Office national de l'Emploi (ONEM / RVA) Edition 15.09.2023 (830.10.003) 2 pages

ONEM Form C1B — Déclaration de Revenus (Income Declaration)

The declaration that goes with your C1 when you have a pension, another benefit or unpaid leave alongside Belgian unemployment benefit.

Fill out ONEM C1B income declaration online View the form Free on every FileIt plan
ONEM C1B income declaration · Formulaire C1B — Déclaration de revenus (pension, indemnités, congé sans solde)
The official Office national de l'Emploi (ONEM / RVA) form, edition 15.09.2023 (830.10.003) — blank
Page 1 of 2
ONEM C1B income declaration (2023) Formulaire C1B — Déclaration de revenus (pension, indemnités, congé sans solde) — page 1 of 2
Page 1 of 2
ONEM C1B income declaration (2023) Formulaire C1B — Déclaration de revenus (pension, indemnités, congé sans solde) — page 2 of 2
Page 2 of 2
Fill this form online Blank PDF from Office national de l'Emploi (ONEM / RVA)

What is ONEM C1B income declaration?

If you claim or receive Belgian unemployment benefit, the National Employment Office (ONEM / RVA) needs to know about certain other income. The C1B declaration asks about a full retirement pension you are entitled to, pensions you receive, sickness or disability benefits from abroad, work-accident and occupational-disease benefits, and unpaid leave.

The unemployment office uses your answers to decide whether that income can be fully or partly combined with unemployment benefit, or not at all. The form explains that ONEM checks the answers against data from health insurance funds, insurers, the ONSS, the SPF Finances and other bodies.

FileIt walks you through the questions in English and follows the form's 'voir n' jumps, so you only see the questions that apply. It prints your NISS and dates one digit per box on the official PDF and keeps the declaration in your vault. FileIt never sends anything to ONEM or your payment body.

Issued by
Office national de l'Emploi (ONEM / RVA)
Hand it to
Your payment body (union or CAPAC), with the C1 and the annexes
Signature
The worker
Your duty
Report any change to your payment body within 7 days
Edition
15.09.2023
Pages
2

Who needs to fill out ONEM C1B income declaration?

  • Unemployed people entitled to a full retirement pension, whether or not they draw it.
  • Jobseekers receiving a Belgian or foreign retirement or survivor's pension.
  • People receiving a foreign sickness or disability benefit, or a Belgian or foreign work-accident or occupational-disease benefit.
  • Workers on unpaid leave who claim unemployment benefit.

When to use ONEM C1B income declaration

  • With your C1 when you claim unemployment benefit and have one of these incomes.
  • When your situation changes — you must tell your payment body within 7 days.

What you need before you start

  • Your NISS (national register number) and address.
  • Pension award decisions and the most recent payments.
  • For a Belgian survivor's pension you want to combine: a model 74 or 74bis or the Federal Pensions Service's pension declaration.
  • The net monthly amount of a foreign sickness or disability benefit.
  • Your employer's name and address and the dates of any unpaid leave.

What’s on ONEM C1B income declaration

The 2023 edition has 2 pages. FileIt asks for it in 6 parts, and it is signed by Worker (travailleur):

  1. Your detailsWorker (travailleur)
  2. Questions 1–4: a full retirement pensionWorker (travailleur)
  3. Questions 5–7: pensions you receiveWorker (travailleur)
  4. Questions 8–12: sickness, disability and work-accident benefitsWorker (travailleur)
  5. Questions 13–14: unpaid leaveWorker (travailleur)
  6. 15. Declaration and annexes (complétez toujours cette rubrique)Worker (travailleur)

How to fill out ONEM C1B income declaration, step by step

1 Your details

NISS, name and address.

2 Questions 1–4

Whether you are entitled to a full retirement pension, whether it is Belgian or foreign, its exact name and the date you are entitled to it.

3 Questions 5–7

The pensions you receive; for a Belgian survivor's pension, its start date, whether you want to combine it with unemployment benefit, and earlier periods when you combined it with other benefits.

4 Questions 8–12

Foreign sickness or disability benefit and its net monthly amount; Belgian and foreign work-accident or occupational-disease benefits.

5 Questions 13–15

Unpaid leave and its dates, then the declaration on your honour, the annexes you attach, the date and your signature.

Common mistakes to avoid

  • Answering only the pension questions — questions 8, 10, 12 and 13 are for everyone.
  • Giving the gross amount in question 9 instead of the net amount.
  • Forgetting the award decisions and payment copies the form asks for.
  • Not counting the annexes you attach.

After you fill it out

Print and sign the declaration.

Give it with the C1 and the annexes to your payment body, which sends them to the unemployment office.

Keep the copy FileIt saves in your vault. If your income can only partly be combined, or not at all, the unemployment office will invite you to answer further questions.

Fill out ONEM C1B income declaration online with FileIt

  1. Pick the person. Choose someone from People and FileIt fills in their name, date of birth, address and other details it already knows.
  2. Answer plain-language questions. One part of the form at a time, with the official help text beside each question — 46 fields in all. Your answers save as you go.
  3. Check the live preview. Watch your answers land on the real Office national de l'Emploi (ONEM / RVA) form, and let FileIt do any worksheet arithmetic.
  4. Generate the official PDF. FileIt prints your answers into the agency’s own PDF and files it in that person’s folder in your vault. Sign it, or send it for e-signature.

FileIt fills the form — it never files or submits anything for you. Deliver the finished form to whoever asked for it, the way the form’s instructions say.

Start ONEM C1B income declaration now — it’s free

ONEM C1B income declaration: frequently asked questions

Where do I hand it in?

To your payment body — your union or the CAPAC — together with the C1 and the annexes. The payment body passes them on to the unemployment office.

Do I have to declare a pension I don't draw?

Question 1 asks whether you are entitled to a full retirement pension, even if you don't draw it.

Will I be called in?

The form says that if your income can only partly be combined with unemployment benefit, or not at all, the office will invite you for questions. People with a foreign sickness or disability benefit, or a foreign work-accident benefit, are called to have their fitness for work checked by an ONEM doctor.

Can I sign it electronically?

The form doesn't ask for ink or a witness, so FileIt offers an electronic signature. Your payment body may ask for a signed paper copy.

Official sources

FileIt is not affiliated with or endorsed by Office national de l'Emploi (ONEM / RVA) or any government. This page explains the form in general terms and is not legal, tax or immigration advice. Always read the official instructions, and check that you are using the edition the recipient accepts. Page last reviewed 2026-10-25.

Fill out ONEM C1B income declaration online