Sell us your car and the bid is $25,000, but your payoff is $5,000. We would cut you a check for $20,000, and you would sign a Bill of Sale and a Power of Attorney for us to pay off the title with your bank. Example 2. Sell us your car and the bid is $25,000, but your payoff is $30,000. What you'll need to sell your car. The best part about letting us help you sell your used car is that it's quick and easy. So let's get started and get you some cash. Here is everything you'll need to sell your car with our help: The REG number; Car details (like the colour, mileage and condition) A valid V5C/logbook; Service history; MOT Status.