The Internal Revenue Service has issued updated per diem rates that take effect Oct. 1, 2021, which taxpayers can use to substantiate the amount of expenses for lodging, meals, and incidental expenses when traveling away from home. This optional “high-low… The Internal Revenue Service has issued updated per diem rates that take effect Oct. 1, 2021, which taxpayers can use to substantiate the amount of expenses for lodging, meals,… https://customer.aatrix.com/news/2021/10/irs-issues-federal-high-low-diem-rates-effective-october-1/