Once you are entering information for your Schedule C, you go to the Vehicle Expense section to report information about the vehicle you used for business purposes. As you fill in that section of information, your business miles and total miles for the year will be part of the inputs.
You should not do the calculation yourself and enter it as a business expense. TurboTax will ask you the relevant questions in order to be sure you are qualified to claim the mileage expense when you go through the Vehicle Expense section.
If you are using TurboTax Online, then you will be required to upgrade to a higher version in order to claim business expenses.
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