Deducting a Business Trip Abroad: The Two Tests, and Why You Only Need One

By Craig S. Cody, CPA, Certified Tax Coach.

I take my own firm's board meeting to London for five days. The agenda runs six hours and fifteen minutes a day. The hotel is in Nine Elms, a few minutes' walk from the U.S. Embassy, and the London Eye is about a mile up the river.

None of the airfare has to be allocated to personal days. Not because I'm a CPA, but because two numbers were settled before anything got booked.

Here is the short answer, and it is the part most agency owners have backwards. A business trip outside the United States is treated as entirely for business, even if part of it was not, as long as you clear just one of two tests. Either the travel does not exceed one week, or less than 25% of your time abroad was non-business. One of them. Not both.

That "or" is doing an enormous amount of work, and I see it read as "and" constantly.

Why Do Foreign Trips Follow Different Rules Than Domestic Ones?

Because a different provision governs them. Domestic business travel turns on whether the trip was primarily for business. Foreign travel runs through IRC Section 274(c), which begins by disallowing the portion of your travel expense that is not allocable to the business, then hands back a set of exceptions.

Section 274(c)(2) switches that allocation off if:

(A) such travel does not exceed one week, or (B) the portion of the time of travel outside the United States away from home which is not attributable to the pursuit of the taxpayer's trade or business ... is less than 25 percent of the total time on such travel.

IRS Publication 463 states the same structure and adds two more, presenting all four as "at least one of the following four exceptions." The other two: you had no substantial control over arranging the trip, or you can establish that a personal vacation was not a major consideration.

Four doors. You need one of them.

One thing Section 274(c) does not do: it does not create the deduction. It only decides whether otherwise-deductible transportation costs have to be allocated between business and personal days. The trip still needs a bona fide business purpose, and the one-week exception is not permission to turn a vacation into a deductible business trip.

What Are the Two Tests Most Agency Owners Will Use?

Test one is time. A week or less outside the United States and the whole trip is treated as entirely for business. A week means seven consecutive days. Do not count the day you leave the United States. Do count the day you return.

The trip: out Sunday, meetings Monday through Friday, home Saturday. Six days. Through the door with a day to spare.

Test two is percentage. Less than 25% of your time abroad on non-business activity. Read from the other side, that is 75% or more on business. This is the test that does the work when a trip runs past a week.

Notice what test two is not. It is not a condition stacked on top of test one. A five-day trip that is 60% business, assuming it is otherwise a bona fide business trip, still clears, because it satisfies (A). Nothing gets allocated just because 40% of the time was personal. If you have been told a foreign trip must always be 75% business, that is the two tests welded into one, and it costs you deductions you were entitled to.

What Counts as a Business Day?

A day counts when the principal activity during working hours was business. In practice that gets read as more than half a normal working day, which is where the familiar "four hours and one minute" comes from.

Worth saying plainly: four hours and one minute is a practitioner rule of thumb, not a number you will find in the statute. My agenda runs six hours and fifteen minutes. I would rather not argue about fifteen minutes two years from now.

The categories themselves are not folklore. Treas. Reg. Section 1.274-4(d)(2) lists five, and this is the regulation written specifically for travel outside the United States:

1. Transportation days, in both directions.
2. Presence required, where you had to be somewhere specific for a bona fide business purpose.
3. Days primarily business.
4. Circumstances beyond control, where something outside your control kept you there.
5. Weekends, holidays, etc. This is the one worth planning around, and it gets its own section below.

How Does the Weekend Rule Actually Work?

Subsection (d)(2)(v) is the one practitioners call the sandwich rule, and it is broader than "weekends" suggests. It reaches any day that was "a Saturday, Sunday, legal holiday, or other reasonably necessary standby day" which "intervened during that course of the taxpayer's trade or business while outside the United States away from home."

So a standby day you could not avoid can qualify too, not just a calendar weekend.

There is a condition, and it is the part that gets left out. The regulation only helps where the taxpayer "endeavored to conduct" that business "with reasonable dispatch." You cannot stretch a two-day agenda across ten days and call the gaps business days. The rule protects a trip that had to span a weekend. It does not protect a padded one.

The regulation's own examples are unusually concrete, and one of them is my exact trip.

• A taxpayer travels from New York to London for negotiations that begin on a Wednesday and conclude the following Tuesday. The intervening Saturday and Sunday are business days whether or not any business is conducted on them. That example is in the regulation. I did not pick the destination to match it.
• If a second set of meetings with a different group then runs on the Thursday and Friday, the Wednesday sitting between the two blocks is also a business day. So this is not a weekends-only rule. A gap day between two business blocks qualifies on the same logic.
• But if the taxpayer stays on after the Friday meetings end, for personal reasons, the following Saturday and Sunday do not count. Nothing sandwiches them.

This is why placement beats duration. Converting intervening days into business days lowers your non-business share of total time abroad, which is exactly how a longer trip clears the under-25% test in Section 274(c)(2)(B). The same two days off cost you nothing in the middle of a trip and can cost you part of your airfare on the end.

What Does an Extra Weekend Actually Cost You?

Here is where a foreign trip punishes you in a way a domestic one does not.

