Irs Per Diem Rates 2024 Mileage. Beginning on january 1, 2024, the standard mileage rates for the use of a car (also vans, pickups or panel trucks) are:  — the irs has released its annual update of special per diem rates for taxpayers to use in substantiating business expenses while traveling away from home.

 — per diem rates for meals and lodging are based on geographical location.  — the irs has announced the standard mileage rate for 2024: