Per Diem for Business Travel With 2026 Rates, a Calculator and Expense Tracking Tips

A three-night sales trip to a mid-sized US city comes with a federal per diem ceiling of $577 in October 2026. That covers the hotel, every meal and the tips. It doesn't cover the flight, the rental car or the $32 airport parking bill waiting when you land back home.

That split is where most travel expense problems start. Per diem makes meals and lodging simple, while everything else still needs a receipt and a line on an expense report.

This guide covers both halves. You'll see what per diem means, how GSA rates work, how to calculate a trip, and how to track and submit the costs that per diem leaves out.

What Is Per Diem?

Per diem is Latin for "per day." For business travel, it's a fixed daily amount an employer pays to cover the living costs of a work trip, so the traveler doesn't have to save a receipt for every coffee.

A per diem usually has two parts:

• Lodging, a nightly cap for hotels or short-term rentals.
• Meals and incidental expenses (M&IE), a daily amount for food plus small tips to porters, bellhops and hotel housekeeping.

Some employers pay both parts as per diem. Others pay M&IE as a flat rate and reimburse the actual hotel bill. Either way, per diem is meant to replace travel costs, not to act as extra salary.

You may also see "per diem" on job postings, especially in nursing and staffing. There it means something different: a worker who picks up shifts as needed instead of holding a fixed schedule.

How Do GSA Per Diem Rates Work?

Most US companies don't invent their own numbers. They borrow the rates set by the General Services Administration (GSA) for federal employees, because the IRS treats payments at or below those rates as covered travel costs rather than wages.

GSA sets rates on the federal fiscal year, which starts October 1. For 2026, that means two sets of numbers:

The standard rate covers most of the continental US. About 300 cities and resort areas, called non-standard areas, get higher lodging caps and M&IE rates of $74, $80, $86 or $92. Some of those lodging caps change by month to follow tourist seasons, so a trip to the same city can have a different cap in July than in January.

To find the rate for a trip, use GSA's per diem lookup. Choose the fiscal year that matches your travel dates, then search by city or ZIP code. The rate depends on where you work that day, not where the hotel is.

Employers who don't want to track hundreds of city rates can use the IRS high-low method instead. From October 1, 2026, it pays $329 a day in listed high-cost areas and $230 everywhere else in the continental US, under IRS Notice 2026-60.

How to Calculate Per Diem for a Business Trip

Working out a trip allowance takes four steps:

1. Look up the lodging cap and M&IE rate for the destination and dates.
2. Multiply the lodging cap by the number of nights in paid lodging.
3. Give 75% of the M&IE rate for the departure day and the return day, and the full rate for every day in between.
4. Subtract any meal someone else paid for, such as a conference lunch.

Here's a real example. An account manager flies out Tuesday, October 6, 2026 and returns Friday, October 9, to a city with the standard rate.

Using a Per Diem Calculator to Work Out Your Travel Allowance

A per diem calculator runs the same formula for you:

Most calculators ask for four things: the destination, the travel dates, whether any meals were provided, and whether your employer follows GSA or IRS high-low rates.

For a quick estimate, this table shows maximum allowances for trips to a standard-rate area from October 1, 2026:

Higher-cost cities will come out above these numbers. Treat the table as a floor for budgeting, and check the exact city rate before you book.

What Expenses Are Covered by Per Diem?

Per diem covers the cost of staying somewhere, not the cost of getting there.

If you drive your own car, mileage is paid at the IRS standard rate, which is 76 cents a mile for business miles driven from July 1, 2026. Our guide to the IRS mileage rate for 2026 walks through the math.

Company policies vary, so check whether yours folds local transport or other items into the daily rate.

Per Diem vs. Actual Business Expenses

With actual expenses, you're reimbursed for what you really spent, backed by receipts. With per diem, you get the daily rate whether you spent more or less.

Do You Still Need to Keep Receipts When Using Per Diem?

Yes, for some things. Per diem proves how much you spent on meals, but it doesn't prove the trip happened.

Under IRS Publication 463, you still need:

• Proof of the time, place and business purpose of each trip
• A receipt for lodging whenever it's reimbursed or deducted at actual cost
• A receipt for any other travel expense of $75 or more

In practice, that means keeping the hotel folio, airfare and rental car receipts, plus anything else that crosses $75. Keep these records for at least three years after you file, which is how long the IRS generally has to review a return. Clear digital copies count.

How to Track Business Travel Expenses and Receipts

The easiest trips to expense are the ones tracked while they happen.

1. Before the tripCheck your company's per diem policy and look up the rate for your destination and dates. Write down the business purpose now, while it's fresh.
2. During the tripPhotograph each receipt the day you get it, before it fades or disappears. Keep personal charges, like a movie rental on the hotel bill, separate from business costs. Note any meals that were provided, since they lower your allowance.
3. After the tripMatch every receipt to the trip, total your per diem, and file the expense report within your company's deadline.

A receipt app keeps this from turning into a shoebox job. With ManageReceipt's receipt scanner, you snap a parking stub or hotel folio as soon as you have it, and the app reads the details for you. Receipts stay organized in one place, so you aren't digging through email and jacket pockets on the last day of the month.

How to Organize Receipts for Employee Reimbursement

Reimbursement request checklist

• Trip dates, destination and business purpose
• Your per diem total, with travel days at 75% and any provided meals removed
• Receipts for lodging (if paid at cost) and every item outside per diem
• A short note for anything unusual, like a rebooked flight or an approved hotel above the cap

With ManageReceipt, you can turn a trip's receipts into an expense report for your manager. If you're self-employed, the same records roll into tax reports at filing time.

FAQs About Per Diem and Business Travel Expenses

Keeping Per Diem Simple on Your Next Trip

Per diem handles the daily costs. Your job is to handle everything around it.

Look up the right rate for your dates, take out meals someone else covered, and save receipts for lodging and anything over $75. Track those as you go and the expense report almost writes itself.

This guide explains general US rules for business travel. It isn't tax or legal advice, so check with a CPA or enrolled agent about your own situation.