Where do i input a vehicle purchase?

For personal use or business?

The purchase of a vehicle for personal use is not tax deductible.  If you are itemizing your return, then you can enter the sales tax paid in the deductions and credits section under estimates and other taxes paid.

If this is a business purchase, then you will enter it in the business section of TurboTax as a business vehicle expense.  Here you will be given the option to depreciate your vehicle or take the standard mileage deduction. 

Since this is the first year using the vehicle, if you do NOT choose the standard mileage this year, you will need to stick with actual expenses.  If you DO choose standard mileage, then you can switch back and forth in future years.