How do you handle taxes for a deceased taxpayer in 2026?

Every few weeks a client calls our Los Angeles office within days of losing a parent or spouse. The first questions are rarely about taxes — they are about bank access, Social Security, and what to tell the funeral home. But once those are handled, a quieter list begins: the IRS still expects a return from the deceased taxpayer, and the person taking charge of the estate has a short window to set up the paperwork that makes the rest of the year manageable. This post walks through the IRS forms the personal representative actually needs, in the order they come up, with the deadlines that matter in 2026 and 2027.

Who is responsible for a deceased taxpayer’s return? 👤

A personal representative — an executor, administrator, or anyone in actual or constructive possession of the decedent’s property — files the decedent’s final individual return. A surviving spouse filing jointly can sign where no representative has been appointed.

Under IRC §6012, the person required to make the return of a decedent is the executor, administrator, or other person charged with the decedent’s property. In practice, this is whoever the probate court appoints. Where probate has not yet opened, the IRS still expects a return from the person actually in charge of assets — a surviving spouse who has access to the bank and brokerage accounts, or a family member holding the decedent’s papers. IRS Publication 559 calls this role the “personal representative” and treats appointed executors, administrators, and anyone in actual or constructive possession of the decedent’s property as equivalent for filing purposes.

The signature line on the decedent’s final Form 1040 reflects this. If the representative was court-appointed, that person signs and writes “Personal Representative” after the signature. If a surviving spouse is filing a joint return and no representative has been appointed, the surviving spouse signs for both and writes “Filing as surviving spouse” in the decedent’s signature area. Across the top of the return, the preparer writes the word “Deceased,” the decedent’s name, and the date of death — a small detail that stops IRS automated systems from treating the return as ordinary.

How does Form 56 change the IRS relationship? 📝

Form 56 puts the IRS on notice that a fiduciary now stands in the taxpayer’s place, so notices, transcripts, and correspondence can be sent to the representative instead of to the decedent’s last address.

The statutory hook is IRC §6903, which requires any fiduciary to notify the IRS before assuming the duties of the predecessor. Form 56 is the vehicle. File it as soon as the representative is appointed, or as soon as the representative begins acting if no court appointment is involved. The form asks for the decedent’s name and TIN, the date and nature of the fiduciary relationship, and whether the fiduciary is acting for the individual decedent, for the estate, or for both. In most deceased-taxpayer cases the answer is both — one filing covers the final 1040 and the estate’s 1041 relationship.

Form 56 is not the same thing as a power of attorney. A POA on Form 2848 authorizes a specific person (an attorney, CPA, or enrolled agent) to represent the taxpayer before the IRS; it does not take over mail or signature authority. For a deceased taxpayer, the representative files Form 56 to assume the role, and may additionally file Form 2848 to let the CPA speak to the IRS during an exam or collection matter. Both can be filed together.

What IRS records does the representative need first? 📂

Prior-year transcripts on Form 4506-T, full return copies on Form 4506 when the attachments matter, and an address change on Form 8822 so the mail stops going to the decedent’s old home.

Nine out of ten deceased-taxpayer engagements open with the same bottleneck: nobody can find last year’s return. The decedent may have filed on paper, kept copies in a filing cabinet that is now locked, or used a preparer who has retired. The IRS keeps the record. Form 4506-T produces a free transcript — a line-by-line summary of Form 1040 along with Forms W-2, 1099, and 1098 the IRS received. A transcript is usually enough to rebuild a final return and to confirm what prior-year carryovers are in play.

Where the attachments matter — a return with a detailed Schedule D, a foreign-reporting Form 8938, or a state tax detail that only lives on the full return — Form 4506 provides a complete copy for a fee per year. Either form must be accompanied by proof of authority: court letters of appointment or a filed Form 56, plus the decedent’s identifying information. Without that, the request is rejected.

Mail is the other blind spot. The decedent’s address of record is wherever the last return was filed, and the IRS keeps using it. Form 8822 changes that to the representative’s address — important for the final 1040, for any estate 1041, and for the IRS CP notices that often arrive six to nine months after death. File Form 8822 at the same time as Form 56.

Which tax returns does a deceased taxpayer file? 🗂️

A final individual Form 1040 for the year of death (and any unfiled prior-year returns), plus a Form 1041 for the estate in each year the estate has $600 of gross income or a nonresident alien beneficiary.

The split between the decedent and the estate is a different taxpayer line, not a different taxpayer year. On the decedent’s side, the final Form 1040 reports income from January 1 up to and including the date of death. On the estate’s side, a new taxpayer — the estate itself — reports income from the day after death forward. The estate gets its own EIN (requested on Form SS-4) and its own return, Form 1041. IRS final income tax returns of a deceased person walks through the basic sequencing.

The estate’s first tax year is a choice. Under IRC §441, the executor can elect a calendar year or a fiscal year ending on the last day of any month, provided that first year is twelve months or less. In many cases, a fiscal year ending the month before the first anniversary of death defers beneficiary K-1 income to a later personal return and gives the family planning room. The election is made by filing the first 1041 on that basis — once filed, the estate’s year is set.

Two returns that often get skipped. First, any unfiled prior-year Form 1040s — if the decedent fell behind in the last years of life, the representative is responsible for catching those up. Second, state returns that follow the same sequencing: California Form 540 as the final return plus Form 541 for the estate when the estate has California-source income or a California resident beneficiary.

