How to Pay Tax Bills and Set Up Direct Debit at Portal das Finanças (2026)
Step-by-step guide to paying tax bills and setting up direct debit (débito direto) at Portal das Finanças - Multibanco, MB WAY, and automatic payments.
Contents
- What can be paid at AT
- Path A - Pay a one-off bill (Multibanco / MB WAY)
- Path B - Set up direct debit (recommended)
- Important: direct debit doesn’t pre-authorize unknown charges
- What happens if you owe and don’t pay
- Splitting IMI into installments
- When direct debit might fail
- When you actually want to pay manually
- Sources
Portuguese tax bills come in three main flavours - annual IRS settlement, IUC (vehicle tax), and IMI (property tax) - plus quarterly Social Security if you’re a freelancer. All four can be paid by Multibanco reference, MB WAY, or direct debit. Setting up direct debit takes 5 minutes once and saves a lifetime of “did I pay that?” mental load.
This guide covers paying a one-off bill and setting up automatic payments at AT.
What can be paid at AT
| Tax | When | Direct debit available? |
|---|---|---|
| IRS (annual settlement) | Aug-Sep after filing | ✅ |
| IUC (Imposto Único de Circulação - vehicle tax) | Annual, your birth month | ✅ |
| IMI (Imposto Municipal sobre Imóveis - property) | May / Aug / Nov (split) | ✅ |
| IMT (property purchase) | One-time at acquisition | ❌ (manual) |
| IRC (corporate tax) | Annual + interim | ✅ |
| Late-payment surcharges | When applicable | ❌ |
Social Security has its own direct debit setup at SS Direta - see the quarterly declaration guide for that.
Path A - Pay a one-off bill (Multibanco / MB WAY)
Find the bill in your conta-corrente ↗
Log in. Navigate to: Os seus serviços → Pagamentos → Conta-corrente
Pending bills are listed with:
- Tax type (IRS / IUC / IMI / etc.)
- Reference number
- Amount due
- Due date
Click on the bill you want to pay.
Cidadãos › Pagamentos › Conta-corrente
Pagamentos pendentes
IRS - liquidação 2025
€442.18 · vence 31-Ago-2026
IUC - viatura XX-XX-XX
€156.30 · vence 30-Set-2026
IMI - 1.ª prestação 2026
€312.50 · pago em 31-Mai-2026
Schematic - actual UI may differ. Illustrates layout, not exact pixels.
Get the Multibanco payment reference
AT shows three pieces of info for any bill:
- Entidade - 5-digit number (always starts with
1xxxx) - Referência - 9-digit reference unique to this payment
- Montante - exact amount
These three values together identify your specific payment. Save them - they’re what you’ll enter at any Multibanco ATM, MB WAY app, or internet banking.
Pay via your preferred channel
Three options:
Multibanco ATM:
- Insert your card → Outros operações → Pagamentos → Pagamento ao Estado
- Enter Entidade, Referência, Montante exactly as shown
- Confirm - instant payment
MB WAY app (most banks support this):
- Open MB WAY → Pagar → Pagamento ao Estado
- Enter the three values
- Confirm with PIN / Face ID
Internet banking (Millennium, Santander, NovoBanco, BPI, Caixa Geral, ActivoBank, Revolut PT, etc.):
- Login → Pagamentos → Pagamentos ao Estado / Pagamento de Serviços
- Enter the three values
- Confirm
Payments reflect on your AT conta-corrente within 1-2 business days.
Path B - Set up direct debit (recommended)
Navigate to 'Aderir a débito direto'
Path: Os seus serviços → Pagamentos → Débito Direto → Aderir
AT shows a list of tax types that support direct debit. You can enable any combination - most common is IRS + IUC + IMI all at once.
Provide your IBAN
- IBAN of your Portuguese bank account
- Nome do titular - must match the IBAN holder
AT generates a SEPA mandate for your bank, which authorizes AT to pull the exact tax amount on the due date.
