Swiss Tenancy Law for Landlords: Notice, Rent, Deposits & Disputes (2026)

Short answer: Residential tenancy in Switzerland is governed by federal law, the Swiss Code of Obligations, Art. 253–273c (fedlex). The essentials for landlords: termination needs three months' notice on the official cantonal form, every rent increase needs the official form with reasons, deposits are capped at three months' rent, and any dispute starts at the conciliation authority where the property is located.

This guide covers each of those rules with the article references, explains how the conciliation procedure works and what it costs, and summarises the 2026 changes that affect owners.

Who Makes the Rules: Federal Law, Cantons and Municipalities

Swiss tenancy law has three layers, and many landlord questions come down to knowing which one applies.

• Federal law sets the tenancy rules themselves: notice, rent control, deposits, termination protection and lease extensions (Code of Obligations), plus the dispute procedure (Civil Procedure Code, CPC).
• Cantons approve the official forms, set customary termination dates, decide whether landlords must disclose the previous rent on a form when signing a new lease, and organise the conciliation authorities.
• Municipalities and cantons regulate how a flat may be used: zoning, housing-protection rules and short-term rental limits. For example, Geneva limits renting out a whole home on platforms like Airbnb to 90 days a year, and the city of Lucerne has capped short-term rentals at 90 nights a year since January 2025.

If you are asking whether a particular town is planning new short-term rental rules, the answer is not in the Code of Obligations. Check the municipality's building or economic affairs office and the cantonal housing department. Our Airbnb vs long-term rental guide covers the practical side.

Notice Periods and Formal Requirements

Notice periods

For residential premises, either party may terminate with three months' notice, expiring on a date fixed by local custom or, where there is none, at the end of a three-month lease period (Art. 266c CO). Leases can agree longer periods or additional termination dates. Always check your lease and the customary dates in your canton before sending anything.

The official cantonal form

Notice of termination must be given in writing, and a landlord must use the form approved by the canton, which tells the tenant how to challenge the termination or request an extension (Art. 266l CO). Two further rules trip up private landlords:

• If the flat is the family home, notice must be sent separately to the tenant and to the spouse or registered partner (Art. 266n CO).
• A notice that ignores these form requirements is void. Send it by registered mail, well before the deadline, because what counts is when the tenant can take receipt of it.

Challenges and extensions

A tenant can challenge a termination at the conciliation authority within 30 days of receiving it (Art. 273 CO). A termination can be annulled as abusive if, for example, it retaliates against the tenant for asserting claims in good faith, or comes within three years of proceedings in which the landlord largely lost or settled (Art. 271a CO).

Where termination would cause hardship, the lease can be extended by up to four years for residential premises (Art. 272b CO). No extension is granted if you terminated because of rent arrears, a serious breach of the duty of care, or the tenant's bankruptcy (Art. 272a CO).

Rent arrears

If a tenant falls behind, you can set a payment deadline of at least 30 days with a warning that you will terminate. If the tenant still does not pay, you may terminate with at least 30 days' notice to the end of a month (Art. 257d CO). The payment warning must also be served separately on a spouse.

Rent Increases and the Reference Interest Rate

How to increase rent correctly

You can increase rent with effect from the next termination date, but you must notify the increase and give reasons on the cantonal form, at least ten days before the notice period begins. An increase that is not on the form, gives no reasons, or comes with a threat of termination is void (Art. 269d CO). The tenant can challenge it within 30 days (Art. 270b CO).

The reference interest rate

Rent adjustments in existing leases are tied largely to the mortgage reference interest rate published quarterly by the Federal Office for Housing. It stood at 1.25% at the publication of 2 September 2026, unchanged from the previous quarter (BWO). When the rate falls, tenants may request a reduction; when it rises, landlords may pass on an increase. Other valid grounds for adjustment include inflation, general cost increases and value-adding investments.

Unfair rents and the initial rent

Rents are unfair if they give the landlord an excessive return (Art. 269 CO). They are generally not considered unfair if, among other things, they fall within the range customary in the locality (Art. 269a CO).

A new tenant can challenge the initial rent within 30 days of moving in, for example if it is significantly higher than the previous rent (Art. 270 CO). The new tenant is also entitled to know what the previous tenant paid (Art. 256a CO). In cantons with a housing shortage, including Zurich and Geneva, the landlord must disclose this on an official form when the lease is signed. Price new leases so that you can justify the rent.

