Per Diem Rates 2024 Irs. Per diem rates for mileage are set by the irs;  — for fy 2024, the maximum lodging allowance rates in some existing per diem localities will increase, and the standard conus lodging rate will increase from.

 — the notice is effective for any per diem allowance paid for lodging, meal, and incidental expenses after october 1, 2024, the beginning of the u.s.  — for fy 2024, the maximum lodging allowance rates in some existing per diem localities will increase, and the standard conus lodging rate will increase from.