State of Oklahoma
Personal Income Tax Extensions
Oklahoma Filing Due Date: OK individual income tax returns are due by April 15 — the same due date as the Federal individual tax return. However, individuals who electronically file (“e-file”) have until April 20 to submit their Oklahoma tax return.
Extended Deadline with Oklahoma Tax Extension: Oklahoma offers extensions for one-half of the accounting period covered by the return. An individual tax return covers a 1-year period (usually the calendar year, January 1 to December 31), which means an Oklahoma extension will provide 6 extra months to file. This moves the individual filing deadline from April 15 to October 15.
Oklahoma Tax Extension Form: To request an Oklahoma extension, file Form 504 by the original due date of your return.
NOTE: If you have an approved Federal tax extension (IRS Form 4868), you will automatically be granted an Oklahoma tax extension.
Oklahoma Extension Payment Requirement: A tax extension gives you extra time to file. It does not give you more time to pay your Oklahoma income tax. All state tax payments are due by the original deadline of the return (April 15 for most). Any OK tax that isn’t paid by the proper due date will be subject to interest and penalties. In order to get an Oklahoma tax extension, at least 90% of your state tax liability must be paid on time. You can make an Oklahoma extension payment with Form 504, or pay electronically using Oklahoma Online Services: www.tax.ok.gov/payments