The Swiss mortgage reference rate is 1.25%. If your rent is still based on a higher rate, you may be able to request a reduction. Enter two things to estimate it.
Swiss net rents are tied to the mortgage reference rate. When it falls below the rate your rent is based on, you can ask for a reduction (Art. 270a OR). Each 0.25% step is worth about 2.91%.
Your landlord may offset part of it: up to 40% of inflation (CPI) since your last adjustment, plus a general cost allowance (~0.5%/year). We subtract both to show a realistic estimate.
Data status: the official BWO rate remains 1.25%, unchanged from 2 September 2026 (publication: 1 September 2026). Check the current BWO publication. Indexed, graduated and subsidized rents may follow different rules.