What the status means
- Required by law
- The law prescribes registered mail, sometimes as one of a short list of accepted methods. Another channel can make the letter invalid.
- Recommended
- No form is prescribed, but a deadline or the need to prove receipt makes registered mail the usual safe choice.
- Often required by contract
- The law sets no form. Contract terms often ask for registered mail, so check yours.
- Not needed
- Email, an online form or a cancellation button is valid and common. Registered mail adds little.
All letters at a glance
Housing and rent
Tenant's notice to end a lease
By region: Flanders and Brussels: no required form, registered mail is advised. Wallonia: registered mail, bailiff or hand delivery against a dated, signed copy is mandatory.
The notice period only runs once the landlord receives your notice in time, and you must be able to prove it. Registered mail gives you that proof and is mandatory in Wallonia.
- Deadline
- Usually three months' notice; a fee may be due for a short lease or during the first three years.
- Other valid ways
- In Flanders and Brussels any written form, including email; in Wallonia only registered mail, bailiff or hand delivery against a signed copy.
- Sources
- Vlaanderen.be, Het huurcontract eindigen of opzeggenBruxelles Logement, Brochure juridique bail d'habitation (janvier 2025)SPW Logement, Décret wallon du 15 mars 2018 relatif au bail d'habitationLegal basis: Vlaams Woninghuurdecreet (geen vormvereiste); art. 237 Code bruxellois du Logement; art. 30 décret wallon du 15 mars 2018
Landlord's notice to end a lease
By region: Flanders and Brussels: no required form, registered mail is advised; in Brussels the notice must be addressed to each tenant. Wallonia: registered mail, bailiff or hand delivery against a signed copy is mandatory.
Landlords must respect long notice periods, often state a reason, and prove the tenant received the notice in time. Registered mail or a bailiff is therefore the usual route.
- Deadline
- Usually six months before the end of a nine-year lease; three months for a short lease.
- Other valid ways
- In Flanders and Brussels any written form; in Wallonia only registered mail, bailiff or hand delivery against a signed copy.
- Sources
- Vlaanderen.be, Het huurcontract eindigen of opzeggenBruxelles Logement, Brochure juridique bail d'habitation (janvier 2025)SPW Logement, Décret wallon du 15 mars 2018 relatif au bail d'habitationLegal basis: Vlaams Woninghuurdecreet art. 17; art. 237 Code bruxellois du Logement; art. 30 en 55 décret wallon du 15 mars 2018
Request to extend a lease for exceptional circumstances
By region: Applies in all three regions, with small differences in the accepted delivery methods.
A tenant who cannot leave in time, for example due to illness or not finding a new home, can ask for more time. The law prescribes registered mail, otherwise the request is void.
- Deadline
- At the latest one month before the lease ends.
- Other valid ways
- In Flanders also by bailiff or hand delivery against a receipt; in Brussels and Wallonia only by registered mail.
- Sources
- Vlaanderen.be, Het huurcontract eindigen of opzeggenbe.brussels, Renon et congé (modèles)SPW Logement, Décret wallon du 15 mars 2018 relatif au bail d'habitationLegal basis: Vlaams Woninghuurdecreet art. 24; art. 250-251 Code bruxellois du Logement; art. 55 §6 décret wallon du 15 mars 2018
Read our guide: Request to extend a lease for exceptional circumstances
Reply to a rent indexation or increase
By region: In Wallonia a request to refund overpaid rent must be sent by registered mail; in Flanders the government advises it.
Indexation is not automatic: the landlord must request it in writing and back-dating is limited. If you dispute a calculation or reclaim overpaid rent, registered mail serves as proof.
- Deadline
- Indexation can be back-dated by at most three months; overpaid rent can be reclaimed for up to five years.
- Other valid ways
- An ordinary letter or email is valid; keep proof of sending.
- Sources
- Vlaanderen.be, Tijdens de huurovereenkomstbe.brussels, Indexation des loyersSPW Logement, Décret wallon du 15 mars 2018 relatif au bail d'habitationLegal basis: Vlaams Woninghuurdecreet art. 34; art. 224 Code bruxellois du Logement; art. 26-27 décret wallon du 15 mars 2018
Reclaiming the rental deposit
By region: Release rules differ slightly per region; the agreement-or-ruling principle applies everywhere.
The bank only releases the deposit on a signed agreement or a court ruling. If the landlord does not respond, a registered formal notice proves you asked in time, which helps before the justice of the peace.
- Deadline
- In Brussels the deposit must be returned within two months of leaving if the tenant met their obligations.
- Other valid ways
- Release needs a written agreement of both parties or a court ruling; an ordinary letter or email to ask for that agreement is enough.
