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Informational Notice
April 14, 2009

Income Tax Due Date Information

Generally, your Oklahoma income tax return is due April 15th, the same day as your Federal return.


  • If you file your return electronically (through a preparer or the internet), your due date is extended to April 20th. Any payment of taxes due on April 20th must be remitted electronically in order to be considered timely paid. If the balance due on an electronically filed return is not remitted electronically, penalty and interest will accrue from April 15th.
  • If the Internal Revenue Code of the IRS provides for a later due date, your return may be filed by the later due date and will be considered timely filed. You should write the appropriate “disaster designation” as determined by the IRS at the top of the return, if applicable. If a bill is received for delinquent penalty and interest, you should contact the Account Maintenance Division of the Oklahoma Tax Commission at the number on the bill.
  • If the due date falls on a weekend or legal holiday, your return is due the next business day. Your return must be postmarked by the due date to be considered timely filed.

Related Link: Additional information: IRS Tax Relief in Disaster Situations

Related Link: Additional information: Oklahoma County, Logan County, Carter County IRS deadlines



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Last Modified 4/14/2009


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