State of Oklahoma Personal Income Tax Extensions

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General Instructions

Oklahoma personal tax returns are due by the same date as your Federal tax return — usually April 15 for calendar year filers. [Note: Taxpayers who file their Oklahoma returns electronically have until April 20 to e-file their return.] If you cannot file by this date, you can get a state tax extension.

The State of Oklahoma recognizes the Federal tax extension (IRS Form 4868). Therefore, if you have a valid Federal extension, you will automatically receive a corresponding Oklahoma extension. Make sure to enclose a copy of your Federal extension with your Oklahoma tax return when it’s filed.

If you do not have a Federal extension, or if you owe Oklahoma income tax, you can request an Oklahoma tax extension with Form 504 (Application for Extension of Time to File an Oklahoma Income Tax Return). You must file Form 504 (with payment, if applicable) by the original deadline of your return (April 15). Remember to enclose a copy of your Oklahoma extension with your tax return when it’s filed.

A tax extension gives you more time to file, not to pay. At least 90% of your Oklahoma tax due must be paid by the original deadline (April 15) if you want to get a state tax extension. To make your Oklahoma extension payment electronically, go online to the Electronic Payment Options portal: www.tax.ok.gov/payments

NOTE: If you make the Oklahoma extension payment electronically, do not file Form 504.

For more information, please visit the Oklahoma Tax Commission website: www.tax.ok.gov

Oklahoma State Income Tax Payment Forms


Form 504 (Application for Extension of Time to File an Oklahoma Income Tax Return)


Mail to the following address:

Oklahoma Tax Commission

Income Tax

P.O. Box 26890

Oklahoma City, Oklahoma  73126-0890