You cannot eFile an OK Tax Amendment anywhere, except mail it in. However, you can prepare it here on eFile.com.
Sign into your eFile.com account, modify your Return
and download/print the OK Form 511 (residents) or 511NR (nonresidents and part-year residents) under My Account
Place an “X” in the Amended Return check-box at the top of the form. On Form 511, you should enter any amounts you paid with your original, accepted return, plus any amounts paid after it was filed on line 30. Report any refunds that were previously received or overpaid to you on line 32. Fill out Schedule 511-I ("Amended Return Information) on Form 511, page 6.
For Form 511NR, enter tax previously paid and/or previously underpayments on lines 31 and 33. You should also complete Schedule 511NR-H.
If you don't have an eFile.com account follow the step by step instruction on how to prepare a tax return/amendment
: If you want to do the math on your own paper return then complete, sign OK Form 511 or Form 511NR
- Print, Mail the Form to OK Department of Finance and Administration to:
Oklahoma Tax Commission
Post Office Box 26800
Oklahoma City, OK 73126-0800