How do I figure out a fair market value for a Vehicles Total Cost? The car had started being used partially for business use the previous tax year.

[Leonard · Accepted solution]

You can use any of the car valuation resources that are available to figure the fair market value FMV  such as; Edmunds, NADA, Kelley Blue Book.  You will want to figure the FMV of the car at the time you started using it for business purposes.  For example, if you started using the vehicles in 2018 you will want to use reference information that was published in 2018.

[Edited 03/11/2020 | 10:46 am PDT]