It depends, if you have a credit for employees in the Aerospace Sector and you have a credit amount on Oklahoma Form 511CR, Line 16, Column C (Credit for Employees in the Aerospace Sector), then you must file Form 564. If this is the case, Form 564 is not supported for e-file; the whole Oklahoma return must be printed and filed by mail. To file your state return, print it and mail to the appropriate taxing authority.
If you do not qualify for this credit, then review your Oklahoma return, and submit your return electronically.
State of Oklahoma Other Credits Form
