Tax & VATRegulatory
Withholding duty on self-employed social debts (Belgium): 15%
From 30 October 2026, clients must withhold 15% (excl. VAT) when paying self-employed construction or cleaning contractors with social-contribution debts. What it means for the contractor and the client.
- Published
- Verified
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What matters now
- Effective date
- 30 October 2026, according to the RSVZ.
- Who
- Clients and main contractors paying self-employed contractors for construction, cleaning and related work on immovable property. Private individuals having work done for private use are exempt.
- Rate
- 15% of the amount excl. VAT, paid to the RSVZ. Together with tax and RSZ withholding, never more than 50%.
- Action today
- Contractors: pay, or agree a payment plan, before a registered letter's 15 days run out. Clients: check www.checkinhoudingsplicht.be before every payment.
Sources
- 01Programme Law of 22 December 2023, art. 65 and 66, Belgian Official Gazette 29.12.2023, numac 2023048600
- 02RSVZ: withholding duty and the social statute of the self-employed
- 03Check Inhoudingsplicht: withholding check service
- 04Royal Decree no. 38 of 27 July 1967, art. 15/1 and art. 17bis
- 05Law of 27 June 1969, art. 30bis; art. 403 WIB 92
From 30 October 2026, anyone in Belgium who pays a self-employed contractor for construction or cleaning work has to check whether that contractor owes social contributions. If so, 15% of the invoice excluding VAT is withheld and paid to the RSVZ instead.
The sector already has two withholding duties, one for tax debts and one for RSZ debts. The third is new and covers the self-employed person's own social contributions. It affects both parties to the invoice: the contractor, whose income drops, and the client, who has to check.
What changes on 30 October 2026?
From that date, a client paying a listed self-employed contractor for work in scope must keep back 15% of the amount excluding VAT and pay it to the RSVZ. The rule was written into law in December 2023, and the RSVZ confirms on its own page that it applies from 30 October 2026.
The scope is work on immovable property: construction, cleaning and related work. This is the same list of activities already used for the tax and RSZ withholding duties. The meat sector and guarding are not covered.
I'm self-employed with a debt at my social insurance fund: what now?
Before anyone is listed, the RSVZ sends a registered letter. If within 15 calendar days you neither pay nor agree a payment plan with your social insurance fund, you are entered in a public database that every client can consult.
What does not count:
- debts below €2,647, the RSVZ's threshold for 2026;
- contributions that are not yet due;
- debts under a payment plan that you are keeping to.
Once nothing is owed any more, you come off the list.
The RSVZ has begun sending notices. If you receive one, you have 15 days to act. Paying, or agreeing a plan, within that period keeps you out of the database. If you let it pass, your business clients have to withhold 15% from what they pay you.
What does it cost me if I'm listed?
15% of every invoice, calculated on the amount excluding VAT, goes to the RSVZ instead of to you.
| Invoice | Amount |
|---|---|
| Amount excluding VAT | €10,000 |
| Withheld and paid to the RSVZ (15%) | €1,500 |
| Reaches you, before VAT | €8,500 |
This applies to every invoice for as long as you are listed. Across a month of €40,000 in work, €6,000 never arrives in your account.
If you are also listed for tax or RSZ debts, the withholdings stack: 15% for tax, 35% for RSZ and 15% for the RSVZ. According to the RSVZ the total can never exceed 50%. On the same €10,000 invoice, that is up to €5,000 withheld.
I hire contractors: how do I check the withholding duty?
Before every payment, look up the contractor's enterprise number at www.checkinhoudingsplicht.be. The service tells you whether you have to withhold and gives you the structured reference to use when you pay the withheld amount.
Check again before each payment, even for a contractor you have checked before. A contractor who was clear when you signed the quote can be listed by the time the final invoice comes in, and the other way round.
The duty applies to you whether you are the end client or a main contractor paying a subcontractor.
How much do I have to withhold?
15% of the amount due, excluding VAT. On an invoice of €10,000 excluding VAT, €1,500 goes to the RSVZ with the structured reference from the check, and the contractor is paid the rest. VAT is not part of the calculation.
