Mortgages in Portugal: What Foreign Buyers Need to Know
Getting a mortgage in Portugal as a foreign national is entirely possible — several major banks actively lend to non-residents — but the rules differ from what buyers from the UK, US, or Northern Europe may be used to. Understanding the key parameters before you start bank-shopping can save weeks and avoid disappointment.
The DSTI Rule: Portugal's Affordability Cap
Since 2018, Banco de Portugal has imposed a binding macroprudential limit on mortgage lending: the DSTI (debt-service-to-income) ratio cannot exceed 50%. This means that the sum of all your monthly debt payments — including the new mortgage plus any existing loans, credit cards (minimum payments), or car finance — cannot exceed half your gross monthly income.
Example: You earn €5,000/month gross and have an existing car loan of €300/month. Your maximum new mortgage payment = €5,000 × 50% − €300 = €2,200/month. Using a 4.25% rate over 30 years, that backs out to a maximum loan of approximately €430,000.
Banks may apply more conservative internal limits (35–45%) in practice. The 50% is the regulatory ceiling, not the guaranteed approval threshold.
LTV Limits: Residents vs Non-Residents
Loan-to-value is the proportion of the property's value you can borrow:
| Buyer type | Typical max LTV | Notes |
|---|---|---|
| Portuguese resident, primary home | 90% | Banco de Portugal limit |
| Portuguese resident, secondary | 80% | Varies by bank |
| Non-resident | 60–70% | Most banks; some offer 75–80% for EU residents |
| Golden Visa / investment | 50–65% | Property type dependent |
LTV is calculated against the lower of purchase price and bank valuation. If the bank values your €400,000 property at €370,000, the 70% LTV applies to €370,000 = €259,000 maximum loan, not €280,000.
How the Monthly Payment (PMT) Formula Works
All standard mortgage calculators use the PMT (payment) formula from finance theory:
PMT = P × r × (1+r)^n / ((1+r)^n − 1)
where P = principal, r = monthly rate (annual ÷ 12),
and n = number of monthly payments (years × 12).
Example: €250,000 loan, 4.25% annual, 30 years: r = 4.25% / 12 = 0.3542%; n = 360. PMT = 250,000 × 0.003542 × (1.003542)^360 / ((1.003542)^360 − 1) = €1,230/month.
Over 30 years the total repaid is €1,230 × 360 = €442,800 — meaning total interest paid is €192,800 (€442,800 − €250,000).
Fixed vs Variable Rate in Portugal
Most Portuguese mortgages have historically been variable rate, pegged to 3-month or 12-month Euribor plus a bank spread. In 2022–2024 rising Euribor caused significant payment increases for variable-rate borrowers. Banks now also offer:
- Fixed rate for 5/10/20/25 years: certainty at a typically higher initial rate. Popular with foreign buyers who want predictable costs.
- Mixed rate: fixed for 2–5 years, then variable. A common compromise.
Our calculator uses the rate you enter; change it to see how Euribor movements affect your payment. A 1% rate rise on a €250,000 / 30-year loan increases monthly payments by approximately €130–150.
Documents Required for a Portuguese Mortgage
To apply for a mortgage in Portugal you will typically need:
- Valid passport or EU ID card
- Portuguese NIF (tax number) — obtainable in one day at Finanças
- Last 3–6 months' payslips or, for self-employed, last 2 years' tax returns
- Last 3–6 months' bank statements
- Employment contract (for employed applicants)
- Property promissory contract (CPCV) or listing details
How Casa Helps with Mortgage Planning
When you save a property on Casa, you can enter your income and desired term to see instantly whether you can afford the property — accounting for DSTI limits, the regional IMT, and total acquisition costs. No more spreadsheet juggling between agent listings and bank calculators.