Rental Deposits (Mietkaution): The Three-Month Cap

For residential leases, a landlord may ask for no more than three months' rent as security (Art. 257e CO). A cash deposit must be paid into a bank account in the tenant's name. The bank releases it only with both parties' consent or on a final payment order or court decision. If you bring no claim within one year after the lease ends, the tenant can have the deposit released.

Many expat tenants use a deposit guarantee from an insurer instead of a blocked account. We cover how that works in our landlord's guide to renting to expats.

Want the notices, forms, deadlines and deposits handled for you? Offlist's property management service places vetted tenants and takes over the administration of your Swiss rental.

The Conciliation Authority (Schlichtungsbehörde): Where Disputes Are Filed

Conciliation comes first

In Swiss civil procedure, a lawsuit must normally be preceded by an attempt at conciliation (Art. 197 CPC). For tenancy disputes, this is the joint conciliation authority for tenancy matters, made up of a neutral chairperson and an equal number of landlord and tenant representatives (Art. 200 CPC).

Which authority is competent

Jurisdiction follows the property: the court at the place where the property is situated decides tenancy disputes (Art. 33 CPC). The same applies to the conciliation authority. How the authorities are organised is up to each canton. Some have one authority per district, others a single cantonal commission. Your cantonal website or the court administration will list the competent office for the municipality where your property is located.

Costs and outcomes

• No court costs are charged in conciliation proceedings about residential or commercial leases, and no party costs are awarded (Art. 113 CPC).
• In disputes about deposits, unfair rents, termination protection or lease extensions, the authority can issue a proposed decision, which becomes binding if neither party rejects it (Art. 210 CPC). In money disputes of up to CHF 2,000, it can decide on request (Art. 212 CPC).
• If there is no agreement, the authority grants authorisation to proceed, and the deadline to file in court is short: 30 days in key tenancy disputes (Art. 209 CPC).

Most cases never reach court. In the second half of 2025, the conciliation authorities received 19,240 new cases; 57.9% of completed cases ended in agreement, and only 14.2% ended with authorisation to proceed to court (Federal Office for Housing statistics, as reported by muula.ch).

How to prepare for a hearing

Bring:

• The signed lease and all amendments, including the official forms you used
• Correspondence documenting the dispute (emails, registered letters and their receipts)
• Evidence for your position (photos, handover protocols, invoices, payment records, comparable rents)
• Any relevant cantonal or municipal rules

Experienced landlords often settle at conciliation with a limited concession (a partial rent reduction, a repair schedule) rather than risk a court ruling and a three-year protection period against termination.

Subletting Under Art. 262 CO

A tenant may sublet all or part of the premises with the landlord's consent. You may refuse consent only if the tenant will not disclose the sublease terms, the sublease terms are unfair compared with the main lease, or the sublease causes you major disadvantages (Art. 262 CO). The tenant remains liable to you for how the subtenant uses the property.

In practice, courts read these grounds narrowly. Repeated short-term letting on platforms without your consent is a different matter, and you can address it with a warning and, if necessary, termination. Tenants who want to leave early can also propose a solvent replacement tenant (Art. 264 CO). A clear screening process protects you here, as described in our corporate tenant screening guide.

2026 Changes That Affect Landlords

Eigenmietwert abolition. On 28 September 2025, Swiss voters approved the abolition of the imputed rental value for owner-occupied homes, expected to apply from the 2028 tax period. Owner-occupiers will in return lose most deductions for mortgage interest and maintenance. A Wüest Partner study published in early 2026 estimates that buying will be cheaper than renting in 71% of Swiss municipalities after the reform, up from 57% today, with the strongest effect in western Switzerland (watson). For landlords, this could mean slightly softer rental demand in some regions.

Lex Koller tightening. On 15 April 2026, the Federal Council opened a consultation, which ran until 15 July 2026, on tightening the rules on property purchases by persons abroad (Federal Office of Justice). The proposals would further restrict buyers from outside Switzerland. See our Lex Koller guide for the current rules.

If you are weighing whether a rental still pays after all these rules, our Swiss rental yield guide has 2026 yields by city and a worked net-yield example.

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This guide is general information, not legal advice. For a specific dispute, contact a tenancy law specialist or your landlord association.

Sources:

• Swiss Code of Obligations (SR 220), Art. 253–273c
• Swiss Civil Procedure Code (SR 272)
• Federal Office for Housing — reference interest rate and conciliation statistics