Per Diem: Rates, Rules and Smarter Business Travel Reimbursement

For employees and businesses that regularly deal with work related travel, per diem provides a structured way to handle common daily expenses without calculating every meal and travel related cost from scratch. In the United States, the term is closely associated with allowances for lodging, meals and incidental expenses when someone travels away from their normal work location for business. Federal rates provide an important benchmark, but the amount a worker actually receives depends on destination, travel dates, employer policy and applicable tax rules.

Understanding how these allowances work can help employees plan trips, employers simplify reimbursement policies and business owners maintain better records. It is also important to distinguish between federal reimbursement rates and the amount a private employer chooses to pay because they are not always identical.

This guide explains what the allowance covers, how federal rates are established, how first and last travel days are handled, what employers should consider and how tax treatment can change depending on the reimbursement arrangement.

What Does Per Diem Mean?

Per diem is a Latin phrase meaning by the day.

In a business travel context, it generally refers to a fixed daily allowance used to cover qualifying expenses while an employee is travelling away from home for work.

The Internal Revenue Service describes a per diem allowance as a fixed daily reimbursement that an employer provides for lodging and meals and incidental expenses while an employee is away from home on business.

Instead of reimbursing every qualifying cost purely according to its actual amount, an employer may use approved daily rates under an appropriate reimbursement arrangement.

The concept is commonly divided into two main expense categories.

• Lodging
• Meals and incidental expenses

These amounts are normally determined separately.

What Does the Daily Allowance Cover?

Lodging generally relates to temporary accommodation required for business travel.

Meals and incidental expenses, often shortened to M and IE, cover qualifying meal costs and defined incidental costs.

GSA explains that incidental expenses under federal travel rules include fees and tips given to people such as porters, baggage carriers and hotel staff. Taxes and gratuities connected with meals are already included within the federal M and IE rate rather than being reimbursed separately.

Airfare and other transportation costs are generally separate from the standard lodging and meal allowance.

This distinction is important when designing an expense policy because a company may reimburse flights, rental cars and taxis separately while using daily rates for meals and accommodation.

How Per Diem Rates Work in the United States

There is no single daily rate that applies to every destination in the country.

For official federal travel within the continental United States, the General Services Administration establishes rates based on location.

Some destinations use the standard federal rate.

Higher cost destinations can receive individual nonstandard rates.

GSA states that about 300 nonstandard areas have individual rates rather than the standard amount.

Rates can also vary during different months of the year because hotel costs may change seasonally in certain destinations.

Current Federal Per Diem Rates for 2026

For fiscal year 2026, which runs through September 30, 2026, GSA maintained the standard continental United States lodging rate at $110 per night.

The standard meals and incidental expenses rate is $68 per day.

Higher cost locations use M and IE tiers ranging from $68 to $92, while lodging allowances vary by destination.

These figures apply to federal travel standards within the continental United States and should not automatically be treated as the amount every private employer must pay.

Per Diem Rates Change on October 1, 2026

Travellers planning trips around the beginning of October should pay particular attention to the date.

Fiscal year 2027 rates take effect on October 1, 2026.

GSA has announced that the standard lodging rate will increase from $110 to $113, while the standard M and IE amount remains $68. The M and IE tiers continue to range from $68 to $92.

Because the correct allowance can depend on both location and travel date, employees and payroll teams should verify the applicable rate before processing reimbursement.

7 Smart Ways to Understand Per Diem for Business Travel

The system becomes much easier to use when it is broken into a few practical rules.

1. Check the Destination Before Calculating the Allowance

Location is one of the most important factors.

A business trip to a high cost metropolitan area may have a different lodging and meal allowance from travel to a location using the standard rate.

For example, FY 2026 GSA data shows a standard lodging rate of $110, while Seattle has monthly lodging rates that can reach $248 during higher rate periods. Seattle’s full M and IE rate is $92.

This illustrates why using one national figure for every trip may produce an inaccurate federal benchmark.

The traveller or employer should identify:

• Destination city
• State
• County where relevant
• Travel dates
• Applicable fiscal year

GSA provides a location based lookup tool for federal rates.

2. Separate Lodging From Meals and Incidentals

A common mistake is treating the allowance as one unrestricted pool of money.

Federal schedules separate lodging from meals and incidental expenses.

This matters because lodging policies may require different documentation and may be governed differently for tax substantiation purposes.

IRS Publication 463 notes that there is no optional standard lodging amount equivalent to the standard meal allowance for someone claiming their own travel expense deduction. Actual lodging costs are generally relevant when a taxpayer is deducting lodging expenses personally.

Employer reimbursement arrangements can operate differently when federal allowance methods are properly used.

3. Calculate the First and Last Travel Day Correctly

Federal employees do not normally receive the full M and IE rate on both the first and final day of official travel.

GSA states that the first and last travel day are reimbursed at 75 percent of the applicable M and IE rate.

Using the FY 2026 standard M and IE rate of $68, the federal first and last day amount is $51.

For a location with a $92 M and IE rate, the corresponding 75 percent amount is $69.

This rule is useful for understanding federal travel calculations, but private employers should follow their own written policy and applicable tax requirements.

