Euribor Climbs in April Even as the ECB Holds — Why Variable-Rate Households Will See May Mortgage Payments Rise Without Any Frankfurt Move

The European Central Bank's Governing Council voted unanimously on Wednesday 29 April to leave the deposit-facility rate flat — and yet the 12-month, 6-month and 3-month Euribor all closed higher in April than in March. For the roughly half of Portuguese mortgage borrowers on variable-rate contracts, that small shift in the index — not any decision out of Frankfurt — is what determines their May instalment. The arithmetic is mechanical: when a contract resets at six- or twelve-month intervals, the monthly Euribor average for the reference month sets the rate for the next reset window.

What Moved and Why

The Euribor rose in April because the underlying interbank market began pricing in a higher probability that the ECB will be forced to raise rates later in the year. The driver is not domestic — it is the Iran war's effect on energy prices, which has pushed the eurozone inflation outlook higher and reopened the door to ECB tightening that markets had largely written off. ECB President Christine Lagarde acknowledged at the post-Council press conference that the rate-hold decision was unanimous, but added that the debate about whether to raise rates had been "long and deep" — wording markets read as a hawkish tilt.

The signal lands directly on Portuguese household balance sheets because nearly half of the country's outstanding €113.6bn housing-loan stock is on a variable indexed rate, and another large chunk is on mixed contracts whose initial fixed period ends within the next two years. Each one of those contracts that resets in May or June will price off April's higher Euribor monthly average.

How Much More in May

For a typical €150,000 mortgage with 25 years remaining and a spread of around 1.0%, the May reset translates into a payment increase in the order of €20-€50 per month, depending on the previous reset date, contract structure and exact spread. Borrowers whose 12-month reset falls in April or May see the largest move; borrowers whose six-month reset already happened in March see no change in May but will reset higher in September. Fixed-rate (taxa fixa) and most misto contracts inside their fixed window are unaffected.

The other side of the same arithmetic: depositors holding variable-rate term products and Certificados de Aforro Série F see their pay-out rise. Aforro Série F May subscriptions yield 2.195%, the highest in a year, precisely because the Euribor that anchors that yield ticked up in April. The pattern reflects the standard transmission lag — Euribor moves first, deposit and Aforro coupons follow.

What This Means for Foreign Residents

• Check your reset month. If your contract is 12-month indexed and the reset falls in April or May, you will see the higher Euribor in your June or July direct debit. Six-month indexed contracts that reset in May feel it immediately; March-resetters wait until September.
• Refinancing window narrows. The renegociação route to lock into a fixed-mixto rate at 3- or 5-year tenor was easier in March, when banks were pricing for an ECB cut. April's Euribor move means new fixed-rate quotes have moved up; they have not yet caught up to the variable side, but the gap is narrowing.
• Credit decisions tightening separately. Banco de Portugal's Q1 Bank Lending Survey, released this week, showed banks tightening SME credit criteria and raising risk perceptions on housing loans for the next quarter — independent of the Euribor move but reinforcing the same direction of travel.
• Aforro and deposit rates rise alongside. Series F subscriptions in May benefit; new term-deposit promotions are likely to be re-priced upward in late May and June.
• Watch the 5 June ECB meeting. The next Governing Council decision is scheduled for 5 June. If energy prices stay high, markets are now pricing a non-zero probability of an actual hike — not just held-and-hawkish language.

For most variable-rate borrowers the May payment increase will be measured in tens of euros, not hundreds — but it is the first month-on-month rise since the ECB began the cutting cycle in 2024, and it puts the question of whether to switch to a fixed contract back on the household kitchen table.