The WTTA explained

The WTTA starts on 1 January 2027; from 1 January 2028 you can only hire staff from a licensed supplier. What does that mean for you? Hero explains.

Published on 21 August 2026Updated on 22 October 2026By Hero Interim Professionals

What does this mean for you?

The WTTA is the Dutch Admission Act for the Provision of Labour (Wet toelating terbeschikkingstelling van arbeidskrachten). From 1 January 2028, anyone who hires out staff needs an admission from the Dutch Labour Market Authority; the notification and registration obligations for each deployment already apply from 1 January 2027. The law plays out differently depending on your role: an application, a duty to check, or an assessment of each assignment.

Clients

From 1 January 2028, you may only hire staff through an admitted supplier
From 1 January 2027, you document in your own records, for each deployment, which worker is being made available to you by which supplier
Check the register for every deployment and at least every quarter, and keep the evidence
Stop working with them if they lose their admission; if you on-hire staff, this applies to you too

Salaried employees

Applies to secondment and opting-in
Hero applies for the admission and notifies the hirer of every deployment
You don’t need to apply for admission yourself
Your assignment simply continues

Freelancers (ZZP)

The law makes no exception for freelancers: the facts of each assignment decide
Do you do the work yourself and decide how? Then you probably don’t need admission
If the client directs you like an employee, the Dutch Labour Inspectorate may treat that as the provision of labour
The Dutch DBA Act also remains your framework

Providers of labour

You make an employee available to another company
You receive a fee in return
That employee works under their direction and supervision
All three true? Then you need admission from 1 January 2028

What changes and when?

1 Nov – 31 Dec 2026

Lenders register for the transitional scheme via toelatinguitleenmarkt.nl. This is a registration, not yet an authorisation.

1 Jan 2027

The WTTA takes effect. Lenders notify the hirer in writing before each deployment; hirers document in their own records, for each deployment, which worker is being made available by which lender. Hiring out staff is still allowed without authorisation.

1 May – 30 Jun 2027

The window to apply for authorisation. Anyone who signed up for the transitional scheme also applies during this period.

From 1 Jul 2027

The public register opens. You’ll be able to look up a lender yourself and check their status.

From 1 Jan 2028

Hiring out staff is only allowed with an authorisation, and hiring in only through an authorised lender. The Labour Inspectorate enforces the rules. The Waadi register is absorbed into the WTTA register.

How to vet a supplier.

As a hirer, you have two core obligations: only work with approved staffing providers and be able to prove it, and from 1 January 2027 document in your own records, for each deployment, which worker is being made available to you by which provider.

Gather the right detailsThe exact company name and Chamber of Commerce number, so you’re checking the right party.
Open the public WTTA registerFrom 1 July 2027, this is the official verification tool for hirers. Until then, ask your supplier for proof of registration for the transitional scheme or of a valid SNA quality mark.
Look up the supplierIf the name differs, verify that the legal entity matches.
Check both status and validityThe status should be “admitted”, or an exemption should apply, valid on the day of deployment.
Record it and schedule a recheckSave the date, the outcome and who carried out the check. Repeat the check for every new deployment or extension and at least every quarter, and turn on the register’s notifications.

Frequently asked questions about the WTTA.

Who is subject to the admission requirement, and who isn’t?

From 1 January 2028, anyone who supplies workers: temporary staffing agencies, secondment firms, payroll companies, foundations and intermediaries such as brokers and MSPs. It doesn’t matter whether it’s your main activity or a side activity. It doesn’t apply to contracting for work, to supplying staff within the same company, or between affiliated companies on a non-profit basis.

What already changes on 1 January 2027?

The system starts. Before each deployment begins, suppliers inform the hirer in writing that the worker concerned is being made available to them, and keep a record of this for seven years. Hirers document in their own records, no later than the day on which the provision of labour begins, which worker is being made available by which supplier, and keep that record for seven years. Suppliers apply for their admission between 1 May and 30 June 2027. The ban on hiring from non-admitted suppliers itself applies from 1 January 2028.

As a client, do I also fall under the WTTA?

Yes. From 1 January 2028, you may only hire from an admitted supplier and you have to be able to prove it: check the register for every deployment and periodically after that, and keep the evidence. From 1 January 2027, you also document in your own records, for each deployment, which worker is being made available by which supplier (to be kept for seven years), and you cooperate with the supervision of equal pay. If you on-hire staff, the same obligations apply to you.

Is an admission enough to comply with the Dutch DBA Act?

No, these are two separate regimes. The WTTA is about supplying employees, the DBA Act is about whether a self-employed professional is genuinely independent. Both can apply at the same time.

What happens if I hire from a non-admitted supplier?

From 1 January 2028, the Labour Inspectorate will enforce the ban on hiring from non-admitted suppliers. Hiring from a supplier without an admission can result in a fine for the supplier and for you as the hirer. If you on-hire staff, the ban applies to you too: the admission has to be in order at every link in the chain.

What happens to the Waadi register?

As of 1 January 2028, the Waadi register at the Chamber of Commerce will transfer to the WTTA register at the NAU. The Waadi registration requirement will be dropped. Registration in the Trade Register remains mandatory.

Is your question not among them? Ask the chat.

Where Hero stands

Hero holds the SNA quality mark. A supplier that holds a valid quality mark including the provision of labour module on 30 June 2027 can be admitted on a one-off basis without a separate inspection report. Hero will apply for admission during the application window from 1 May to 30 June 2027 inclusive.

Wondering what this means for your supply chain? We’re happy to think it through with you.

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The WTTA explained|