Rental deposit in Switzerland: blocked account or guarantee?

Signing a Swiss lease means producing a deposit — usually the single biggest cash demand of the whole move. You have two ways to cover it: park the money in a blocked bank account, or pay an insurer a yearly premium to guarantee it for you.

One of these is cheaper, the other keeps your cash free. This guide gives you the legal frame, an honest comparison, and the cases where each option actually makes sense.

The rules first

Swiss tenancy law draws clear lines around residential deposits (Art. 257e of the Code of Obligations):

• The cap is three months’ rent. A landlord cannot require more as security for a residential lease.
• The money stays yours. A cash deposit must be placed in a bank account in the tenant’s name — a dedicated Mietkautionskonto. The landlord never holds your deposit personally.
• Release needs both sides. At the end of the tenancy the bank releases the deposit with the landlord’s consent, after any justified claims (damage, unpaid charges) are settled.

Anything that deviates from this pattern — “transfer the deposit to my private account”, “pay before the contract is signed”, payment to an account abroad — is not how Switzerland works and belongs in the scam guide.

Your two options, honestly compared

The legal frame: For residential leases the landlord may not require security exceeding three months' rent; a cash deposit must be placed in a bank account in the tenant's name (Swiss Code of Obligations, Art. 257e). Art. 257e CO

Option	What it costs	Provider
Bank blocked account (Mietkautionskonto) Cheapest overall	No insurance premium — the money stays yours and may earn minimal interest, but is locked until the lease ends and the landlord releases it	Ask any Swiss bank for a “Mietkautionskonto”
SwissCaution Insurance	Annual premium via online calculator (not published as a flat rate); −10% under age 26 and −10% loyalty discount from the 2nd year; 24/7 HomeAssistance included Market range for rental guarantees is commonly around 4–6% of the deposit per year — confirm the exact premium in the provider's calculator	SwissCaution
Firstcaution Insurance	From CHF 8/month, payable monthly or annually pro rata; FINMA-authorised Swiss insurer Provisional certificate for rental applications	Firstcaution
goCaution Insurance	From CHF 94.50 per year including stamp duty (deposit-dependent, max CHF 30,000); tied agent of ProTect Insurance	goCaution

The structural difference: with a blocked account your money sits locked but remains your asset and comes back at the end. With a rental guarantee you keep the cash, but the premium is a real cost — paid every year, never refunded, and if the landlord ever draws on the guarantee, the insurer reclaims that amount from you. A guarantee is deferred liquidity, not insurance against owing the money.

How the blocked account works, step by step

1. After the lease is signed, the landlord or agency names the deposit amount (one to three months’ rent).
2. Open a Mietkautionskonto at a Swiss bank — most banks open one quickly once you have a lease; ask for a “rental deposit account / Mietkautionskonto”. It is opened in your name, tied to the lease.
3. Transfer the deposit and hand the bank’s confirmation to the landlord. That confirmation is what they actually need — not your cash in their hands.
4. At move-out, after the handover protocol is settled, both parties sign the release and the bank returns the money (plus whatever minimal interest accrued) to you.

Total cost over the whole tenancy: essentially zero. That is why the blocked account is the default recommendation whenever the cash is available.

When a guarantee genuinely makes sense

If freezing up to three months’ rent would mean real hardship — you just relocated, you’re bridging overlapping rents in the priciest markets like Zurich, Geneva and Zug, or the cash needs to cover furniture and surprises — a rental guarantee keeps that money free for a yearly premium. Some providers also issue a provisional certificate you can attach to applications (Firstcaution offers one), signalling the deposit is solved before you sign.

The trade-off is cost: the premium is paid every year and never refunded, so over a multi-year tenancy it adds up to a meaningful share of the deposit — money a blocked account would have given back. A sensible hybrid is to start with a guarantee when cash is tight, then switch to a blocked account later and stop paying.

The full picture — what it really costs, the providers compared, and the “zero-deposit” catch — is in the rental deposit guarantee guide; to put your own numbers on it, use the deposit calculator. Nothing locks you into the guarantee forever.

Decision in one paragraph

Cash available and no competing emergencies → blocked account, full stop — it is the cheapest option and reads as financially solid in your dossier. Cash genuinely tight, or you need a provisional certificate to strengthen applications → guarantee now, blocked account later. Whatever you choose, decide before you apply: “deposit plan: ready” is one of the boxes the dossier check scores, because agencies notice applicants who can sign without delay.