Belgium’s contractor market runs on the self-employed status: a zelfstandige (Dutch) or indépendant (French) registers in the Crossroads Bank for Enterprises (KBO/BCE), joins a social insurance fund and pays social contributions every quarter. Some contractors work through a BV/SRL company instead. Payment is simple, euros over SEPA with no currency control. The questions that matter to a foreign client are classification under the 2006 law on the nature of employment relationships and a written IP assignment. This guide covers the contractor set-up, contributions, classification and the contract; the payment side is on our Belgium payouts page. It is general information, not legal advice.
Zelfstandige or BV/SRL
A zelfstandige trades in their own name as a sole trader. You contract with the individual, who is personally liable for business debts and pays income tax at progressive rates of 25%, 40%, 45% and 50%, the top rate applying from €49,840 for income year 2025, plus a communal surcharge of 0% to 9%, about 7% on average (PwC Tax Summaries, reviewed 2026-09-10).
A BV (besloten vennootschap) or SRL (société à responsabilité limitée) is a private limited company. Since the 2019 Code of Companies and Associations it has no capital: the founders must give it starting equity sufficient for the planned activity and hand the notary a financial plan covering at least two years, and they can be held liable if the equity proves manifestly insufficient (barreaudeliege-huy.be, checked 2026-09-29). With a BV/SRL you contract with the company, and the invoice, VAT number and bank account are the company’s.
Self-employment can also be a side activity next to a salaried job. It changes the contractor’s contributions, not your paperwork.
KBO/BCE registration and the social insurance fund
A sole trader registers through an approved enterprise counter (ondernemingsloket / guichet d’entreprises), which enters the business in the KBO/BCE. The fee is €111.50 per establishment unit in 2026 and carries no VAT (UCM tariff 2026, checked 2026-09-29). The resulting 10-digit enterprise number is also the VAT number, preceded by “BE” (liantis.be, checked 2026-09-29). You can check it in the public KBO search before signing.
The contractor must also join a social insurance fund (sociaal verzekeringsfonds / caisse d’assurances sociales) before the activity starts. Late affiliation brings surcharges and an administrative fine (inasti.be, checked 2026-09-29).
VAT. The standard rate is 21% (PwC Tax Summaries, reviewed 2026-09-10). A contractor with turnover up to €25,000 can use the small-business franchise and charge no VAT (finances.belgium.be, checked 2026-09-29). Services to a business abroad are taxed where the customer is established (VAT Code, Article 21 §2); an EU client’s invoice carries “Autoliquidation : article 21 § 2 du Code belge de la TVA” (liantis.be, checked 2026-09-29). Since 1 January 2026 B2B invoices between Belgian VAT payers go over Peppol, franchise businesses included (efacture.belgium.be, checked 2026-09-29); foreign taxpayers holding only a Belgian VAT number are excluded as customers (European Commission, checked 2026-09-29).
Quarterly social contributions
Contributions are a percentage of net professional income, collected by the fund each quarter (inasti.be, checked 2026-09-29; minimums and management fee from the Partena 2026 scale, checked 2026-09-29):
| 2026 | Main activity | Side activity |
|---|---|---|
| Rate up to €75,024.54 of net income | 20.5% | 20.5% |
| Rate from €75,024.54 to €110,562.42 | 14.16% | 14.16% |
| Above €110,562.42 | none | none |
| Minimum per quarter | €927.82 (€479.13 for a first-time starter on low income, first four quarters) | none below €1,922.16 of annual income |
The quarterly amounts are provisional. For an established contractor, 2026 contributions are based on 2023 income and regularised once the tax office reports actual 2026 income, probably at the end of 2027 or early 2028; a starter pays on an estimate or the legal minimum. Funds add a management fee, 4.20% of contributions at Partena. None of this passes through the client: you pay the invoice gross.
