Unfortunately, Oklahoma can't accept the requested proof for this deduction via an e-filed return. You'll need to print out Oklahoma's Form 511EF from TurboTax and mail that in with the documentation they request.
For information on the proof requested, please see "Contributions to Oklahoma 529 College Savings Plan and OklahomaDream 529 account(s)" on page 17 of 2019 Oklahoma Resident Individual Income Tax Forms and Instructions.
**Say "Thanks" by clicking the thumb icon in a post
**Mark the post that answers your question by clicking on "Mark as Best Answer"
