Expanding your US-based team into Belgium opens the door to a multilingual, highly skilled talent pool at the heart of Europe. But Belgian employment law is one of the most protective systems on the continent, and getting it wrong can trigger fines, back taxes, and permit rejections. Whether you plan to open a local entity, use an Employer of Record, or send an existing employee on assignment, you need a clear roadmap. This guide walks you through every legal step, from choosing the right hiring structure to registering with Belgian social security authorities, so your first Belgian hire is fully compliant from day one.
Hiring Structures Available to US Employers
A US company looking to employ someone in Belgium has three primary options: establishing a Belgian entity, engaging an Employer of Record (EOR), or seconding an existing US employee. Each approach carries different regulatory, tax, and operational implications.
Setting Up a Belgian Entity
Registering a subsidiary or branch in Belgium gives you full control over employment relationships. However, it requires registration with the National Social Security Office (NSSO/ONSS), the tax authorities, and an occupational accident insurer. A foreign employer does not strictly need a local entity to hire in Belgium, but without one, the administrative burden increases significantly.
Using an Employer of Record
An Employer of Record is a third-party organization that acts as the legal employer on paper, handling contracts, payroll, and compliance while you retain day-to-day management of the worker. This is the fastest route if you want to hire without setting up your own entity.
Seconding a US Employee
If you are sending a current US team member to Belgium temporarily, you must file a Limosa declaration and, for stays exceeding 90 days, apply for a single permit. An employment lawyer in Brussels can help you structure the secondment to stay compliant with both Belgian and US law.
The Single Permit and Work Authorization
The single permit is a combined work-and-residence authorization introduced in Belgium in January 2019. It is required for any non-EEA national who will work in Belgium for more than 90 days. The employer, or a Belgian-based representative acting on the employer's behalf, must file the application with the competent region: Brussels, Flanders, or Wallonia.
Who Needs a Single Permit?
US citizens are non-EEA nationals and therefore need a work permit before starting any employment in Belgium. The most common categories used by US companies are highly skilled workers and managerial employees, both of which must meet minimum salary thresholds set by each region. Belgium's regions have announced updated 2026 salary criteria that vary by region and skill level.
Processing Times and Recent Changes
The legal processing time for a single permit is four months. As of May 2026, all applications for the Brussels-Capital Region must be submitted through the federal "One-Stop counter" digital portal. In Flanders, a major reform that took effect on 1 January 2026 tightened eligibility and reduced the list of medium-skilled shortage occupations to just 21 professions. Working with an experienced Belgian employment law practice is essential to navigate these regional differences.
Belgian Employment Contract Requirements
Belgian labour law mandates that employment contracts clearly outline job description, remuneration, working hours, and notice periods. While a written contract is not technically required for open-ended, full-time positions, it is strongly recommended and practically necessary when specific clauses are involved.
Fixed-term, part-time, or temporary contracts must be in writing and signed before the employee starts work. Clauses such as non-competition agreements have strict enforceability criteria under Belgian law. For US companies unfamiliar with Belgian contract conventions, having contracts reviewed by a local employment law specialist prevents costly disputes later.
Social Security and Payroll Obligations
Employees working in Belgium are generally subject to the Belgian social security system. Employer contributions amount to approximately 25 to 33% of gross salary for white-collar workers, while employee contributions are fixed at 13.07%. In addition, Belgium uses automatic wage indexation linked to the smoothed health index, which adjusts wages in line with inflation.
A bilateral social security agreement between the US and Belgium prevents double taxation of social security contributions. If a US employee is seconded to Belgium for fewer than five years, they may remain under the US social security system. Salaries must be paid monthly in euros, and many employees expect a 13th-month bonus and double holiday allowance. The statutory minimum gross wage (GAMMI) for a 38-hour workweek stands at approximately EUR 2,154 per month as of 2026.
