Rent Reduction: Sample Letter and Calculation
The reduction request under Art. 270a CO: fill-in sample letter, official reference-rate history, calculation example and mailing checklist.
Checked on 19.08.2026 by Jens Herbst, BoVitaWe keep every document current and check it regularly against the sources.
Who is this document for?
For tenants whose rent is still based on a higher reference rate than the current one and who do not want to give money away.
What is inside
- Fill-in sample letter citing Art. 270a CO
- Official reference-rate history (from our maintained, date-checked source)
- Quick check: are you entitled at all?
- Calculation example with the per-0.25-points rule of thumb
- Mailing checklist and what to do if the landlord refuses
How to fill it in
- 1Do the quick check first; five questions show whether the request is worth it.
- 2Replace every [bracket field] in the letter; the calculation page supplies the numbers.
- 3Save as PDF and send by registered mail, not email; the checklist walks you through mailing.
Frequently asked questions
For tenants across Switzerland whose contract or last rent adjustment is based on a higher reference rate than the current official value; the quick check clarifies it in five questions.
The letter is based on Art. 270a CO and contains everything a management expects. It becomes effective with your correct details, your signature and timely registered mailing.
The request takes effect at the next ordinary termination date; send it as early as possible by registered mail. The kit explains the date logic for your contract.
To your landlord or the responsible management, by registered mail to the address in your lease; the mailing checklist covers the details.
You then have 30 days to involve the conciliation authority; the kit describes the refusal procedure step by step.
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