Per diem is a fixed daily allowance that employers pay employees to cover lodging, meals, and incidental expenses during business travel. In FY2026, the standard GSA per diem rate for the continental United States (CONUS) is $178 per day — $110 for lodging and $68 for meals and incidental expenses (M&IE). Per diem simplifies expense reporting, controls travel costs, and provides tax advantages under IRS accountable plan rules.
What Is Per Diem? Definition and Purpose
Per diem — Latin for "per day" — is a daily allowance paid to employees who travel for business. Rather than requiring travelers to submit individual receipts for every hotel night, restaurant meal, and taxi ride, per diem provides a predetermined flat rate that covers standard travel expenses. This system benefits both employers and employees: companies gain predictable budgeting and reduced administrative overhead, while travelers enjoy spending flexibility without the burden of tracking every transaction.
Per diem allowances typically cover three categories of business travel expenses:
- Lodging — hotel or other accommodation costs incurred overnight at the travel destination
- Meals — breakfast, lunch, and dinner expenses while away from the employee's tax home
- Incidental expenses (IE) — tips to porters, baggage carriers, hotel staff, and fees or tips for service providers such as food servers and luggage handlers
For corporate travel programs, per diem serves as a cornerstone of business expense management. It eliminates the time-consuming receipt-chasing process, reduces disputes over what constitutes a "reasonable" expense, and creates clear expectations for travelers before they even book their trip. Organizations that handle hundreds or thousands of trips per year find that per diem policies dramatically reduce the accounting workload associated with expense reconciliation.
Per diem is a fixed daily allowance that employers provide to employees to cover lodging, meals, and incidental expenses during business travel. The U.S. General Services Administration (GSA) sets standard CONUS per diem rates annually, with the FY2026 standard rate at $178 per day — comprising $110 for lodging and $68 for meals and incidental expenses. Approximately 300 Non-Standard Areas (NSAs) receive higher rates to reflect above-average costs of living. When paid under an IRS-compliant accountable plan, per diem reimbursements are non-taxable to the employee, making them a tax-efficient way to compensate business travelers. The system eliminates the need for itemized receipt submission and gives employees flexibility in how they allocate their daily allowance.
How Per Diem Rates Are Set
GSA CONUS Rates
The U.S. General Services Administration (GSA) establishes per diem rates for the continental United States (CONUS) each fiscal year. These rates apply to federal employees and serve as the benchmark most private-sector companies adopt for their own travel policies. GSA uses lodging cost data from a contractor survey of hotel rates across different localities, adjusting rates to reflect actual market conditions.
Each CONUS location is assigned one of two rate types:
- Standard rate — the default rate that applies to any area not designated as a Non-Standard Area (NSA). For FY2026, the standard rate is $110 for lodging and $68 for M&IE.
- Non-Standard Area (NSA) rate — approximately 300 locations with above-average travel costs receive higher per diem rates. Major cities like New York, San Francisco, Washington D.C., and Boston typically carry NSA designations with significantly higher lodging allowances.
The GSA reviews and updates rates annually, with new rates taking effect on October 1 — the start of the federal fiscal year. Private employers are not required to use GSA rates but frequently adopt them because they provide a defensible, IRS-recognized benchmark.
OCONUS and International Rates
For travel outside the continental United States, two agencies set per diem rates:
- U.S. Department of State — sets per diem rates for foreign locations (OCONUS international), updated monthly to reflect currency fluctuations and local cost changes
- Department of Defense (DoD) — sets rates for non-foreign OCONUS locations including Alaska, Hawaii, Guam, and other U.S. territories
International per diem rates can vary dramatically. A business traveler to Tokyo or Zurich may receive more than double the standard CONUS rate, while destinations in Southeast Asia or Eastern Europe may fall below it. Companies managing global corporate travel programs must track rates across multiple sources and update them frequently to remain compliant.
FY2026 Per Diem Rates: What You Need to Know
The FY2026 per diem rates took effect on October 1, 2025, and remain in effect through September 30, 2026. Notably, GSA kept rates unchanged from FY2025, reflecting a stabilization in hospitality costs after several years of post-pandemic increases.
Standard CONUS Rate Breakdown
- Lodging: $110 per night
- Meals & Incidental Expenses (M&IE): $68 per day
- Total standard per diem: $178 per day
M&IE Allocation by Meal
The $68 standard M&IE rate is allocated across meals and incidentals using fixed percentages established by GSA:
- Breakfast: 15% ($10.20)
- Lunch: 25% ($17.00)
- Dinner: 40% ($27.20)
- Incidentals: remaining portion ($13.60)
These percentages matter when employers need to deduct meals provided by a conference, client, or hotel (the "provided meals" deduction). If a conference registration includes lunch, the employer reduces that day's M&IE by 25% of the applicable rate.
