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Travel Primarily for Business: Business Travel and Vehicle Expenses (2025 IRS Guide)

This guide covers “Travel Primarily for Business” within business travel and vehicle expenses. The following material presents the IRS treatment of this topic, including the qualifications, exceptions, and examples in the source section. Read the rules alongside the facts of your own situation before deciding what to report, deduct, or document.

Adapted from Publication 463 (2025), Travel, Gift, and Car Expenses, published by the Internal Revenue Service. This guide retains the source edition’s years, amounts, deadlines, and examples. It is guidance for that edition, not a statement that the same figures apply to every tax year.

Context for these rules

If any part of your business travel is outside the United States, some of your deductions for the cost of getting to and from your destination may be limited. For this purpose, the United States includes the 50 states and the District of Columbia.

How much of your travel expenses you can deduct depends in part upon how much of your trip outside the United States was business related.

Travel Primarily for Business

If you travel outside the United States primarily for business but spend some of your time on other activities, you generally can’t deduct all of your travel expenses. You can only deduct the business portion of your cost of getting to and from your destination. You must allocate the costs between your business and other activities to determine your deductible amount. See Travel allocation rules, later.

Tip:

You don’t have to allocate your travel expenses if you meet one of the four exceptions listed earlier under Travel considered entirely for business. In those cases, you can deduct the total cost of getting to and from your destination.

Travel allocation rules.

If your trip outside the United States was primarily for business, you must allocate your travel time on a day-to-day basis between business days and nonbusiness days. The days you depart from and return to the United States are both counted as days outside the United States.

To figure the deductible amount of your round-trip travel expenses, use the following fraction. The numerator (top number) is the total number of business days outside the United States. The denominator (bottom number) is the total number of business and nonbusiness days of travel.

Counting business days.

Your business days include transportation days, days your presence was required, days you spent on business, and certain weekends and holidays.

Transportation day.

Count as a business day any day you spend traveling to or from a business destination. However, if because of a nonbusiness activity you don’t travel by a direct route, your business days are the days it would take you to travel a reasonably direct route to your business destination. Extra days for side trips or nonbusiness activities can’t be counted as business days.

Presence required.

Count as a business day any day your presence is required at a particular place for a specific business purpose. Count it as a business day even if you spend most of the day on nonbusiness activities.

Day spent on business.

If your principal activity during working hours is the pursuit of your trade or business, count the day as a business day. Also, count as a business day any day you are prevented from working because of circumstances beyond your control.

Certain weekends and holidays.

Count weekends, holidays, and other necessary standby days as business days if they fall between business days. But if they follow your business meetings or activity and you remain at your business destination for nonbusiness or personal reasons, don’t count them as business days.

Example 1.

Your tax home is New York City. You travel to Quebec, where you have a business meeting on Friday. You have another meeting on the following Monday. Because your presence was required on both Friday and Monday, they are business days. Because the weekend is between business days, Saturday and Sunday are counted as business days. This is true even though you use the weekend for sightseeing, visiting friends, or other nonbusiness activity.

Example 2.

If, in Example 1, you had no business in Quebec after Friday, but stayed until Monday before starting home, Saturday and Sunday would be nonbusiness days.

Nonbusiness activity on the way to or from your business destination.

If you stopped for a vacation or other nonbusiness activity either on the way from the United States to your business destination, or on the way back to the United States from your business destination, you must allocate part of your travel expenses to the nonbusiness activity.

The part you must allocate is the amount it would have cost you to travel between the point where travel outside the United States begins and your nonbusiness destination and a return to the point where travel outside the United States ends.

You determine the nonbusiness portion of that expense by multiplying it by a fraction. The numerator (top number) of the fraction is the number of nonbusiness days during your travel outside the United States, and the denominator (bottom number) is the total number of days you spend outside the United States.

Example.

You live in New York. On May 4, you flew to Paris to attend a business conference that began on May 5. The conference ended at noon on May 14. That evening, you flew to Dublin where you visited with friends until the afternoon of May 21, when you flew directly home to New York. The primary purpose for the trip was to attend the conference.

If you hadn’t stopped in Dublin, you would have arrived home the evening of May 14. You don’t meet any of the exceptions that would allow you to consider your travel entirely for business. May 4 through May 14 (11 days) are business days and May 15 through May 21 (7 days) are nonbusiness days.

You can deduct the cost of your non-entertainment-related meals (subject to the 50% limit), lodging, and other business-related travel expenses while in Paris.

You can’t deduct your expenses while in Dublin. You also can’t deduct 7/18 of what it would have cost you to travel round trip between New York and Dublin.

You paid $750 to fly from New York to Paris, $400 to fly from Paris to Dublin, and $700 to fly from Dublin back to New York. Round-trip airfare from New York to Dublin would have been $1,250.

You figure the deductible part of your air travel expenses by subtracting 7/18 of the round-trip airfare and other expenses you would have had in traveling directly between New York and Dublin ($1,250 × 7/18 = $486) from your total expenses in traveling from New York to Paris to Dublin and back to New York ($750 + $400 + $700 = $1,850).

Your deductible air travel expense is $1,364 ($1,850 − $486).

Nonbusiness activity at, near, or beyond business destination.

If you had a vacation or other nonbusiness activity at, near, or beyond your business destination, you must allocate part of your travel expenses to the nonbusiness activity.

The part you must allocate is the amount it would have cost you to travel between the point where travel outside the United States begins and your business destination and a return to the point where travel outside the United States ends.

You determine the nonbusiness portion of that expense by multiplying it by a fraction. The numerator (top number) of the fraction is the number of nonbusiness days during your travel outside the United States, and the denominator (bottom number) is the total number of days you spend outside the United States.

None of your travel expenses for nonbusiness activities at, near, or beyond your business destination are deductible.

Example.

Assume that the dates are the same as in the previous example but that instead of going to Dublin for your vacation, you fly to Venice, Italy, for a vacation.

You can’t deduct any part of the cost of your trip from Paris to Venice and return to Paris. In addition, you can’t deduct 7/18 of the airfare and other expenses from New York to Paris and back to New York.

You can deduct 11/18 of the round-trip plane fare and other travel expenses from New York to Paris, plus your non-entertainment-related meals (subject to the 50% limit), lodging, and any other business expenses you had in Paris. (Assume these expenses total $4,939.) If the round-trip plane fare and other travel-related expenses (such as food during the trip) are $1,750, you can deduct travel costs of $1,069 (11/18 × $1,750), plus the full $4,939 for the expenses you had in Paris.

Other methods.

You can use another method of counting business days if you establish that it more clearly reflects the time spent on other than business activities outside the United States.

Using the guidance

Keep the documents that establish the dates, amounts, and circumstances described above. References to other chapters, forms, worksheets, or earlier and later sections refer to the linked IRS publication. Check the full publication and its updates before relying on a rule for a different tax year or a situation not addressed here.

Sources and further reading

The cited U.S. government text is in the public domain. Source accessed October 28, 2026. Fynoptic has organized this material for educational use and is independent of, and not endorsed by, the IRS.

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