How do you calculate mileage for self employed?
How do you calculate mileage for self employed? To figure out your business use, divide your business miles by the total number of miles driven. In our example, you've used your car for business 33% of the time: 100/300 = 0.33.
Can you write off mileage and gas?
If you use your car exclusively in your business, you can typically deduct all of the car expenses, said IRS representative Sara Eguren. If you use your car for both business and personal purposes, you'll need to divide your expenses based on your mileage for business and your mileage for personal use.