Cidadãos › Pagamentos › Débito Direto › Aderir
Aderir a débito direto
Tipo de imposto
IRS, IUC, IMI ▾
IBAN
PT50 0033 0000 0000 0000 0000 1
Titular da conta
Nome do contribuinte
Aceito as condições do mandato SEPA
Confirmado
Schematic - actual UI may differ. Illustrates layout, not exact pixels.
Confirm - direct debit is active
AT registers the mandate immediately. From this point:
- Future tax bills are auto-paid on their due dates
- Your bank statement shows the debit with reference “AT - IRS / IUC / IMI”
- You still get the conta-corrente notification, but it shows “PAID AUTOMATICALLY”
To cancel later: same path, click “Cancelar adesão”. Takes effect for the next billing cycle.
Important: direct debit doesn’t pre-authorize unknown charges
The SEPA mandate is specific to known tax types (IRS, IUC, IMI, etc.). AT can only pull amounts assessed against you for those specific taxes. They cannot:
- Pull arbitrary amounts
- Pull for other tax types not on your mandate
- Pull from a closed/different bank account
If AT tries to debit and your account has insufficient funds, the bank rejects it; AT then sends a normal payment notice with the standard 30-day grace period before late fees kick in. No risk of unauthorized overdraft.
What happens if you owe and don’t pay
| Day | What |
|---|---|
| Due date | Direct debit pulls (if set up) OR manual payment due |
| +1 day | If unpaid: AT sends notice via Portal das Finanças |
| +30 days | Grace period ends. Late fee (€25-€80 fixed) added. |
| +60 days | 4% annual interest accrues on outstanding balance |
| +90 days | Possibility of collection action (bank account freeze, salary garnishment). Rare for small amounts but happens. |
| Subsequently | Compromises citizenship/residency renewals - AT shows pending debt on the certidão de não dívida |
Setting up direct debit eliminates 95% of this risk.
Splitting IMI into installments
If your IMI exceeds €100/year, AT auto-splits into two payments (May + November). Above €500, three payments (May + August + November). Direct debit handles all three automatically.
If you’d rather pay all at once: opt for “pagamento integral” via the conta-corrente before May’s first installment is due. Saves bank processing time but doesn’t change the amount.
When direct debit might fail
The SEPA pull can be rejected by your bank if:
- Insufficient funds on the due date
- Account closed or frozen
- Mandate revoked at the bank side without telling AT
If a debit is rejected, AT sends you a normal payment notice. You then have the standard window to pay manually before late fees apply. Not a disaster, but check your account balance the day before each major tax due date if you’re running close to the line.
When you actually want to pay manually
A few cases where direct debit isn’t the move:
- Cash flow tightness - if you’d rather control the timing of large payments (e.g., €3k IRS settlement) to align with cash flow, manual is better
- Disputed amounts - if you’re contesting a bill, don’t auto-pay it; pay only what’s not disputed
- Strange or unfamiliar bills - verify the source before paying. Direct debit pulls automatically; you’d rather catch a wrong bill before AT takes the money
Sources
Try the numbers for your situation
Run your own scenario in the calculator.
Free, no signup. Same engine that powers the examples in this article.
Open calculator →Related guides
-
general
Working as Both an Employee and a Freelancer in Portugal - Tax Guide 2026
How Portuguese tax works when you have both a salary and freelance side income - englobamento, the year-1 trap, SS rules, and worked examples.
-
general
How to File Your IRS in Portugal - Modelo 3 Step-by-Step (2026)
Complete walkthrough of filing your annual IRS in Portugal - Auto-IRS vs manual Modelo 3, joint filing, deadlines, and the mistakes that delay refunds.
-
general
Foreign-Source Income in Portugal - Anexo J Step-by-Step (2026)
How to declare foreign-source income on Anexo J of your Portuguese IRS. Bank interest, dividends, foreign salary, double-taxation treaties, and tax credits.