Multi-currency mortgages in Spain: the multidivisa risk, Article 20 of Ley 5/2019 and why currency swings can wipe out your equity

How a loan in yen or Swiss franc works, the 20 per cent trigger, the conversion right and what the Supreme Court ruled.

A multi-currency mortgage, known in Spain as a hipoteca multidivisa, is a variable-rate home loan denominated in a foreign currency instead of euros, most commonly Japanese yen or Swiss franc. The attraction was a lower reference interest rate: during the Spanish property boom of 2007 and 2008, when the Euribor sat above 5 per cent, banks marketed these loans to around 70,000 families by pointing to the near-zero Japanese or Swiss rates. The Banco de Espana defines the product plainly on its Cliente Bancario portal as a mortgage that allows repayment in a currency different to the euro. The problem is structural: the instalment and the outstanding debt both fluctuate with the exchange rate, and when the foreign currency strengthens against the euro, the borrower pays more and owes more on the same loan. Article 20 of Ley 5/2019, de 15 de marzo, reguladora de los contratos de credito inmobiliario (BOE-A-2019-3814), in force since 16 June 2019, now regulates these loans, giving the borrower a conversion right and a 20 per cent swing trigger. Our mortgage law guide covers the broader Ley 5/2019 framework including floor clauses, fee caps and the notary transparency appointment, but does not address multi-currency mortgages, which are governed by a dedicated article.

What is a multi-currency mortgage and how does it work?

A multi-currency mortgage is a variable-rate loan where the reference currency is not the euro but a foreign currency. The borrower signs a loan in euros, but the debt is denominated in a different currency and the instalment is calculated in that currency each month. The borrower pays in euros, and the bank applies the prevailing exchange rate to convert the payment.

The interest rate is typically variable and referenced to a foreign benchmark such as the LIBOR (London Interbank Offered Rate) rather than the Euribor. Historically, the LIBOR for yen or Swiss franc was far lower than the Euribor, which made the product attractive when Euribor was above 5 per cent. The Banco de Espana provides a worked example on its Cliente Bancario portal: a loan of EUR 60,000 signed on 1 January 2017 at an exchange rate of 0.01 euro per yen gives a yen equivalent of 6,000,000 yen. At a monthly LIBOR of 0.098 per cent, the instalment is 28,067.33 yen, or EUR 280.67 at the original rate. If the exchange rate moves to 0.02 euro per yen by January 2020, the instalment in yen stays at 28,067.33 but in euros it doubles to EUR 561.34. The outstanding capital also surges: after three years the capital pendiente is 5,187,404.14 yen, whose euro equivalent is EUR 103,748.08, far above the original EUR 60,000.

The core mechanism is that the instalment in the foreign currency stays constant if the interest rate does not move, but the euro cost of that instalment swings with the exchange rate. The same applies to the total debt. This means a borrower can end up owing more in euros than they originally borrowed even while making every payment on time. The currency exchange guide explains the wider FX mechanics a foreign buyer faces in Spain, including bank spreads and SEPA transfer rules.

What does Article 20 of Ley 5/2019 require?

Article 20 of Ley 5/2019, titled “Prestamos inmobiliarios en moneda extranjera”, governs multi-currency mortgage loans signed on or after 16 June 2019. It creates four obligations on the lender and a nullity sanction for breach.

Requirement	Article	What it means for the borrower
Conversion right	20.1	The borrower can convert the loan to an alternative currency at any time
ECB exchange rate default	20.1	The conversion uses the European Central Bank rate on the request date unless the contract says otherwise
Periodic information	20.3	The bank must regularly inform the borrower of the outstanding debt, any increase and the conversion right
20 per cent swing trigger	20.4	The bank must inform the borrower when the debt or instalment diverges by more than 20 per cent from the euro equivalent at signing
FEIN illustrative example	20.5	The FEIN must show the effect of a 20 per cent currency swing if the contract has no exchange-rate risk limit
Nullity sanction	20.6	Non-compliance triggers nullity of the multidivisa clause for consumer borrowers

The conversion right in Article 20.1 is the most significant protection. The borrower can convert the loan to one of two alternative currencies: (a) the currency in which the borrower receives the greater part of their income or holds the majority of the assets used to repay the loan, as declared in the most recent solvency assessment, or (b) the currency of the EU member state where the borrower was resident at signing or is resident at the time of the conversion request. The borrower chooses between the two options at the time of requesting the change. The exchange rate used is the rate published by the European Central Bank on the date of the request, unless the contract provides otherwise.

Article 20.2 allows non-consumer borrowers (those acting in a professional or business capacity) to agree a different exchange-rate risk limitation mechanism with the lender instead of the conversion right. This carve-out does not apply to consumer borrowers, who keep the full Article 20.1 protection.

When does the 20 per cent currency swing trigger apply?

Article 20.4 requires the bank to provide the Article 20.3 information (outstanding debt, increase breakdown, conversion right and conditions) whenever the outstanding debt or the periodic instalment has diverged by more than 20 per cent from the amount that would have applied using the exchange rate between the loan currency and the euro at the date of signing. The trigger is measured against the original signing exchange rate, not a rolling benchmark.

The 20 per cent threshold is the same figure that appears in the FEIN requirement. Article 20.5 requires the bank to disclose the Article 20 provisions to the borrower through both the FEIN (Annex I of Ley 5/2019) and the loan contract itself. If the contract does not contain provisions to limit the exchange-rate risk for fluctuations below 20 per cent, the FEIN must include an illustrative example showing the effect of a 20 per cent exchange-rate swing on the instalment and the total cost of the loan. This is the stress test the law builds into the pre-contractual disclosure, designed to ensure the borrower sees the downside before signing, not after.

