GSA Per Diem Rates Explained
What "Per Diem" Actually Means
Per diem (Latin for "per day") is a fixed daily allowance for business travel expenses -- typically covering lodging and meals -- instead of requiring itemized receipts for every expense. Many private employers base their own travel policies on the federal government's GSA rates, even for non-government travel.
Rates Vary by Destination
The GSA sets different per diem rates for different cities and counties across the US, reflecting real differences in the cost of lodging and meals -- a rate for a major city is typically much higher than for a rural area. Rates are updated on the federal fiscal year (starting October 1).
Finding Your Exact Rate
Look up your specific destination's current rate at the GSA's official per diem rates page -- this site doesn't maintain its own copy of that full location-based table, since it changes by city and by year.
Calculating Your Total Trip Allowance
Once you have your destination's daily rate, use the Per Diem Trip Cost Calculator to multiply it by your number of trip days for a total allowance.
Lodging and Meals Are Two Separate Pieces
A GSA per diem rate is made up of two parts: a lodging rate and a meals and incidental expenses rate, often shortened to M&IE. The lodging portion is the maximum for a hotel room per night, and it can differ by month in some locations because hotel prices change with the season. The M&IE portion covers meals plus small incidentals like tips to porters. Understanding the split matters because many policies reimburse the two parts in different ways, for example actual lodging cost up to the cap and a flat amount for meals.
A Worked Example (Illustrative Numbers Only)
Suppose a hypothetical destination has a lodging rate of $150 per night and an M&IE rate of $70 per day. For a four-day trip with three nights of lodging, the lodging limit would be 3 times $150, or $450, and meals would be 4 times $70, or $280, for a combined ceiling of $730. These numbers are made up to show the arithmetic. Look up your actual destination for real figures, and note that the first and last day of travel are often treated differently.
First and Last Day of Travel
Under the federal rules, the M&IE allowance for the day you leave and the day you return is commonly set at a partial amount, often 75 percent of the daily rate, rather than the full rate. Check the GSA website for the current rule before you calculate a trip. If your employer uses its own policy, it may treat travel days differently, so ask your travel or payroll department.
Meals Provided at a Conference or by a Host
If some meals are provided, such as a conference lunch or a hotel breakfast included in the room rate, the federal system typically has you deduct a set portion of the M&IE for that meal. Private employers may follow a similar approach or simply require you to claim only what you actually spent. Read your travel policy so you do not claim a meal twice.
Per Diem vs. Actual-Expense Reimbursement
- Per diem is simpler, with less paperwork and a predictable budget. The trade-off is that you may spend more or less than the allowance.
- Actual-expense reimbursement pays what you truly spent with receipts, usually up to a cap. It can be fairer for expensive cities, but it takes more record-keeping.
- Some employers combine the two, paying actual lodging and a flat meals allowance.
Common Mistakes
- Using an old fiscal year's rate after the October update.
- Looking up the rate for the wrong city or county, since the rate follows the location of the work or lodging, not always the airport you fly into.
- Forgetting that lodging taxes are usually handled separately from the lodging rate cap.
- Assuming your employer uses the federal rate when its policy actually sets a lower one.
- Keeping no records at all. Even under per diem, dates, destinations, and the business purpose of a trip should be documented.
Tips for Self-Employed Travelers
If you run your own business, you may be able to use per diem for meals in place of tracking each receipt, subject to IRS rules that can differ from a private employer's policy, including limits on the deductible percentage of meal costs. Because these rules are specific and change, check the current IRS publications or ask a tax professional before relying on per diem for a deduction.
How to Use the Calculator Well
Enter the actual number of days for the trip, then apply first and last day adjustments if your policy calls for them. Run one scenario using the federal rate and another using your employer's own limit so you can see the difference. If your trip crosses two locations with different rates, calculate each portion separately.
Keeping Good Trip Records
Whether you are an employee or a business owner, keep a simple travel log: the dates, the destination, the business purpose, and any receipts for lodging. Even where meals are covered by a flat allowance, this record supports your claim if anyone asks questions later. Photos of receipts on your phone, saved into a folder for each trip, take only a minute and save real headaches at reimbursement or tax time.
Frequently Asked Questions
Do private employers have to use GSA rates?
No -- GSA rates are mandatory only for federal government travel. Private employers often reference them as a reasonable, ready-made standard, but can set their own per diem policy.
Is per diem taxable income?
Generally not, as long as it doesn't exceed the federal per diem rate and proper accounting procedures are followed -- amounts paid above the federal rate can become taxable. Check with your employer's payroll/tax team for your specific situation.
How often do GSA per diem rates change?
The rates are updated each federal fiscal year, which begins October 1. Some locations may also have rates that vary by month. Confirm the current numbers on the official GSA page before planning a trip.
What if my destination is not listed on the GSA rates page?
Locations without a specific entry generally use a standard rate that applies to areas not listed individually. The GSA page shows how to find the standard rate for your travel dates.
Can I keep the difference if I spend less than the per diem?
Under a true per diem arrangement, some employers allow this because you are not required to itemize. Others require receipts or reimbursement of actual costs. Follow your employer's written policy.
Does per diem cover the flight or rental car?
No. Per diem covers lodging and meals and incidental expenses. Transportation costs such as airfare, rental cars, and taxis are handled separately under the travel policy.
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