"This annual notice provides the 2021-2022 special per diem rates for taxpayers to use in substantiating the amount of ordinary and necessary business expenses incurred while traveling away from home, specifically [1] the special transportation industry meal and incidental expenses (M&IE) rates, [2] the rate for the incidental expenses only deduction, and [3] the rates and list of high-cost localities for purposes of the high-low substantiation method."