The admission obligation calls for a demonstrable, current file. This checklist lists all 18 checkpoints, from VOG and security deposit to partner admission. Go through them every quarter and you see in time what is still missing. You can read them below; to tick them off on paper, download the printable PDF.
Free download
The 18 checkpoints for your admission file in one PDF, with the Wtta dates from 2026 to 2028 — from VOG and security deposit to expiring documents. Written for Dutch staffing agencies.
What's inside
VOGs, KvK/SBI registration, security deposit and the standards framework (NEN 4400-1 / SNA).
IDs, permits, certificates, phase administration A/B/C and one monitored action list.
Demonstrable hours, hirer's remuneration, signed contracts and correct reservations.
SNF/PKS per location, partner-agency admission and your full lending chain mapped.
One owner for the file — and the real test: export everything within a day.
The checklist
Grouped in five parts, with the reason each point matters. Tick them off every quarter.
VOGs (certificates of conduct) for all directors are present and current.
An expired or missing Verklaring Omtrent het Gedrag is a direct gap in your admission file.
Chamber of Commerce (KvK) registration and SBI codes match your actual activities.
Placing workers must be clear from your registration (SBI 78201/78202/7830).
The security deposit is budgeted and reserved.
Include the deposit in your cash-flow planning in time, so it does not catch you out. Check the current amount and conditions at toelatinguitleenmarkt.nl.
You demonstrably meet the standards framework (incl. NEN 4400-1 / SNA system).
The admission system builds on existing certification — a valid SNA registration gives you a head start.
ID documents of all flex workers are valid and archived.
An expired ID stands out straight away at an inspection — monitor expiry dates automatically.
Residence and work permits are complete and current.
For migrant workers from outside the EU, a single missed expiry date can already amount to a violation.
Certificates (VCA, forklift, hygiene) are registered with their expiry date.
Demonstrable competence belongs in your file — and your client often asks for it too.
The phase administration (A/B/C) is correct for every flex worker.
A wrong phase means a wrong contract and possibly the wrong pay. Monitor transitions automatically.
There is one action list for everything that expires or is missing.
In loose folders and Excel sheets things slip through easily; one monitored list with deadlines keeps the overview.
Tip: Schedule a fixed quarterly moment (a "file check-up") to go through this list. If you check your file every quarter, you also stand stronger at an unannounced inspection.
Hours worked are demonstrable and traceable per client and per day.
Hours are the basis of pay and invoice — a watertight time registration is your first line of evidence.
The hirer's remuneration (inlenersbeloning) is recorded per client and current.
Pay in line with the hirer is a regular part of inspections.
Contracts and payslips are digital, signed and retrievable.
"We have it somewhere" does not count as demonstrable — an exportable file per flex worker does.
Reservations (holiday pay, holiday days) are visible per flex worker.
Incorrect reservations are a well-known finding in administrative checks.
Housing locations meet SNF/PKS and the registration per location is complete.
If you house migrant workers, the inspection looks at this too — keep a file per location.
The admission of partner agencies (onward lending) is actively monitored.
Working with a partner without admission becomes your problem too. Record the admission status per partner and check it in the public NAU register from 1 July 2027.
The whole chain (who lends to whom) is mapped.
Chain liability does not stop at your own contract — know who is in your chain.
One person is appointed as responsible for the admission file.
"Everyone a bit" means nobody in practice. Record who owns it.
You can export the complete file within one day.
The real test: if an inspector asks for your file today, can you hand it over right away, or will you be collecting for weeks?
Score: 18 of 18 ticked? Then you have the basics in order. Under 15? Start today: building a watertight file takes weeks, not days.
Rather tick them off on paper? Download the checklist as a printable PDF.
Download as printable PDFThis checklist is a practical aid, not legal advice. SimpleFlex is not a certifying body. The rules around the WTTA admission system can still change; check the current requirements with the NAU, your industry association (NBBU/ABU) or your adviser.
WTTA timeline
The Wtta (the Dutch act on admission for staffing agencies) comes in stages. These are the five dates that count for every staffing agency, as published by the NAU.
1 Nov – 31 Dec 2026
Register for the transition scheme.
1 January 2027
The Wtta enters into force and the transition year starts.
1 May – 30 June 2027
Submit your application for mandatory admission.
From 1 July 2027
The NAU assesses applications. Hirers can then check an agency's status in the public register.
From 1 January 2028
The Netherlands Labour Authority enforces the admission obligation.
Source: toelatinguitleenmarkt.nl (NAU) · Updated on . Dates can still change — always check the current timeline with the NAU.
The Wtta (Wet toelating terbeschikkingstelling van arbeidskrachten) introduces a mandatory admission system for staffing agencies in the Netherlands. Agencies must demonstrate with a current file that they meet the requirements, from VOG declarations to a security deposit. The act enters into force on 1 January 2027; you submit the application for admission between 1 May and 30 June 2027. The checklist walks you through every checkpoint.
Registering for the transition scheme is possible from 1 November to 31 December 2026. On 1 January 2027 the Wtta enters into force and the transition year starts. Between 1 May and 30 June 2027 you submit the application for mandatory admission. From 1 July 2027 the NAU assesses applications and hirers can check your status in the public register. From 1 January 2028 the Netherlands Labour Authority enforces the obligation. Source: toelatinguitleenmarkt.nl (NAU), updated on 22 September 2026.
Yes. All 18 checkpoints are on this page. If you want the printable PDF, you only leave your email address and receive it immediately, plus at most one follow-up email. No calls, no obligations.
Yes, for the parts that live in your planning and records: IDs, phases, housing and the admission status of your partner agencies. The compliance module warns you before documents expire and prepares those parts in one export. Things like your security deposit and your certification you arrange yourself — SimpleFlex is not a certifying body. See it in a free 30-minute demo.
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