Sorry, but changing the miles does not correct the problems with Form 4797 Gain calculation. The problem is that the date that I discontinued using the vehicle in 2021 is what is causing the errors on Form 4797. Specifically, on the Car and Truck Expenses Worksheet for this vehicle, the date that I discontinued using this vehicle in my business, April 1, 2021 (line 43 of the worksheet), is used by TurboTax to calculate the percent business use of the vehicle (line 9 of the worksheet). Even though I bought this vehicle new and started using it in 2008, and the vehicle has been fully depreciated for years (no depreciation recapture), TurboTax calculates that the percent business use of the vehicle over it's entire life is 30% (because of the April 1, 2021 date that I discontinued using it for the business) and enters 30% of the original purchase price on line 21 of Form 4797 - the cost or basis of the vehicle for calculating the gain on sale. The percent business use field on the worksheet is not changeable except by manipulating the date that I stopped using the vehicle in the business. Note also that the date that I discontinued using the vehicle is entered on Form 4797 also (Part III, line 19a, column C).
The percent business use on the Car ad Truck Expenses Worksheet is being calculated (incorrectly in my case) and should be an open field so that I can enter the correct percent business use over the entire life of the asset.
(The incorrect percent business use calculation also causes problems with entering actual expenses for the vehicle. In my case, only 30% of the vehicle's actual 2021 expenses are treated as deductible expenses. All of the expenses that I incurred to April 1, 2021 should be deductible.)
