The standard rate for business mileage for 2019 is 58 cents per mile. That means that 5,000 miles would reduce your taxable income by $2,900. If you're in the 22% tax bracket, plus an effective self-employment tax rate of about 12.58%, that saves you over $1,000 in tax. Whether it's worth the time to keep track of it is your call.
If you are eligible for the Earned Income Credit (EIC), you must keep track of your mileage and claim all your business expenses.
