16 Oct When Does a Business Trip Become a Global Mobility Problem?

A business trip does not have to last several months before it becomes a global mobility issue. In some cases, a few days in another country can be enough to create immigration, tax, payroll or corporate compliance questions.

What matters is not simply how long someone travels, but what the employee does while there, how often the person returns and which part of the organization benefits from the work.

That distinction is becoming increasingly important as business travel, remote work and traditional assignments begin to overlap. KPMG’s 2025 Global Mobility Benchmarking Report notes that mobility strategies increasingly encompass flexible arrangements including remote work, commuting and frequent business travel rather than focusing solely on conventional relocations. global-mobility-benchmarking-su…

When an ordinary trip stops being ordinary

Sending an employee overseas for a conference or several internal meetings is generally very different from sending someone to install equipment, manage employees, deliver consulting services or negotiate business with customers.

The second group of activities can begin to look less like visiting and more like working in the country.

That distinction matters because business visitor status does not necessarily authorize someone to perform productive work. Immigration rules vary considerably by jurisdiction, as do the tax and payroll consequences of an employee working there.

A software engineer spending a week at a customer site implementing a system, for example, presents a different set of questions from an employee attending a two-day planning meeting. Similarly, an executive who travels into the same country every month to negotiate customer contracts deserves more scrutiny than the duration of each individual trip might suggest.

There is no universal safe number of days

Companies sometimes focus on day counts, particularly the familiar 183-day tax threshold. But there is no single number below which international business travel is automatically risk-free.

The OECD’s work on the global mobility of individuals illustrates why. Under some tax treaties, employment income may become taxable in the country where the work is performed depending not only on whether an employee exceeds 183 days, but also on factors such as who pays the employee and whether a permanent establishment bears the compensation cost. In other words, 183 days should not be treated as a universal permission to work abroad for anything less than that period.

Immigration rules can impose restrictions much sooner, while payroll, social security and local employment requirements can follow their own thresholds.

What the employee actually does matters

The nature of the employee’s activities can be just as important as the length of the trip.

One particularly important issue is permanent establishment, or PE—the possibility that an employee’s activity creates a taxable corporate presence for the employer in another jurisdiction.

The OECD identifies several ways employee activity can raise PE questions, including a fixed place of business, activities creating a dependent-agent PE and, under applicable rules, a services PE. It also notes that preparatory or auxiliary activities may receive different treatment. 

This is why the salesperson who repeatedly travels abroad and plays a central role in concluding contracts may present greater corporate-tax risk than an employee who spends more days attending internal meetings.

Remote work creates similar questions. KPMG’s guidance on work-from-anywhere arrangements emphasizes that cross-border work can affect withholding, reporting, social security and corporate tax, making it important to know where employees are working, for how long and what activities they perform. The cumulative pattern is easy to miss

Another common problem is evaluating each trip separately.

Ten five-day visits may look harmless when someone reviews each travel request individually. Collectively, however, they represent 50 days of employee presence in one country and may also reveal something more significant: the employee is effectively supporting an ongoing local role.

That is one reason companies are putting more emphasis on tracking.

Deloitte’s 2026 Business Travel and Remote Work Survey found organizations increasingly moving compliance checks into the pre-trip approval process. Companies are also using information from travel systems, expense reports and other data sources to understand where employees are actually working. Deloitte points to coordination among mobility, tax, payroll and HR as an important part of managing the resulting risks. The goal is not necessarily to turn every business trip into a formal international assignment. It is to identify the trips that deserve review before a problem develops.

Business travel is becoming part of mobility

This is where the boundaries of global mobility are changing.

A mobility team may once have concentrated primarily on expatriates and permanent transfers. Today it may also need visibility into frequent travelers, international commuters and employees who extend a vacation and continue working remotely from another country.

Lewis Silkin’s assessment of global mobility trends in 2026 points to rising business travel alongside greater enforcement in areas including immigration, tax, social security and employment. The firm argues that mobility issues increasingly need to be considered at the beginning of business decisions rather than addressed after travel has already occurred. 

For employers, a practical rule is therefore relatively simple: when an employee will actually work abroad, return repeatedly to the same country, support a local operation or customer, conduct significant commercial activity, or work remotely outside an approved arrangement, the trip deserves a mobility review.

That review does not have to make international travel cumbersome. Done early, it can determine whether the employee needs different immigration permission, whether tax or payroll action is required and whether another deployment arrangement makes more sense.

The challenge for global mobility is no longer limited to moving employees from one country to another. Increasingly, it is also knowing when an apparently ordinary business trip has quietly become something more.