Quick answer: a trade-in estimate begins with the VIN, mileage, equipment, history, condition and recent photographs. Final value is confirmed after inspection.
A documented evaluation
The information provided helps identify the vehicle correctly and prepare an initial analysis. Known damage, repairs, tires, keys, warning lights and other relevant details should be disclosed. An online estimate may change after physical inspection.
A simpler transition
When a trade-in is accepted, amounts, taxes, balances and other transaction elements are shown in the applicable documents. No estimate becomes final before written confirmation.