Renting in Switzerland: security deposit rules 2026
Practical guide to rental rules in Switzerland and Aargau for 2026: maximum limit of three months' rent, blocked account, and contractual checks.
Context
In brief
- Security deposit: maximum three months' rent
- Blocked account in the tenant's name
- Tenancy law: federal and the same in all Cantons
- 2026 focus: rental market in the canton of Aargau
Key facts
- Scope → CO Art. 253 et seq. and federal tenancy law
- Deposit → maximum three months' rent
- Guarantee → blocked account in the tenant's name
- Comparison → Switzerland and the canton of Aargau
The key point for those looking for a home
Three months' rent represent the limit for the security deposit provided for renting in Switzerland. The amount must not be confused with the monthly rent: it is a guarantee linked to the contract and must be placed in a blocked account in the tenant's name.
The reference indicated for this matter is CO Art. 253 et seq. The rules are federal and the same in every Canton. For anyone considering an apartment in Aargau, this means starting from the same basic rule applied in the national comparison, without looking for a different maximum simply because the contract is in that Canton. The cantonal origin of the offer does not change this initial check.
The rule is practical even when preparing the budget. If the monthly rent is the amount stated in the offer, the guarantee limit is obtained by multiplying it by three. To perform the check, there is no need to convert the limit into a fixed figure: it is enough to compare the result with what is requested in the contract. If the requested amount exceeds three months' rent, it exceeds the limit set for the deposit.
The 2026 real estate market, however, requires a clear distinction. The deposit cap is not a cantonal average price and does not make it possible to determine the level of rents in Aargau. It serves to check one item of the tenancy. To read costo della vita in Svizzera, the rent and the guarantee must therefore be recorded as separate elements.
The statistical comparison must also be kept on the correct level. UST/BFS is associated with statistics; this function must not be confused with the contractual rule concerning the blocked account. Those looking for market data can thus distinguish between a measurement of the sector and a right applicable to the tenancy relationship. The same criterion avoids presenting the deposit limit as an indicator of rents. This separation is useful in Aargau as in the other Cantons.
Operational details
Aargau and national comparison
The same federal rule makes legal review comparable, but it does not automatically turn the real estate market into a single price list. The security-deposit limit concerns one item in the contract; comparing average prices by canton, on the other hand, requires a separate statistical analysis. For Aargau, the practical question is therefore twofold: what rent is stated and what security is required?
Four checks without confusing the items
| Item | Applicable rule | Practical check |
|---|---|---|
| Security deposit | Maximum three months' rent | Calculate the ceiling based on the stated rent |
| Security account | Blocked and in the tenant's name | Verify the account holder and restriction |
| Legal basis | CO Art. 253 et seq.; federal law is the same in every canton | Use the same checklist for Aargau |
| Market data | UST/BFS: statistics | Separate statistical figures from contract terms |
A tenant comparing two offers, one in Aargau and one in another canton, can apply this checklist before considering any ancillary calculation. If the rent changes, the maximum security limit changes as well, because the ceiling is expressed in months' rent and not as a fixed amount. If the canton changes, however, the federal rule applicable to the deposit remains the same. The comparison does not, however, authorize turning the limit into an estimate of the average price.
Housing costs affect the cost of living, but the overall budget should not be attributed to a single office. Responsibilities are separate: AFC/ESTV handles direct federal tax and VAT, the cantonal administrations handle the cantonal and municipal levels, and UST/BFS handles statistics. These responsibilities are distinct from those concerning tenancy. The minimum wage, moreover, is not federal: some cantons have their own. This fact may be relevant when assessing the sustainability of the budget, but it does not change the maximum deposit or the name on the account. For more information on the bank transfer, conti bancari in Svizzera are available.
Recommended tools
For an updated estimate, use the net salary calculator and the CHF-EUR exchange comparator.
Key points
Operational checklist for the contract
Before signing
The check can be carried out in a few steps, without replacing the comparison of prices with a comparison of the security deposit. The document to read is the lease agreement, and the items to isolate are rent, security deposit, and escrow account.
1. Identify the monthly rent stated in the offer or contract. This is the basis for calculating the limit expressed in months' rent. 2. Calculate the maximum by multiplying the rent by three. If the requested security deposit exceeds three months' rent, the request exceeds the applicable limit. 3. Check that the deposit is linked to an escrow account held in the tenant's name. The verification concerns both the account restriction and the name shown. 4. Apply the same checklist if the property is located in Aargau or another canton: the federal framework governing leases is the same in every canton. 5. Keep market data separate from the security deposit. The UST/BFS statistics help interpret the comparison, while the contract indicates the items of the individual tenancy.
The most useful step is to enter three data points in your comparison sheet: monthly rent, required deposit, and an indication that the escrow account is held in the tenant's name. This way, an average cantonal price is not confused with a security deposit calculated in months' rent. The sheet also helps compare an offer in Aargau with another without attributing a different maximum to the canton.
The notice of termination should be read separately from the security deposit and dealt with through the available contractual documentation. The three-month rule concerns the deposit: it should not be used to derive deadlines or other conditions for termination. To complete the monthly budget, rent and security deposit can be considered alongside your income situation, keeping the cost of living, taxes, and other personal items separate. To relate the rent to your monthly disposable funds, use calcolatore stipendio/imposte.
Frequently Asked Questions
- What is the maximum limit for the security deposit in Switzerland?
- The maximum security deposit limit for rentals in Switzerland is three months' rent. The sum must not be confused with the monthly fee and is a guarantee linked to the contract, regulated by the Code of Obligations in articles 253 et seq. This federal regulation is the same in each canton, including the canton of Aargau, and allows the maximum ceiling to be calculated simply by multiplying the monthly rent indicated in the offer or contract by three.
- In whose name should the account for the rental guarantee be?
- The security deposit must be placed in a escrow account in the tenant's name. Before signing the contract, you must verify both the bank constraint and the exact name on the account to ensure that it complies with applicable federal lease regulations.
- How do the UST/BFS statistics relate to the lease agreement?
- The statistics published by UST/BFS are used to measure the sector and read the market comparison, but should not be confused with the contractual rule on the escrow account or with the deposit limit. Market data seekers must clearly distinguish between statistical measurement of the sector and the law applicable to the individual lease relationship.