Why is there a Difference Between Kelley Blue Book and NADA Trade In Value?
The main difference between Kelley Blue Book and NADA trade in value is the data they are using. Kelley Blue Book gathers its information to determine pricing by attending car auctions throughout the country. The NADA, which is the National Automobile Dealers Association, uses actual retail sales data provided by its member car dealers. There can be large differences in the valuations of some vehicles. The industry consensus is that the more accurate data tends to come from the NADA guides. Car dealers also rely on The Black Book, which is an industry only guide not available to the public.
For more info, see Figuring Out Your Used Car Trade In Value