How currency denomination changes a loan
When you earn in one currency and owe in another, your debt is effectively a bet on the exchange rate. If your income currency weakens, both the monthly payment and the outstanding balance rise in your own money, even though the lender's figures stay unchanged.
The reverse also holds: if your income currency strengthens, the loan becomes cheaper. The difficulty is that nobody can forecast currencies reliably over a ten- or twenty-year mortgage, and households rarely have the reserves to absorb a sudden large move.
The Swiss franc loan episode
During the 2000s, hundreds of thousands of households in Poland, Hungary, Croatia, Austria and Romania took mortgages in Swiss francs, attracted by franc interest rates well below local ones. Banks often presented the franc as stable and low-risk.
After 2008 the franc appreciated strongly, and on 15 January 2015 the Swiss National Bank abandoned its minimum rate of 1.20 francs per euro. The franc jumped sharply within minutes, adding a large share to many borrowers' debts overnight.
What courts and governments did next
Hungary converted most foreign currency mortgages into forints in 2014 and 2015. In Poland, thousands of borrowers sued; in Dziubak (C-260/18, 2019), the Court of Justice of the EU allowed national courts to annul contracts with unfair exchange rate clauses.
The regulatory response in Europe
In 2011 the European Systemic Risk Board issued Recommendation ESRB/2011/1, urging supervisors to make lenders assess borrowers' resilience to currency moves and to inform them clearly about risks. Later, the Mortgage Credit Directive introduced specific rights for foreign currency mortgage borrowers.
Who might reasonably borrow in a foreign currency
The safest case is a borrower whose income is in the loan's currency: a cross-border commuter paid in francs who buys in France, or an expat paid in dollars financing a property abroad in dollars. Here the debt and income are naturally matched.
Natural hedges and partial matches
Some households have genuinely mixed income, for example rental revenue in euros and a salary in pounds. Borrowing a portion in each currency, proportional to income, can limit risk without forgoing the cheaper rate entirely.
Costs beyond the interest rate
Foreign currency loans carry conversion spreads on disbursement and on every repayment, plus international transfer fees if the account is held elsewhere. Lenders may also require larger deposits or apply stricter affordability buffers to absorb potential currency swings.
Interest rate differentials do not last
A gap between interest rates in two currencies often reflects expected currency movements. Over long periods, the saving from borrowing in a low-rate currency can be offset or overturned by appreciation of that currency, which is what Swiss franc borrowers experienced.
A simple illustration: a borrower saving two percentage points of interest on a loan of 200,000 gains about 4,000 a year at first. A single 15% appreciation of the loan currency adds roughly 30,000 to the balance, wiping out more than seven years of savings.
Domestic and foreign currency loans compared
The table summarises how a loan in your own currency differs from one in a foreign currency on cost, risk and protection, assuming the borrower's income stays in the domestic currency for the whole term of the loan and no hedge is in place.
| Feature | Loan in your income currency | Loan in a foreign currency |
|---|---|---|
| Monthly payment in your money | Predictable for fixed rates | Changes with the exchange rate |
| Outstanding balance | Falls as you repay | Can rise despite repayments |
| Interest rate | Domestic level | May be lower or higher |
| Conversion costs | None | On every payment |
| Specific EU protections | Standard consumer rules | Additional rights under mortgage rules |
Steps to assess a foreign currency loan
- Identify which currency your income is paid in and how stable that is likely to remain.
- Ask the lender for repayment simulations with your currency weakening by 20% and 30%.
- Check whether the contract gives a right to convert into another currency.
- Compare the total cost with a loan in your income currency, including conversion spreads.
- Keep a reserve fund to cover several months of higher payments.
- Confirm the lender's authorisation and read the risk warnings in a language you understand.
Common mistakes and red flags
- Choosing a currency purely because its interest rate is lowest today.
- Relying on assurances that a currency "never moves much".
- Ignoring that the outstanding balance, not only the instalment, can grow.
- Overlooking spread costs set by the lender rather than market rates.
- Paying an "FX hedging fee" to an unlicensed adviser who promises to lock in rates before arranging a loan.
Fraudsters sometimes sell "currency-protected" overseas loans that require a deposit to secure a supposedly fixed exchange rate. Genuine hedges are arranged by regulated banks or brokers and never require prepaying a stranger to unlock credit.
Foreign currency loan: frequently asked questions
These answers cover the issues borrowers raise most often when considering, holding or trying to exit a loan denominated in a currency other than the one in which they are paid, whether for property, a car or personal needs.
Can I convert my foreign currency loan into my own currency?
Under the EU Mortgage Credit Directive, member states must ensure borrowers of foreign currency mortgages have a right to convert or other arrangements limiting exchange risk. Consumer loans outside the mortgage rules depend on contract terms.
Is a foreign currency mortgage legal everywhere?
No. Several countries restricted or effectively banned new foreign currency lending to unhedged households after the 2008 crisis. Where it remains available, lenders must usually assess and disclose the risk more carefully than for domestic loans.
What is the warning threshold under EU rules?
The Mortgage Credit Directive requires lenders to warn borrowers when the value of the outstanding balance or instalments varies by more than 20% from what it would be at the exchange rate when the contract was signed.
Are Swiss franc loans still being litigated?
Court cases in Poland and other countries continued for years after 2015, generating a large body of national and EU case law. Anyone holding such a contract should seek specialised legal advice on its current status.
Useful organisations and resources
- Riksbank: ESRB recommendation on foreign currency lending — Swedish central bank notice explaining the recommendation for borrowers and lenders.
- CTR-CSR: FSMA implements ESRB foreign currency recommendations — Belgian news on how the financial regulator FSMA applies foreign currency lending safeguards.
- Central Banking: ESRB foreign currency lending recommendations — Specialist publication reporting on European measures to curb risky foreign currency loans.
Official and legal references
- ESRB Recommendation 2011/1 on lending in foreign currencies — European Systemic Risk Board text requiring risk disclosure and resilience tests for foreign currency borrowers.
- ESRB follow-up report on foreign currency lending — Assessment of how EU countries implemented safeguards on household foreign currency loans.
- EUR-Lex summary: consumer credit agreements — EU summary of disclosure duties for consumer loans, including credit in a foreign currency.