4. Understand the Difference Between Federal and Company Rates

GSA establishes rates for federal employees travelling on official government business.

That does not mean every private employer must provide exactly the same allowance.

GSA itself notes that its rates and policies are for federal travellers and that contractor arrangements depend on the relevant contract or employer policy.

Private businesses may choose different reimbursement approaches.

However, federal rates can become important for tax purposes because IRS rules allow qualifying employers to use federal allowance methods to simplify substantiation.

An employer should therefore distinguish between:

• Internal travel policy
• Federal reimbursement benchmark
• Tax treatment

These three concepts are related but are not necessarily identical.

5. Keep Records of Time, Place and Business Purpose

Receiving a fixed daily allowance does not eliminate every recordkeeping obligation.

IRS guidance states that under qualifying allowance methods, employees still need to substantiate information such as the time, place and business purpose of travel within a reasonable period.

Useful records can include:

• Travel dates
• Business destination
• Reason for the trip
• Employer assignment
• Conference or meeting information
• Hotel documentation when required
• Expense reports

Good documentation is particularly important if the trip is later reviewed by the employer or tax authorities.

6. Understand Accountable Plan Rules

Tax treatment depends heavily on whether reimbursements are provided under an accountable plan.

According to the IRS, an accountable plan generally requires three things.

The expense must have a business connection.

The employee must adequately account for the expense within a reasonable period.

Any excess reimbursement that must be returned must be returned within a reasonable period.

When these requirements are satisfied, qualifying reimbursements generally are not treated as wages.

IRS Publication 15 for 2026 also explains that reimbursements above substantiated amounts may become taxable wages, with income tax withholding and employment taxes applying to the excess.

Why Accountable Plans Matter for Per Diem

A daily allowance is not automatically tax free simply because an employer calls it per diem.

The reimbursement arrangement has to satisfy the relevant tax requirements.

Employers should therefore have clear policies addressing business purpose, reporting deadlines and treatment of excess payments.

Employees should also understand what documents or travel information they are expected to provide.

7. Verify the Rate Every Time Travel Dates Change

Federal rates are updated periodically.

Rates can also change based on season and location.

A trip moved from September to October can cross into a new federal fiscal year.

This is particularly relevant in 2026 because FY 2027 rates begin October 1.

Instead of relying on an old spreadsheet or previously saved daily amount, travellers should verify the rate for the specific destination and dates.

This simple habit can prevent reimbursement errors.

How to Calculate Per Diem for a Business Trip

The basic calculation depends on the applicable daily allowances and length of travel.

Consider a simple example using the FY 2026 standard federal rates.

Assume an employee travels for four days and spends three nights at a destination using the standard rate.

The lodging allowance would be based on three qualifying nights at $110 per night.

That produces a lodging amount of $330.

For M and IE, the first day would use 75 percent of $68, which equals $51.

The second and third days would each use the full $68 amount.

The final day would again use $51.

The total meal and incidental allowance would therefore be $238.

Combined, the example federal allowance would be $568 before considering separate transportation expenses or any employer specific adjustments.

This example illustrates the method only.

Actual reimbursement depends on the destination, travel dates and the organisation’s policy.

What Happens When a Meal Is Provided?

Federal travel policies can require reductions when certain meals are provided as part of official travel arrangements.

For example, a conference may include breakfast or lunch.

Employers that use their own travel policies should clearly explain how included meals affect reimbursement.

The purpose is to avoid paying an allowance for an expense that the traveller did not actually need to bear when the employer’s policy requires an adjustment.

Per Diem Rates for High Cost Cities

Not every city uses the standard federal amount.

Higher cost areas frequently receive different rates because accommodation and meal prices can vary significantly across the United States.

GSA data for FY 2026 demonstrates this clearly.

Seattle has a $92 M and IE allowance, while destinations such as Spokane use $86 and the standard location rate remains $68.

New York State also shows multiple M and IE levels. Albany uses $86, Buffalo uses $80 and Binghamton uses $74 for FY 2026.

This is why employers should avoid assuming that a traveller’s daily limit is based only on the state.

Specific destinations and counties can matter.

Who Sets Per Diem Rates?

Different government agencies establish rates depending on where travel occurs.

GSA establishes rates for the 48 contiguous states and the District of Columbia.

Rates for Alaska, Hawaii and United States territories and possessions are established by the Department of Defense.

Foreign destination rates are established by the Department of State.

This division is useful for businesses with employees travelling internationally or outside the continental United States.

Using the wrong rate source can produce incorrect calculations.

Is Per Diem Taxable?

The answer depends on how the reimbursement is structured.

Under an accountable plan that satisfies IRS requirements, qualifying reimbursements up to the federal rate generally are not treated as regular wages when the employee adequately substantiates the required travel information.

When an allowance exceeds the federal rate, the excess may need to be included in taxable wages.

IRS Publication 15 states that an excess allowance above the substantiated amount is subject to income tax withholding and Social Security, Medicare and federal unemployment tax treatment.

A nonaccountable reimbursement plan can produce different tax treatment.

Under a nonaccountable plan, reimbursements are generally treated as wages.

