Moving to Belgium: the first documents you will receive

After moving to Belgium, many newcomers need to register with the municipality, commune or gemeente where they live.

The municipality may ask for identity documents, proof of address, immigration documents and civil-status records. In some cases, a local police officer may verify that you actually live at the registered address.

Municipal registration is an important first step because it connects you to the population registers and many later administrative procedures.

After registration, you may receive a Belgian National Register number, known in Dutch as the rijksregisternummer and in French as the numéro de registre national.

This personal identification number is used by government bodies, healthcare funds, employers, tax authorities and many other organisations.

Check that the personal data connected with the number are correct and do not share the number without a legitimate reason.

The residence document you receive depends on your nationality, family situation, work or study status and the legal basis for your stay.

EU citizens and their family members may receive different registration certificates or residence cards from those issued to third-country nationals.

Check the document type, validity dates, address, employment conditions and any instructions for renewal or replacement.

Belgian compulsory health insurance is organised through recognised health-insurance funds, often called a mutualité in French or ziekenfonds in Dutch.

Depending on your situation, you may need to join a fund and provide evidence of employment, residence or other entitlement.

Health-insurance documents may concern registration, reimbursements, contributions, dependent family members or requests for additional information.

Employment paperwork may include an employment contract, work regulations, payroll statements, benefit documents and information about social-security contributions.

The contract should explain the employer, position, salary, working time, probation or notice arrangements where applicable and other important employment conditions.

Payslips may include gross salary, social-security deductions, withholding tax, benefits and net salary. Check that the amounts and working time match your agreement.

Belgium has a broad social-security system connected with employment, healthcare, pensions, unemployment, sickness and family support.

Employees are normally registered through their employer, while self-employed people follow different procedures.

If you receive a social-security letter, check which branch of the system it concerns, the period covered and whether the authority is asking for information, payment or confirmation.

Belgian residents may need to file an annual income-tax return. Tax obligations can depend on tax residence, family situation, employment and foreign income.

Employees usually have withholding tax deducted from salary during the year, but the annual return is used to determine the final tax position.

After processing the return, the tax authorities may issue an assessment showing the final calculation, refund or amount to be paid.

Belgian residents may use electronic identification tools such as the electronic identity card or the itsme app to access government and private online services.

These tools can be used for tax services, social-security portals, healthcare services and other official platforms.

Activation codes, authentication requests and security notifications should be treated carefully. Never approve a login or signature request you do not recognise.

Housing rules differ between the Belgian regions. Rental paperwork may include the lease, deposit documents, inventory report, utility contracts and correspondence from the landlord.

In many situations, residential rental agreements must be registered. Check who is responsible for registration and whether you receive confirmation.

Before signing, review the rent, charges, deposit, contract duration, notice rules and condition of the property.

Family-benefit systems are organised regionally in Belgium, so procedures depend on where the family lives.

Parents may receive letters about child benefits, birth-related payments, childcare support or requests for information about the household.

Check which child and benefit period the document concerns, the amount, required evidence and deadline for responding.

Education in Belgium is organised by the language communities, which means systems and school documents can differ between Dutch-speaking, French-speaking and German-speaking areas.

Families may receive enrolment forms, school calendars, attendance notices, meal or childcare documents, consent forms and payment requests.

A single school document can contain several important dates. Add enrolment appointments, holidays, parent meetings and return deadlines to your calendar separately.

Because Belgium has several levels of government, newcomers may receive documents from municipalities, regions, communities or federal authorities.

A letter may concern residence, waste charges, parking, housing, benefits, taxes or another local obligation.

Always identify which authority sent the document and whether it contains a payment, action or objection deadline.

Immigration, tax, benefits, employment and municipal documents can contain strict deadlines for submitting evidence, paying an amount, attending an appointment or challenging a decision.

Keep the original letter and record when it arrived. Save proof of every online submission, payment and postal response.

If the deadline affects residence status, employment, taxes, benefits or a significant amount of money, verify the requirements through the responsible authority or a qualified professional.