There is no cost to inquire. To apply for a tax refund, the taxpayer or representative must complete Sections 1 through 5 of this application.In order for an overpayment refund to be processed in a timely manner, please submit a completed form with all refund checks and supporting documentation. Form TR210 is a letter you receive if: If you received it, you may be entitled to a refund for the tax year stated on the letter.