The WTTA: Stricter rules for employment agencies
- KVK Editors
- The basis
- Edited 29 January 2026
- 3 min
- Staff, Rules and laws
Do you have an employment agency? Or do you otherwise hire out people through your business? If so, new strict rules will apply from 2027. Read how to avoid fines.
The government wants tighter controls on employment agencies and other “lenders” of staff such as secondment agencies and payroll companies. Too often they do not comply with the rules or things go wrong. So, from 1 January 2027, the new law WTTA will apply.
What is the WTTA?
WTTA stands for Wet toelating terbeschikkingstelling van arbeidskrachten (Provision of Personnel Accreditation ). This act applies to temping agencies and other businesses that hire out workers. These businesses will have to follow strict rules, or they will not be allowed to hire out workers.
There are 2 situations in which the WTTA does not apply: secondment of colleagues within the same business or a group of companies.
When does the WTTA take effect?
The law applies from 1 January 2027. From that date, you may only hire out workers if your business is approved by the Nederlandse Autoriteit Uitleenmarkt (NAU, in Dutch). You must register before 1 January 2027. The NAU hires inspectors to check whether you comply with the rules for hiring out workers. If you do, you will be given access to the market. You will receive a certificate. Your business will also be listed in a public register, so customers can see that you are allowed to hire out workers.
What are the requirements for registration?
There are strict requirements to be included in the NAU register. Businesses must submit a Certificate of conduct for legal (VOG RP). This is a document that proves that your business has properly followed the rules in the past. If you have a sole proprietorship (eenmanszaak), you must submit a certificate of conduct for yourself as an individual (VOG ).
You must also prove that you follow existing laws and regulations. For instance, you must show that you pay the legal minimum wage to your employees. Under the WTTA, workers you hire out are entitled to earnings comparable to that of the hirer's permanent employees. This includes wages, allowances, bonuses, and fringe benefits. This is called 'Equal pay for equal work'.
Finally, as an employment agency, you must pay a deposit of €100,000. After 4 years of following the rules, you get this amount back. Can you prove that your business has already followed the rules for 4 years? Then you might not have to pay a deposit. For example, if the business has been registered with KVK for 4 years and you can show with a statement of payment (in Dutch) from the Netherlands Tax Administration that you have always paid the correct amount of tax on time.
When will the rules be enforced?
From 1 January 2028, the Netherlands Labour Authority will start enforcing the WTTA. The authority will check whether businesses that hire out personnel are actually listed in the NAU register. If your business is not in the register, you will be fined.
Because of the WTTA, businesses that hire temporary employees are only allowed to work with agencies that are listed in the NAU register.
Why is the WTTA needed?
For years, there have been major problems in the temporary employment sector. It happens too often that both employment agencies and the businesses that hire workers from them do not follow the rules. The problems particularly affect migrants who come to the Netherlands to work temporarily. They are often underpaid, work too many hours, or are forced to live in sub-standard accommodation. The government wants to prevent these poor conditions.
Until 2028: Submitting Waadi data to KVK
Do you run a temporary employment agency or do you supply staff to other businesses? If so, you will be subject to the rules of the Waadi. This law is designed to prevent the exploitation of temporary workers, such as coercion and violence. Your business may be fined if it fails to comply with the rules.
KVK is currently still responsible for maintaining Waadi data in the Business Register. To do this, you must fill in certain details on our forms. From 1 January 2028, this information will be transferred to the public Wtta register of the Netherlands Authority for the Labour Supply Market (Nederlandse Autoriteit Uitleenmarkt, NAU). After that date, you will no longer need to submit Waadi data to us. The Waadi check for hirers will also no longer be available on our website from 2028 onward.

