Is Check in at Work the same as the Works declaration?

No. The Works declaration is made in advance, before the works start. Check in at Work is the daily registration of who is actually present. Both are needed.

Do I have to use the NSSO application itself?

No. Another system is allowed, as long as it offers equivalent guarantees. Our app forwards the registrations automatically using your own NSSO certificate.

What is the difference between Checkin@Work and CIAO?

Checkin@Work is the registration in construction, today only on arrival. CIAO (Check In and Out at Work) is the registration in cleaning, on arrival and departure.

Who is responsible for the registration?

The person carrying out the work registers themselves. The employer or client must inform their people and remains co-responsible, also for subcontractors and temporary workers.

What if a registration is rejected?

Then it has to be corrected. That is why we follow up every declaration until the final answer and show rejections at the top, instead of hiding them away.

Knowledge · Check in at Work

Check in at Work: the mandatory presence registration, simply arranged

Check in at Work is the mandatory registration of who is present on a construction site or work location. The NSSO uses it to counter social fraud. On this page you read what it involves, who it applies to and how to arrange it without extra administration.

checkinandoutatwork.be is an independent solution by Multi-Track and not a website of the NSSO. The official NSSO applications can be found on socialsecurity.be. socialsecurity.be

Book a demo See the Check in at Work app →

What is Check in at Work?

Checkin@Work in construction

Anyone working on a site registers their arrival.

Check In and Out at Work (CIAO) in cleaning

Anyone cleaning registers both arrival and departure at every work location.

In both cases the registration happens in real time, at the place where the work is done.

Who is it mandatory for?

Construction: on sites from € 500,000 (excluding VAT) the arrival is registered today. The NSSO is targeting 1 April 2027 to make departure mandatory as well; a Royal Decree still has to confirm that definitively.
Construction in detail
Cleaning (joint committee 121): since 1 September 2024 both arrival and departure are registered, regardless of company size or the value of the works.
Cleaning in detail
The obligation applies to your own employees, but also to subcontractors, self-employed workers and temporary workers. The employer or client remains co-responsible.

How do you register?

You may register via the NSSO application itself, or via another system offering equivalent guarantees, such as a registration device or an app. With an app the declaration happens automatically, using your own company's NSSO certificate.

Why an app makes it simpler

01
Check in and out with one tap
At the start of the activity the employee checks in via the app, and checks out the same way at the end — always with one tap, in their own language. A geofence confirms each time that they are at the declared work location.
02
Declaration within the deadline
Both the check-in and check-out are automatically sent to the NSSO within the legal deadline, signed with your own company's NSSO certificate.
03
Followed up until the answer
Every declaration — both check-in and check-out — is tracked until it is definitively accepted or rejected. You can read the outcome in plain language.

Sent is not the same as accepted. For every registration you see whether the NSSO definitively accepted or rejected it, so you can correct mistakes before an inspection.

See the Check in at Work app →

Frequently asked questions

Is Check in at Work the same as the Works declaration?: No. The Works declaration is made in advance, before the works start. Check in at Work is the daily registration of who is actually present. Both are needed.
Do I have to use the NSSO application itself?: No. Another system is allowed, as long as it offers equivalent guarantees. Our app forwards the registrations automatically using your own NSSO certificate.
What is the difference between Checkin@Work and CIAO?: Checkin@Work is the registration in construction, today only on arrival. CIAO (Check In and Out at Work) is the registration in cleaning, on arrival and departure.
Who is responsible for the registration?: The person carrying out the work registers themselves. The employer or client must inform their people and remains co-responsible, also for subcontractors and temporary workers.
What if a registration is rejected?: Then it has to be corrected. That is why we follow up every declaration until the final answer and show rejections at the top, instead of hiding them away.

Book a demo

See check-in and check-out live in a demo.

In a short session we walk through the three steps of the process: checking in and out with one tap in the app, the declaration within the deadline and the follow-up until the response. We then show the portal for managers: planning, registrations per team, reports and audit trail. For cleaning, construction or both — you choose where we put the emphasis.

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Disclaimer

This page contains general information, not legal advice. For your specific situation, please consult a lawyer or your social secretariat.

Last updated on 9 September 2026.