Webyou can calculate mileage reimbursement in three simple steps: Select your tax year. Input the number of miles driven for business, charitable, medical, and/or moving purposes. Webfor 2024, the irs' standard mileage rates are $0. 67 per mile for business, $0. 21 per mile for medical or moving, and $0. 14 per mile for charity. If you drive for your. Websteps to claim the deduction: Keep accurate records to support your claim. You must either keep track of your vehicle expenses or keep a mileage log. Report income and expenses.