The optional standard mileage rates for business use of a vehicle will increase significantly in 2019, after increasing slightly last year, the IRS announced Friday (Notice 2019-2). For business use of a car, van, pickup truck, or panel truck, the rate for 2019 will be 58 cents per mile up from 54.5 cents per mile in 2018. Taxpayers can use the optional standard mileage rates to calculate the deductible costs of operating an automobile.