IRS High-Low Substantiation Method
As an alternative to tracking individual GSA rates for every city, the IRS offers the high-low substantiation method. Published in IRS Notice 2025-54, the FY2026 high-low rates are:
- High-cost localities: $225 per day ($151 lodging + $74 M&IE)
- All other localities: $178 per day ($104 lodging + $74 M&IE)
The high-low method simplifies administration for companies operating across many locations. Instead of looking up GSA rates for each specific destination, the finance team only needs to determine whether a city is on the IRS high-cost list. This approach is especially popular among mid-size companies that lack dedicated travel management resources.
For FY2026 (October 1, 2025 – September 30, 2026), the GSA standard CONUS per diem rate is $178 per day, comprising $110 for lodging and $68 for meals and incidental expenses. These rates are unchanged from FY2025. Approximately 300 Non-Standard Areas receive higher rates reflecting elevated local travel costs. The IRS high-low substantiation method, published in IRS Notice 2025-54, offers a simplified two-tier alternative: $225 per day for designated high-cost localities ($151 lodging + $74 M&IE) and $178 per day for all other areas. The M&IE portion breaks down by meal: 15% for breakfast, 25% for lunch, 40% for dinner, with the remainder covering incidentals such as tips and service fees. International per diem rates are set separately by the U.S. Department of State and updated monthly.
Per Diem Calculation Methods
Organizations typically use one of three approaches to calculate per diem for business travelers. Each method offers different tradeoffs between simplicity and precision.
1. Full GSA Rate Method
The company looks up the exact GSA rate for the traveler's destination and reimburses that amount. This method provides the most accurate per diem but requires maintaining a current database of rates across all CONUS locations and updating it annually.
2. IRS High-Low Method
Instead of destination-specific rates, the company classifies each trip as "high-cost" or "other" using the IRS list. The traveler receives $225 or $178 per day accordingly. This method is significantly easier to administer. However, an employer must use the same method for all employees within a calendar year — switching between high-low and GSA rates mid-year is not permitted.
3. Flat Company Rate
Some organizations set their own flat per diem rate, independent of GSA tables. This approach offers maximum simplicity but may result in over- or under-payment depending on the destination. Companies using a custom rate still need to ensure it falls within IRS guidelines to maintain the tax benefits of an accountable plan.
First and Last Day Rules
On the first and last day of business travel, the IRS allows only 75% of the applicable M&IE rate. For the standard CONUS rate, this means $51.00 instead of $68.00 on travel days. The lodging rate applies in full for any night the traveler requires overnight accommodation.
Provided Meals Deduction
When meals are provided at no cost to the traveler — for example, a hotel breakfast included in the room rate or lunch provided at a conference — the employer must reduce the M&IE allowance by the appropriate meal percentage. Failing to make this adjustment can create tax compliance issues.
Tax Rules for Per Diem Payments
Per diem tax treatment depends entirely on whether the employer maintains an IRS-compliant accountable plan. Understanding this distinction is critical for finance teams and HR managers who administer business travel tax policies.
Accountable Plan Requirements
An accountable plan must satisfy three conditions:
- Business connection — the expense must have a clear business purpose (attending a client meeting, conference, training session, or similar work-related activity)
- Adequate accounting — the employee must submit an expense report with dates, destinations, and business purpose within 60 days of the expense
- Return of excess — any per diem amount exceeding actual expenses (or the applicable federal rate) must be returned to the employer within 120 days
When all three conditions are met, per diem payments are non-taxable to the employee — they are excluded from gross income and exempt from payroll taxes. The employer may deduct the per diem as a business expense, subject to the 50% limitation on the meal portion.
Non-Accountable Plan Consequences
If the employer's plan fails any of the three accountable plan requirements, the entire per diem payment is treated as taxable wages. This means:
- The full amount is included in the employee's W-2 gross income
- Federal income tax, Social Security, and Medicare taxes apply
- The employer owes its share of payroll taxes on the per diem amounts
This creates a significant cost increase for both parties, which is why maintaining accountable plan compliance should be a top priority for any corporate travel program.
Employer Deduction Rules
Even under an accountable plan, the 50% meal deduction limit applies to the M&IE portion of per diem. For example, if an employer pays the standard $68 M&IE rate, only $34 is deductible as a business expense. The lodging portion remains 100% deductible. This limitation makes it important for employers to separately track the lodging and meals components of per diem payments for tax reporting purposes.
Per diem payments are non-taxable to employees when paid under an IRS-compliant accountable plan, which requires three conditions: a clear business connection for the travel, adequate accounting submitted within 60 days of the expense, and return of any excess amounts within 120 days. When these conditions are met, per diem reimbursements are excluded from the employee's gross income and exempt from federal payroll taxes. Employers may deduct per diem as a business expense, though the meals and incidental expenses portion is subject to a 50% deduction limitation. If the plan fails any accountable plan requirement, the entire per diem amount becomes taxable wages subject to income tax and FICA withholding — substantially increasing costs for both employer and employee. Companies should ensure their travel policies explicitly document accountable plan procedures to preserve the tax-free treatment.
