If you are at a dealership, you'll sign the contract in the finance and insurance office. There, you will likely be offered additional items, such as a warranty, anti-theft devices, prepaid service plans or fabric protection.
Some people want the peace of mind that comes with extended warranties, so this is something you might want to consider (unless the car is still under the manufacturer's warranty or is a CPO vehicle). Review the dealership sales contract thoroughly. In most states, it lists the cost of the vehicle, a documentation fee, possibly a small charge for a smog certificate, sales tax and license fees.
If you are buying a car from an individual owner, make sure the seller properly transfers the title and registration to you. It's important to close the deal correctly to avoid after-sale hassles. Before money changes hands, ask for the title (which is sometimes called the pink slip) and have the seller sign it over to you. Rules governing vehicle registration and licensing vary from state to state. If possible, check with your local department of motor vehicles to make sure there are no past-due registration fees you'd be responsible for should you buy the car. Whether you buy from a dealer or a private party, make sure you have insurance for the car before you drive it away.
Once you've done the paperwork, it's time to celebrate your new purchase – maybe with a drive-through dinner. You deserve it!