Why does Nickel need my National Register Number (RRN)? 

As a financial institution, we are legally required to verify the tax identity of our customers. According to our General Terms and Conditions, every Nickel customer must: 

• Have an official and permanent address in Belgium (a P.O. box is not valid). 
• Be a tax resident of an EU or EFTA country and comply with local tax obligations. 

You have 12 months from the opening of your account to provide us with your RRN.

Where can I find my National Register Number (RRN)? 

In Belgium, your tax identification number is identical to your National Register Number (RRN). This number consists of 11 digits, with the first 6 digits representing your date of birth (in the YYMMDD format). You can easily find this number:

• On the back or front (for newer cards) of your Belgian identity card (eID). 
• On the front of your Belgian residence permit.

How can I submit my RRN? 

You can submit your RRN quickly and securely via our website. Follow these steps: 

1. Go to the Nickel website. 
2. Click on “Contact us” at the bottom of our page. 
3. Click on the contact form. 
4. Under "Submit a request", choose the option: "Declare my RRN / proof of place of birth". 
5. In the subject of your request, mention “My RRN”. 
6. In the attachment, you can attach a clear photo or scan of your identity document. 
7. Submit your request. 

What happens if I do not provide my RRN on time? 

You have until exactly 1 year after opening your account to complete this. 

If we have not received your RRN after 12 months, we are legally required to temporarily block your account. 

You can only unblock and use your account again once we have received and processed your RRN.

Do you have any questions? 

Our customer service team is ready to help you! You can reach us Monday to Friday from 8:30 AM to 7:00 PM at 02 891 29 80 or via the contact form.