As the new fiscal year approaches, businesses and tax professionals must recalibrate their travel expense reimbursement policies to align with the latest federal guidelines. The Internal Revenue Service (IRS) has officially released Notice 2026-60, outlining updated special per diem rates for taxpayers utilizing the per diem substantiation method. These adjustments, which take effect on October 1, 2026, reflect the evolving costs of travel across the continental United States (CONUS) and provide a critical framework for tax-compliant business expense reporting.
Main Facts: Navigating the 2027 Per Diem Adjustments
The core purpose of the IRS per diem substantiation method, as governed by Revenue Procedure 2019-48, is to provide a simplified alternative to the administrative burden of tracking every receipt for actual lodging, meal, and incidental expenses. By utilizing these IRS-sanctioned rates, employers can reimburse employees without requiring them to substantiate every individual expenditure, provided the allowance does not exceed the federal limits.
Under the new guidance, the "high-low" substantiation method—a simplified approach for identifying high-cost versus standard-cost travel destinations—has seen a notable increase. For travel occurring on or after October 1, 2026, the high-cost locality rate has risen to $329 (up from $319), while the rate for all other CONUS localities has climbed to $230 (up from $225).
These figures represent a crucial threshold for corporate finance departments. When an employer pays a per diem allowance, the amount deemed substantiated for tax purposes is the lesser of the actual allowance provided or the federal rate for that specific location. Failure to align internal policies with these updated ceilings can lead to "excess" reimbursements, which may be reclassified as taxable income if not properly accounted for under an accountable plan.
Chronology of Regulatory Updates
The IRS maintains these rates on an annual cycle that aligns with the federal fiscal year, rather than the calendar year. This cycle ensures that government travel policies and private sector tax guidance remain synchronized.
- October 1, 2025: The implementation date of the previous fiscal year’s rates, which set the baseline for the last twelve months of travel reimbursement.
- Summer 2026: The IRS conducted its annual review of lodging and meal costs across the United States, utilizing data provided by the General Services Administration (GSA) and other economic indicators to determine where cost-of-living adjustments were necessary.
- August/September 2026: The formal publication of Notice 2026-60, providing taxpayers with the lead time necessary to update payroll software, travel policies, and corporate accounting systems before the October 1 transition.
- October 1, 2026: The official effective date for the new rates. All business travel conducted on or after this date must be evaluated against the new Notice 2026-60 guidelines to remain in full compliance with IRS substantiation requirements.
- September 30, 2027: The expiration date for the current rate schedule, at which point the IRS will issue updated guidance for the 2028 fiscal year.
Supporting Data: High-Low and Transportation Industry Breakdown
To understand the impact of these changes, it is essential to look at the specific tiers established by the IRS. The "High-Low" method is a widely adopted simplification tool that allows companies to bypass the need to research individual city-by-city per diem rates.
The High-Low Substantiation Method
The IRS defines "high-cost" localities as those with a federal per diem rate of $280 or more. The list of these localities is updated annually within Notice 2026-60 to reflect shifting real estate and hospitality markets.
For the 2027 fiscal year, the allocation for meals (relevant for Sec. 274(n) deduction limits) remains steady. For high-cost localities, the meal portion of the per diem is $86, while for all other CONUS localities, the meal portion is $74. It is imperative that tax departments distinguish between the total per diem (lodging + meals + incidentals) and the meal-only portion, as the latter is subject to the 50% deductibility limitation under current tax law.
Transportation Industry Exceptions
The transportation industry faces unique challenges, as employees in this sector often spend a disproportionate amount of time on the road or in transient lodging. Consequently, the IRS maintains specific provisions for these workers.
Under the new notice, the Meal & Incidental Expenses (M&IE) rates for the transportation industry remain static:
- CONUS travel: $80 per day.
- Outside-CONUS (OCONUS) travel: $86 per day.
- Incidental expenses: A flat $5 per day, regardless of the travel location (CONUS or OCONUS).
These rates provide a consistent, predictable framework for logistics, trucking, and shipping companies that move personnel across the country daily.
Official Responses and Compliance Strategy
The IRS’s mandate is clear: taxpayers utilizing the per diem substantiation method must strictly adhere to the rules set forth in Rev. Proc. 2019-48. This includes the requirement that the allowance must be paid to the employee for ordinary and necessary business expenses incurred during travel away from home.
Tax experts emphasize that the "accountable plan" rules remain the most critical safeguard for businesses. An accountable plan requires:
- Business Connection: The expenses must be related to the performance of services as an employee.
- Substantiation: The employee must provide the employer with information regarding the time, place, and business purpose of the travel (though the per diem method simplifies the substantiation of the amount).
- Return of Excess: Any portion of the allowance that exceeds the actual substantiated expenses—or that exceeds the federal per diem rate—must be returned to the employer within a reasonable period.
Failure to follow these steps risks having the entire reimbursement treated as wages subject to federal income tax withholding and employment taxes (FICA).
Implications for Corporate Policy and Employee Relations
The rise in per diem rates is a direct response to inflationary pressures in the hospitality sector. Hotel room rates and restaurant prices have seen volatility, and these IRS adjustments serve to ensure that employees are not personally penalized for business travel.
Financial Planning and Budgeting
For finance departments, the transition to the 2027 rates requires a "double-check" of internal policy manuals. If a company’s internal reimbursement policy is set to the "federal rate," that policy will automatically trigger higher payouts starting October 1. Companies that have static, hard-coded reimbursement amounts in their expense software must manually update these fields to match the new $329 and $230 caps. Failure to do so may result in employee dissatisfaction or, conversely, over-reimbursement that complicates tax filings.
The Impact on Small Business
Small business owners often rely on the high-low method precisely because it reduces the administrative burden of tracking receipts for every meal in every city. By keeping the high-low rates updated, the IRS facilitates compliance for smaller enterprises that lack the specialized tax departments found in large corporations.
However, small business owners should be cautious: the list of high-cost localities is not static. A city that was considered "high-cost" in 2026 might not be on the list for 2027, or vice versa. Reviewing the full appendix of Notice 2026-60 is a mandatory step for any business administrator before approving expense reports for the upcoming quarter.
Long-term Outlook
As the economy continues to fluctuate, the IRS per diem rates remain one of the most visible barometers of business travel costs. While these rates provide a safe harbor for tax purposes, companies are always free to reimburse employees for actual expenses if they choose, provided they have the receipts to prove them. The per diem method is merely a simplified tool, not a mandate.
Ultimately, the release of Notice 2026-60 serves as a timely reminder that the intersection of tax policy and corporate travel is dynamic. By staying informed of these changes, organizations can maintain their tax-exempt status regarding reimbursements, keep their accounting books clean, and ensure their traveling workforce is adequately supported in an increasingly expensive economic environment.
For further clarification or to review the full list of high-cost localities, taxpayers are encouraged to consult the official IRS Notice 2026-60 document or speak with a qualified tax professional. For questions regarding the implications of these changes on your specific industry, please contact your accounting advisor.
