Before the seller is eligible for a sales and use tax refund, the seller must refund the taxes collected back to the customer. See KRS 139.770. Then, sellers must file a Sales and Use Tax Refund Application, Form 51A209, with the Sales and Use Tax Division to document and submit the request for repayment of the tax remitted with previously filed returns. Instructions on how to submit the refund request are provided on the form as follows: 51A209 (ky.gov).