How do I claim vehicle if i want to write it off entirely self employed

[JulieCo]

Enter the vehicle in the Vehicle Expense section of your Schedule C business expense entry.  You will be asked several questions related to the vehicle, but soon will come to screen where you can choose to record actual expenses (rather than the standard mileage deduction).  From there you will eventually be asked about depreciation and whether you want to take a full deduction for the vehicle purchased this year.

See steps below to be brought to self-employed business expense entry section of TurboTax:

https://ttlc.intuit.com/replies/5802554