If this is your chosen method for writing off car loan interest and every other car-related tax deduction, there are a few things you'll need to do, or the IRS won't allow you to take the deduction, and a few other things to be aware of.
Mileage log
You'll need to keep solid records of the miles you drive for work in the form of a
mileage log. You can do this the old-school way by keeping a notebook and pen in your car and recording the mileage for each trip, or you can use one of the many apps on the market that automatically tracks your mileage through your phone's GPS.
Trips not for work
Remember that trips that aren't for work, like from dropping off a rideshare client to the restaurant where you're grabbing lunch, are not tax-deductible. Or if you're doing a job as an independent contractor, the miles you drive from your home to a job site are not deductible as they are considered to be
"commuting miles".
Track expenses
There are still a handful of expenses that can be considered a car tax write-off, even if you take the Standard Mileage deduction. You'll need to track them because they're not included in the standard mileage rate. You can do this using spreadsheets and saving receipts, or you can use an app like FlyFin to let A.I. automatically track your expenses so you don't miss a single deduction. You can also write off
car depreciation as a deduction over a period of years or in the first year you put it into use.