IRS Updates Per Diem Rates for Fiscal Year 2027: What Businesses and Employees Need to Know

In a move aimed at aligning tax-deductible travel allowances with current economic conditions, the Internal Revenue Service (IRS) has released Notice 2026-60. This official guidance outlines the updated special per diem rates for taxpayers utilizing the per diem substantiation method for business-related travel. Effective October 1, 2026, these adjustments reflect the shifting costs of lodging, meals, and incidental expenses across the continental United States (CONUS), providing a simplified framework for employers and employees to track travel costs without the administrative burden of documenting every individual receipt.

Main Facts: The Shift in Substantiation Standards

The per diem substantiation method serves as a critical tool for businesses seeking to simplify the reimbursement process. Rather than requiring employees to submit granular documentation—such as individual receipts for every cup of coffee, hotel stay, or lunch—the IRS allows taxpayers to use predetermined daily rates. Under the rules established in Rev. Proc. 2019-48, if an employer provides a per diem allowance that does not exceed these federal rates, the amount is deemed substantiated.

Notice 2026-60 confirms that these rates are increasing for the upcoming fiscal year. These changes are designed to account for inflationary pressures and the rising cost of hospitality services in major metropolitan hubs and secondary markets alike. For businesses operating on a fiscal year that aligns with the federal government’s October 1 start date, these new figures provide the necessary ceiling for tax-advantaged reimbursements.

Chronology: The Lifecycle of IRS Per Diem Adjustments

The process of updating per diem rates is a structured annual cycle that ensures tax policy remains tethered to the real-world economy. Understanding this timeline is essential for corporate finance departments and tax professionals.

The Federal Fiscal Calendar

The IRS operates on a cycle that begins on October 1 of each year, coinciding with the start of the federal government’s fiscal year. This allows for a consistent application of rates across federal agencies and private sector entities that choose to adopt the federal standard.

• Pre-October Preparations: Throughout the late spring and summer, the General Services Administration (GSA) assesses regional lodging and meal costs across the U.S. This data forms the backbone of the IRS’s own determinations.
• Late Summer Publication: The IRS typically issues its formal notice (in this instance, Notice 2026-60) in the weeks leading up to October to give payroll departments sufficient time to update their accounting software.
• Effective Date (October 1): The new rates go into effect, governing all business travel occurring from October 1, 2026, through September 30, 2027.
• Annual Review: The cycle repeats the following year, with the IRS evaluating whether economic fluctuations necessitate further increases or, in rare cases, adjustments to the "high-cost" locality designations.

Supporting Data: High-Low and Transportation Rates

The IRS provides two primary avenues for taxpayers to substantiate their expenses: the High-Low substantiation method and the industry-specific transportation rates.

The High-Low Substantiation Method

For organizations that prefer a simplified regional approach, the High-Low method categorizes locations into two tiers: "High-Cost" and "Non-High-Cost."

• High-Cost Localities: The federal per diem rate for these areas is now $329, up from $319.
• Non-High-Cost Localities: The rate for all other areas has been adjusted to $230, up from $225.

Crucially, the portion of these rates allocated to meals for the purposes of Section 274(n)—which limits the deduction of meal expenses—remains fixed at $86 for high-cost localities and $74 for all other localities. The IRS defines a "high-cost" locality as any area with a federal per diem rate of $280 or more. The updated list of these locations is provided within the text of Notice 2026-60 and must be cross-referenced by finance teams to ensure compliance.

Transportation Industry Standards

The transportation industry faces unique challenges, as employees in this sector (such as long-haul truckers or flight crews) often travel across multiple jurisdictions in a single day. To accommodate this, the IRS provides specialized rates that decouple from the location-based CONUS list.

• Meals and Incidental Expenses (M&IE): These rates remain steady at $80 for travel within CONUS and $86 for travel outside CONUS.
• Incidental Expenses: The flat rate remains fixed at $5 per day, regardless of location.

These rates are designed to offer stability for industries where travel is not merely an occasional business expense but a fundamental requirement of daily operations.

Official Responses and Regulatory Context

The issuance of Notice 2026-60 is an exercise in administrative efficiency. By maintaining the regulatory framework established in Rev. Proc. 2019-48, the IRS ensures that taxpayers are not forced to learn a new system every twelve months. Instead, the focus remains on updating the numerical values to reflect current market realities.

Tax professionals emphasize that while the per diem method is convenient, it is not a "blank check." The "deemed substantiated" status only applies if the taxpayer adheres strictly to the documentation requirements regarding time, place, and business purpose. If an employer pays a per diem that exceeds the federal rate, the excess amount must be treated as taxable income and reported on the employee’s Form W-2. Conversely, if an employer pays less than the federal rate, the employee may be able to deduct the difference, though recent changes to the tax code (under the Tax Cuts and Jobs Act) have limited the ability of employees to claim unreimbursed business expenses in many instances.

Implications for Businesses and Taxpayers

The adjustments for fiscal year 2027 carry significant implications for corporate policy, budgeting, and tax planning.

1. Corporate Policy Revisions

Companies that utilize per diem reimbursements must update their internal travel policies to reflect the new $329 and $230 caps. Failure to update internal software can result in two outcomes:

• Under-reimbursement: Employees may feel penalized for business travel if the internal rate lags behind the new federal maximums.
• Tax Compliance Issues: Over-reimbursing employees above the new federal limits without proper tax withholding can trigger payroll tax audits and potential penalties.

2. Budgetary Forecasting

For finance departments, the $10 increase for high-cost travel and $5 increase for standard travel represents a tangible rise in the "cost of doing business." When projecting travel budgets for the upcoming year, companies should apply these new rates to their estimated travel volume to ensure that cash flow forecasts are accurate.

3. The "High-Cost" List Watch

The IRS updates its list of high-cost localities annually. A city that was classified as "high-cost" in 2026 might be reclassified in 2027 if its local lodging costs have stabilized relative to the rest of the country. Travel managers must audit their frequent destinations against the latest list provided in the Notice to ensure they are applying the correct tier.

4. Record-Keeping Discipline

Even with the per diem method, the burden of proof rests on the taxpayer. The IRS mandates that taxpayers must still provide:

• Evidence of the business purpose of the trip.
• Documentation of the date and location of the travel.
• A breakdown of the allowance provided to the employee.

Without this "substantiation," the IRS reserves the right to disallow the deduction entirely, treating the payments as taxable compensation.

Conclusion

As the business landscape continues to evolve, the IRS’s commitment to providing clear, data-driven per diem rates remains a vital component of the U.S. tax system. Notice 2026-60 provides a predictable path forward for the 2027 fiscal year, balancing the needs of the government to ensure tax compliance with the needs of businesses to minimize administrative overhead.

For employers and tax practitioners, the message is clear: review your internal policies, update your payroll systems before October 1, and ensure your team is aware of the specific "high-cost" locality designations that apply to their upcoming travel itineraries. By maintaining alignment with these federal standards, organizations can mitigate the risks associated with travel expenses while ensuring their employees are fairly and efficiently compensated for the costs of conducting business on the road.

For further clarification on these updates or specific questions regarding the application of these rates to unique business scenarios, taxpayers are encouraged to consult the full text of Notice 2026-60 or reach out to a qualified tax advisor. As always, the AICPA and other industry bodies remain resources for those seeking to navigate the complexities of travel expense substantiation.