Everything you as a supplier need to know about the WTTA & SNA certification.
The WTTA is fundamentally changing the hiring chain: many suppliers are not yet prepared
As of 1 January 2027 the WTTA will come into effect. From that moment on, organizations that supply workers must have an official authorization. Many suppliers fall under this new regulation, sometimes without being aware of it. Those who fail to prepare in time risk losing assignments, suffering reputational damage, and facing enforcement measures from 2028 onward. Timely preparation is therefore necessary to safeguard contracts and business continuity.
Not prepared for WTTA? These are the consequences.
- Without a valid authorization, you will no longer be allowed to supply workers.
- Large clients will no longer be permitted to do business with you without a valid authorization.
- Contracts, supply chain agreements, and internal processes will need to be adjusted.
- The Labor Inspectorate will actively enforce the rules starting in 2028.
- You risk fines, sanctions, and reputational damage.
Who does the WTTA apply to?
Many organizations assume that the WTTA only applies to traditional staffing agencies. In reality, its scope is broader. Any organization that supplies workers – directly or indirectly – may fall under the law. This includes secondment agencies, freelance intermediaries, payroll constructions, or suppliers using alternative contract structures.
It is not your label that matters, but the actual structure of the employment relationship and the way work is managed. This is exactly where complexity arises. Many suppliers underestimate their role in the supply chain and therefore their authorization and SNA certification obligations.
Not sure whether your organization is affected? Make sure you understand what the WTTA and SNA certification specifically mean for you.
What is the WTTA?
From January 1, 2027, the WTTA will apply to all organizations that supply workers who operate under the direction and supervision of a third party.
The objective of the WTTA is clear: to protect workers from malpractice such as underpayment, poor housing, and unsafe working conditions, while also creating a level playing field for all market participants, including foreign companies. Only organizations that meet the strict standards will be allowed to continue supplying personnel.
Important for suppliers:
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Preparing in time is essential.
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Register in time via the reporting portal and arrange SNA certification, ZZP modules, and collective labor agreement (CLA) compliance.
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Review the full WTTA timeline to understand when to take which steps and avoid fines.
The Labour Supply Admission Act (WTTA) aligns with existing quality systems, such as the SNA certification (Stichting Normering Arbeid). However, the requirements do not fully overlap.
Many suppliers therefore wonder exactly what they need to adjust and what is already covered by their SNA certification. While SNA provides a solid foundation, the WTTA introduces additional requirements.
In our whitepaper, we explain where the differences lie and what organizations must do to be properly prepared.
By starting now, you avoid risks and protect your market position.
- Apply for your SNA certification, including ZZP modules.
- Document all supply chain agreements.
- Schedule a baseline assessment against WTTA standards.
Frequently asked questions about the WTTA & SNA certification