How many miles can you write off for taxes?
How many miles can you write off for taxes? If you have a dedicated vehicle that you only use for work purposes, you can write off 100% of your mileage on your tax return. If you have a personal vehicle that you sometimes use for your business, you can write off only the miles driven while you work.
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.