Challenging Your Initial Rent (Anfangsmietzins) in Switzerland

Every new tenancy in Switzerland starts with a rent the landlord sets. Most tenants never question it, but Swiss law gives a new tenant a narrow, thirty day window to challenge that opening figure as abusive, and in a growing list of cantons the landlord is required to disclose the prior rent on an official form at the moment the lease is signed.

This page covers the Anfangsmietzins challenge under Art. 270 OR, the cantonal Formularpflicht that requires a landlord to use that disclosure form in specific cantons, and the Schlichtungsbehörde, the conciliation authority that hears the case. It is part of our wider Swiss tenant law coverage, itself part of the broader guide to Swiss law.

Information last verified on 21 July 2026. This page provides general legal information about Swiss law and does not constitute legal advice in an individual case.

Art. 270 OR: challenging the Anfangsmietzins

The starting rent on a new lease is called the Anfangsmietzins. Art. 270 Abs. 1 OR gives a tenant 30 days from taking over the rented unit, not from signing the lease, to challenge that figure at the Schlichtungsbehörde as abusive within the meaning of Art. 269 and Art. 269a OR, and to ask for it to be reduced.

There are two independent grounds for this challenge. The first is that the tenant was forced into signing because of a personal or family hardship, or because of conditions on the local market for housing or business premises, meaning there was effectively no realistic alternative. The second, entirely separate ground is that the landlord raised the rent significantly compared to what the previous tenant paid for the same unit.

A tenant only needs one of these two grounds to bring a challenge, not both. Once either is shown, the Schlichtungsbehörde assesses whether the resulting rent is genuinely abusive under the general Art. 269 and Art. 269a OR standards, which weigh factors such as return on investment and comparable local rents.

The cantonal Formularpflicht under Art. 270 Abs. 2 OR

Art. 270 Abs. 2 OR does something different from the challenge right itself. It allows a canton, where there is a housing shortage in its territory or in part of it, to make it mandatory for landlords to use the official form described in Art. 269d OR when signing a new lease.

That form must disclose the previous rent charged for the same unit, so an incoming tenant can immediately see whether the new figure represents a significant increase without having to ask the landlord or a former tenant directly. This is a cantonal decision, made canton by canton, and it only applies where the canton has actually ordered it. It is not a nationwide requirement.

Do not confuse this with the landlord's termination form

This is the point most worth getting right, because mixing the two up leads to the opposite of the correct answer. Art. 270 Abs. 2 OR is about disclosing the PRIOR rent on a form used when a NEW lease begins, and it only applies in cantons that have specifically ordered it because of a housing shortage.

Art. 266l OR is a completely different requirement. It says a landlord terminating any dwelling or business lease must use a cantonally approved form, and Art. 266o OR makes that termination void if the wrong form, or no form, is used. This termination form rule applies in every canton, always, with no housing shortage trigger at all.

A tenant told their landlord's TERMINATION notice was invalid because "the canton doesn't require the form" has been given the wrong answer. That reasoning only applies to the Art. 270 Abs. 2 initial rent disclosure form. The Art. 266l termination form is mandatory everywhere in Switzerland, in every canton, regardless of vacancy rates or housing shortages.

Which cantons currently require the form

The list below reflects the most recent Bundesamt für Wohnungswesen (BWO) Verzeichnis, the federal housing office's official tracking document of where the Art. 270 Abs. 2 Formularpflicht is currently in force. This list changes over time as housing markets shift, so treat it as a snapshot rather than a permanent ruling.

Neuchâtel's coverage runs commune by commune rather than canton wide. The form currently applies in the commune of Neuchâtel itself, Laténa for four and five room units, Cornaux, Cressier, Le Landeron, Boudry, Cortaillod, Milvignes, Rochefort, La Grande Béroche for three, four and five room units, and Val de Ruz. It does not currently apply in most of the canton's smaller communes, including La Chaux de Fonds, Le Locle, and the Val de Travers communes.

Vaud's coverage is by district. The form is currently required in nine of the canton's ten districts: Broye Vully, Gros de Vaud, Jura Nord vaudois, Lausanne, Lavaux Oron, Morges, Nyon, Ouest lausannois and Riviera Pays d'Enhaut. The single exception, where the form is NOT currently required, is the district of Aigle.

A stale figure worth flagging: Nidwalden

Some sources circulating online still list Nidwalden as a canton requiring the Art. 270 Abs. 2 form. The current BWO Verzeichnis does not track or list Nidwalden at all, meaning it is not among the cantons currently applying the Formularpflicht.

A tenant in Nidwalden relying on an older source that lists the canton as covered would reach the wrong conclusion about whether their landlord was required to disclose the prior rent. Because this list is reissued periodically as housing conditions change, always confirm the CURRENT status directly against the BWO's published Verzeichnis rather than a secondary site, whether the canton in question is Nidwalden or any other.

The Schlichtungsbehörde: what to actually expect

Both the Art. 270 initial rent challenge and later disputes over increases or terminations route through the same body, the Schlichtungsbehörde in Mietsachen, the conciliation authority for tenancy matters. For a tenant weighing whether the process is worth the trouble, three practical facts matter more than the legal theory.

First, this step is mandatory, not optional. A tenancy dispute of this kind cannot normally go straight to a civil court. It has to pass through the Schlichtungsbehörde first, which functions as a required conciliation stage rather than a preliminary option a party can skip.

Second, it costs nothing in court fees. Art. 113 Abs. 2 lit. c ZPO exempts tenancy and lease disputes from Gerichtskosten at the conciliation stage, and Art. 113 Abs. 1 ZPO also means neither side is awarded the other side's costs regardless of outcome, so each party normally covers only its own expenses, such as a lawyer if it chooses to bring one.

Third, no lawyer is required, and in fact personal appearance is the default rule rather than the exception. Art. 204 Abs. 1 ZPO requires both parties to appear in person at the hearing. A lawyer or a trusted person may accompany a party for support under Abs. 2, but being represented INSTEAD of appearing personally is only available in specific listed situations, such as living outside the canton or abroad, illness, age, or other significant cause.

Timing and what happens next

The 30 day window under Art. 270 Abs. 1 OR runs from when the tenant takes over the rented unit, which is usually the day the keys are handed over, not the date the lease was signed. Missing this window generally forecloses the initial rent challenge specifically, though it does not affect a tenant's separate right to challenge a later increase within its own 30 day window, covered on our rent increases page.

Once a Begehren is filed, the Schlichtungsbehörde will schedule a hearing and, per VMWG Art. 21, actively try to broker a comprehensive settlement covering the tenancy as a whole rather than only the narrow point in dispute. If no settlement is reached, the authority issues a decision or referral that allows the matter to proceed to court if either side wants to pursue it further.