Analysis of IRS Notice 2025-54 and the High-Low Substantiation Method
The Internal Revenue Service (IRS) recently issued Notice 2025-54, providing the 2025-2026 special per diem rates for substantiating business travel expenses. This notice, effective October 1, 2025, works in conjunction with the rules established in Rev. Proc. 2019-48 and is essential for tax professionals advising clients on accountable plan reimbursements and travel deductions. This article will analyze the new rates, their interaction with procedural rules, and the methodology the IRS uses to establish the high-low rates.
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