IRS Authorized E-file Provider for Tax Extension Forms

State Personal Income
Tax Extension

Oklahoma Requires:

  • The state grants an extension if you already have an approved federal extension rather than requesting an extension using the state extension Form.
  • Alternatively, Individuals can file Form 504-I to request an Extension for Form 511 if they don't have an approved federal tax extension.
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File Form 4868 and Extend your 1040 Deadline up to 6 Months.

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An Overview of Oklahoma Personal Income Tax Extension

- Updated April 06, 2023 - 8.00 AM by Admin, ExpressExtension

Does Oklahoma support tax extension for personal income
tax returns?

Yes. The state of Oklahoma requires individuals to file a Federal Form 4868 rather than requesting a separate state
tax extension.

In case the federal tax extension Form 4868 was rejected, then the individuals can file State Tax extension Form 504-I.

What Form does the state of Oklahoma require to apply for
an extension?

Individuals in Oklahoma need to file Form 504-I with the state to get a 6-month extension of time to file their personal income tax returns 511 with
the state.

  • Form 504-I - Request For Extension Of Time For Filing Individual Tax Returns

Note: Make sure to pay any taxes due along with the extension Form to avoid penalties and interest.

When is the deadline to file Form 504-I with the state of Oklahoma?

Oklahoma State individual tax extension Form 504-I must be filed on or before the 15th day of the 6th month after the tax year ends (June 15 for calendar year filers).

How do I pay my balance due along with the extension Form?

If you owe Oklahoma state taxes, you must pay your tax due by the regular due date, or you will be charged with penalties and interest.

Make a tax payment with your extension using Form 511 (Estimated Tax Declaration Voucher) and attach it with
Form 504-I.

To pay electronically, visit State payment options.

You can also pay the tax due online using or mailing
your Form.

Mailing Address for filing Extension with
the State?

Where do I mail the extension
Form 504-I?

Address Icon
Oklahoma Tax Commission
Income Tax
P.O. Box 26890,
Oklahoma City,
Oklahoma 73126-0890

Where do I mail the Form 511?

Address Icon
Oklahoma Tax Commission
Income Tax
P.O. Box 269045,
Oklahoma City,
Oklahoma 73126-9045.