Debt & Credit
Borrowing in a currency you do not earn adds a second debt
The repayment is fixed in one currency and your income arrives in another. That gap is a risk in its own right.
Everything below about foreign currency borrowing comes from what actually happens rather than from what is supposed to.
What holds up in practice
- Exchange movements can raise the cost of a fixed repayment.
- The outstanding balance can grow in your own currency without any interest change.
- Some jurisdictions restrict such lending to individuals for this reason.
The mismatch that creates the risk
A loan denominated in one currency must be repaid in that currency, regardless of what you are paid in. If your income currency weakens against the loan currency, each repayment costs more of your income even though the payment itself is unchanged.
The outstanding balance behaves the same way, so the amount you owe measured in your own currency can rise substantially. None of this requires the interest rate to move, which is what makes the risk unfamiliar to borrowers used to domestic lending. The mismatch is between the currency of the obligation and the currency of the income, and everything else follows from it.
Why the lower rate is offered
Interest rates differ between currencies for reasons rooted in each economy, and a borrower may be attracted by a lower rate abroad. That rate difference is broadly reflected in how markets price future exchange rates, so the apparent saving is compensation rather than a gift. Over any particular period the outcome may be better or worse, but the lower rate is not free money waiting to be collected.
Over a full year, borrowers who took low-rate foreign currency mortgages have in various countries found the balance rising sharply after currency movements. Those episodes are why several jurisdictions now restrict or heavily regulate such lending to individuals.
When the structure makes sense
The risk largely disappears when income and debt are in the same currency, which is the case for someone paid abroad. It also reduces where an asset generating income in the loan currency secures the borrowing, such as a rental property located there. Matching the currency of the debt to the currency of the cashflow that services it is the general principle.
Where no such match exists, the borrowing carries a currency position whether or not one was intended. Anyone whose income currency might change, such as someone planning to relocate, should consider both scenarios rather than the current one.
Costs beyond the rate
Each repayment usually involves a currency conversion, and the spread on that conversion is a recurring cost across the whole term. Retail conversion costs are frequently wider than the wholesale rates quoted in the press, and they apply every month. Some lenders offer conversion options that cap or fix the exchange rate, and these carry their own charges.
Cross-border lending also involves legal and valuation costs that are typically higher than a domestic equivalent.
Adding these together often removes a good part of whatever rate advantage prompted the arrangement.
Protections and disclosure
Several regulatory regimes now require lenders to warn borrowers about currency risk and sometimes to offer a right to convert the loan. The thresholds that trigger such rights, and what they entitle a borrower to, vary considerably between jurisdictions.
Where a right to convert exists, it is usually triggered by a specified adverse movement and must be exercised rather than applying automatically. Understanding whether any such protection applies before signing is far more useful than discovering it during a currency shock. These rules change, so the current position in the relevant country is the only reliable basis.
The right answer depends on your tax situation, which this cannot see.
Assessing the exposure honestly
A useful test is to recalculate the payment and the balance assuming a large adverse currency movement, of the kind that has occurred historically. Major currency pairs have moved by substantial amounts over periods of a few years, in both directions and without warning. If that scenario makes the borrowing unaffordable, the exposure is larger than the household can carry.
Cross-border borrowing also involves tax and legal questions that differ by country and are genuinely complex. Anyone considering it should take regulated advice in both jurisdictions rather than relying on general information such as this.
The takeaway
Match the currency of the debt to the currency of the income that services it. Where you cannot, price the mismatch before signing.
Write the number down before you decide. It usually decides for you.
Questions readers ask
Why would anyone borrow in a foreign currency?
Usually because the interest rate is lower, or because income or an asset sits in that currency. The second reason reduces risk; the first mostly relocates it.
Can the amount I owe increase without the rate changing?
Yes. Measured in your own currency, the outstanding balance rises if your currency weakens against the loan currency, regardless of interest.
