Oklahoma (OK) State Tax Forms 2019

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Prepare and efile Your Oklahoma Tax Return Forms

Our tax software makes it easy for you to efile your state tax return and use the correct state tax forms. Prepare and efile your Oklahoma state tax return (resident, nonresident, or part-year resident) and Federal tax return together or separately. View the federal tax return filing requirements.

Oklahoma Income Tax Filing Deadline

income tax filing

The regular deadline to file an Oklahoma state income tax return is April 15. However, if you efile your return through a tax preparer or an online tax vendor, your due date will be extended to April 20. Any payment of taxes due on April 20 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 the original due date.

Tax Deadline Date Type of Income Tax Return Filing Deadline / Due Date Description
April 18, 2019 2018 Oklahoma State Tax Return Due date for Oklahoma State Income Tax Returns – income tax filing deadline
April 18, 2019 2018 Oklahoma State Tax Extension Due date for Oklahoma extensions
October 15, 2019 2018 Oklahoma State Tax Return Last day to efile a 2018 Oklahoma State Income Tax Return for tax extension filers and late efilers

View all state tax return filing deadlines.

Find federal income tax return filing deadlines.

Oklahoma State Tax Forms that Can Be efiled

We supports all of the forms that Oklahoma allows to be efiled. You can efile any of the following Oklahoma state tax forms:

Form/Schedule Description Can I efile this form?
Form 511/511NR Individual Income Tax Return-Resident, Nonresident/Part-Year
Form 511-B/511NR (Schedule A) Individual Income Tax Return-Resident, Nonresident/Part-Year-Additions
Form 511-A/511NR (Schedule B) Individual Income Tax Return-Resident, Nonresident/Part-Year-Subtractions
Form 511/511NR (Schedule C) Adjustments
Form 511/ 511NR (Schedules G and F) Donations from Refund
Form 511CR Other Credits (Pages 1-3)
Form 511TX Credit to Tax Paid to Another State
Form 538H Property Tax Credit
Form 538S Sales Tax Relief Credit
Form OK Use Tax
Form OK – 2210-OW-8-P Underpayment of Estimated Taxes

How to File an Oklahoma Tax Amendment Forms

When Do I Need to File My Oklahoma State Tax Amendment?

The amended tax return should be filed within 3 years of the filing deadline for the original tax return, or 2 years from the time when tax was paid, whichever is later.

How Do I Fix My Accepted Oklahoma Tax Return or File an Amendment in Oklahoma?

According to Oklahoma tax law, if you or the IRS made changes to your federal income tax return, then you must file a tax amendment form. Before filing the form, if you wish to avoid delays with your Oklahoma tax amendment, you must make sure to have confirmation from the IRS that the changes to your federal income tax return have been processed.

You have two options to file your amended Oklahoma tax return:

  1. Download and complete Form 511 (residents) or Form 511NR (nonresidents and part-year residents). When you’re done, print out the form and mail it to: Oklahoma Tax Commission, Post Office Box 26800, Oklahoma City, OK 73126-0800 OR
  2. efileTaxPro by efile.comFile your Oklahoma state tax amendment with the help of an efile TaxPro! Enjoy all the benefits of working with a TaxPro, including:
  • Having your questions answered from a licensed tax professional!
  • Enjoying the peace of mind that your taxes are being handled by a professional!

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