I am deducting my mileage expenses for the year but after entering all the information it did not lower the amount of tax I owe. Why is this?
Sorry, if you are a W2 employee job expenses are no longer deductible. See Deductions that have been suspended for 2018 - 2025.
https://ttlc.intuit.com/community/tax-reform/help/which-federal-tax-deductions-have-been-suspended-by-tax-reform/00/25565
It might still help you for State, though.