If you use a vehicle for certain driving purposes, you can deduct your costs based on your actual expenses or rely on an IRS-set mileage rate. The IRS has announced the standard mileage rates that can be used for deductible-driving costs in 2020 (Notice 2020-5). These rates apply for the use of a car, van, pickup, or panel truck:
If you use the standard mileage rate to figure your deduction for business use of a vehicle, you must reduce the basis of the vehicle by a cents-per-mile rate. For 2020, the rate is 27 cents per mile (up one cent from the 2019 rate).
A rate for a period of less than a year computed as though for a full year.