Entity vs. EOR vs. Secondment: Side-by-Side
| Factor | Belgian Entity | Employer of Record | Secondment |
|---|---|---|---|
| Setup time | 2-4 months | Days to weeks | 3-4 months (visa) |
| Legal employer | Your subsidiary | EOR provider | US parent company |
| NSSO registration | Required | Handled by EOR | Required or exempted via Limosa |
| Permanent establishment risk | None (entity exists) | Low | Moderate |
| Control over HR policies | Full | Limited | Full |
| Best for | Long-term, multi-hire | First hire, speed | Temporary assignment |
| Typical cost layer | Entity maintenance | Service fee per employee | Double admin overhead |
Tax Considerations for US Companies
Hiring in Belgium can create a permanent establishment (PE) for corporate tax purposes if your employee's activities amount to a fixed place of business. To reduce PE risk, monitor how much time employees spend in Belgium and keep detailed records of their work locations.
US executives temporarily assigned to Belgium within an international group may qualify for the special expatriate taxation regime. Under this regime, the executive is treated as a Belgian non-resident, taxed only on income earned in Belgium. The portion of salary relating to work performed outside Belgium is not subject to Belgian income tax. Consult our full range of employment law services for guidance on structuring international assignments tax-efficiently.
Key Takeaways
- US companies can hire in Belgium without a local entity, but must register with the NSSO and appoint a Belgian representative.
- The single permit is mandatory for non-EEA nationals working in Belgium for more than 90 days and must be filed by the employer or their Belgian agent.
- Belgium's three regions (Brussels, Flanders, Wallonia) each set their own salary thresholds and permit conditions, and 2026 brought significant reforms in Flanders.
- Employer social security contributions range from 25% to 33% of gross salary, and wages are automatically indexed to inflation.
- A US-Belgium bilateral agreement can prevent double social security contributions for secondments of up to five years.
- Written employment contracts are strongly recommended and legally required for fixed-term or part-time arrangements.
- Working with a Belgian employment lawyer early in the process helps avoid permit rejections, contract defects, and PE exposure.
Frequently Asked Questions
Does a US company need a Belgian entity to hire someone in Belgium?
No. A foreign employer does not need a local entity to hire employees in Belgium. However, you must complete several registrations, including with the NSSO and the tax collector's office, and appoint a Belgian-based authorized representative. Many US companies use an EOR or a Belgian payroll agency to simplify this process.
What is the single permit in Belgium?
The single permit is a combined residence-and-work authorization for non-EEA nationals staying in Belgium for more than 90 days. It replaced the separate work permit and residence permit system in January 2019. The employer must apply through the competent regional authority.
How long does it take to get a Belgian work permit for a US employee?
The legal processing time for a single permit is four months. In practice, first authorizations average about 14 weeks. You should also allow roughly three months for the long-stay visa (type D) to be issued by the Belgian embassy.
What are Belgian employer social security contributions?
Employer contributions to the NSSO are approximately 25% for standard payroll calculations, though they can reach around 33% of gross salary for white-collar employees when all charges are included. Employees contribute a fixed 13.07% deducted from gross salary.
Can a US employee stay on the US social security system while working in Belgium?
Yes, under the US-Belgium bilateral social security agreement, a seconded employee can remain subject to US social security rules if the assignment is not expected to exceed five years. A Certificate of Coverage must be obtained from the US Social Security Administration.
What salary must a US company pay a Belgian hire?
Belgium's guaranteed minimum monthly income (GAMMI) is approximately EUR 2,154 gross for a 38-hour workweek in 2026. However, many sectors set higher minimums through collective bargaining agreements. Single permit applicants must also meet regional salary thresholds that vary by worker category.
What is the risk of creating a permanent establishment in Belgium?
If your Belgian-based employee performs core business activities from a fixed location, Belgian tax authorities may classify that presence as a permanent establishment, subjecting the company to Belgian corporate tax. Limiting employee presence and keeping detailed work-location records help mitigate this risk.
Do Belgian employment contracts need to be in writing?
For open-ended, full-time contracts, a written agreement is not strictly mandatory but is strongly recommended. Fixed-term, part-time, and temporary contracts must be in writing and signed before the employee begins work.
Get Expert Legal Guidance for Hiring in Belgium
Navigating Belgian employment law as a US company requires precision at every step, from permit applications to contract drafting and payroll setup. Tine Avocat is a Brussels-based employment law firm with over 13 years of experience advising companies on employment contracts, social compliance, professional immigration, and labour tribunal litigation. Contact our team today to schedule a consultation and ensure your Belgian hiring is legally sound from the start.