Before you start

For third-country nationals: an approved Flemish single permit, a professional card, or a hosting agreement with an approved research organisation, and a type D visa
For EU/EEA and Swiss nationals: no permit, but the same duty to register with the city
An address in Leuven with your name on the letterbox and the right doorbell
Legalised birth and marriage certificates — start these months before the move

Step-by-step

1
Establish which route your institution is actually using
An ordinary employment relationship goes through the Flemish single permit and its salary floors. A researcher hosted by an approved research organisation may instead be admitted on a hosting agreement under the EU researchers' directive, which turns on the research project and the institution's approval rather than on a salary threshold. Universities and research institutes handle both, and the paperwork, timeline and conditions differ. Ask your host explicitly rather than assuming the permit route.
Via employerWho: Your employer or host institutionBefore anything else
2
If it is a single permit, have your employer file with Flanders
The region is set by where the job is. Flanders' floors are annual: €48,912 gross for a highly skilled worker, €39,129.60 for under-30s on a local contract, €78,259 for management, and €63,586 for an EU Blue Card — the last set explicitly at 130% of the average gross annual salary. A Brussels template quotes monthly figures and will not survive a Flemish assessment; a Walloon one quotes higher figures still.
Via employerWho: Your employer4–5 months before the start date
3
Budget for the Flemish retribution as well as the federal contribution
The federal contribution is charged per file for highly-skilled, Blue Card and intra-corporate transfer applications. Flanders adds its own non-refundable €180 retribution on applications lodged from 1 September 2026 and does not begin processing until it has been paid. Brussels and Wallonia charge no equivalent.
Via employerWho: Your employer
4
Report to the city within eight working days of arriving
Go to the municipal counter for foreign nationals with passport, visa, permit or hosting agreement, and proof of address. You receive a Bijlage 15 — a paper slip, not an identity card, but for the next few weeks the only proof you are here lawfully.
In personWho: YouWithin 8 working days of arrival
5
Be findable for the wijkagent — and check the bell
The neighbourhood officer calls at the address unannounced to confirm you live there. In a city where a great many houses are divided into student rooms, the practical failure mode is not being absent but being unidentifiable: no name on the bell, a room number that matches nothing, and a landlord who is not on site. Fix that on day one.
In personWho: YouDays to a few weeks after registering
6
Collect your national register number and eID, then start inburgering if obliged
After a positive report the city registers you and invites you back for the electronic card; keep the PIN and PUK. Non-EU newcomers aged 18+ with a permit of more than three months must then follow the civic integration path — social orientation, Dutch, guidance towards work, diploma evaluation, 80% attendance — through the regional Agentschap Integratie en Inburgering. Budget €180 for social orientation classes and first test and €180 for Dutch.
In personWho: You2–8 weeks after the police check

Documents you’ll need

Passport with the type D visa
The approved Flemish single permit, professional card or hosting agreement
Registered lease or ownership title as proof of address — and it must be a main-residence lease, not a student lease
Legalised and translated birth certificate, and marriage certificate if applicable
Passport photographs to Belgian specification
Diploma, potentially with proof of authenticity under the 2026 Flemish rules

Things most newcomers don’t know

A student lease will not give you a registered main residence, and everything else depends on that.

Leuven's rental supply is dominated by kots, and the obvious solution to arriving in September with nowhere to live is to take one. But the studentenhuurovereenkomst is a distinct instrument under the Flemish decree, aimed at people whose main residence is their parents' address, and a landlord letting on those terms may well not accept you registering there. Without a registered address there is no wijkagent visit, no national register number, no eID, no bank account and no ziekenfonds. For a working newcomer this is the single most consequential housing decision, and it is invisible until the city counter refuses the file.

Source: Flemish Housing Rental Decree; community-reported

In a research city the first question is which admission route applies, not which salary floor.

The single permit and its Flemish thresholds govern ordinary employment. A researcher hosted by an approved research organisation may instead come in under the EU researchers' framework on a hosting agreement, which turns on the project and the institution rather than on a gross salary test — and the conditions, the timeline and what your family can do differ accordingly. In a city built around a university, a teaching hospital and a research institute, a great many arrivals are in this category and are given advice written for the other one.

Source: Immigration Office; Vlaanderen.be

The identical integration programme is free in Brussels and costs €360 in Flanders.

Since 1 September 2023 a newcomer signing a Flemish integration contract pays €180 for the social orientation classes including the first test, and €180 for the Dutch classes including the first test; failed retakes and course books cost more. Personal counselling, the pathway to work and the participation programme stay free. In Brussels the whole thing is free of charge — twenty-five minutes away on a train a great many Leuven residents take every day.

Source: Agentschap Integratie en Inburgering — costs of the civic integration programme

Flanders rewrote its labour migration rules on 1 January 2026, in a restrictive direction.

Roles at qualification levels 1 and 2 no longer qualify for economic migration at all; the mid-skilled shortage list was renamed and lost functions; a level 3–4 vacancy must now be published with VDAB for at least nine weeks with the employer cooperating in placement; the contract must carry specified details including the joint committee and function classification; and a regional retribution becomes payable during 2026. Anyone working from a 2024 or 2025 guide to Flemish permits is reading a superseded regime.

Source: Vlaanderen.be — new economic migration rules since 1 January 2026

Common mistakes to avoid

Taking a student kot as a working adult and finding you cannot register your address there.
Applying Brussels salary thresholds to a Leuven job, or Walloon ones.
Assuming the single permit route applies when your institution is using a hosting agreement, or the reverse.
Missing the eight-working-day window to report to the city after arrival.
Not putting your name on the correct bell in a house divided into rooms, and failing the wijkagent check.

Some of this may be out of date. Spotted something inaccurate? Help us keep it right for the next newcomer.