We will only issue a payoff good through the next Change Date. If the closing date is past the next Change Date an updated.To add or remove a lien on your vehicle title, visit your local county tax office. How to fill out the Payoff Request Letter Templates? Where do I mail my mortgage payment? An auto loan payoff letter is just a way to prove that you have paid in full for a car. If you are selling your vehicle, often the buyer will ask to. Any excess amount that you pay will be refunded. Harris County Tax Office Forms. Automotive Property Tax Special Permit Taxes VoterRegistration Miscellaneous.