The 2006 law and the employment test
Belgium has a statute for this question: Title XIII of the Programme Law of 27 December 2006 on the nature of employment relationships. It weighs four general criteria (commissionrelationstravail.belgium.be, checked 2026-09-29):
- the parties’ will as expressed in their agreement, provided the relationship is carried out that way;
- freedom to organise the work;
- freedom to organise working time;
- the possibility of exercising hierarchical control.
Presumptions. In construction, security, transport, cleaning, agriculture and horticulture, a list of nine socio-economic criteria applies: if more than half are met, the relationship is presumed to be employment. Platform work has its own presumption since 1 January 2023 (emploi.belgique.be, checked 2026-09-29). Software, design and consulting sit outside those sectors, so for most remote contractors the four general criteria decide.
Rulings. Either party can ask the Commission on work relationships (Commission administrative de règlement de la relation de travail) for a decision before the relationship starts, within a year of its start, or within a year of a significant change. It decides within three months, and the decision binds unless the working conditions change or the information given was incomplete or wrong (procedure, checked 2026-09-29).
What reclassification costs. The ONSS can claim contributions for the three previous years, seven in case of fraud. The client pays both the employer and the employee share, plus a single 10% surcharge and late-payment interest, and cannot recover the employee share from the worker (xerius.be, checked 2026-09-29). The markers that hurt are the usual ones: one client, fixed hours you set, your tools, and a manager who approves the contractor’s days off. See contractor misclassification.
Contract and IP
- A written services agreement naming the contractor’s enterprise number (or the BV/SRL), deliverables, rate, currency and payment terms.
- Independence markers that match reality: the contractor’s own schedule and tools, freedom to work for other clients, and pricing per deliverable where possible. Under the 2006 law the written agreement counts only if daily practice follows it.
- IP assignment in writing, listed use by use. Under Article XI.167 of the Code of Economic Law, copyright contracts are proven in writing and interpreted strictly; for each mode of exploitation the scope, duration and author’s remuneration should be set out (Code of Economic Law, checked 2026-09-29). The presumption in Article XI.296 that the employer owns software covers programs written by employees, not by a contractor or a company manager (fredericlejeune.be, checked 2026-09-29). Name the rights you need, including source code and pre-existing materials.
Taxes and paperwork on the client’s side
Pay gross against invoices; a foreign client has no Belgian withholding for a genuine contractor. US payers collect a W-8BEN (W-8BEN-E for a BV/SRL) and file no 1099: work done in Belgium is foreign-source income, exempt from NRA withholding (irs.gov, checked 2026-09-29). The US–Belgium treaty was signed on 27 November 2006 and entered into force on 28 December 2007 (treasury.gov, checked 2026-09-29); it has no separate independent-services article, so a contractor’s fees are business profits under Article 7, taxable in the US only through a permanent establishment there (IRS technical explanation, checked 2026-09-29). EU payers check the VAT number in VIES. Keep the contract, the KBO extract, invoices and proof of payment.
Contractor of Record in Belgium
For long, single-client or full-time engagements, a Contractor of Record puts a contracting party between you and the contractor. 4dev acts as Contractor of Record — the contracting party for each contractor — which reduces reclassification risk. Other providers in our COR rating offer the same model; read the liability clause in the COR contract rather than the product name. A ruling from the Commission on work relationships is a separate route and can sit alongside either set-up. If the role is a job in substance, with your hours, your tools and core work, hire through an EOR instead.
How to pay contractors in Belgium
Pay EUR by SEPA or SEPA Instant to the IBAN in the name on the invoice. Belgian banks check the payee name against the IBAN and warn on a mismatch; a common cause is a BV/SRL invoice paid to the manager’s personal account, or the reverse (febelfin.be, checked 2026-09-29). Paying from dollars, convert before sending: a USD wire costs the contractor a receiving fee and a conversion margin at their bank. Rails, fees and a ranked list of platforms are on our page how to pay contractors in Belgium.