Remember, the IRS understands it costs money to run a business. They are not interested in taxing your earnings, just your profits. In addition to mileage, any costs incurred to operate your business such as cell phone and data use, supplies like hot bags or blankets, parking and tolls, rideshare commission fees, cleaning, water, gum or mints, accounting services, car washes, and more could be considered tax deductible. We recommend consulting with a tax professional if you are unsure about a certain expense.