rate drops to 0.25% per month.
Interest runs on top. The IRS resets underpayment interest quarterly at the federal short-term rate plus three percentage points, compounded daily.13Internal Revenue Service. Quarterly Interest Rates Interest cannot be waived for reasonable cause; the only way to stop it is to pay the balance.
Both penalties can be abated if the executor shows the delay was due to reasonable cause and not willful neglect. In practice that means documenting a genuine obstacle, such as waiting for a court order appointing the executor, rather than simply being busy or unaware of the deadline.