How do I deduct can i use gas as a tax write off on my taxes?

Gas expenses can be deducted if they are incurred for business purposes. This applies to self-employed individuals, small business owners, and employees who use their vehicle for work-related activities (and are not reimbursed by their employer). Personal commuting expenses are not deductible. For business use, you can either deduct the actual expenses (including gas) or use the standard mileage rate set by the IRS.