"I know you can carry over whatever you didn't use from the previous year,"
If it can be carried forward, it isn't refundable.
If it were refundable, there would never be anything to carry forward.
It is available the first 5 years of employment, so if you were eligible last year, you would need to file an Amended 2021 Oklahoma state return.
It would not affect your 2021 Federal Return.
If you Itemized Deductions on your 2021 Federal return, and this amendment results in a state refund, you MAY need to claim income for that refund on your 2023 tax year return.
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