@mpalmer48
If you’re going to use the Standard Mileage deduction, you can’t deduct individual expenses for your car, such as engine replacement. That’s simply an IRS rule.
If you use the actual expense method, you can claim this expense, including labor.
If you want to use the standard mileage rate method, you must do so in the first year you use your car for business. In later years you can choose to switch back and forth between the methods from year to year without penalty.
Please see the TurboTax Help article “Standard Mileage vs. Actual Expenses: Getting the Biggest Tax Deduction” and the IRS's Publication 535, Business Expenses for more information.
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