The principle — why the NSSO gets involved
In Belgium, the legal criterion that distinguishes an employee from a self-employed person is genuine autonomy in the performance of the work. If you are registered with the CBE/KBO and the NISSE (INASTI/RSVZ) but your daily routine looks like that of an employee — imposed hours, integration into a team, hierarchical reporting, exclusivity — the NSSO may consider that the chosen qualification does not match the economic reality.
Reclassification works in one direction only: the NSSO recovers 5 years of unpaid employer and personal contributions, plus interest and fines. The bill can reach tens of thousands of euros for the principal (the client).
NSSO inspection logic — Decisio.beThe legal framework — the 2006 law
The law of 27 December 2006 (the programme law known as the "law on the nature of employment relationships") sets the rules. It provides that the qualification chosen by the parties (freelance contract) prevails unless the concrete elements of the relationship demonstrate a performance incompatible with the autonomy of a self-employed worker.
The analysis rests on 4 general criteria and, for high-risk sectors (transport, construction, security, cleaning, agriculture, home teleworking, temporary agency work, certain IT activities), on sector-specific criteria.
Criterion 1 — The subordination link
This is criterion no. 1 and the most decisive. Do you receive precise instructions on how to carry out your work? Are you subject to hierarchical control beyond the normal control of the result owed by any service provider?
Criterion 2 — Freedom to organise working time
Do you freely decide your hours? Your days off? Your place of work (at least partially)? Do you have to clock in? Do you have to ask for permission to be absent?
A freelancer who must be present Monday to Friday from 9 a.m. to 5 p.m., who must "request leave" from the principal, and who has no leeway over the arrangement of their time, presents a very unfavourable set of indicators.
Criterion 3 — Freedom to organise the work
Do you freely choose the method, the tools, the processes you use? Can you subcontract part of your assignment? Can you refuse a task your client asks of you without breaking the contract?
Criterion 4 — The possibility of bearing an economic risk
A genuine self-employed person invests, takes risks, can gain or lose. If you invoice a fixed amount every month with no variability, no investment, no possibility of earning more by taking on more clients, the NSSO sees this as a strong indicator of employment.
A self-employed person who always invoices the same amount to the same single client, month after month, without invoicing a third party, without material investment, without significant professional expenses, structurally resembles an employee.
NSSO inspection logic — Decisio.be🎯 Wondering whether your status holds up?
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Criterion 5 — Exclusivity or near-exclusivity
A self-employed person who has only one client, or whose 90%+ of turnover comes from a single principal, and who has carried out this activity continuously for a long time, presents a very high risk of reclassification.
The key figures that inspectors monitor:
- More than 80% of turnover with a single client = strong signal
- More than 6–12 months of continuous service with this single client = aggravating factor
- Presence on the client's premises + equipment provided + imposed hours = near-certainty of reclassification
Having several active clients invoiced regularly remains the best protection. Even if one represents 70% of turnover, simply having others attests to a genuinely independent activity. Many IT freelancers start with a main client and then gradually diversify — that's the right reflex.
Criterion 6 — Integration into the principal's organisation
Are you integrated into a team? Do you appear in the organisation chart? Do you take part in internal meetings, team-building events, the company's ongoing training? Do you have a business card in the client's name? An email signature with the client's logo?
Criterion 7 — The absence of pay per service rendered
Are you paid on invoice, per service or per project? Or are you paid a fixed amount every month regardless of your actual activity? Do you receive supplements that resemble a 13th month, bonuses, or flat-rate expense reimbursements such as "mileage allowances" modelled on employee scales?
The more you invoice on a variable basis (according to hours, projects, deliverables), the closer you come to behaving as a self-employed person. The more your income stream is monthly, fixed, predictable and disconnected from the reality of the work performed, the closer you come to a disguised salary.
The consequences of a reclassification
Quick self-assessment — where do you stand?
Answer these 7 questions honestly. The more "yes" answers you have, the higher the risk:
0–1 yes: your self-employed status holds firmly. 2–3 yes: zone of vigilance, adjustments possible in the relationship. 4–5 yes: high risk, to be corrected urgently with the client. 6–7 yes: a typical false self-employment situation — a legal audit is recommended.
In summary — the key points
- The 2006 law allows the NSSO to reclassify a self-employed relationship as employment on the basis of 4 general criteria + sector-specific criteria
- Subordination link and near-exclusivity are the two most decisive indicators
- The NSSO can recover 5 years of retroactive contributions
- The principal is the most financially exposed (~30–38% in employer contributions)
- The reclassified self-employed person can recover retroactive employee status, but may also be held jointly liable for certain payments
- The best protection: several active clients, your own equipment, genuine autonomy, variable invoicing, independent visual identity
- If several risk criteria are ticked: renegotiate the relationship or consider a return to employee status