Change Password Portal das Finanças — Step-by-Step Guide

Once you have your NIF password and have logged in to Portal das Finanças, you can change it at any time. Reasons to change: the password is hard to remember, you suspect it is compromised, or you want a stronger password than the one issued by Autoridade Tributária. This guide walks through the change password process step by step and covers the Chave Móvel Digital (Digital Mobile Key, CMD) as an alternative login method.

Step-by-step: change your Portal das Finanças password

Here is how to change your Finanças password in four steps:

1. Log in to Portal das Finanças. Go to portaldasfinancas.gov.pt and click “Iniciar Sessão”. Enter your NIF and current password. If you have lost access, see how to receive your NIF password.
2. Open password settings. In the search bar, type “Alterar Senha” and click “Aceder”. Or navigate manually: Cidadãos > Serviços > Autenticação de Contribuintes > Alterar Dados de Acesso.
3. Enter old and new password. Enter your current password, then your new password twice. The new password must meet AT requirements (see the table below).
4. Confirm the change. Click “Alterar”. A confirmation message appears. From now on, log in with your new password — the old one no longer works.

Digital Mobile Key Portugal (Chave Móvel Digital, CMD) — alternative login

Instead of using a password to log in to Portal das Finanças, Portuguese residents and citizens can use the Chave Móvel Digital — a government-issued digital identity tied to a Portuguese mobile number. CMD works as a second authentication factor or as your primary login method.

To use CMD on Portal das Finanças:

• Go to autenticacao.gov.pt and register your CMD with your mobile number and Cartão de Cidadão.
• On Portal das Finanças “Iniciar Sessão”, choose “Chave Móvel Digital” instead of “NIF/Senha”.
• Enter your mobile number, receive a one-time SMS code, and confirm.

The Digital Mobile Key Portugal scheme is available primarily to Portuguese citizens and legal residents with a Cartão de Cidadão. EU citizens with a CRUE and certain other foreign residents can also register CMD — check eligibility at autenticacao.gov.pt.

Forgot Portal das Finanças password — recovery options

• Security question recovery: go to “Recuperar Senha” and answer the security question you set at registration. AT mails a new password to your tax domicile in 5–10 business days — if you have moved, update your tax address first so the letter reaches you.
• SMS recovery: if you have a verified mobile number, request an SMS code through “Recuperar Senha” and set a new password immediately.
• Cartão de Cidadão recovery: if you have a CC, log in via autenticacao.gov.pt with your card and PIN, then set a new password on Portal das Finanças.

If you do not remember the security question, email portal-senhas@at.gov.pt with your NIF, full name, tax domicile, and a copy of your ID. AT will cancel the existing password, after which you can request a new one. Autoridade Tributária publishes its official password guidance in the Senha de acesso section of info.portaldasfinancas.gov.pt.

Security best practices

• Use a unique password — do not reuse passwords from other services.
• Change your password if you suspect it is compromised.
• Never share your password by email, phone, or SMS — Autoridade Tributária will never ask for it.
• Enable CMD as a second authentication method if you are eligible.
• Log out of Portal das Finanças when finished, especially on shared computers.