It depends on what you're using it for.
If you're using it as a business expense, then you take the mileage on Schedule C. You claim that by going to Business Expenses>Business Vehicle Expenses on your Business tab.
If you're using it as a car to check on rental properties, you take it as a deduction on Schedule E. Go to Rental Properties and Royalties>Vehicle Expenses on your Business tab.
If you're taking off sales tax paid on a new car, you take it as a deduction on Schedule A. Go to Deductions & Credits>Estimates and Other Taxes Paid>Sales Tax.
If you're taking off the registration fee, you take it as a deduction on Schedule A. Go to Deductions & Credits>Cars and Other Things you Own>Car Registration Fees. Depending on the state in which you live, you may or may not be able to deduct it.
It depends on what you're using it for.
If you're using it as a business expense, then you take the mileage on Schedule C. You claim that by going to Business Expenses>Business Vehicle Expenses on your Business tab.
If you're using it as a car to check on rental properties, you take it as a deduction on Schedule E. Go to Rental Properties and Royalties>Vehicle Expenses on your Business tab.
If you're taking off sales tax paid on a new car, you take it as a deduction on Schedule A. Go to Deductions & Credits>Estimates and Other Taxes Paid>Sales Tax.
If you're taking off the registration fee, you take it as a deduction on Schedule A. Go to Deductions & Credits>Cars and Other Things you Own>Car Registration Fees. Depending on the state in which you live, you may or may not be able to deduct it.