What are the key deadlines for a 2026 deceased taxpayer? 🗓️

The final 2026 Form 1040 is due April 15, 2027, with the usual six-month extension on Form 4868. Form 706 (if required) is due nine months after the date of death, and the estate’s first 1041 depends on the fiscal year election.

1. Final Form 1040. Due April 15 of the year after death. For a 2026 decedent, that is April 15, 2027. The extension to October 15 is available on Form 4868 and must be filed by April 15.
2. Form 706 (if required). Due nine months after the date of death. A six-month extension is available on Form 4768. The 2026 basic exclusion is $15,000,000; most families will not file Form 706, but a portability election to preserve a deceased spouse’s unused exclusion requires a timely-filed 706 regardless of value — this is a common missed opportunity.
3. Form 1041 (first year). Due the 15th day of the fourth month after the close of the estate’s tax year. For a calendar-year estate of a 2026 decedent, that is April 15, 2027. For a fiscal-year estate, the date shifts.
4. Form 56. No statutory deadline, but file as soon as the fiduciary begins acting. Mail and notices do not redirect until it is on file.

What are the most common deceased taxpayer filing mistakes? ⚠️

Missing the Form 56 filing, filing on the wrong EIN (decedent’s SSN versus estate EIN), skipping the “Deceased” notation at the top of the final 1040, and overlooking state returns.

Across hundreds of deceased-taxpayer engagements, a short list of errors accounts for most of the corrections. All of them cost the family time, and some cost money. Each is avoidable with a checklist and an early call to the CPA.

• Not filing Form 56. The result is that IRS notices continue to arrive at the decedent’s last address and the representative learns about an assessment months late. File at the same time as the address change.
• Reporting estate income on the final 1040. Income received after the date of death belongs on Form 1041, not on the decedent’s final return. The usual culprit is a brokerage 1099 that reports a full calendar year under the decedent’s SSN; the custodian needs to be told to re-issue the portion after death under the estate’s EIN, or the final return needs a nominee adjustment.
• Missing the “Deceased” notation. Without the word “Deceased,” the decedent’s name, and the date of death across the top of Form 1040, the return is treated as a routine filing. Correspondence then goes to the decedent’s address and refunds may be held.
• Missing the state return. California, like most states, piggybacks on the federal treatment. The final Form 540 and any Form 541 follow the same sequencing. A federal-only filing leaves a state balance open and starts the state statute of limitations running late.
• Missing the portability election. Covered above — this is the single most expensive omission we see at middle-wealth families, and the one most often missed because the $15,000,000 threshold feels far away.

Frequently asked questions about a deceased taxpayer ❓

Q. Who files the final return for a deceased taxpayer?

The personal representative — an executor, administrator, or anyone in actual or constructive possession of the decedent’s property — is required to file the decedent’s final Form 1040. If there is no appointed representative and the decedent was married, a surviving spouse filing jointly can sign the return. Where neither applies, any person in charge of the property signs. The representative uses Form 56 to put the IRS on notice of the fiduciary relationship.

Q. What is the deadline for a deceased taxpayer’s final 1040?

The final individual return is due on the same date it would have been due if the decedent had lived — generally April 15 of the year after death, with the usual six-month extension on Form 4868 available. For a decedent who died in 2026, the final 2026 Form 1040 is due April 15, 2027. A short-period return is not required for the decedent on the individual side; the full year up to the date of death is reported.

Q. When does the estate need to file Form 1041?

A separate estate income tax return on Form 1041 is required for any tax year the estate has gross income of $600 or more, or has a beneficiary who is a nonresident alien. The estate’s first tax year begins the day after death and may be a calendar year or a fiscal year chosen on the first return. The $600 threshold is on gross income, not net, so even a passthrough K-1 or a brokerage dividend can trigger the filing.

Q. How do I get past tax records for someone who has died?

A free tax return transcript for most recent years can be requested on Form 4506-T; a complete copy of a return (useful when attachments or state detail are needed) is requested on Form 4506 for a fee. The representative must attach proof of authority — either court letters of appointment or Form 56 — along with the decedent’s identifying information. Transcripts are mailed to the decedent’s address of record, which is one reason to also file Form 8822.

Q. Does a refund on the final return go to the estate or to a relative?

A refund on the final Form 1040 is estate property. If a court-appointed representative is filing, the refund is paid to the representative on behalf of the estate. Where there is no appointed representative and a non-spouse is claiming the refund, Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer, is attached to the return. A surviving spouse filing a joint return does not file Form 1310.

Q. Does the Social Security Administration tell the IRS about a death?

The Social Security Administration generally receives death information from the funeral director and shares it with the IRS, which is what prevents a Social Security number from being used fraudulently on a later return. Even so, the representative should not rely on that handoff for timely IRS correspondence — mail still goes to the decedent’s last address unless Form 8822 is filed, and fiduciary notices only reach the representative after Form 56 is on file.

This article is general information, not tax or legal advice for your situation. Decedent and estate filings turn on facts, state law, and timing. For a confidential review, contact SW Accounting & Consulting Corp — our Los Angeles team handles federal and California deceased-taxpayer compliance together.

Additional reading at the IRS: IRS deceased person page.