This FEIN requirement sits alongside the broader pre-contractual information duties in Article 14.1, which require the bank to deliver the FEIN, the FiAE (Standardised Warnings Sheet) and a draft contract at least 10 natural days before signing. The FiAE under Article 14.1.b must include a reference to the fact that the loan is in a foreign currency. The mortgage linked products guide covers Article 17 on tied selling, while the non-resident mortgage guide explains borrowing capacity and rate structures for foreign buyers.

What happens if the bank fails to comply with Article 20?

Article 20.6 contains the sanction. Failure to comply with any of the requirements in Article 20 causes nullity of the multidivisa clauses in favour of the consumer borrower, and allows the borrower to request modification of the contract so that the loan is treated as if it had been granted from the beginning in the currency in which the borrower receives the main part of their income.

This is a retroactive recalculation, not a simple currency swap at the current rate. The entire payment history is recalculated as if the loan had been in the borrower’s income currency from the first day. All instalments already paid are applied to capital and interest in that currency, the outstanding principal is recalculated, and the future instalment is set on the new basis. The Banco de Espana confirms this is how the nullity remedy works: the loan is rewritten, not merely converted.

The nullity sanction applies only to consumer borrowers. Non-consumer borrowers (those acting in a professional capacity) fall under Article 20.2, which lets them agree a different risk-limitation mechanism and does not carry the same automatic nullity remedy.

What did the Supreme Court rule on pre-2019 multi-currency mortgages?

Ley 5/2019 applies to loans signed on or after 16 June 2019. For the roughly 70,000 multi-currency mortgages signed before that date, the legal battlefield has been transparency control under consumer protection law, and the Spanish Supreme Court (Tribunal Supremo) has ruled consistently in favour of borrowers.

STS 608/2017 (15 November 2017, Pleno de la Sala Primera) is the landmark ruling. The full Civil Chamber held that the multidivisa clause is subject to transparency control. The clause is complex and the bank must inform the borrower clearly of the currency-exchange risk. If the bank fails this transparency duty, the clause is partially null: the loan is recalculated as if it had been denominated in euros from the start. The Court chose partial nullity rather than full nullity of the contract, because full nullity would force the borrower to repay the entire outstanding capital at once, which would harm the consumer more than the bank.

STS 564/2018 (9 October 2018) confirmed the doctrine against Barclays, now part of CaixaBank. The Court applied the same transparency test case by case: if the bank’s pre-contract documentation did not clearly explain the currency risk, the multidivisa clause falls. STS 599/2018 (31 October 2018) applied a different outcome where the borrower was a financial-sector professional who understood the risks, showing the test is individualised, not blanket.

The European dimension matters too. The Court of Justice of the European Union ruled on 20 September 2017 (Case C-186/16) that the multidivisa clause must be assessed for abusiveness under the Unfair Contract Terms Directive, confirming that national courts must examine whether the bank gave the borrower sufficient information to understand the currency risk.

Who was affected and what should an existing borrower do?

The multidivisa was primarily sold between 2006 and 2008, when the Euribor was above 4 per cent and the Japanese yen and Swiss franc offered reference rates near zero. The main lenders were Barclays (now CaixaBank), Bankinter, BBVA and Banco Santander. The borrowers were often specific professional groups: airline crews (Iberia, Air Europa, Vueling), pilots (SEPLA), civil servants and others with stable incomes, who were targeted because the banks believed they could absorb the risk. ASUFIN, the Spanish financial users association, reported over 3,000 affected members among its ranks.

For an existing borrower with a pre-2019 multidivisa mortgage, the first step is to request the full pre-contract documentation from the bank and assess whether the currency risk was clearly disclosed. If it was not, a claim for partial nullity and retroactive recalculation in euros may be available under STS 608/2017. The mortgage subrogation and refinancing guide explains how to switch lenders, and the Spanish mortgage rate types guide compares fixed, variable and mixed structures.

For a borrower considering a new multi-currency mortgage after 16 June 2019, Article 20 of Ley 5/2019 provides the conversion right and the 20 per cent trigger. The lower interest rate remains the attraction, but the Banco de Espana is explicit on its Cliente Bancario portal that the instalment and the debt can vary every month with both the interest rate and the exchange rate, and that the currency you borrow in differs from the currency you earn in. The mortgage stress test guide explains how banks assess non-resident affordability, and the mortgage life insurance guide covers what insurances a bank can require.

Feature	Pre-2019 multidivisa	Post-June 2019 multidivisa (Article 20)
Conversion right	Contract-dependent	Statutory, Article 20.1, at ECB rate
20 per cent swing trigger	None	Article 20.4, mandatory bank disclosure
FEIN stress example	None	Article 20.5, mandatory if no risk limit
Nullity sanction	Transparency control via STS 608/2017	Article 20.6, automatic for consumers
Recalculation basis	Retroactive to euros (STS 608/2017)	Retroactive to income currency (Art 20.6)
Non-consumer borrowers	Same transparency test	Article 20.2, may agree alternative risk limit

This guide is general information, not legal or tax advice. Rules change and individual circumstances differ. Verify current requirements with an independent lawyer (abogado) or tax advisor (gestor/asesor fiscal) before acting.