Executive Summary
Purchasing real estate in France with income in Swiss Francs (CHF) is subject to specific lending rules. French banks apply the strict debt-to-income limit set by the HCSF (35%), but impose an exchange rate haircut (10% to 15%) on the Swiss salary to hedge against currency risk. Cross-border workers can opt for a loan in Euros or a foreign currency loan (CHF), the latter being legally permitted by the MCD Directive for individuals who actually receive income in the currency of the loan. Ultimately, the profitability of the operation relies on optimizing exchange rates when transferring the down payment and repatriating monthly mortgage payments.
1. Borrowing Capacity: Debt-to-Income Ratio and the Bank "Haircut"
Working in Switzerland undeniably offers higher purchasing power, making cross-border workers highly sought-after by French banks. However, credit institutions apply rigorous prudential rules dictated by the French High Council for Financial Stability (HCSF).
The 35% HCSF Standard
Since 2022, the maximum debt-to-income ratio is legally capped at 35% of your net income (including mortgage insurance). Furthermore, the maximum duration of a mortgage loan cannot exceed 25 years (or 27 years in the case of off-plan property purchases - VEFA).
The Cross-Border Specificity: The Haircut on CHF Salary
This is where the calculation differs from a standard French employee. Because your income is in CHF and your loan (or daily expenses) will mostly be in EUR, the bank factors in the exchange rate risk.
To calculate your borrowing capacity, the bank will not use the daily exchange rate. It will apply a margin of safety (haircut) to your net Swiss salary, usually between 10% and 15%.
Bank Calculation Example:
If you earn CHF 6,000 net per month. Instead of using a real rate (e.g., 1 CHF = 1.05 EUR), the bank will cut your salary by 10% (down to CHF 5,400), then apply a "stress" exchange rate (often close to 1 CHF = 0.90 EUR). The base income retained by the bank to calculate the 35% limit might only be €4,860, mechanically reducing your maximum borrowing capacity.
2. Choosing the Financing: EUR Loan or Foreign Currency Loan (CHF)?
As a cross-border worker, you have access to a credit structure reserved for a handful of borrowers: the foreign currency loan. It is crucial to understand its advantages, but especially its limitations in the event of life changes.
| Standard Loan in Euros (EUR) | Foreign Currency Loan (CHF) |
|---|
| The borrowed capital and monthly payments are denominated in Euros. | The capital and monthly payments are denominated in Swiss Francs, although the property is purchased in Euros. |
| The natural risk: You bear the exchange rate risk every month when repatriating your Swiss salary to pay the installment in euros. | The direct advantage: Elimination of the exchange rate risk on the monthly payment, as you repay the bank in the same currency as your salary. |
| Legality: Accessible through all banks. | Legality: Restricted by the MCD Directive. Authorized only if the borrower receives income or holds assets in the currency of the loan. |
| In case of unemployment or returning to France: You will receive income in euros (French salary or unemployment benefits) to repay a loan in euros. The currency risk remains zero, the monthly payment remains fixed in local currency. | The absolute danger: If you lose your Swiss job or decide to work in France, you will earn euros but must repay in CHF. You will then bear the full brunt of the exchange rate risk: if the Franc appreciates, the euro cost of your monthly payment will explode, jeopardizing your solvency. |
Expert Note: Historically, the CHF loan was highly favored because Swiss key interest rates (SARON) were much lower than European rates (Euribor). Although this gap has narrowed in recent years, the CHF loan remains a formidable wealth management tool to secure a monthly budget, provided you have high professional stability in Switzerland.
Reading time: 8 minutes | Published: April 1, 2026