What is the limit for a security deposit on a rental in Switzerland?

The security deposit may not exceed three months' rent. The rule applies under federal tenancy law, set out in CO Art. 253 et seq. The deposit must also be placed in a blocked account in the tenant's name. The check therefore concerns both the maximum limit and the account holder, even when the tenancy is in the canton of Basel.

Do tenancy rules differ between Basel and the other cantons?

The framework indicated by the source is federal law that is the same in every canton, so the basis of the tenancy does not change when moving to the canton of Basel or another canton. However, the official cantonal form still needs to be checked when the notice of termination comes from the landlord. The national rule and the cantonal document are two levels that must be checked separately.

How can the landlord's termination notice be challenged?

The landlord's notice of termination must be contested within 30 days before the conciliation authority. Before taking action, the tenant must verify that the communication uses the official cantonal form, because the landlord's notice of termination is valid only on that form. The 30-day period is the one indicated by the source.

Who should the security deposit account be in the name of?

For the purposes of the security deposit, the account must be blocked and in the tenant's name. This requirement is in addition to the maximum limit of three months' rent: it is therefore not enough to check only the amount requested. The tenancy falls under federal law that is the same in every canton, including the focus on the canton of Basel.

Rentals in Switzerland 2026: rules and focus on Basel

Di Redazione Frontaliere Ticino · Published on 3 October 2026

Swiss residential buildings and rental rules in the canton of Basel

Security deposit, landlord's notice of termination and challenge within 30 days, with a focus on the canton of Basel and the federal framework that is the same in every canton.

Context

In brief

Rental rules: federal law identical in every canton
Security deposit: maximum 3 months' rent
Blocked account in the tenant's name
Challenge: within 30 days before the conciliation authority

Key facts

Reference → CO Art. 253 et seq.
Application → federal law identical in every canton
Security deposit → maximum 3 months' rent
Account → blocked and in the tenant's name
Landlord's termination notice → official cantonal form
Challenge → within 30 days before the conciliation authority

CO Art. 253 et seq. is the reference cited by the source for tenancy in Switzerland. The law is federal and identical in every canton: therefore, the focus on the canton of Basel does not change the legal basis of tenancy, but places it within the national comparison of the 2026 real estate market.

For anyone considering a rental, the first check concerns the security deposit. The limit is three months' rent. The amount must also be deposited in a blocked account in the tenant's name. These are two related checks: in addition to the maximum limit, it is necessary to check how the deposit is held and whose name the account is in.

The second check concerns the landlord's termination notice. The rule is formal: the termination notice is valid only if the official cantonal form is used. The reference to the canton does not negate the uniformity of federal law; instead, it indicates which official document must be checked when the landlord communicates the end of the tenancy.

The source also indicates the procedure for challenging the notice. If the tenant intends to challenge the termination notice, they must contact the conciliation authority within 30 days. The deadline should be put in the calendar as soon as the need to act arises. The practical point is the sequence: first check the form, then consider the challenge and comply with the prescribed deadline.

The distinction that prevents mistakes

In the rental market, three aspects should not be conflated. The security deposit concerns a guarantee with a maximum limit; the blocked account concerns the name in which it is held; the landlord's termination notice, on the other hand, concerns an official cantonal form and a possible challenge. Separating these steps makes it possible to assess a tenancy in the canton of Basel using the same framework applicable to the other Cantons, without confusing the federal rule with the cantonal act. The distinction helps avoid mistaking a national rule for a local formality and vice versa. To complement the legal check with the cost-of-living check, costo della vita in Svizzera can be used.

Operational details

Basel in the national comparison

To understand the practical scope of the rules, it is useful to separate what is the same in all cantons from what requires a local check. The tenancy rules indicated by the source are federal and uniform. The landlord's notice of termination, on the other hand, uses an official cantonal form. For those comparing homes in different cantons, this difference avoids a concrete error: treating the termination document as if it were a generic form valid without checks.

