Fixed or Variable Mortgage in Switzerland

Fixed-rate mortgages (hypothèque à taux fixe)

A fixed-rate mortgage locks in the interest rate for a defined term — typically 2, 3, 5, 7 or 10 years. The rate is agreed at the time of signing and does not change during the term, regardless of movements in market interest rates. At the end of the term, the mortgage is renewed at the prevailing market rate.

Fixed-rate mortgages provide certainty — the borrower knows exactly what the interest cost will be for the duration of the term. This makes budgeting straightforward and protects against interest rate rises. The trade-off is that if market rates fall during the term, the borrower cannot benefit from lower rates without paying a break fee (indemnité de résiliation anticipée).

SARON mortgages (variable rate)

SARON mortgages (formerly LIBOR mortgages) are linked to the Swiss Average Rate Overnight (SARON) — a short-term reference rate that reflects current money market conditions. The mortgage rate is typically SARON plus a bank margin of 0.7 to 1.2 percent, and is reset quarterly.

SARON mortgages are more flexible than fixed-rate mortgages — they can typically be terminated with 3 to 6 months' notice, without a break fee. They benefit from falling interest rates but are exposed to rising rates. In the current environment, SARON mortgages have been attractive due to low short-term rates, but borrowers should be prepared for rate increases.

Which to choose

The choice between fixed and variable depends on several factors: the borrower's risk tolerance (fixed provides certainty; variable involves rate risk); the current interest rate environment (if rates are low and expected to rise, fixing for a longer term may be prudent); the borrower's time horizon (if planning to sell within a few years, a SARON mortgage avoids break fees); and the borrower's financial flexibility (if cash flow is tight, the certainty of a fixed rate may be preferable).

Many Swiss borrowers split their mortgage between a fixed-rate tranche and a SARON tranche — diversifying the interest rate risk. For example, 50 percent fixed for 5 years and 50 percent SARON. This approach provides partial certainty while retaining some flexibility.

Break fees on fixed-rate mortgages

If a fixed-rate mortgage is terminated before the end of the term — for example, because the property is sold — the bank charges a break fee (indemnité de résiliation anticipée). The break fee compensates the bank for the loss of interest income for the remaining term and can be substantial — sometimes several percent of the outstanding mortgage balance.

Buyers who may need to sell the property within the mortgage term should factor potential break fees into their financial planning. A SARON mortgage or a shorter fixed-rate term may be more appropriate for buyers with an uncertain time horizon.

Key points

• Fixed rate: certainty for the term (2–10 years); no benefit from rate falls; break fee if terminated early
• SARON (variable): linked to short-term rates; flexible; benefits from rate falls; exposed to rises
• Many borrowers split: fixed tranche + SARON tranche for diversified rate risk
• Break fee on fixed mortgages can be substantial — consider if planning to sell
• Choice depends on risk tolerance, rate outlook, time horizon and cash flow needs