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

  1. Gross rent = net rent + monthly charges (Nebenkosten).
  2. Landlords commonly expect gross rent ≤ one third of gross monthly household income.
  3. 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.