The 3× rule in detail
The Swiss Tenancy Act doesn't legally mandate the 3× rule, but it's the industry standard. Banks use it for mortgage affordability; landlords use it for rental affordability. The reasoning: 33% of net income on rent leaves enough buffer for living costs, savings, and taxes.
Income calculator by apartment size (Zurich 2026 averages)
| Apartment | Avg gross rent | Net income needed (3×) | Annual gross equivalent |
|---|---|---|---|
| 1.5-room studio | CHF 1,800 | CHF 5,400/mo | ~CHF 84,000/yr gross |
| 2.5-room | CHF 2,300 | CHF 6,900/mo | ~CHF 108,000/yr gross |
| 3.5-room | CHF 2,800 | CHF 8,400/mo | ~CHF 130,000/yr gross |
| 4.5-room | CHF 3,500 | CHF 10,500/mo | ~CHF 165,000/yr gross |
(Gross ≈ net + ~25% for Swiss social insurance + tax. Zurich tax rate varies; rough rule of thumb.)
Exceptions and lenient landlords
- 2.5× for singles with strong dossiers: some smaller landlords accept this if the candidate has perfect references, clean Betreibungsauszug, and stable employment (3+ years at the same company)
- Co-signer (Solidarbürge): if you're under the threshold, a parent or partner can co-sign · landlord runs both incomes through the rule
- Family aggregation: married couples typically have both incomes counted · domestic partners (Konkubinat) sometimes need to provide proof of common residency
- Self-employed: most landlords want 2 years of tax returns + an AHV-confirmation that you're paying social insurance. Some require 3 years.
What to do if you're below the threshold
- Apply with a co-signer. The most common workaround.
- Show savings. If you have CHF 50,000+ in liquid savings, attach a bank statement · some landlords weight this against income gap.
- Offer pre-payment. Some landlords accept 3-6 months prepaid rent in lieu of strict 3× income.
- Look in cheaper neighbourhoods. Aussersihl, Altstetten, Schwamendingen are 20-30% below the citywide average · the 3× rule scales accordingly.
- Consider WG (shared apartment). Splitting a 4.5-room with roommates effectively halves your per-person rent.
How aptari helps
aptari builds the income rule right into your Match Score: the closer your income is to three times the rent, the higher that part of your score. So before you apply, you see at a glance whether a listing is a comfortable fit or a stretch, and why. That way you spend your energy on the flats you can actually get, instead of guessing. You search one open feed (aptari, Homegate, ImmoScout24 and Flatfox), apply with one click using your Tenant Passport, and on Ultra the AI Agent applies for you to listings you fit.
See the Zurich city page for rent ranges by neighbourhood.