- Sources
- Codex Vlaanderen, Vlaams Woninghuurdecreetbe.brussels, Garantie locativeSPW Logement, Décret wallon du 15 mars 2018 relatif au bail d'habitationLegal basis: Vlaams Woninghuurdecreet art. 37; art. 248 Code bruxellois du Logement; art. 62 décret wallon du 15 mars 2018
Notice of defects or repairs to the landlord
By region: The principle applies in all three regions; each region has its own list of tenant and landlord repairs.
Tenants must report repairs that are the landlord's job as soon as possible; reporting late can make them liable. A registered formal notice proves the report and comes before any case at the justice of the peace.
- Other valid ways
- A first report can be made by email or letter; registered mail is useful if the landlord does not respond.
- Sources
- Vlaanderen.be, Tijdens de huurovereenkomstVlaanderen.be, Het huurcontract eindigen of opzeggenBruxelles Logement, Brochure juridique bail d'habitation (janvier 2025)Legal basis: Vlaams Woninghuurdecreet; Code bruxellois du Logement; décret wallon du 15 mars 2018 (geen vormvereiste)
Request to renew a commercial lease
By region: The federal commercial lease law still applies in all three regions; Wallonia also has its own rules for short commercial leases.
A business tenant who wants to renew must ask within a strict window. The law requires registered mail or a bailiff, otherwise the right to renewal is lost.
- Deadline
- Between 18 and 15 months before the current lease ends.
- Other valid ways
- Also by bailiff's writ.
- Sources
- hub.brussels, Commercial lease: what do you need to considerL'économie en Wallonie, Me renseigner sur le bail commercialLegal basis: art. 14 Handelshuurwet (Burgerlijk Wetboek, boek III, titel VIII, hoofdstuk II, afdeling 2bis)
Work
Resignation by an employee with notice
The law allows only three ways to give notice, on pain of nullity. An email or text message is therefore not valid notice; the letter must also state the start and length of the notice period.
- Deadline
- A registered letter only takes effect on the third working day after sending; the notice period starts the following Monday.
- Other valid ways
- Also valid: handing the letter to the employer, who signs a copy as receipt, or a bailiff's writ.
- Sources
- FOD WASO, Einde van de overeenkomst voor onbepaalde tijd: ontslag door opzeggingSPF Emploi, Fin du contrat à durée indéterminée: licenciement moyennant préavisLegal basis: art. 37 §1 wet 3 juli 1978 betreffende de arbeidsovereenkomsten
Dismissal by the employer with notice
An employer may only give notice by registered letter or bailiff. Otherwise the notice is void and payment in lieu of notice is owed.
- Deadline
- A registered letter takes effect on the third working day after sending; the notice period starts the following Monday.
- Other valid ways
- Only by bailiff's writ; handing over a letter is not valid.
- Sources
- FOD WASO, Einde van de overeenkomst voor onbepaalde tijd: ontslag door opzeggingSPF Emploi, Fin du contrat à durée indéterminée: licenciement moyennant préavisLegal basis: art. 37 §1 wet 3 juli 1978 betreffende de arbeidsovereenkomsten
Insurance and subscriptions
Cancelling an insurance policy
The law lists the valid ways to cancel; a phone call or ordinary email is not enough. Since the 2024 reform, digital channels are accepted and your new insurer can cancel for you.
- Deadline
- At least two months before the renewal date; consumer non-life policies can be cancelled at any time after the first year with two months' notice.
- Other valid ways
- Also valid: bailiff, hand delivery against receipt, electronic registered delivery, the insurer's online environment with an electronic signature, or through your new insurer.
- Sources
- Wikifin (FSMA), Hoe verander je van verzekeraar?CMS, Naar een vereenvoudiging van de regels voor de beëindiging van verzekeringenLegal basis: art. 84-86 en 85/1 wet 4 april 2014 betreffende de verzekeringen (gewijzigd bij wet 9 oktober 2023)
Cancelling a telecom or internet subscription
When switching, the new operator handles the cancellation. After six months the operator may not charge cancellation fees, except for a bundled device.
- Other valid ways
- Through your new operator (Easy Switch or number porting), or through your current operator's customer service.
- Sources
- BIPT, Het contract opzeggenBIPT, Veranderen van vaste operatorLegal basis: wet 13 juni 2005 betreffende de elektronische communicatie (opzegging na zes maanden; Easy Switch)
Cancelling a gym or other subscription
The law sets no form; the contract decides how you cancel. After a first tacit renewal you can cancel free of charge, with at most two months' notice.
- Deadline
- After tacit renewal: notice period of at most two months.
- Other valid ways
- Follow the cancellation method in the contract; often a letter, email or form.
- Sources
- FOD Economie, Sportief in 2025? Ontdek 7 vragen over fitnesscentraLegal basis: boek VI Wetboek van economisch recht (stilzwijgende verlenging van overeenkomsten van bepaalde duur)
Cancelling an energy contract
Households and small businesses can cancel their energy contract at any time without fees. When switching, the new supplier does everything.
