I have a vehicle used 4 years partially for business & was traded in on a new vehicle to use partially for business. The business usage varied per year. Even though I check the box the % are different over the years Turbo Tax is calculating the cost or other basis as the gain/loss basis times the current year business % which is a lot smaller than the average over the 4year term. How can you override what Turbo Tax is calculating for the cost or other basis?