Because tax circumstances differ, businesses should rely on current IRS guidance or professional tax advice when establishing reimbursement policies.

Per Diem vs Actual Expense Reimbursement

Businesses generally have more than one way to handle travel expenses.

One method is to reimburse actual qualifying costs.

The employee submits receipts and the employer reimburses approved expenses.

Another method uses fixed daily allowances where permitted.

Advantages of Per Diem

A structured daily allowance can simplify administration.

Potential benefits include:

• More predictable travel budgets
• Fewer small meal receipts
• Faster expense processing
• Clearer daily spending expectations
• Easier comparison across trips

It can also reduce the administrative burden on frequent business travellers.

Advantages of Actual Expense Reimbursement

Actual expense reimbursement may be more appropriate when travel costs are unusually high or difficult to predict.

It can also allow the business to reimburse exactly what was spent within its policy.

However, it generally requires more detailed receipt management.

The best approach depends on company size, travel frequency, accounting systems and the type of trips employees take.

Per Diem for Employers

Employers should avoid treating travel allowances as an informal cash benefit.

A well designed policy should explain:

• Who qualifies
• Which destinations and trips are covered
• How rates are selected
• Whether federal rates are used
• How travel days are calculated
• How supplied meals are handled
• What documentation employees must provide
• How excess reimbursements are treated
• When expense reports are due
• Who approves exceptions

Consistency can reduce confusion between employees, managers, payroll teams and accounting departments.

Creating a Clear Travel Reimbursement Policy

Employees should be able to understand the policy before beginning a trip.

A useful policy identifies where rates come from and how often they are updated.

It should also state whether lodging is booked directly by the company or reimbursed to the traveller.

When employees know the rules in advance, they can make better travel decisions and are less likely to face unexpected reimbursement disputes later.

Per Diem for Employees

Employees should review their employer’s travel policy rather than assuming federal rules automatically apply to them.

Before travelling, confirm:

• Approved destination
• Daily meal allowance
• Hotel limit
• Required receipts
• Travel dates
• Payment method
• Expense reporting deadline
• Company rules for included meals

If anything is unclear, asking before the trip is usually easier than correcting an expense report afterward.

Per Diem for Self Employed Workers

Self employed individuals have different tax reporting considerations from regular employees.

IRS Publication 463 states that self employed taxpayers generally report qualifying business expenses through the appropriate business tax forms rather than Form 2106.

The IRS also provides standard meal allowance methods that may simplify substantiation in qualifying circumstances.

However, business travel still needs to satisfy tax requirements, including having an appropriate business purpose.

Personal travel does not become deductible simply because someone operates a business.

Common Per Diem Mistakes to Avoid

One common error is using the same daily amount for every destination.

Another is forgetting that the first and final federal travel days can use reduced M and IE amounts.

Travellers may also confuse lodging allowances with meal allowances.

Employers sometimes create problems by failing to document the reimbursement arrangement or by paying amounts without requiring appropriate business travel information.

Other mistakes include:

• Using an outdated fiscal year rate
• Applying GSA rates to foreign destinations
• Ignoring seasonal lodging changes
• Failing to document business purpose
• Treating every allowance as automatically tax free
• Using the wrong destination location

Careful recordkeeping and rate verification can prevent many of these issues.

Why Per Diem Is Useful for Modern Business Travel

Business travel requires a balance between employee convenience and financial control.

Requiring detailed receipts for every small expense can create unnecessary administrative work.

At the same time, organisations need a consistent way to control travel spending.

A daily allowance can create a practical middle ground.

Employees know the amount available for qualifying expenses, while employers can establish standard procedures for reimbursement.

The approach works particularly well when combined with clear travel policies, reliable rate information and accurate expense reporting.

Frequently Asked Questions

What does per diem mean?

Per diem means by the day and commonly refers to a fixed daily allowance for qualifying business travel costs such as lodging, meals and incidental expenses.

What is the standard federal per diem rate in 2026?

For FY 2026, the standard CONUS lodging rate is $110 and the standard M and IE rate is $68. FY 2027 begins October 1, 2026, when standard lodging increases to $113.

Is per diem considered taxable income?

Qualifying reimbursements under an accountable plan can generally remain outside taxable wages up to applicable federal limits. Excess or nonaccountable payments may be taxable.

Do employees need receipts for per diem?

Federal allowance methods can reduce the need to document each covered expense, but employees still generally need to substantiate the travel dates, destination and business purpose.

Is per diem reduced on the first and last travel day?

Under federal travel rules, M and IE reimbursement on the first and last travel day is generally 75 percent of the applicable daily amount.

Are per diem rates the same everywhere?

No. Rates vary by location and sometimes by season. GSA sets rates for the continental United States, while other agencies establish rates for noncontinental and foreign destinations.

Conclusion

Per diem can simplify business travel by creating a structured approach to lodging, meals and incidental expenses, but the correct amount depends on destination, dates, employer policy and tax rules. Federal rates provide a useful benchmark and change periodically, making current rate verification essential. Employers benefit from clear reimbursement policies, while travellers benefit from understanding documentation and daily allowance rules before each trip.