If you should have withheld and did not, the RSVZ states that the fine is 15% of the invoice amount, capped at €10,578.23.
Who is exempt?
A private individual who has the work done purely for private purposes is exempt. Someone renovating their own home has nothing to check or withhold. A company, a self-employed client or a main contractor does have to check.
What to do this month
- If you are the contractor, find out whether you owe more than €2,647 in social contributions that are already due. If you do, pay it or agree a plan with your social insurance fund now, before a letter sets the timing for you. Open every registered letter from the RSVZ the day it arrives.
- If you hire contractors, put the check into your payment routine, one check per payment, and keep the dated result with the invoice.
From 30 October 2026, art. 15/1 of Royal Decree no. 38 adds a third withholding duty to construction and cleaning: 15% of the amount excluding VAT, paid to the RSVZ, when the self-employed contractor is listed for social-contribution debts.
What is the legal basis?
The Programme Law of 22 December 2023, Belgian Official Gazette of 29 December 2023, numac 2023048600:
- art. 65 inserts art. 15/1 into Royal Decree no. 38 of 27 July 1967 organising the social statute of the self-employed;
- art. 66 adds the fine as art. 17bis.
The original start date was moved. The RSVZ's own page states that the duty applies from 30 October 2026, and that is the date to work from.
Which works are in scope?
Works referred to in art. 30bis, §1, 1°, a) of the Law of 27 June 1969: work on immovable property, meaning construction, cleaning and related works. It is the same list that the existing tax and RSZ withholding duties use. The meat sector and guarding are not in scope.
The King may extend the duty to other sectors, so the list above is the current scope. Re-read it when an extension is published.
Who must withhold, and from whom?
The client withholds, and so does a contractor paying a subcontractor. The duty applies to payments to a self-employed contractor who is listed for social-contribution debts at the time of payment. A client who is a natural person having the works done exclusively for private purposes is exempt.
The amount is 15% of the amount due, excluding VAT, paid to the RSVZ with the structured reference shown by www.checkinhoudingsplicht.be.
How does it sit next to the tax and RSZ withholding?
| Debt | Basis | Rate |
|---|---|---|
| Tax | art. 403 WIB 92 | 15% |
| RSZ | art. 30bis, Law of 27 June 1969 | 35% |
| Self-employed social contributions | art. 15/1 KB no. 38 | 15% |
According to the RSVZ, the total withheld across the three schemes can never exceed 50%. A contractor listed under all three on a €10,000 excl. VAT invoice loses at most €5,000 of it to withholding.
When is a contractor listed, and when not?
The RSVZ sends a registered letter. If within 15 calendar days the self-employed person neither pays nor agrees a payment plan with their social insurance fund, they are entered in the public database. They are removed once no debts remain.
Not counted:
- debts below the threshold, €2,647 for 2026 according to the RSVZ;
- debts that are not yet due;
- debts under a payment plan that is being respected.
The RSVZ has begun sending notices. For self-employed clients in construction or cleaning, the useful work happens before the letter. A client in arrears above the threshold should be paying or on a plan already, and a client on a plan should be kept to it, because a broken plan puts the debt back in count.
What happens if the client does not withhold?
According to the RSVZ, a fine of 15% of the invoice amount, capped at €10,578.23.
What belongs in the client file?
For clients who hire contractors in scope:
- One check per payment rather than one per contractor, since the status can change between quote and final invoice.
- The dated result of each check (screenshot or saved result), with the enterprise number, filed against the invoice it covers.
- Where withholding applied: proof of the payment to the RSVZ with the structured reference, next to the reduced payment to the contractor.
- Where the client claims the private-purposes exemption: a note of why it applies. It covers natural persons only.
For self-employed clients in the sector:
- The date any registered letter from the RSVZ was received, and the date 15 calendar days later.
- The payment plan agreed with the social insurance fund and evidence it is being kept.
- If listed: expect each payment to arrive 15% of the excl.-VAT amount short, and collect the customer's proof of what was paid to the RSVZ.
Dokus keeps each invoice, its date and what was actually paid against it in one place. Both sides need that record once 15% starts going to the RSVZ.
See Dokus