where do you mail oklahoma tax return
Important Reminder! If you are filing an Oklahoma tax amendment, you may need to file a federal tax amendment as well. 2013 Oklahoma Tax Forms Oklahoma tax returns for 2013 cannot be prepared and filed online. Download the tax forms, complete them, print them out, and mail them to the Oklahoma Tax Commission.klahoma Income Tax Filing Deadline. 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.