The deposit requires a different reading. The reference is not an arbitrary amount, but the maximum limit of three months' rent. If a proposal asks to exceed that limit, it does not match the verified rule. If the limit is respected, it remains necessary to check that the account is blocked and in the tenant's name. The comparison, therefore, does not end when the amount is read: it also concerns the structure of the deposit.

Three control scenarios

Situation
Situation	Practical check
Security deposit proposal	No more than three months' rent and a blocked account
Landlord's notice of termination	Official cantonal form
Challenge	Within 30 days to the conciliation authority

A tenant considering a tenancy in the canton of Basel can use this table as a preliminary filter. The first scenario concerns the moment when the security deposit is examined; the second comes into play when the notice of termination arrives; the third is triggered if the tenant decides to challenge it. They are not alternatives to one another: they concern different stages of the tenancy relationship.

The most useful consequence for the national comparison is that the canton does not modify the federal limit on the security deposit, but checking the form remains tied to the cantonal dimension. This criterion can also be used when the reader relates rent to the cost of living and available income. The distinction makes it possible to carry out a national check without attributing to the canton a role different from the one indicated by the rule. To read this last item in an orderly manner, the guide to busta paga svizzera is available.

Recommended tools

For an updated estimate, use the net salary calculator and the CHF-EUR exchange comparator.

Key points

Checklist for taking action

The verification can be turned into a brief procedure, without attributing rules not indicated to the cantons. The initial reference is CO Art. 253 et seq.; the source links it to a federal right that is the same in every canton. For a tenancy in the canton of Basel, proceed as follows. The objective is to turn the requirements into separate checks, so as not to miss the correct deadline.

1. Identify the applicable rule. Read the tenancy in light of the federal framework and do not look for different regulations merely because the property is located in a specific canton. 2. Check the deposit. Verify that it does not exceed three months' rent and that the deposit is placed in a blocked account in the tenant's name. 3. Examine the landlord's notice of termination. The document must use the official cantonal form. This check should be kept separate from the one concerning the deposit: they are two different steps. 4. Initiate the challenge, if necessary. The source indicates the conciliation authority as the forum and sets the deadline at 30 days. The deadline should not be allowed to elapse while trying to reconstruct the case.

How to use the checklist in the budget

The legal procedure does not replace monitoring monthly expenses. Before taking on a housing commitment, the reader can combine the deposit check with the guide on costo della vita in Svizzera and the reading of busta paga svizzera. The two tools help keep the rule on the deposit separate from the assessment of available income, without confusing the deposit check with the reading of available income.

If a termination notice arrives, the operational priority is different: check the official cantonal form, note the 30-day deadline and direct the challenge to the conciliation authority. The same sequence remains clear even in the canton of Basel, because the basis of tenancy is federal and the same in every canton.

To connect rent to available income, use calcolatore stipendio.

Frequently Asked Questions

What is the limit for a security deposit on a rental in Switzerland?: The security deposit may not exceed three months' rent. The rule applies under federal tenancy law, set out in CO Art. 253 et seq. The deposit must also be placed in a blocked account in the tenant's name. The check therefore concerns both the maximum limit and the account holder, even when the tenancy is in the canton of Basel.
Do tenancy rules differ between Basel and the other cantons?: The framework indicated by the source is federal law that is the same in every canton, so the basis of the tenancy does not change when moving to the canton of Basel or another canton. However, the official cantonal form still needs to be checked when the notice of termination comes from the landlord. The national rule and the cantonal document are two levels that must be checked separately.
How can the landlord's termination notice be challenged?: The landlord's notice of termination must be contested within 30 days before the conciliation authority. Before taking action, the tenant must verify that the communication uses the official cantonal form, because the landlord's notice of termination is valid only on that form. The 30-day period is the one indicated by the source.
Who should the security deposit account be in the name of?: For the purposes of the security deposit, the account must be blocked and in the tenant's name. This requirement is in addition to the maximum limit of three months' rent: it is therefore not enough to check only the amount requested. The tenancy falls under federal law that is the same in every canton, including the focus on the canton of Basel.