On any document issued by CRPN, either in the bottom right-hand corner or in the top left-hand corner, depending on the type of document (career statement, notice of entitlement, pension statements, letters, etc.), preceded by “T” or “N° de tiers”.
In your personal account, if you’re an employee, you’ll find it at the bottom right of your career statement or notification of entitlements, for example. If you’re a pensioner, you’ll find it at the bottom right of your pension statements or tax certificates, for example.