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.
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.68 Okla. Stat. §§ 2355, 2362, 2368, 2375; § 804.1Verified Jul 13, 2026 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).68 Okla. Stat. §§ 2355, 2362, 2368, 2375; § 804.1Verified Jul 13, 2026 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 The estate tax was repealed for deaths on or after January 1, 2010 (Laws 2006, 2nd Extra.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.68 Okla. Stat. §§ 2355, 2362, 2368, 2375; § 804.1Verified Jul 13, 2026 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.
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Prepare the creditor notice for an estate — the official state form or a notice typeset to statute, plus mailed notices for known creditors.
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Prepare the affidavit that collects a small estate's property without probate — the official state form or an affidavit drafted to statute, plus a presentation letter for each holder.
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Prepare the paperwork that closes the estate — the state's closing statement, petition for discharge, or final account, with the state's closing instructions and the optional federal forms.
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Prepare the letter of instruction a bank or insurer requests during estate settlement.
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