Exterus and Hillbrook join forces in Global Employment Mobility

Combination of two independent specialists broadens the service offering and increases expertise and capacity for international employers

Amsterdam/Rotterdam/The Hague, September 7, 2026 – Exterus and Hillbrook Expatriate Tax Solutions are joining forces. Effective September 1, 2026, Exterus acquired the business activities of Hillbrook. Together, they form the largest independent provider of Global Employment Mobility services in the Netherlands.

Both Exterus and Hillbrook support international employers with cross-border employment matters. Since 2010, Hillbrook has provided international tax advisory, tax compliance, immigration and payroll services. Exterus supports organizations across areas including tax and social security, immigration and relocation, international payroll, the Expat Scheme and Employer of Record services.

“Exterus and Hillbrook are a strong fit, both professionally and culturally,” says Paul Roeten of Exterus. “We serve clients with similar profiles, share the same commitment to quality and personal service, and each bring specialist expertise and experience. By bringing our teams and knowledge together, we strengthen our specialist capabilities and can support clients across an even broader range of Global Employment Mobility matters.”

Broader offering and greater specialist capacity

The combination gives clients access to a broader range of services. Hillbrook clients, for example, will gain access to additional Exterus services in areas such as relocation and Employer of Record. In disciplines where both organizations are active, including tax, immigration and payroll, the combination also provides greater specialist expertise, capacity and continuity. Hillbrook’s digital solutions offer further opportunities to enhance the combined service delivery and make processes smoother and more efficient for clients and their employees.

With offices in Amsterdam, Rotterdam and The Hague, the combined organization will also have a strong presence across the Randstad region.

“We have taken great pride in building Hillbrook into a strong specialist organization over the years,” says Lyke Apontoweil of Hillbrook. “In Exterus, we have found a partner that is a strong fit with the way we work and our ambitions for the future. By moving forward together, we can connect our expertise and create new opportunities for both our clients and our people.”

Building the next chapter together

The Exterus and Hillbrook teams will work increasingly closely over the coming period, sharing knowledge and experience. From there, the organizations will take a step-by-step approach to identifying where services and processes can be further integrated.

About Exterus

Founded in 2006, Exterus is an independent Dutch specialist in Global Employment Mobility. Exterus supports international employers with cross-border employment matters, including tax and social security, immigration and relocation, international payroll, the Expat Scheme and Employer of Record services. From its office in The Hague, Exterus combines specialist expertise with a personal and pragmatic approach.

About Hillbrook

Founded in 2010, Hillbrook Expatriate Tax Solutions specializes in international tax advisory, tax compliance, immigration and payroll. From its offices in Amsterdam and Rotterdam, Hillbrook supports international employers and professionals with specialist expertise and a personal and pragmatic approach.