NEN 4400-2 is the Dutch certification standard for staffing and sub-contracting agencies established outside the Netherlands that post workers or supply labour to Dutch hirers. It is the foreign counterpart of NEN 4400-1 and is administered by Stichting Normering Arbeid (SNA), which maintains the public register of certified firms.
The standard assesses whether a foreign agency correctly declares and remits Dutch wage tax, premiums, and VAT where applicable, verifies the identity and right-to-work of its posted workers, and maintains records that allow a Dutch hirer to discharge its chain-liability exposure. Audits are carried out twice a year by accredited inspection bodies.
For Dutch hirers, engaging an NEN 4400-2 certified foreign supplier is the practical way to satisfy the same due-diligence expectations that apply to domestic NEN 4400-1 suppliers, and it supports use of the G-account to mitigate inlenersaansprakelijkheid under the Wet ketenaansprakelijkheid.