Rent affordability & deposit calculator
Check any Swiss apartment against the one-third income rule and calculate the legal 3-month rent deposit cap (CO Art. 257e).
Direct answer
Swiss property managers (Verwaltungen) require gross monthly rent (net rent plus ancillary charges / Nebenkosten) not to exceed one third (33.3%) of household gross monthly income. Under Art. 257e of the Swiss Code of Obligations, a residential security deposit (Mietkaution) cannot exceed 3 months' rent.
Key statutory figures & facts
- •Affordability benchmark: Gross rent ≤ 33.3% (1/3) of gross monthly household income
- •Required income formula: (Net rent + Nebenkosten) × 3
- •Statutory residential deposit cap: Max. 3× monthly rent (CO Art. 257e para. 2)
- •Deposits must be held in a blocked bank account in the tenant's name
How it's calculated
- Gross rent = net rent + monthly charges (Nebenkosten).
- Landlords commonly expect gross rent ≤ one third of gross monthly household income.
- Maximum residential deposit = 3 × monthly net rent (CO art. 257e).
Assumptions
- The one-third rule is an industry underwriting convention across Swiss property agencies, whereas the 3-month deposit cap is federal law.
Frequently asked questions
- How much income do I need to rent a CHF 2,500 apartment in Switzerland?
- At CHF 2,500 gross rent per month (including Nebenkosten), Swiss property agencies typically require at least CHF 7,500 gross monthly household income (CHF 90,000 per year).
- What is the maximum rental deposit allowed by Swiss law?
- For residential leases, Art. 257e para. 2 of the Code of Obligations caps the security deposit (Mietkaution) at a maximum of three months' rent.
- Can a Swiss landlord keep my rent deposit in their own bank account?
- No. Under CO Art. 257e para. 1, any cash or bank security deposit must be placed in a blocked savings or custody account (Mietkautionskonto) in the tenant's name at a bank.