I'm sorry, you mean $14k Original cost basis, since this is what I had for 2017, and given limited documents and now working with unfortunately 75 yr old dementia T/P.  As you can see, adjusted the Orignal Basis by the Busn. % based on 2018 Mileage to $9,208.  This vehicle was a 1988 Bronco and believed it was placed in service when purchased in 2012 or earlier and they were just taking std mileage.....As for the decline in FMV in 2018.....I would say, as a result of taking the vehicle to the shop in 2107, and not having it returned in a workable condition......it probably was trashed and just parted out the engine and other usable parts in 2018...considering its age.