GTN Mobility Tax Blog

With today’s ability to work from anywhere, understanding and staying on top of the reporting and ongoing US filing requirements can be difficult. And for employees working outside of their typical Home location, not only understanding these requirements but also being diligent in adhering to them, is especially important. For US citizens, permanent residents working outside of the US, and nationals of other countries who become tax residents of the US, there is a specific annual filing requirement related to non-US financial accounts held.

As companies continue to expand globally, they are placing greater focus on optimizing their business objectives and employee development. Many are reassessing the costs, benefits, and overall impact of their relocation strategies, while looking for effective ways to move talent across borders. 

Traditional global mobility assignment structures remain essential tools for achieving these goals. The three most common global mobility assignment structures are long-term assignments, short-term assignments, and permanent (or one-way) transfers. Each provides distinct advantages depending on the organization’s priorities, timelines, and talent needs.  

Globalization has entered a new era, one where even well‑established companies may suddenly find themselves navigating unfamiliar international territory. For HR professionals, these shifts tend to move rapidly from long‑term strategy to urgent operational action.

Compensation collection for international assignments comes with many moving parts, and payroll and mobility teams often run into the same core questions. From coordinating global data to navigating split payroll, per diems, and year-end reporting, each step has its own requirements and potential pitfalls.

Whether you manage business travelers, short-term international employees, or remote workers, you have no doubt heard about the "183-day rule."

This commonly referenced rule is part of many international income tax treaties and generally states that an individual may be exempt from income tax in a Host country if they are present in that country for fewer than 183 days within a defined period – often a calendar year or rolling 12-month period. However, this threshold is just one of several conditions that must be met for the exemption to apply.

Globally, many tax jurisdictions expect an employer (as well as the employee) to track and report business travel outside of their Home location. However, simply applying a “183-day” threshold does not always work to ensure tax compliance. On that basis we will take a deeper dive into the impact of income tax treaties on the tax cost of business travel, short-term assignments, and remote work scenarios.

An offer to take on an international assignment is often seen by employees as both a vote of confidence from their employer and a valuable opportunity for career growth. Though both are true, it’s also important to look beyond the professional benefits and consider the logistical, financial, and regulatory implications involved—particularly around immigration, tax compliance, and compensation across both the Home and Host countries.