When To File

For calendar year estates and trusts, file Form 1041 and Schedule(s) K-1 by April 15, 2026 .

For fiscal-year estates and trusts, file Form 1041 by the 15th day of the 4th month following the close of the tax year. For example, an estate that has a tax year that ends on June 30, 2026, must file Form 1041 by October 15, 2026. If the due date falls on a Saturday, Sunday, or legal holiday, file on the next business day.

Extension of Time To File If more time is needed to file the estate or trust return, use Form 7004, Application for Automatic Extension of Time To File Certain Business Income Tax, Information, and Other Returns, to apply for an automatic 5 ¹ /2-month extension of time to file.