How do I apply for an IRP refund? You can submit a request online through the Tennessee Taxpayer Access Point (TNTAP) or submit a refund request to the motor carrier section unit at email@example.com. July 19, 2018 21:13 Related articles Will the state issue a refund in the event of an overpayment? Can I receive a refund for the unused portion of my motor vehicle registration? How do I renew my IRP account? Are my federal government pension income and my IRA distributions subject to Tennessee’s Hall income tax? How do I apply for a refund of a tax credit on my account?