Swiss Rentals 2026: Deposit & Notice in Aargau

Context

In brief

• Uniform federal rules in every canton
• Deposit: maximum three months' rent
• Blocked account in the tenant's name
• Notice of termination: official form and 30 days

Key facts

• Applicable law → CO Art. 253 et seq.
• Security deposit → maximum three months' rent
• Account → blocked and in the tenant's name
• Landlord's notice of termination → official cantonal form
• Challenge → within 30 days, conciliation authority

The key point for Aargau

Three months' rent is the maximum amount for the security deposit in Swiss leases. For anyone looking for housing in the canton of Aargau in 2026, this is the first rule to check: the legal reference is the CO, Art. 253 et seq., and the rules are federal and the same in every canton.

The security deposit must be placed in a blocked account in the tenant's name. This figure should not be confused with the monthly rent: it concerns the security provided for in the lease. The limit therefore makes it possible to check that the required security remains within the national threshold, without confusing it with the rent.

The second check concerns the end of the tenancy. When the notice of termination comes from the landlord, it is valid only if it is drawn up on the official cantonal form. The rules are therefore federal, while the required form is cantonal. If the tenant intends to challenge the notice of termination, they must contact the conciliation authority within 30 days. The deadline should be noted immediately, because the source sets the challenge period at this deadline.

For a housing search in Aargau, the national comparison does not change these points: the security-deposit limit remains the federal one, and the landlord's notice of termination requires the official cantonal form. The deposit and the account follow the same framework throughout Switzerland; the territorial specificity indicated by the rule concerns the official form associated with the notice of termination. Comparing offers therefore does not alter the tenant's basic rights.

The framework offers three reference points for understanding a tenancy: the federal law under the CO, the limit of three months' rent, and the official cantonal form for the landlord's notice of termination. These are separate reference points: the first defines the framework, the second concerns the deposit, and the third concerns the form of the notice of termination. In the event of a challenge, the relevant authority is the conciliation authority and the time window is 30 days.

Operational details

A complete housing budget does not consist solely of rent. When comparing a home in Aargau with a solution in another canton, the most useful distinction is between the guarantee linked to the contract and the recurring costs related to insurance, taxation, and work.

The budget beyond rent

LAMal/KVG is mandatory for residents and must be taken out within three months of arrival. It is private insurance with per-capita premiums, not a tax or a salary contribution; premiums depend on the canton and region, and premium reduction is a cantonal subsidy. To compare costo della vita in Svizzera, this item must be kept separate from the rental deposit. Those who need to find their way among insurers can also consult the LAMal/cassa malati guide.

Taxation also follows a three-level structure: direct federal tax, cantonal tax, and municipal tax. Each canton has its own law and multiplier; the municipality applies a multiplier to the cantonal tax. AFC/ESTV is responsible for direct federal tax and VAT, while cantonal administrations handle the cantonal and municipal levels. When budgeting for a rental in Aargau, confusing these roles leads to seeking information from the wrong authority.

| Item | Rule to consider | | Work | No federal minimum wage; some cantons have their own. | | AVS/AHV | AVS/AI/IPG: 5.3% paid by the employee; 10.6% in total with the employer. | | LPP/BVG | On the coordinated salary: 7% between ages 25-34, 10% between 35-44, 15% between 45-54, 18% from age 55 up to the reference age. | | AD/AC | 1.1% up to the annual maximum. |

These elements do not change the federal rental rule, but they help calculate what really remains after mandatory items. Comparing cantons, therefore, is not only about housing availability: it requires separating the deposit, premiums, taxes, and salary deductions.

Useful planning tools

To estimate your pension strategy, use the pension planner and the pillar 3 simulator.

Key points

Four checks before signing

The practical procedure can be organized into four steps, without confusing rent, insurance and taxes.

1. Check the deposit. Compare the requested deposit with the limit of three months' rent and verify that a blocked account in the tenant's name is provided for.

2. Check the termination notice. If it comes from the landlord, verify that it is drawn up on the official cantonal form. If you intend to contest it, contact the conciliation authority within 30 days.

3. Sort out LAMal. If you are resident in Switzerland, consider the insurance obligation and, from the date of arrival, the three-month deadline for taking out coverage. Premiums are per capita and vary by canton or region; premium reduction is a cantonal subsidy.

4. Reconstruct the budget. Separate direct federal tax, cantonal tax and municipal tax. For direct federal tax and VAT, the reference is AFC/ESTV; cantonal administrations are responsible for cantonal and municipal taxes. On the tax side, you can supplement this with dichiarazione delle imposte.

Checking the areas of responsibility also avoids a frequent mistake: UFAS/BSV concerns social security, AVS/AI/LPP, and does not set taxes; UST/BFS produces statistics and does not establish tax rates. The framework remains distinct from the rules governing tenancy agreements, which have a federal basis.

For those who live or work in Switzerland, the final check consists of lining up deadlines and items: three months' rent as the deposit ceiling, 30 days to contest the landlord's termination notice and three months from arrival to take out LAMal. These are different deadlines, relating to different matters; keeping them separate makes the practicalities of a new home in Aargau easier to understand.

To estimate the monthly margin after salary and taxes, use calcolatore stipendio/imposte.