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 is April 15. Because the executor chooses the estate’s tax year on the first Form 1041, the actual date shifts from one estate to another. Any domestic estate with at least $600 in gross income during its tax year, or with a nonresident alien beneficiary, has to file.2Internal Revenue Service. Instructions for Form 1041 and Schedules A, B, G, J, and K-1 (2025)
Form 1041 is a separate return from the decedent’s final Form 1040 and from the federal estate tax return on Form 706, which is due nine months after the date of death.3Internal Revenue Service. How to File a Final Tax Return for Someone Who Has Passed Away Each has its own deadline, and mixing them up is a common executor mistake.
How the Tax Year You Choose Sets the Date
Estates, unlike trusts, can adopt either a calendar year ending December 31 or a fiscal year ending on the last day of any other month. The executor makes the choice on the first Form 1041, and it stays fixed for the life of the estate. The first tax year always begins the day after death, so it is a short year no matter which option you pick.
Say the decedent dies on June 15. Pick a calendar year, and the first short year runs June 16 through December 31, with Form 1041 due the following April 15.4Internal Revenue Service. Forms 1041 and 1041-A: When to File Pick a fiscal year ending May 31, and the first short year runs June 16 through the following May 31, with the return due October 15.
A longer first tax year pushes the initial filing deadline further out. That gives the executor more time to gather income records, identify assets, and coordinate with beneficiaries. It can also spread income across tax periods and pick up an extra year of the $600 personal exemption estates receive.5Office of the Law Revision Counsel. 26 USC 642 – Special Rules for Credits and Deductions
If the Date Falls on a Weekend or Holiday
When the calculated due date lands on a Saturday, Sunday, or legal holiday, the deadline moves to the next business day.6Office 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 holidays include federal holidays in Washington, D.C., and statewide holidays where the IRS office receiving the return is located.
Getting More Time to File
Form 7004 buys an automatic 5½-month extension for Form 1041.7Internal Revenue Service. Instructions for Form 7004 (Rev. December 2025) It 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.
The extension covers filing only, not payment. The executor has to estimate the estate’s tax liability and send the full amount with Form 7004. Any shortfall starts running failure-to-pay penalties and interest from the original due date, extension or no extension.
The Final Return and Beneficiary K-1s
The estate’s final Form 1041 covers the period from the start of its last tax year through the date of termination, meaning 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.4Internal Revenue Service. Forms 1041 and 1041-A: When to File
For a calendar-year estate that closes on July 1, the final tax year runs January 1 through July 1, and the return is due November 15. The executor checks the “Final Return” box to tell the IRS the entity no longer exists.
A Schedule K-1 goes 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 own returns, so a late final K-1 pushes problems onto them.
Quarterly Estimated Payments
Estates expecting to owe $1,000 or more for the year, after withholding and credits, generally have to make quarterly estimated payments on Form 1041-ES.8Internal Revenue Service. 2025 Instructions for Form 1041 and Schedules A, B, G, J, and K-1 For calendar-year estates, the installments are due April 15, June 15, September 15, and January 15 of the following year.9Internal Revenue Service. 2026 Form 1041-ES
Fiscal-year estates use a different schedule. Their installments fall on the 15th day of the 4th, 6th, and 9th months of the estate’s tax year, plus the 1st month of the following tax year.9Internal Revenue Service. 2026 Form 1041-ES An estate with an October 31 year-end, for example, would owe on February 15, April 15, July 15, and November 15.
There is a useful carve-out for newer estates. 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 Most estates close within that window and never make an estimated payment. For an estate that stays open longer, the quarterly schedule starts with the first tax year that ends after the two-year mark.
What Missing the Deadline Costs
Filing Form 1041 late without a valid extension triggers the failure-to-file penalty: 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 for inflation each year) or 100% of the tax due.
Unpaid tax carries its own 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 rate drops to 4.5% per month so the combined monthly hit stays at 5%. With an approved IRS payment plan, the failure-to-pay rate drops to 0.25% per month.
Interest accrues on top of penalties. The IRS sets underpayment rates quarterly at the federal short-term rate plus three percentage points, compounded daily.13Internal Revenue Service. Quarterly Interest Rates Penalties can be waived for reasonable cause; interest cannot. The only way to stop interest is to pay the balance.
Reasonable cause means a documented obstacle, such as waiting for a court order appointing the executor. Being busy or unaware of the deadline does not qualify.