The answer to all 4 questions is June 15th. Both the IRS and the Oklahoma Department of Revenue will not consider your return late if you file by June 15th. However, due to system constraints it will not be possible to set up a payment to either the IRS or Oklahoma for a post-date after May 17th. If you wish to file before June 15th but pay up until June 15th you will need to either mail in the payment, or pay online.
You can pay online with the IRS at this website: Direct Pay | Internal Revenue Service
For Oklahoma, see this website: Oklahoma Tax Commission - Filing and Paying Taxes
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