01.12.23 by Public Relations & Marketing 2023 mileage rates The new 2023 mileage rates have been updated on the Employee Portal along with a new 2023 Mileage Form. Then new IRS reimbursement rate for 2023 is 65.5 cents per mile. The LLCC Vehicle Mileage Rate for 2023 remains at 22.0 cents per mile.