Yes. File your amended Oklahoma income tax return by mail. Not all states are set up to accept e-filed state returns.
The due date for Oklahoma taxes is April 18. You have a month. Your federal may come in before that.
You can also set up a payment plan on OKTAP. There will be a one–time delinquent penalty of 5% and interest accruing at 1.25% per month on any tax not paid by the original due date.
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