How do I declare my account to the Belgian National Bank?
Your Curvo account is held in the Netherlands. As such, you have to declare it as a foreign account with the National Bank of Belgium. Fortunately, it's an easy process! Follow the step-by-step guide below.
There are two ways to declare your foreign account to the Belgian National Bank:
Online
Through a paper form
The easiest way is to do it online and this is the one we'll focus on.
Declare your accounts by filling in the form available on the website of the National Bank of Belgium. If you go for the electronic route, remember that you'll either need your identity card (with chip!), your PIN code and a card reader or else access to your itsme account.
We'll use the French speaking form as an example.
Start with login into CSAM account using itsme:
Then select "contribuable" or "belastingbetaler":
Click on "Add new account":
Enter the account information. You must first find your account number.
To find your account ID, head on over to your Portfolio on the app, scroll down to the bottom and then click on "Settings". You'll see your account ID at the top.
Then fill in:
Nº du compte / Rekeningnummer: Your account ID
Dénomination / Benaming: Stichting Noordnederlandse Beleggersgiro
Pays / Land: The Netherlands
Période d'imposition / Tijdperk: 2025 (that is, the year you opened your account)
Rue / Straat: K.R. Poststraat 100-2
Code postal et localité / Postcode en plaats: 8841 ER Heerenveen
Pays / Land: The Netherlands
Insert your preferred language and validate
You're all set 🥳 and you can even download the PDF for your archives
Formally, you must declare your foreign account to the NBB before you file your tax declaration for the year. For example, if you started investing in November 2024, you'll want to declare your account before you file your taxes in 2025 for the year 2024.
But we send you the instructions a few weeks after you opened your account. This way, it's done and you don't have to think about it again.
No, you only need to declare your first portfolio to the National Bank. Any additional portfolios you open don't require a separate declaration.
Exception: If you close your first portfolio and later open a new one, you'll need to declare this new portfolio since it's considered your new "first" portfolio.
Sadly, the National Bank of Belgium won't let you view the foreign accounts you declared earlier. They explain this in their FAQ.
We hope they add this feature soon. It’s easy to forget if you've declared an account!
Unfortunately you do. Once your account is opened, you have to declare it to National Bank.
This information is provided for general educational purposes only and should not be considered personalised tax advice. While we strive to use reliable sources, we make no warranties regarding the accuracy or completeness of this content and assumes no liability for any damages resulting from its use or any inaccuracies or omissions.
Tax laws and regulations are subject to change, and individual circumstances vary significantly. Your specific tax situation may differ substantially from the scenarios presented. For personalised guidance tailored to your unique financial circumstances, please consult with a qualified tax professional or financial advisor.
Steps to declare your account (online method)
There are two ways to declare your foreign account to the Belgian National Bank:
Online
Through a paper form
The easiest way is to do it online and this is the one we'll focus on.
Declare your accounts by filling in the form available on the website of the National Bank of Belgium. If you go for the electronic route, remember that you'll either need your identity card (with chip!), your PIN code and a card reader or else access to your itsme account.
We'll use the French speaking form as an example.
Step 1
Start with login into CSAM account using itsme:
Step 2
Then select "contribuable" or "belastingbetaler":
Step 3
Click on "Add new account":
Step 4
Enter the account information. You must first find your account number.
To find your account ID, head on over to your Portfolio on the app, scroll down to the bottom and then click on "Settings". You'll see your account ID at the top.
Then fill in:
Nº du compte / Rekeningnummer: Your account ID
Dénomination / Benaming: Stichting Noordnederlandse Beleggersgiro
Pays / Land: The Netherlands
Période d'imposition / Tijdperk: 2025 (that is, the year you opened your account)
Rue / Straat: K.R. Poststraat 100-2
Code postal et localité / Postcode en plaats: 8841 ER Heerenveen
Pays / Land: The Netherlands
Step 5
Insert your preferred language and validate
Step 6
You're all set 🥳 and you can even download the PDF for your archives
Answers to your questions
When do I have to declare my foreign account?
Formally, you must declare your foreign account to the NBB before you file your tax declaration for the year. For example, if you started investing in November 2024, you'll want to declare your account before you file your taxes in 2025 for the year 2024.
But we send you the instructions a few weeks after you opened your account. This way, it's done and you don't have to think about it again.
Do I need to declare additional portfolios to the National Bank?
No, you only need to declare your first portfolio to the National Bank. Any additional portfolios you open don't require a separate declaration.
Exception: If you close your first portfolio and later open a new one, you'll need to declare this new portfolio since it's considered your new "first" portfolio.
I can't see my declared account on the National Bank website
Sadly, the National Bank of Belgium won't let you view the foreign accounts you declared earlier. They explain this in their FAQ.
We hope they add this feature soon. It’s easy to forget if you've declared an account!
Do I have to declare my account even if I haven't invested yet?
Unfortunately you do. Once your account is opened, you have to declare it to National Bank.
This information is provided for general educational purposes only and should not be considered personalised tax advice. While we strive to use reliable sources, we make no warranties regarding the accuracy or completeness of this content and assumes no liability for any damages resulting from its use or any inaccuracies or omissions.
Tax laws and regulations are subject to change, and individual circumstances vary significantly. Your specific tax situation may differ substantially from the scenarios presented. For personalised guidance tailored to your unique financial circumstances, please consult with a qualified tax professional or financial advisor.
Updated on: 26/05/2025
Thank you!