Do Belgium’s new rules for cross-border workers apply to you?

Start by checking the document on which you currently enter Belgium and prove your status. Annex 15 is a Belgian temporary certificate used in several immigration situations; one box identifies its holder as a cross-border worker. It should not be confused with the fiscal status sometimes called “frontier worker”, nor with an A1 social-security certificate.

If your Annex 15 records cross-border-worker status, take three practical steps. First, ask your employer or payroll department which Belgian region authorised your employment: Wallonia, Flanders, Brussels-Capital or the German-speaking Community. Economic migration is regionalised, so the workplace — not the language spoken at home — usually determines which employment authority handles the work side of the file. A job principally based in Arlon normally points to Wallonia; one in Brussels to Bruxelles Économie et Emploi or Brussel Economie en Werkgelegenheid; and one in Leuven to the Flemish economic-migration service.

Second, contact the Belgian Immigration Office, or Office des étrangers/Dienst Vreemdelingenzaken, about the document required under the new regime. Keep your passport, current residence permit from your country of residence, Annex 15, employment contract and Belgian work authorisation available. The federal notice confirms the transition but does not provide a single universal replacement checklist for every nationality and family status, so workers should not assume that a colleague’s solution automatically applies to them.

Third, keep written proof of any application and note the expiry dates of both your foreign residence permit and Belgian work authorisation. Employers should audit affected files rather than waiting until the end of the transition year. Regional authorities decide whether a third-country national may work, while the federal Immigration Office controls entry and stay; satisfying one side does not necessarily settle the other.

The Immigration Office has granted Annex 15 holders residing in these four neighbouring countries 12 months to bring their documentation into line with the new rules. That breathing space matters for workers commuting to employment centres such as Tournai, Mouscron, Arlon, Liège, Eupen, Hasselt and Antwerp. It also gives employers time to coordinate with the correct regional administration.

The federal announcement does not say that every current holder will receive the same replacement document, or that all cases will be converted automatically. Nationality, residence status in the neighbouring country, the duration and type of employment, and any family connection to an EU citizen can alter the legal route. Anyone whose Annex 15 or underlying residence permit expires sooner should use that earlier date as the practical deadline rather than relying blindly on the full 12 months.

Language can add friction. Walloon procedures and correspondence are generally in French, Flemish procedures in Dutch, and the German-speaking Community works in German. Brussels services operate in French and Dutch. The rules themselves do not impose a language test, but applicants should use the competent administration’s accepted language and request help from an employer, union or accredited adviser if they cannot understand a decision or request for evidence. A French commune or Dutch gemeente in the country of residence cannot replace the Belgian authority responsible for the work file.

The UK sits outside both the EU and the Schengen area. Belgium’s Immigration Office therefore advises cross-border workers resident there who have been relying on Annex 15 to apply promptly for a visa D through the Belgian Embassy in London. A visa D is the Belgian long-stay entry visa generally used when an authorised stay exceeds 90 days; the exact supporting documents depend on the underlying status.

British nationals protected as cross-border workers by the EU–UK Withdrawal Agreement are a distinct group and may hold a specific N card. They should not assume that the general Annex 15 warning cancels rights acquired before the end of the Brexit transition period. Conversely, simply living in Britain or holding a British residence permit does not create Withdrawal Agreement protection. The embassy or Immigration Office should confirm which route applies before travel.

This is not, on the evidence published so far, a wholesale rewrite of cross-border taxation, payroll or social security. Those questions remain governed by EU coordination rules, Belgian law and bilateral tax treaties. The federal social-security portal explains that a worker’s insurance position can depend on where the work is physically performed, while special arrangements may apply to habitual cross-border telework. France–Belgium tax treatment is another separate layer: the FPS Finance says the preserved frontier-tax regime is restricted to qualifying workers who already held it at the end of 2011 and is due to end in 2033.

That separation is important. Replacing or regularising an immigration document does not by itself determine where salary is taxed, whether an A1 certificate is needed, or how many home-working days are permitted. Workers changing their commuting or telework pattern should ask payroll or a cross-border tax adviser to review those issues independently.

Belgium says the old framework no longer reflects contemporary cross-border employment. That is credible: the rules date from an era before Schengen, EU citizenship, Brexit and routine hybrid work. Modernisation may ultimately produce clearer proof of status and better coordination between immigration and employment authorities. For workers and employers, however, the transition creates an administrative burden and a risk of inconsistent guidance while local desks adapt.

The next milestone is the end of the 12-month grace period for eligible Annex 15 holders in the four neighbouring EU countries. Before then, the Immigration Office and regional employment services will need to clarify the applicable document paths in individual cases. Until they do, the safest course is to verify status early, preserve written answers and treat immigration, work authorisation, tax and social security as four connected but legally separate files.