OK does not have a separate form for amend so you have to be more careful. You may not actually need to file an amended return. I have underlined parts relevant to you from OK Instructions which state:
If you discover you have made an error only on your Oklahoma return, we may be able to help you correct the form
instead of filing an amended return. For additional information, contact our Taxpayer Resource Center at 405.521.3160.
HOW TO COMPLETE AN AMENDED RETURN
Place an “X” in the Amended Return checkbox at the top of Form 511, page 1. Complete the amended return. Enter any
amount(s) paid with the original return plus any amount(s) paid after it was filed on line 30. Enter any refund previously
received or overpayment applied on line 32. Complete Schedule 511-I “Amended Return Information” on Form 511.
WHEN YOU ARE FINISHED
Provide a copy of the following supporting documents, if applicable. Failure to provide the supporting documents may
delay the processing of the return.
• Form 1040X (Amended Federal Income Tax Return) or Form 1045 (Application for Federal Tentative Return),
• Proof that IRS has approved the claim, such as the statement of adjustment, IRS tax account transcript, any correspondence from IRS, or the deposit slip of your federal refund,
• Revenue Agent Report (RAR), CP2000 or other notification of an assessment or a change made by the IRS,
• Additional Forms W-2 or 1099 not furnished with original return, and
• Forms, schedules or other documentation to substantiate any change made on the amended return.
See another post of mine for mailing a tax return.
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