NIB
Published 6 November 2026, 09:07
NIB — Número de Identificação Bancária (bank account number)
The old 21-digit Portuguese account number. Today it is simply the last part of the IBAN: PT50 followed by the NIB gives you the 25-character Portuguese IBAN. The term lives on in forms, questionnaires and the tax portal menu.
Where you come across it. Forms from employers and public bodies, the tax portal option "Registo Contribuinte → Atividade → NIB/IBAN", old contracts.
If you are asked for a NIB, give your IBAN — it is the same thing. Your card number is no substitute.
Official website: clientebancario.bportugal.pt