Did you report this vehicle under your business in prior years? If so, you should have a Car & Truck Worksheet in your TurboTax return that will have the depreciation information under Part VI.
Note that each activity on your return (Schedule C or Schedule E) will have its own Depreciation and Amortization Report.
If you need to print the forms and worksheet in your prior year return, see How do I get a PDF of my return?
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