Per Diem Policy Best Practices
A well-designed per diem policy balances cost control with traveler satisfaction. Here are proven practices that leading corporate travel programs employ:
Document Everything in Writing
Your per diem policy should be a standalone document — not a paragraph buried in an employee handbook. It should clearly state which rate method the company uses (GSA, high-low, or custom), how to handle first/last travel days, the procedure for provided meals, and the deadline for expense report submission.
Choose the Right Rate Method for Your Organization
- Companies with concentrated travel (same few cities) — full GSA rates are manageable and most accurate
- Companies with dispersed travel (many different destinations) — the IRS high-low method reduces administrative complexity
- Companies with mostly international travel — consider using State Department OCONUS rates as the baseline
Set Clear Exceptions for High-Cost Cities
If your standard per diem is the CONUS default of $178, employees traveling to Manhattan ($379 per diem for FY2026) or San Francisco ($367) will be severely undercompensated. Build a pre-approved exception list for high-cost locations, or adopt NSA-specific rates for your most common travel destinations.
Establish Approval Workflows
Require manager approval for trips exceeding a set number of days or total cost threshold. This prevents runaway per diem expenses on extended assignments while giving travelers autonomy on routine short trips.
Review Annually
GSA rates update every October 1. Your per diem policy should be reviewed at least annually to ensure it reflects current federal rates and remains competitive enough to attract and retain talent who travel frequently.
How Travel Management Companies Automate Per Diem
Manual per diem management — looking up rates, calculating partial days, adjusting for provided meals, tracking compliance deadlines — does not scale. This is where travel management technology becomes essential.
Modern travel management platforms like Travel Code automate the per diem workflow end-to-end:
- Automatic rate lookup — the system pulls the correct GSA, State Department, or DoD rate based on the traveler's destination and travel dates
- Partial day calculation — first and last travel days are automatically calculated at 75% of the M&IE rate
- Provided meals adjustment — when meals are flagged as provided (conference meals, client dinners), the system automatically reduces the daily allowance
- Policy enforcement — the platform checks per diem claims against company policy in real time, flagging exceptions before they become compliance issues
- Tax reporting integration — per diem data feeds directly into payroll and accounting systems with the correct tax treatment already applied
For companies processing more than a few dozen trips per month, automation eliminates the risk of rate lookup errors, missed compliance deadlines, and inconsistent policy application across departments. The time savings alone — often 15 to 30 minutes per trip in manual lookup and calculation — compounds rapidly at scale.
Per Diem vs. Actual Expense Reimbursement
Companies choose between two fundamental approaches to covering employee travel costs. Each has distinct advantages depending on the organization's size, travel volume, and administrative capacity.
Per Diem Advantages
- Predictable budgeting — costs are known before the trip occurs
- Reduced administration — no individual receipt review or approval required for routine expenses
- Faster reimbursement — employees receive a set amount without waiting for receipt processing
- Traveler flexibility — employees can choose how to allocate their daily allowance
- IRS safe harbor — using federal rates provides built-in substantiation
Actual Expense Advantages
- Cost precision — reimbursement matches actual spending, potentially saving money in low-cost locations
- Higher reimbursement ceiling — travelers in expensive cities are not capped at a flat rate
- Detailed spending data — receipt-level data enables deeper spend analytics
Which Approach Is Right?
Many companies adopt a hybrid model: per diem for M&IE (since meal costs are relatively consistent and receipt tracking is tedious) and actual expense reimbursement for lodging (since hotel costs vary widely and are documented by a single receipt). This hybrid approach captures the administrative simplicity of per diem for high-frequency small expenses while maintaining cost control on the largest variable expense — accommodation.
For organizations evaluating their approach, the key factors are travel volume, destination diversity, and administrative capacity. Companies with high travel volume and diverse destinations benefit most from per diem's scalability, while smaller organizations with concentrated travel may find actual expense reimbursement more cost-effective.
Conclusion
Per diem is far more than a daily allowance — it is a strategic tool for controlling business travel costs, simplifying expense management, and maintaining tax compliance. With the FY2026 standard CONUS rate holding steady at $178 per day and the IRS high-low method offering a streamlined alternative at $225/$178, organizations have clear benchmarks for building effective per diem policies.
The key to a successful per diem program lies in three elements: choosing the right rate method for your travel patterns, maintaining accountable plan compliance for tax-free treatment, and leveraging technology to automate rate lookups, calculations, and policy enforcement. Whether you manage a handful of business trips per quarter or thousands per month, a well-structured per diem policy reduces friction for travelers and finance teams alike — turning what could be an administrative headache into a competitive advantage for your corporate travel management program.
