Jody purchases a new car from a dealer for $31,000, she puts $2,500 down. The dealer agrees to give her $12,500 for trading in her current vehicle. The registration and title fee is $375. In Judy's state, the sales tax rate on new cars is 6.25% and trade in's reduce tax liability. How much will Jody pay in sales tax? Jody purchases a new car from a dealer for $31,000, she puts $2,500 down. The dealer agrees to give her $12,500 for trading in her current vehicle. The registration and title fee is $375. In Judy's state, the sales tax rate on new cars is 6.25% and trade in's reduce tax liability. How much will Jody pay in sales tax