Do I pay sales tax when I sell my car privately?

As a private seller you generally don't collect or pay sales tax on the sale; in most states the buyer pays any tax or title fees when they register the car. However, rules vary by state, and some states have specific forms or fees for private transfers. If you sell for more than you paid, which is uncommon, there could be income tax implications. Check your state DMV and revenue department, and talk to a tax professional if you have questions about your situation.