EuroCalc

Qu'est-ce que le/la Hypothèque à taux variable / SARON ?

Une hypothèque à taux variable a un taux d'intérêt révisé périodiquement selon un indice de référence, offrant un taux initial plus bas en échange d'un risque de taux.

Common US ARMs are described as 5/1 or 7/1: a 5- or 7-year fixed period followed by annual adjustments tied to SOFR or another index. Caps limit how much the rate can move per adjustment and over the life of the loan.

In Switzerland, the equivalent is the SARON-based mortgage, which resets every 1 or 3 months based on the overnight rate — fully variable from day one. ARMs are attractive when interest rates are expected to fall or when the borrower plans to sell before the first adjustment.

Exemple

A US borrower takes a 5/1 ARM at 4.5%; for years 1–5 the rate is fixed, then each year it resets to SOFR + 2.25%, with caps of 2% per adjustment and 5% over the life of the loan.

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Questions fréquentes

When is an ARM smart?+

When you plan to sell or refinance before the first reset, or when fixed rates are unusually high.

What is the worst case?+

Rates hit the lifetime cap, raising payments by hundreds or thousands per month.

What is a SARON mortgage?+

The Swiss equivalent — a fully variable mortgage tied to the overnight SARON benchmark.