If you are buying a new vehicle and already have a good financing plan from your bank or credit union, you may want to see what the dealership is offering. They may be able to give you a better deal, but make sure to thoroughly read the contract. The finance manager may try to sell you some additional services that may be valuable, such as extended warranties and alarm systems, and "dealer extras," such as rustproofing. For warranties, know if your deal covers parts, labor or both, the duration of the warranty, and what percentage of the work is covered. Be sure to read all the contracts you sign.

When purchasing a used vehicle, write a bill of sale that includes the owner's name and address, your name and address, the make and model of the car, and purchase price. The Department of Motor Vehicles will need this information when you get vehicle tags. To make the sale official, have a notary public sign the bill of sale. If you are purchasing from a used car dealer, know the dealer's return policies.