Detachering is a form of personnel provision in which a specialised provider (the detacheringsbureau or detachering BV) employs a professional and seconds them to a client organisation for a defined project or role. Unlike agency work, the assignments are typically longer, more specialised, and focused on knowledge-intensive sectors such as IT, engineering, finance, and government.
Legally, detachering falls under Article 7:690 of the Civil Code as a form of terbeschikkingstelling van arbeidskrachten, and therefore shares the regulatory regime that governs agency work. The professional signs an employment contract with the detachering provider, while the client signs a commercial service agreement with that provider. The inlenersbeloning rule requires equal pay and conditions compared to a directly employed counterpart at the client.
From 2026, the Wet toelating terbeschikkingstelling van arbeidskrachten (Wtta) requires all detachering providers to hold a mandatory licence issued by a government-approved body. Clients hiring from unlicensed providers face administrative fines and joint liability for unpaid wages and taxes.