NSSO portal — practical guide
Checkinatwork login
Looking for where to sign in to register attendance? That happens on the social security portal of the Belgian National Social Security Office (NSSO, known locally as RSZ/ONSS) — not with us. Below you will find exactly where to go, what to sort out first if it doesn't work, and what changes from 2027 in the way you have to register.
How to sign in
1. Go to the social security portal
Checkinatwork is an online service of the NSSO on socialsecurity.be, under the services for employers. There is no separate 'checkinatwork.be'.
2. Click Log in
You identify yourself with your electronic identity card (eID with a card reader), with itsme or with a security code from a mobile app.
3. Choose your company
If you work for several companies, after signing in you choose in which capacity you want to continue.
4. Open Checkinatwork
Can't see the service? Then you don't have access yet — see below. Do you have access? Then choose the site and register who is present.
Can't sign in? It's usually this
Anyone trying to sign in for the first time almost always runs into the same thing: your identification works, but the service doesn't show up. That is not a fault — it is your company's access management:
- Your company does not have a main access manager yet. That person first has to activate the company account; to do so, they sign in once themselves with eID or itsme.
- You have not been given access to this online service yet. The main access manager grants it to the staff who need to work with it.
- You are a foreign company or a foreign self-employed worker. The application then works differently; the NSSO refers you to the international portal for this.
In short: the problem rarely lies with Checkinatwork itself, but with the access rights your company has on the portal.
What do you need to register an attendance?
Once signed in, you need three things per registration: the site number (which comes from the declaration of works), the identity of the person (national register number, eID or Limosa number) and the date. After a successful registration you get a receipt number back — your proof in an inspection.
Four ways to register
The NSSO provides several channels. Which one you choose mainly determines how much work it costs you every day:
Online, on a computer
Enter attendance manually, or with a wizard that pulls the data from Dimona and the declaration of works. It works, but someone has to do it every day.
Online, on a smartphone
The same service in a mobile version, with the option to scan the QR code of a Limosa document.
Gateway on site
A computer with a card reader at the site entrance. The worker identifies themselves with their eID, national register number or Limosa number.
Web service (connected system)
Your software sends the registrations through directly. This is the route AutoCheckIn takes: your people are registered automatically and nobody has to sign in any more.
From 2027, signing in is no longer enough
Today you can sign in in the morning and enter your crew for the day. From 1 April 2027 that is no longer allowed: every worker has to register themselves, on site, at the moment itself — on arrival and on departure. Anyone who does everything manually through the portal today will have to find another way regardless.
Frequently asked questions about signing in
Where do you sign in to Checkinatwork?
On the Belgian social security portal (socialsecurity.be), under the online services for employers. You click 'Log in' and identify yourself with your eID, itsme or a code from a mobile app. Checkinatwork is a secure online service: without signing in, you cannot register any attendance.
What do I need to sign in?
A digital identity (eID with a card reader, itsme or an app with a security code) and access to the online service within your company. That access is granted by your company's main access manager; if there isn't one yet, one has to be appointed first.
Why can't I sign in?
In the vast majority of cases, the problem is not the identification itself but the access: your company does not have a main access manager yet, or you have not been given the role for this online service. You sort that out in the access management on the portal, not in Checkinatwork itself.
Do I have to sign in again every day to register attendance?
With manual registration through the portal, yes: you sign in, choose the site and register who is present. With a connected system, registration happens automatically and you no longer have to sign in yourself to submit attendance.
What is a receipt number?
After a successful registration you receive a receipt number. That is your proof that the attendance has actually been registered with the NSSO. Keep it — in an inspection, that is what counts.
Does signing in change in 2027?
Yes. From 1 April 2027, every worker has to register themselves, in real time on site, on arrival and on departure. Entering attendance in advance from the office will no longer be possible. In practice that means: not one person who signs in in the morning, but a system that works on the site itself.
Read more
- What is Checkinatwork (CIAW)?
- From what amount is Checkinatwork mandatory?
- Declaration of works or Checkinatwork: what's the difference?
- Adding a subcontractor to Checkinatwork
This page is general information, not legal advice, and AutoCheckIn is not affiliated with the NSSO. The official and current procedure can be found on socialsecurity.be.