Portal das Finanças: First Login and Registration Guide

• You need a NIF before you can register — the portal is built around it.
• Active CMD/Citizen Card can avoid the letter; AT's May 2026 manual gives an average of five working days for post, not a delivery guarantee.
• Services are grouped by profile: individual, business (Categoria B/IRC), or non-resident.
• Check My Area > Payments for each obligation and the payment methods available for that specific charge.
• The password letter goes to your registered fiscal address — the usual reason it never arrives.
• e-Balcão gets you a written answer from the AT, attached to your NIF and referenceable later.

Use the official Portal das Finanças for tax returns, payments, certificates and messages to the Autoridade Tributária (AT). Start there, not from a payment or refund message. This guide helps you register, recover a password, distinguish a lost second-code contact and find the service you need. Finkavo is not the government login page.

Choose the right registration or recovery route

Keep the AT authentication manual (May 2026) open for the exact recovery steps. With the security answer and a confirmed mobile, its recovery SMS contains a six-digit, single-use code valid for five minutes. Without the security answer, the official registered-email cancellation route uses portal-senhas@at.gov.pt and the identification details listed by AT; wait for the cancellation confirmation before re-registering. A missing SMS, a forgotten password and an incorrect NIF/CMD association are different faults, so choosing the route first avoids cancelling a working account unnecessarily.

Letters, urgent access and temporary outages

A password letter cannot be sent by email or to a casual delivery address. If it is late, check the fiscal address/representative and the request state, then contact the tax office of your domicile or CAT (+351 217 206 707, working days 09:00–19:00). Do not treat the five-day average as a deadline or repeatedly submit fresh requests without checking the first one. For an urgent obligation, ask the tax office about senha na hora: the exceptional password is valid for five days and must be changed on first use. It is not a general guaranteed same-day online service.

If the official service is temporarily unavailable, retain the error message and time, check AT notices and retry the official route. A website error does not itself extend a statutory deadline. Ask AT about the appropriate alternative for your obligation; Finkavo cannot restore government credentials or promise a deadline waiver. Before changing SIM or travelling, validate the new AT contact while you still control the existing one; a CMD or SSD contact change does not prove AT's record changed.

How to get set up

If CMD is your login route, use the CMD activation and troubleshooting guide. It distinguishes foreign-passport activation at a counter, missing NIF association and authentication PIN problems; a Finanças password is not universal eligibility for online CMD activation.

1. 1
   Get your NIF first

   The portal is built around your tax number — you can't register without one. See our NIF guide if you don't have one yet.

2. 2
   Choose how you'll log in

   Choose NIF/AT password, a valid Citizen Card with authentication PIN, reader and plugin, or an already active CMD with its PIN/security code. A Social Security password does not work here. For first registration through Citizen Card/CMD, complete the AT registration form and choose your own AT password.

3. 3
   Request your AT password, if that's your route

   Under Registar-se, complete the required fields. The initial password letter goes to the registered fiscal address, or the appointed representative's address where applicable: the May 2026 manual says an average of five working days, not a guarantee. Citizen Card/CMD registration avoids the letter. An initial password is for first access only and must then be replaced.

4. 4
   Log in and check your details

   Change an initial password on first access and validate your recorded email/phone using the supplied codes. Verify the fiscal address. AT second-factor login is currently optional in the covered individual/non-business rollout, unlike SSD's mandatory NISS/password second factor. A contact email is not adhesion to a formal tax-notification channel.

5. 5
   Find the service for your situation

   The portal is organised by taxpayer profile — individual, business (Categoria B/IRC), or non-resident — each with a different set of core services.

What you can do, by profile

The portal's services are grouped by taxpayer type:

• Individual taxpayer: file Modelo 3, check assessments, confirm household information, review e-Fatura, pay IUC and IMI, and request certificates. The dates for household and invoice tasks are published in the AT's calendar for each filing cycle.
• Business (Categoria B / IRC): declare the start, change or closure of activity, issue and classify invoices, submit the VAT and income-tax forms that apply, and review payment notices. Filing frequency and dates depend on the taxpayer's actual regime.
• Non-resident: file the returns that match the Portuguese-source income, manage the fiscal address and any representative or electronic-notification arrangement that is legally required, and request the appropriate certificates.

Paying what you owe

Open My Area > Payments to see obligations in voluntary collection or enforcement and the payment data for each one. The AT currently supports direct debit, Multibanco and homebanking references, MB WAY when its icon appears on that charge, and payment through tax offices, CTT or participating banks. Do not assume every charge offers every channel or can be split into instalments: follow the notice and the options shown for that debt.

