Jot down the VINs and prices of other cars you’ve looked at. It reminds the salesperson that you have options and are willing to walk away.

You cannot trade a car you don't legally own. If you have a co-signer on your old car, they may need to be present to sign.

If you are financing, lenders often require a utility bill (electric, water, or cable) or a property tax statement from the last 30–60 days to verify your address. 2. Proof of Income and Employment