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How to treat miles driven to the mechanic, gas station, etc when calculating business use of car?
I contacted Stephen Fishman, J.D., the author of Home Business Tax Deductions, to let him know that this question was missing from his book. He was kind enough to send a reply. My original phrasing of the question: If your car is used for both business and personal use, and you deduct via the actual expense method, do trips to the mechanic, gas station, and auto parts store to service or repair the car count as business miles, personal miles, or part-business-part-personal miles? What about driving the newly-purchased car home from the dealership? And his response: Good question. I can find nothing about this in IRS publication or elsewhere. However, common sense would tell us that the cost of driving to make car repairs should be deductible. If you use your car for business, it is a business expense, just like transporting any other piece of business equipment for repairs is a business expense. This should be so whether you use the standard mileage rate or actual expense method. You should probably reduce the amount of your deduction by the percentage of personal use of the car during the year. The same goes for driving a car home from the dealer.