Last verified 2026-08-13; facts checked against the primary sources below

How to file final federal and California tax returns after someone dies

Last verified: August 13, 2026

The short answer: File the deceased person's final federal Form 1040 or 1040-SR and, if California requires a return, Form 540 for the year of death, reporting the person's income and deductions through the date of death. Keep post-death estate income separate: it may require federal Form 1041 and California Form 541 under the estate's EIN, and those are not substitutes for the final individual returns.

The final return is an individual income-tax return. It is different from a federal estate-tax return, Form 706, and from the estate's fiduciary income-tax returns.

Which return reports which income?

Return	Taxpayer	What it generally covers
Federal Form 1040 or 1040-SR	The person who died	Individual income and deductions through the date of death
California Form 540	The person who died	California individual income and deductions through the date of death, when a California return is required
Federal Form 1041	The probate estate	Income received or earned by estate assets after death under fiduciary-income-tax rules
California Form 541	The estate	California fiduciary income of the estate
Federal Form 706	The gross estate for federal transfer-tax purposes	A separate estate-tax filing that applies only when its own requirements are met

The IRS says the final individual return and the estate income-tax return are separate filings (IRS estate-administrator guidance). California's FTB says death ends the person's tax year and begins the estate's tax year, and directs estates to Form 541 (FTB deceased-person guidance).

Who files and signs the final returns?

Situation	Federal return	California return
Court-appointed personal representative	Files and signs in the representative capacity; follow Form 1040 instructions for a joint return	Administrator or executor files and signs under FTB instructions
Surviving spouse	May be able to file jointly for the year of death if federal requirements are met	A surviving spouse or registered domestic partner may be able to file jointly under FTB's stated conditions
No appointed representative or spouse	The person in charge of the deceased person's property may have filing responsibility	FTB lists an administrator, executor, or beneficiary as responsible when a return is required

Authority for tax filing is not identical to authority to administer probate assets. If a court probate is required, California general estate-administration power begins when Letters issue. Coordinate the filing role with the probate lawyer and tax preparer.

What is included on the final individual returns?

Start with the same filing analysis used if the person were alive, then cut off the tax period at death.

Gather Forms W-2, 1099, K-1, retirement, Social Security, brokerage, business, and rental records.
Identify income received or earned before death under the taxpayer's accounting method.
Separate income attributable to the estate after death rather than forcing every year-end Form 1099 onto the final Form 1040.
Claim only deductions and credits allowed on the final individual return.
Check prior years. Both the IRS and FTB state that past-due returns may also need to be filed.

The IRS directs filers to prepare the final Form 1040 or 1040-SR generally as though the person were alive, reporting income through death and allowable credits and deductions (IRS final-return guidance). The FTB explains that a cash-method taxpayer reports income actually received before death and expenses paid before death, while an accrual-method taxpayer follows accrual rules (FTB deceased-person guidance).

Income in respect of a decedent and split year-end tax forms can be technical. Do not allocate income solely from the date printed on a Form 1099; have a tax professional trace when the right to the income arose and who received it.

When are the final returns due?

The final federal and California individual returns are due when the deceased person's returns would have been due if the person had lived. The IRS states that a calendar-year final return is generally due on the regular filing date following the year of death and may be extended under the ordinary process (IRS Publication 559). FTB uses the same basic rule for its final return (FTB deceased-person guidance).

Check the official filing instructions for the actual tax year. Weekends, holidays, disaster relief, extensions, fiscal years, and military rules can change a calendar date.

How do you mark and sign a paper return?

For a federal paper return, IRS Publication 559 instructs the filer to write "DECEASED," the person's name, and date of death across the top. The appointed representative signs; a surviving spouse also signs a joint return. E-filed returns follow the tax software's deceased-taxpayer and signature instructions (IRS Publication 559).

For California, print or type "Deceased" and the date of death next to the taxpayer's name at the top, then sign in the applicable representative or surviving-spouse capacity (FTB deceased-person guidance).

What if information returns are missing?

An authorized estate administrator, executor, or personal representative may request a deceased person's IRS transcript or return information. The IRS requires the deceased person's identifying information, a death certificate, and proof of authority such as court-approved Letters or Form 56 with the Letters, depending on the request (IRS request guidance).

Use Form 4506-T for transcripts. Do not assume an online transcript request will come to the representative; the IRS says an online-requested transcript is mailed to the deceased person's address of record.

How do you claim a refund?

Return	What to check
Federal	IRS Form 1310 and its instructions; the attachment requirement depends on whether the filer is a surviving spouse, court-appointed representative, or another representative
California	FTB instructs a person claiming a deceased taxpayer's refund to attach the required death-certificate documentation and IRS Form 1310, with additional proof based on the filer's capacity

The IRS final-return page directs refund claimants to Form 1310 (IRS final-return guidance). Follow the current form instructions instead of assuming that every filer attaches the same documents. FTB's current deceased-person page lists its California refund documentation (FTB guidance).

When does the estate need its own income-tax return?

After death, interest, dividends, rent, and sale income generated by estate assets may belong to the estate. The IRS requires Form 1041 when a domestic estate has more than $600 of annual gross income, subject to the full Form 1041 rules. The estate needs its own EIN (IRS estate-income-tax guidance).

California directs estates to Form 541 and requires California-source analysis for nonresident decedents' estates (FTB deceased-person guidance). Do not use the deceased person's Social Security number for estate income. See how to obtain an EIN and open the estate account.

A clean filing workflow

Determine who has authority and who will sign.
Obtain prior returns, transcripts, and year-of-death tax documents.
Create a date-of-death cutoff schedule for each income source.
Separate individual income from post-death estate income.
Prepare the final federal and California individual returns.
Prepare Forms 1041 and 541 if required.
Reserve estate cash for balances due before making distributions.
Save filed returns, acceptance notices, proof of payment, refund documents, and allocation workpapers with the estate accounting.

Taxes belong in the estate's broader payment analysis. Do not distribute cash or pay lower-priority claims without reviewing California's estate-debt priority rules.

Frequently asked questions

Is the final Form 1040 the same as Form 1041?

No. Form 1040 or 1040-SR reports the deceased person's individual tax period through death. Form 1041 reports qualifying post-death income of the estate.

Does every estate file Form 706?

No. Form 706 is a separate federal estate-tax return with its own filing threshold and other filing rules. Do not confuse it with the final Form 1040 or estate Form 1041.

Do I attach a death certificate to the federal Form 1040?

The IRS does not generally require a death certificate merely to notify it on the final income-tax return. Proof requirements can apply to information requests and refund claims, so follow the instructions for the specific form.

What if the person died before filing last year's return?

The prior-year return is still a regular return that may need to be filed. The return covering January 1 through the date of death is the final return for the year of death.

Can the estate pay the tax?

The representative handles valid balances under the applicable tax and estate rules. Preserve enough estate cash and classify government claims correctly before beneficiary distributions.

This is general tax-administration information, not tax or legal advice. A CPA, enrolled agent, or tax lawyer should review income allocation, community income, basis, business interests, property sales, foreign assets, large gifts, and estate-tax filing questions.

The Estate Desk handles this for California families. theestatedesk.com