A designated vehicle for a business may qualify as a deduction for its entire cost of ownership and operation (subject to limits discussed later). However, if the vehicle is used for business and personal purposes, its use can only be deducted for business purposes.
The deductible amount can generally be figured by using one of two methods: the standard mileage rate method or the actual expense method. The vehicle may qualify to use both methods, to decide which method gives a larger deduction.
To add mileage/vehicle expenses on Schedule C
1) Enter the return, select Add Form +
2) Search Schedule C Profit or Loss from Business in the sidebar search engine
3) Select Add New
4) Scroll down to Expenses, on line 9, indicate Yes if there is a Car and/or Truck Expense on the Schedule C
5) Select +Add New on the Asset Basic Information Page, and complete the following pages
6) Complete the Automobile Listing page
This is where to indicate the mileage entries to expense.