Check the SNA register
Check an SNA listing on the official SNA register . Search by KvK number where possible, because trade names and holding companies can look alike. Then look at the activity that was inspected and download the current declaration. The FAQ on the SNA website explains why a pending application is not yet a certificate.
This check suits a labour user, client or contractor who is selecting a supplier. A register listing is a snapshot in time, not a full supplier audit. Also check the contract, identity, right to work, and how you record payments and hours yourself. For a future legal check, read Wtta and SNA.
Use the cluster hub for the context of NEN 4400 and SNA. For contract and file checks, the requirements checklist is a logical next step.
Last checked: 5 September 2026.
Check in five steps
1. Note the legal entity
Ask the supplier for the legal name, KvK number or foreign registration number, and address. Also record which trade name is used. Do not search on the trade name alone.
2. Search by KvK number
Open the SNA register and enter the number. Check that the legal entity you find matches the contracting party exactly. For a holding company or sister company, a similar name may belong to a different entity.
3. Read the current status
Check whether the company is listed as a certified company in the register. According to SNA, a listing under pending applications only means the company wants to be inspected. It is not yet certified.
4. Check the activity
The register shows which activities have been inspected, such as making labour available, contracting work, intermediation or intermediary contracting. Make sure the activity matches your contract and your practice. Onward hiring (doorlenen) can be a separate chain.
5. Download and save the declaration
Download the declaration of registration on the day you check, and note the date, KvK number, activity and URL. Repeat the check regularly, and use the free notification service if you want to receive changes by email. For what the declaration says, read NEN 4400 declaration. For how to request the document from a supplier, see request an NEN 4400 certificate.
A fictional example
A client wants to hire staff from “WerkPlus”. The quote names WerkPlus Holding B.V., but the contract names WerkPlus Personeel B.V. The client asks for both KvK numbers and finds only the second entity listed as certified for making labour available. The client records the check, asks for an explanation of the contract name, and has the correct company sign. This example says nothing about real companies.
What does an SNA listing say, and what does it not say?
The register shows that SNA currently lists the company as certified, and which activities have been inspected. A company can later be suspended or removed. According to SNA, the declaration has no fixed period of validity. The current status in the register is what counts.
An SNA listing does not prove that every employee has been checked correctly. It does not show that a contract qualifies legally as making staff available, or that you meet all the conditions for tax indemnity. Check identity, right to work and payments through your own process. The requirements checklist helps you organise the evidence.
Treat “pending application” as not certified. SNA states clearly that only a listing as a certified company in the register confirms the certificate.
Frequently asked questions
How often should I check the register?
SNA does not set a general checking frequency for labour users on this page. Choose an interval that fits the risk and the length of the contract, and use the notification service for status changes.
Is an old declaration still enough?
Check the register again and save a current download. The current register listing matters more than a loose, old PDF.
Is the right activity enough for every contract?
No. The activity in the register must match the actual service. If in doubt, ask the supplier and the inspection body for an explanation.