What is a doc fee at a car dealership?

A doc fee, or documentation fee, is a dealer charge for preparing and processing the sale paperwork, such as title and registration filings. It's set by the dealer, not the government, and amounts vary a lot. Some states cap doc fees, while others don't. Ask about it upfront and include it when comparing out-the-door prices. OffLot's out-the-door estimate includes an illustrative fee amount so you're not surprised that fees exist.