Who fills this out
The personal representative (executor or administrator) files the 1041 for an estate. The trustee files for a trust. A CPA or attorney usually prepares it; the fiduciary signs.
When to file
Due by the 15th day of the 4th month after the end of the estate's or trust's tax year. Estates can elect a fiscal year ending up to 11 months after death; trusts must use a calendar year. A 5.5-month extension is available on Form 7004.
What you will need
- Estate or trust EIN (from Form SS-4).
- 1099s and K-1s issued to the estate or trust.
- List of distributions to beneficiaries.
- Beneficiary names, addresses, and SSNs (for Schedule K-1).
- Allocation of expenses between the estate and beneficiaries.
Common mistakes
- Mixing personal and estate income. Income earned before death goes on the decedent's final 1040; income earned after death goes on Form 1041.
- Missing the EIN. The estate needs its own EIN; do not use the decedent's SSN on the 1041.
- Skipping the fiscal-year election. Estates often save tax by choosing a fiscal year that defers income to a later K-1.
- Reporting distributions wrong. Distributions carry out distributable net income to beneficiaries on K-1 and reduce the estate's tax.
Questions families ask
Does my revocable living trust need a 1041 while I am alive?
No. While the grantor is alive, a revocable trust is a grantor trust; income flows to the grantor's 1040. The 1041 begins the year after the grantor dies.
How long do I file Form 1041?
Every year until the estate or trust closes. Most Arizona estates file 1-3 returns; long-running trusts file for decades.
Related forms
IRS Form 706 is the federal estate tax return filed by the personal representative of a U.S. decedent whose gross estate plus prior taxable gifts exceeds the federal exemption ($15 million per person in 2026). It is also filed at any value to elect portability of a deceased spouse's unused exemption. The return is due 9 months after death; a 6-month extension is available on Form 4768.
IRS Form SS-4 applies for an Employer Identification Number for an estate, an irrevocable trust, or a revocable trust that became irrevocable at the grantor's death. The personal representative or trustee applies online at IRS.gov and receives the EIN immediately. Every Arizona estate and most post-death trusts need one before opening an estate bank account or filing Form 1041.