How Do I File Taxes for a Deceased Person in Oklahoma?

Find out which tax returns you need to file after someone dies. See state-specific forms, deadlines, and whether tax clearance is required.

More than the returns? Settle the estate in one place.

State

Approximate Estate Value

Estate earns income

Interest, dividends, rent, or other income received after date of death

Oklahoma Tax Filing Checklist

2 filings required

0 of 2 completed0%

Federal

File final income tax return

A final federal income tax return is required for income earned from January 1 through the date of death.

Form: IRS Form 1040

Deadline: April 15 following year of death

Write "DECEASED," the decedent's name, and the date of death across the top of the return. If filing jointly with a surviving spouse, include both incomes. Attach Form 1310 to claim a refund, unless you are the surviving spouse filing a joint return or a court-appointed personal representative attaching a copy of the court certificate to the original return.

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File estate income tax returnNot required

IRS Form 1041 is only required if the estate earns $600 in gross income or more during administration.

File estate tax returnNot required

The estate value ($0) is below the federal exemption of $15,000,000. IRS Form 706 is generally not required.

Oklahoma

File final income tax return

A final state return is required for income earned through the date of death.

Form: Form 511 (Oklahoma Resident Individual Income Tax Return)

Deadline: April 15 following year of death (April 20 if filed electronically)

The executor, administrator, or surviving spouse files the decedent's final Form 511. OTC's instruction is verbatim: "If a taxpayer died before filing a return, the executor, administrator, or surviving spouse may have to file a return for the deceased. Place an 'X' in the appropriate box in the SSN area." The return also carries a dedicated date-of-death field ("If deceased in 2025 or 2026, enter date of death"). Oklahoma does NOT instruct filers to write "Deceased" across the return — do not add that. Top rate 4.5% for TY 2026 (68 O.S. § 2355(D)). A valid federal extension automatically extends the Oklahoma due date if no Oklahoma liability is owed (attach a copy of the federal extension); otherwise request an extension on Form 504-I. At least 90% of the liability must be paid by the original due date to avoid a delinquent-payment penalty. 68 Okla. Stat. §§ 2355, 2368, 2375.

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File estate income tax returnNot required

A fiduciary return is only required if the estate earns income above the filing threshold (Every resident estate or trust must file. Nonresident estates/trusts file Form 513-NR if they have Oklahoma taxable income (rents/royalties, business, partnership or S-corp income, or sales of Oklahoma real property) — 68 Okla. Stat. § 2368(G), § 2362).

Tax Clearance Not Required

Oklahoma does not require a state tax clearance certificate for estate distribution. The estate tax was repealed for deaths on or after January 1, 2010 (Laws 2006, 2nd Extra. Sess., c. 42, § 6 (HB 1172), repealing 68 O.S. §§ 801–803 and 805–825). By statute, no estate tax lien attaches for deaths on or after January 1, 2010, and "no order exempting estate tax liability shall be necessary to authorize the release of such property or for the title of real property to be marketable" (68 O.S. § 804.1). Oklahoma has no separate inheritance tax.

This tool provides general information about tax filing requirements after death. Tax situations vary based on individual circumstances. Consult a licensed tax professional or CPA for advice specific to your situation.

Frequently Asked Questions

At minimum, a final federal income tax return (Form 1040) and a final Oklahoma income tax return (Form 511 (Oklahoma Resident Individual Income Tax Return)) must be filed for income earned through the date of death. If the estate earns income during administration, a federal fiduciary return (Form 1041) and Oklahoma fiduciary return (Form 513 (Oklahoma Resident Fiduciary Income Tax Return)) may also be required.

The final federal and Oklahoma income tax returns are due april 15 following year of death (april 20 if filed electronically). The fiduciary return is due april 15 for calendar-year estates; 15th day of the 4th month following close of the taxable year for fiscal-year estates. extension on form 504-c.

No. Oklahoma does not require a state tax clearance certificate for estate distribution. The estate tax was repealed for deaths on or after January 1, 2010 (Laws 2006, 2nd Extra. Sess., c. 42, § 6 (HB 1172), repealing 68 O.S. §§ 801–803 and 805–825). By statute, no estate tax lien attaches for deaths on or after January 1, 2010, and "no order exempting estate tax liability shall be necessary to authorize the release of such property or for the title of real property to be marketable" (68 O.S. § 804.1). Oklahoma has no separate inheritance tax. All tax obligations must be satisfied before making final distributions.

Yes. Estate size does not affect the requirement to file a final income tax return. A final Form 1040 is required regardless of estate value if the deceased had income. What smaller estates typically avoid is the federal estate tax return (Form 706).

The executor named in the will (or the court-appointed administrator) is responsible for filing the final income tax return and any estate tax returns. If the deceased was married, the surviving spouse can file a joint federal return for the year of death. For trust assets, the successor trustee handles fiduciary tax returns. The Oklahoma estate settlement plan covers all filing responsibilities in order.

No. Oklahoma does not impose a state estate tax or inheritance tax. The primary tax filings after death are income tax related (final return and, if applicable, estate income tax return). See how Oklahoma compares with the death tax calculator.

Tax Filing After Death in Oklahoma

Tax obligations in Oklahoma include filing the deceased's final state and federal income tax returns. If the estate generates income (interest, dividends, rent) before distribution, a fiduciary return is also required. A federal estate tax return (Form 706) is required only for estates above the federal exemption of $15,000,000.

Oklahoma does not impose a state estate tax or inheritance tax. The primary post-death tax obligations are income tax related — the final return and any fiduciary returns needed during estate administration.

Missing tax deadlines can result in penalties and interest that reduce the estate's value. The estate settlement plan for Oklahoma includes all filing dates so nothing is overlooked.