- Deadline
- Legal notice period of about one month.
- Other valid ways
- Sign with a new supplier; they handle the cancellation with the old one.
- Sources
- CREG, Soorten energiecontracten voor elektriciteit en aardgasLegal basis: wet 29 april 1999 (elektriciteit) en wet 12 april 1965 (gas), regels voor de bescherming van de consument
Money and debts
Payment reminder and formal notice of default
Towards consumers the first reminder is free and must allow at least fourteen days to pay. Interest and damages often only run after a formal notice, and registered mail proves it was received.
- Deadline
- At least fourteen calendar days to pay after the first reminder to a consumer.
- Other valid ways
- A first reminder to a consumer can be an ordinary letter or email; registered mail is customary for the formal notice of default.
- Sources
- FOD Economie, Onbetaalde facturen: gratis herinnering en beperkte vergoedingFOD Economie, Vijf vragen over facturen die iedereen zich steltLegal basis: art. XIX.2 Wetboek van economisch recht; boek 5 Burgerlijk Wetboek (ingebrekestelling)
Tax and fines
Objection to a tax assessment
By region: Regional and local taxes have other, often shorter deadlines (for example three months in Flanders).
An objection to personal income tax can be filed online or by letter. Registered mail is not needed; MyMinfin gives you immediate proof of filing.
- Deadline
- Within one year after the assessment notice was sent.
- Other valid ways
- Online through MyMinfin or by letter to the address on the assessment notice.
- Sources
- Wikifin (FSMA), Wat is de belangrijkste datum voor het indienen van je aangifte?Legal basis: art. 366-371 Wetboek van de inkomstenbelastingen 1992
Defence against a municipal administrative fine
By region: The details vary per municipality; check the local rules and the letter.
The finding is sent to you by registered mail and the time to respond is short. A registered defence proves you responded in time; an appeal against the decision then goes to the police court.
- Deadline
- Defence within fifteen days of receipt; appeal usually within one month of the decision.
- Other valid ways
- Many municipalities also accept email or an oral defence; check the letter from the sanctioning official.
- Sources
- Stad Gent, GAS 1-2-3 overlastHoven en rechtbanken, Ik ontving een administratieve sanctie: hoe stel ik beroep in?Legal basis: wet 24 juni 2013 betreffende de gemeentelijke administratieve sancties
Consumer purchases
Withdrawal within 14 days
For distance and off-premises purchases, any clear statement before the deadline is enough. Keep proof, such as the sent email or the acknowledgement.
- Deadline
- Fourteen days from the day after receiving the product or concluding the service contract.
- Other valid ways
- The withdrawal form, a clear statement by email or letter, or the seller's online function.
- Sources
- FOD Economie, Twijfel na een aankoop? Gebruik je herroepingsrechtFOD Economie, Verkoop op afstandLegal basis: art. VI.47-VI.49 Wetboek van economisch recht
Claim under the legal warranty
The law sets no form, but you must report the defect quickly and be able to show when you did. If the seller refuses, registered mail is strong proof.
- Deadline
- Two-year warranty; report the defect within two months of noticing it.
- Other valid ways
- Reporting in the shop, by email or by letter is valid; keep your proof of purchase.
- Sources
- FOD Economie, Wettelijke garantie: consument is beter beschermdFOD Economie, Garantie: je hebt meer rechten dan je denktLegal basis: art. 1649bis e.v. oud Burgerlijk Wetboek (wettelijke garantie, gewijzigd bij wet 20 maart 2022)
FAQ
Which letters must go by registered mail in Belgium?
A resignation or dismissal, cancelling an insurance policy, a tenant's request to extend a lease for exceptional reasons and a request to renew a commercial lease. For most of these the law also accepts other methods, such as a bailiff; a lease extension request can only go by registered mail in Brussels and Wallonia.
Do I have to give notice on a Belgian lease by registered mail?
It depends on the region. In Wallonia, registered mail, a bailiff or hand delivery against a dated, signed copy is mandatory. In Flanders and Brussels there is no required form, but registered mail is advised, because the notice period only runs once the landlord receives your notice.
Can I resign by email in Belgium?
No. The law allows only three ways: a registered letter, handing the letter to the employer who signs a copy, or a bailiff's writ. A registered letter only takes effect on the third working day after sending; the notice period starts the following Monday.
Can I cancel Belgian insurance online?
Yes. Since the 2024 reform, digital channels count, such as electronic registered delivery or the insurer's online environment with an electronic signature, and your new insurer can cancel for you. A phone call or ordinary email is not enough.
Do telecom or energy contracts need registered mail?
No. When you switch, the new operator or supplier handles the cancellation. Households can cancel an energy contract at any time without fees.
Sources and review
Each letter links to the official source it is based on: legislation, a government portal or a public authority. Practice and court rulings can change; check the source before you rely on a deadline. Sources checked on 28 October 2026.
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