Banco de Portugal Tightens Mortgage Rules to a 45% Maximum DSTI on Wednesday 20 May 2026 — Five-Point Cut from the 50% Ceiling Lands Before Summer

The Banco de Portugal dropped the maximum taxa de esforço applicable to new housing loans from 50% to 45% of net household income, with the decision surfacing publicly on the morning of Wednesday 20 May 2026. The five-point cut to the macroprudential debt-service-to-income (DSTI) ratio ceiling closes a six-week consultation cycle the supervisor opened on 15 May, when reporting first flagged the regulator's intent to compress the maximum borrower stress envelope on residential mortgages by between five and ten percentage points before the summer borrowing peak.

The Five-Point Compression

The 45% threshold replaces the 50% ceiling that has anchored Portuguese mortgage underwriting since the recommendation entered force in July 2018. Under the prior frame, banks could lend to a household whose combined monthly debt service — across the new mortgage plus any pre-existing personal-credit, auto-credit and credit-card minimum repayments — absorbed up to half of the net monthly income. The new 45% perimeter cuts roughly €100 per month off the maximum servicing capacity for a couple netting €2,000 a month and, on the CNN Portugal worked example circulating since 15 May, lifts the implied minimum income required to obtain a typical mortgage on a €250,000 Lisbon apartment by around 11%.

The Exemption Windows Stay in Place

The recommendation's structural shape carries forward: institutions retain the 20% annual exemption window under which they may originate new credit at a DSTI of up to 60% inside the calendar year, and the parallel 5% window that allows breach of the headline limit altogether for niche cases. The 45% ceiling therefore reads as the new default rather than as a hard cap. Banks will continue to publish the breakdown across the two windows in the supervisor's Acompanhamento das Medidas Macroprudenciais bulletin, the quarterly compliance read that the regulator places on its institutional reporting portal.

The Underlying Stress Frame

The Banco de Portugal has flagged three drivers behind the calibration. The first is the renewed climb of the six-month Euribor through May 2026, which the supervisor reads as raising the variable-rate stress scenario the institutions must apply when sizing the borrower's repayment capacity. The second is the 100% public-guarantee envelope for buyers under 35 — the Garantia Pública à Habitação Jovem programme that has reached €2.3 billion of guaranteed credit across more than 25,000 contracts since launch and that the supervisor reads as introducing a structural risk concentration in the under-35 borrower cohort. The third is the cumulative household-debt-to-income ratio, which the BPstat April reading places among the highest in the eurozone.

What This Means for Expats

For foreign residents and new arrivals in the pipeline to buy a home in Portugal, the 45% ceiling lands as a real underwriting constraint rather than a theoretical guidance. Three practical implications follow.

Affordability ceilings: a foreign-source-income household with €4,500 of monthly net income now sees its maximum combined servicing capacity drop from €2,250 to €2,025 per month — at a 30-year tenor and a 3.9% effective rate, that is roughly €40,000 of borrowing capacity removed before any LTV or maturity overlay applies.

Pre-existing credit lines: any Portuguese auto loan, personal loan or credit-card minimum that already sits on the borrower's name is counted into the DSTI; non-resident applicants should clean their Central de Responsabilidades de Crédito footprint before the mortgage application to avoid the headline limit binding earlier than expected.

Pipeline timing: the supervisor's standard procedural pattern places the recommendation in force after a brief grace window for banks to update their internal scoring engines — buyers with a sale-and-purchase promise signed and the financing already approved under the 50% rule should expect their institution to honour the existing approval, but new applications from the effective date will run against the 45% ceiling.

The next reference point on the file is the Banco de Portugal Financial Stability Report due in June 2026, where the supervisor will publish the impact-assessment numbers behind the calibration and read out the first month of compliance data under the tightened frame.