Say the meetings end Friday and I stay through the weekend and Monday to see the city, flying home Tuesday. That is nine days outside the country instead of six.

Test one just closed. So everything rests on test two, and three personal days out of nine is 33% non-business. That is not under 25%. Test two closes too.

Now the transportation gets allocated. Generally you deduct the business portion rather than losing the airfare entirely: six business days out of nine, so roughly two thirds of the ticket.

Domestically that same weekend costs you nothing. Overseas it can cost a real fraction of a transatlantic ticket. Which is exactly why you decide the shape of the trip before you book it, not at filing time.

The Rule Almost Nobody Mentions

There is a second provision that exists only once you leave the continent, and I have yet to have an agency owner arrive already knowing about it.

IRC Section 274(h)(1) says that for a convention, seminar, or similar meeting held outside the "North American area," you have to establish both that the meeting is directly related to the active conduct of your business and that it was as reasonable to hold it there as it would have been here. The statute lists the factors: the purpose of the meeting and the activities taking place at it, the purposes and activities of any sponsoring organization, the residences of the active members and where other meetings have been or will be held, and other relevant factors.

Section 274(h)(3)(A) defines the North American area as the United States, its possessions, the Trust Territory of the Pacific Islands, Canada and Mexico. The United Kingdom is not on that list. Neither is anywhere else in Europe.

Is a company's own board meeting a "similar meeting"? Genuinely arguable. Factors (B) and (C) presuppose a sponsoring organization that a self-convened board does not have.

But it is my board, and I write the minutes. So the reason for the location goes in them before I get on the plane, not after somebody asks.

What About Meals, Your Spouse, and Records?

Meals are 50%. Not 100%. There was a window in 2021 and 2022 when restaurant meals were fully deductible, and it closed on December 31, 2022. Section 274(n)(1) caps the deduction at half again. If someone is still telling you a hundred, they are a couple of tax years behind.

Your spouse's airfare is not deductible unless they are a bona fide employee traveling for a bona fide business purpose and the expense would otherwise be deductible by them. That is Section 274(m)(3). Being good company does not satisfy it.

Records are stricter here than almost anywhere else in the code. Travel, meals, vehicles and gifts are the four categories under Section 274(d) where ordinary substantiation is not enough. Keep receipts for lodging and for anything over $75, and keep a contemporaneous log of the business purpose. The agenda, the minutes, the calendar and the emails from the planning are what establish that purpose.

Sometimes the difference between deductible and non-deductible isn't how much you spent. It's how you structured the calendar.

Frequently Asked Questions

Does a business trip outside the U.S. have to be 75% business to deduct the airfare?

No. Under IRC Section 274(c)(2) the two tests are alternatives joined by "or." If the travel does not exceed one week, the trip is treated as entirely for business regardless of its business percentage. The 75% figure is the inverse of the separate "less than 25% non-business" test, which governs trips that run past a week.

How do you count the week for foreign business travel?

One week means seven consecutive days. Per IRS Publication 463, you do not count the day you leave the United States, but you do count the day you return.

Do weekends count as business days on an international business trip?

Yes, when they are sandwiched. Treas. Reg. Section 1.274-4(d)(2)(v) treats a Saturday, Sunday, legal holiday, or other reasonably necessary standby day as a business day when it intervened during business you were conducting with reasonable dispatch. The regulation's own example is a New York to London trip where the intervening weekend counts even though no business was done on those days. Weekends you stay over for personal reasons after the business has ended do not count.

Does the sandwich rule only apply to weekends?

No. The same regulation treats a Wednesday sitting between two separate blocks of business meetings as a business day. Any intervening day can qualify, which is why the subsection is titled "Weekends, holidays, etc." rather than just weekends.

Are meals on an international business trip 100% deductible?

No. They are 50% under IRC Section 274(n)(1). The temporary 100% deduction for restaurant-provided food and beverages applied only to amounts paid or incurred in 2021 and 2022.

Can I deduct my spouse's airfare on a business trip?

Only if your spouse is an employee of the business, is traveling for a bona fide business purpose, and the expense would otherwise be deductible by them. All three conditions come from IRC Section 274(m)(3).

What happens if I do not meet any of the exceptions?

Your transportation is allocated on a day basis, business days divided by total days, and you deduct only the business share. Lodging and meals continue to follow the individual day, so they are deductible on business days and not on personal ones.

The Next Step

Most owners book the trip and then go hunting for the business reason. That is the version that falls apart. The order is the whole thing.

If you want to know how your own travel has actually been structured, and what it cost you, Book a Free Tax Analysis: https://www.craigcodyandcompany.com/services/free-analysis/

If your trips are domestic, start with the companion piece on turning a trip into a legal tax deduction, which covers the domestic day-counting rules this article assumes.

Nobody's looking out for your money but you. Let's go look together.

Craig S. Cody is a CPA, Certified Tax Coach, and retired NYPD Lieutenant. His firm works with more than 70 marketing and advertising agency owners every month, helping them keep more of what they make through proactive tax planning.

This article is general education, not advice for your specific situation. Confirm your own facts with your advisor before acting.