According to IRS Publication 463, the standard mileage rate in 2023 for deductible car expenses is $0.655 per mile. I entered 997 miles into TurboTax 2023. Simple arithmetic shows an allowable deduction for the mileage alone of $723.12. In spite of this, TurboTax 2023 calculates my total deduction (which apparently includes the business portion of my vehicle's property tax) as $655. There seems to be an error in the software for this particular calculation, which seems as if it might be based on the 2022 standard mileage rate of $0.585 per mile?
