Interest Now Eats 49.5% of the Average Portuguese Mortgage Payment, and New Borrowers Face €731 a Month

Almost exactly half of what the average Portuguese household pays its bank each month for the family home is no longer buying the house. It is buying time. In July, interest accounted for 49.5% of the average mortgage instalment, according to figures published on Thursday by the Instituto Nacional de Estatística (INE), Portugal's statistics office, in its monthly release on implicit interest rates in housing credit.

The implicit rate across the whole stock of housing loans climbed to 3.135% in July, 3.4 basis points above June. That is the second consecutive monthly increase and it undoes the brief relief of the spring, when the rate slipped to 3.065% in May, its lowest reading in roughly three years. Loans signed in the previous three months, the closest thing INE publishes to a live market price, moved from 2.853% in June to 2.910% in July.

The two mortgages: €414 and €731

The headline instalment looks manageable. Averaged across every housing loan in the country, the monthly payment settled at €414, three euros more than in June and twenty euros more than in July 2025. The average capital still owed on those loans is €79,463, up €598 on the month.

The number that matters for anyone buying now is a different one. On contracts signed in the last three months, the average instalment rose €16 to €731, a 15.1% increase on the same period a year earlier. The gap between €414 and €731 is not a pricing anomaly; it is the difference between a stock and a flow. The national average is weighted down by long-running loans taken out when houses cost far less and whose outstanding balances have been amortised for a decade or more. New borrowers are financing today's prices at today's rates, on a full balance.

Why the rate is drifting up again

Portuguese mortgages are overwhelmingly variable-rate and indexed to Euribor, so the INE series is essentially a lagged mirror of the interbank market. Euribor spent the first months of 2026 easing, which is why the implicit rate fell through April and May. It has since turned: the twelve-month rate has pushed back above 2.9% during August, with the three- and six-month rates also setting fresh highs. The European Central Bank left its policy rates unchanged at its July meeting, so the move is being driven less by monetary policy than by a risk premium attached to the conflict in the Middle East and to what it might do to energy prices.

Because most loans reprice on a six- or twelve-month cycle, that August Euribor reading will not show up in the INE numbers for months. The direction of travel, though, is now reasonably clear, and it points the same way as the August repricing wave that has already reached households whose anniversary date fell this month.

What this means for foreign residents

• Budget for the new-contract number, not the national average. If you are buying in the coming months, €731 is the more honest anchor. The €414 figure describes the country's existing debt, not the price of entry.
• Affordability tests are tighter than they were. Since 1 August the Banco de Portugal has capped the debt-service-to-income ratio for most new borrowers at 45%, down from 50%. A rising index eats directly into that headroom, which is worth knowing before you commit to a purchase price. Our note on the new limits sets out how they apply.
• The interest share argues for checking your spread. With interest at 49.5% of the average payment, the fixed margin your bank adds to Euribor is doing a lot of work. Renegotiating or transferring a loan is free of early-repayment penalties on variable-rate contracts, and the practical steps are covered in our guide to securing a crédito habitação.
• Renting is not the obvious escape. Idealista's latest effort-rate reading put a typical rent at 82% of a single Portuguese salary, against 76% for buying. Both sides of the housing market are stretched.

The broader picture is one of an economy still adding mortgage debt into a rising rate. Household housing credit passed a record €180 billion earlier this month even as the regulator tightened the taps. INE publishes its August reading in late September, and unless Euribor reverses quickly, the interest share of the average instalment looks more likely to cross 50% than to fall back below it.