Portugal Mortgage Payments Rise 70 Euros a Month as August Euribor Averages 2.954 Percent

Portuguese homeowners on 12-month Euribor mortgages face a payment increase of 70.48 euros a month at their September revision, after the 12-month rate averaged 2.954 percent in August. The figure comes from calculations by consumer body DECO Proteste, reported to the Lusa news agency, and applies to a 150,000 euro loan over 30 years with a 1 percent spread.

The increase lands on every borrower whose contract resets this month, and the size of the jump depends entirely on which Euribor tenor the loan is indexed to.

What changed

August monthly averages came in at 2.513 percent for 3-month Euribor, 2.713 percent for 6-month and 2.954 percent for 12-month. Those averages are what banks feed into September revisions.

On the DECO Proteste benchmark loan of 150,000 euros over 30 years at a 1 percent spread, the three tenors produce three different outcomes:

- 12-month indexed loans move to 712.15 euros a month, up 70.48 euros. These contracts were last revised in September 2025.

- 6-month indexed loans move to 691.53 euros, up 47.42 euros, against a last revision in March 2026.

- 3-month indexed loans move to 674.66 euros, up 23.82 euros, against a last revision in June 2026.

The gap between the three is a function of how long each contract has been sitting on an older rate. The 12-month borrower is repricing off a full year of Euribor movement, which is why the increase is roughly three times the size of the 3-month adjustment even though the underlying rate difference is only about 44 basis points.

The climb is not new. At the end of April 2026 the same three tenors stood at 2.17, 2.45 and 2.74 percent, with the 12-month rate then at an 18-month high. Four months later each has moved up again, with the 12-month rate adding roughly 21 basis points over that stretch. Portuguese reporting in the spring noted that the European Central Bank had held its deposit facility rate at 2.0 percent since October 2024, which means the Euribor increase has been driven by market pricing rather than by a sequence of policy moves.

The mechanism

Portuguese variable-rate mortgages are indexed to Euribor plus a fixed bank spread, and they reset on a fixed cycle rather than continuously. A loan indexed to 12-month Euribor reprices once a year on its anniversary; a 6-month loan reprices twice a year; a 3-month loan four times. The rate applied at each reset is the monthly average of the relevant Euribor tenor for the preceding month, not the spot rate on the day.

That structure is why September is a distinct event rather than a gradual drift. Borrowers do not feel Euribor move day to day. They feel it in a single step at the revision date, sized by everything that happened since the last one.

The distribution matters for how widely this is felt. Bank of Portugal data for June 2026 puts 6-month Euribor at 39.9 percent of the variable-rate mortgage stock, 12-month at 31.3 percent and 3-month at 24.38 percent. Roughly a third of variable-rate borrowers are therefore exposed to the largest of the three September increases, and the 6-month plurality is exposed to the middle one.

What it means for a foreign buyer

For a non-resident buying in Portugal with local bank financing, the practical effect is on affordability testing and on the choice of index at signing.

Anyone modelling a purchase on rates quoted earlier in 2026 is now working from a stale number. A 150,000 euro loan at a 1 percent spread costs about 712 euros a month on the 12-month index, against roughly 694 euros in the spring. Larger loans scale proportionally, so a 400,000 euro purchase financed at 60 percent loan to value, a common non-resident ceiling, carries an increase of a similar order per hundred thousand borrowed.

The index choice is the actionable part. A 3-month index reprices more often but in smaller steps, which suits a borrower who expects rates to fall and wants to capture that quickly. A 12-month index locks the current rate for a full year, which is protection if Euribor keeps climbing and a cost if it does not. Portuguese banks offer all three, and the choice is made at signing.

Fixed-rate and mixed-rate products sidestep the reset cycle entirely, at a higher headline rate. The trade is between a known payment and a cheaper starting point.

Context

Portugal allows foreign nationals to buy residential property on the same legal footing as residents, with no nationality restriction on freehold ownership. Non-residents generally face lower loan-to-value ceilings than residents, and a Portuguese tax number is required before any purchase or mortgage can complete. The mortgage process for foreign buyers runs through the same banks that serve domestic borrowers, and the same Euribor indexation applies.

Financing cost sits alongside the transaction taxes and the annual holding charges that apply to non-resident owners. The IMI, IMT and AIMI framework governs the second of those, and the tax position for non-EU buyers has shifted since the NHR regime closed to new entrants.