IMI, IUC and the property side

If you own property, the portal is also where IMI appears. Under article 120 of the IMI Code, an annual amount up to and including €100 is paid in May; more than €100 and up to €500 is paid in May and November; and more than €500 is paid in May, August and November. AIMI is a separate calculation with deductions, ownership choices and property-category exclusions, so it is not safely determined by applying a €600,000 threshold to every property total.

The same area includes property records, Modelo 1 IMI services and electronic rent receipts. For cars and motorcycles, the 2026 IUC rule still uses the registration-anniversary month. Decree-Law 161/2026 changes the system from 2027, with a special transition that year: a taxpayer's total annual IUC up to €500 is paid once in October; a total above €500 is paid in July and October, with the option to pay it all in July. Check the year shown on the notice rather than reusing last year's date.

Proving you're in good standing

The certidão de dívida e não dívida proves your recorded tax position to third parties. Request Dívida e não dívida under Pedir Certidão. AT describes immediate online PDF availability. The regularised-status certificate is valid for four months under current CPPT Article 24, checked on 17 October 2026—not the three months still stated on the older service page. If the position is not regularised, the issued document reports that position. See the tax clearance certificate walkthrough for document selection, validity and PDF checks.

A tax-residence certificate is a different document. For a double-tax-treaty request, the AT validates it immediately when declarative obligations are in order; otherwise it can remain pending for review. Do not treat it as the same test as a debt certificate.

When something goes wrong

The AT password is posted to the fiscal address currently associated with your NIF. If the letter does not arrive, verify that address before requesting another password. If you already have Cartão de Cidadão or CMD authentication, the current recovery flow also lets you choose a new AT password without waiting for post. If it is wrong, seehow to change your fiscal address.

• Password never arrived: confirm the fiscal address/representative and request state, then contact the tax office/CAT or use a suitable authenticated recovery route.
• Password forgotten: use Iniciar Sessão > Recuperar Senha. Current options include Autenticação.gov (Citizen Card or CMD), the security-question route, and further recovery instructions.
• Urgent obligation and no working access: the AT's recovery guidance says a tax office can issue a 'senha na hora'; confirm opening and appointment requirements before travelling.
• Wrong personal or fiscal-address data: use the specific cadastral service for that field; the available channel depends on the person's identity and residence documents.

e-Balcão: getting an answer in writing

e-Balcão is the AT's secure electronic helpdesk for tax and customs questions. Registered interactions and replies remain available in the service. Use it to create a written record and attach the relevant facts, but remember that an e-Balcão reply is administrative guidance, not a substitute for legislation or a binding ruling.

If you're a non-resident

Do not assume that every non-resident needs a fiscal representative. Under the AT's current NIF guidance, a resident of a third country who begins a Portuguese tax legal relationship may, in the situations covered by that guidance, appoint a representative or opt into an approved electronic-notification channel. VAT has its own rule (art. 30.º CIVA): a non-resident without a permanent establishment who carries out taxable operations in Portugal must appoint a VAT representative only when they have no seat, establishment or domicile in another EU Member State (n.º 2); for a non-resident based in another Member State it is optional (n.º 1). Electronic notifications do not replace a mandatory VAT representative.

Treaty-relief and refund forms are income-specific. Confirm the form, deadline and required certification against the relevant AT instructions or treaty before filing; a Portal menu label is not enough to establish entitlement.

A note on security

Open the Portal das Finanças yourself rather than using a message link. Before entering credentials, verify that the address is https://www.portaldasfinancas.gov.pt or the official https://www.acesso.gov.pt authentication service, and prefer CMD, Citizen Card or AT two-factor authentication where available. Confirm refunds, assessments and payment data inside your own account.

The 2026 IRS calendar (for 2025 income)

• 16 February 2026 — communicate the duration or termination of a qualifying long-term rental contract, where applicable
• 2 March 2026 — update 2025 household information and validate 2025 e-Fatura invoices (the statutory end-February date rolled to the next business day)
• 16–31 March 2026 — review AT-calculated deductible expenses and submit the complaints covered by the AT calendar
• 1 April – 30 June — the Modelo 3 filing window
• 31 August 2026 — the AT's published target for an on-time return's refund or payment; follow the date on the assessment notice
• 1 June / 31 August / 30 November 2026 — IMI payment dates in the 2026 AT calendar, with the number of instalments determined by article 120
• For later filing cycles, use that year's AT calendar: February dates move when month-end is not a business day, and administrative extensions can be issued during the year.

See what AT records against you — debts, fines and payments due — in Finkavo → Opens your Finkavo account (sign in first if needed). Finkavo only reads AT; it never pays or files for you.