Berlin's Rental Deposit Doesn't Sit in Your Landlord's Account: The Kautionskonto, and When a Bürgschaft Beats Tying Up Cash
German law caps a Berlin rental deposit at three net cold months' rent, payable in three equal monthly installments, and requires it to sit somewhere separate from your landlord's own money, either in a Mietkautionskonto you open yourself or through a bank-arranged or insurance-backed guarantee instead of cash. Berliner Sparkasse's own version, a Mietkaution-Kündigungsgeld account on a Verpfändung (pledge) basis, needs an existing Girokonto there and is usually free for existing customers, otherwise roughly 10 to 30 EUR. Berliner Volksbank offers the same kind of savings account plus something worth comparing directly against it, the R+V-MietkautionsBürgschaft, a bank-arranged surety with no minimum term and daily cancellation. A fully digital alternative, heysafe, backed by AXA, charges 4.3 percent of the deposit sum per year, starting around 3.25 EUR a month, with online approval in about 90 seconds. Whether that annual fee beats tying up cash depends heavily on how large the deposit actually is, and Berlin's own numbers make that a real question: the CBRE/Berlin Hyp Wohnmarktreport Berlin 2026 puts the average asking rent for a new lease at roughly 15.80 EUR per square meter, which turns the legal three-month cap on a 70 square meter apartment into a deposit north of 3,300 EUR, nearly double what the same math produces against the Mietspiegel 2026's citywide median of 7.71 EUR per square meter for existing tenancies. And a Berlin landlord isn't obliged to accept a Kautionsversicherung in the first place if the lease itself doesn't list it as an option, a point Berlin's own courts have settled directly.
The Official Rule
German law doesn’t let a landlord simply take your deposit and drop it into their own account. Under § 551 BGB, a Mietkaution for a residential lease anywhere in Germany, Berlin included, cannot exceed three net cold months’ rent, you can pay it in three equal monthly installments rather than one lump sum at signing, and whoever holds it has to keep it separate from their own money and invest it at the standard savings rate, with the interest belonging to you. None of that changes city to city. What does change in Berlin is which institutions you’ll actually be dealing with, and just how much money that three-month cap can mean once you’re signing a lease at what Berlin currently asks for rent.
Berliner Sparkasse’s own product works on a Kündigungsgeld structure. You open the account yourself, but it requires an existing Girokonto with Berliner Sparkasse, and the balance gets pledged (verpfändet) to your landlord rather than handed to them directly. If your landlord ever needs to draw on it, the bank notifies you first. Opening it is generally free if you’re already a Sparkasse customer; reports on the fee for everyone else land in the 10 to 30 EUR range, though some sources cite figures closer to 40 EUR, so it’s worth asking your specific branch before assuming either number.
| Option | How it works | Indicative cost |
|---|---|---|
| Berliner Sparkasse Kündigungsgeld account | Cash deposit, pledged to landlord, requires existing Girokonto | Free for existing customers, ~10-30 EUR otherwise |
| Berliner Volksbank R+V-MietkautionsBürgschaft | Bank-arranged surety through R+V insurance, no minimum term | Ongoing fee, cancellable daily |
| heysafe (AXA-backed) | Fully digital surety, ~90-second online approval | 4.3% of deposit sum/year, from ~3.25 EUR/month |
Berliner Volksbank runs a genuine alternative alongside its own savings-account version: the R+V-MietkautionsBürgschaft. Instead of tying up cash, R+V, the insurer, stands behind the deposit obligation as a bank-arranged surety. The bank markets it specifically on flexibility, no minimum term and the ability to cancel daily, which matters if you’re not sure how long you’ll actually stay in a given lease. Since Volksbanken and Raiffeisenbanken operate regionally and independently of each other, it’s worth confirming the exact terms with your specific Berliner Volksbank branch rather than assuming every Volksbank product nationwide works identically.
If a branch visit isn’t appealing, heysafe is the fully digital option worth knowing about. Backed by AXA, one of Germany’s largest primary insurers, heysafe charges 4.3 percent of your deposit sum per year, starting from around 3.25 EUR a month for a smaller deposit, and approves applications online in roughly 90 seconds, with a digital surety certificate emailed straight to you. No branch visit, no waiting on a bank’s own internal process.
Whether any of this is actually worth it comes down to one number: how big is the deposit itself. That’s where Berlin’s own rental math matters more than the generic advice you’ll find on federal comparison sites. The CBRE/Berlin Hyp Wohnmarktreport Berlin 2026 puts the average asking rent for apartments currently listed at roughly 15.80 EUR per square meter. On a 70 square meter apartment, that’s about 1,106 EUR net cold rent a month, which puts the legal three-month deposit cap at around 3,318 EUR. Run the same calculation against the Mietspiegel 2026’s citywide median for existing tenancies, 7.71 EUR per square meter, and the same size apartment produces a deposit closer to 1,619 EUR, less than half. A newcomer signing a fresh Berlin lease at something close to that asking-rent figure is the person for whom a 4.3 percent annual fee, roughly 142 EUR a year on the larger sum, can genuinely look small next to locking away over 3,300 EUR in cash on top of a deposit, moving costs, and often a broker’s fee, all at once.
Photo by Jakub Zerdzicki on Pexels
One catch applies regardless of which option you prefer: your landlord doesn’t have to say yes to an alternative to cash. A landlord is only obliged to accept a Bürgschaft or Kautionsversicherung if the lease itself lists it as an acceptable security type. Berlin’s own courts have settled this directly. The Amtsgericht Lichtenberg ruled on August 6, 2014 (case 6 C 153/14) that a landlord could lawfully refuse a tenant’s rental deposit insurance because the lease’s own enumerated list of accepted deposit forms didn’t include it, and the Landgericht Berlin confirmed the ruling on appeal on February 4, 2015 (case 65 S 415/14). If a Bürgschaft or insurance product is part of your plan, check the actual wording of your lease, or raise it with your landlord before you sign, rather than assuming it’ll simply be accepted later.
What Real People Say
Newcomers to Berlin describe being caught off guard less by the legal cap itself and more by how much cash it actually adds up to once a listing’s asking rent, rather than the older Mietspiegel figure, is what a landlord is quoting. Between a deposit near 3,000 EUR or more, a broker’s fee where one applies, and the usual first-month moving costs, the total cash needed to move into a Berlin apartment routinely runs well past what people expected before they started looking.
The recurring piece of practical advice, across forums and tenant-focused guides alike, is to work out the real math before assuming a Bürgschaft is automatically the smarter move: a surety fee that runs every year for as long as the lease lasts can outpace what a one-time or free cash-account setup would have cost, especially for renters who expect to stay put for several years in one of Berlin’s famously long, often unlimited-term (unbefristet) leases. People who move frequently, or who need the cash freed up immediately for other newcomer expenses, tend to lean the other way.
Step by Step
- Confirm your legal maximum (three net cold months’ rent) and your right to pay it in three monthly installments before agreeing to anything else with your landlord.
- Check what your lease actually says about accepted deposit forms. If a Bürgschaft or Kautionsversicherung isn’t listed, your landlord can lawfully refuse one, so raise it before signing rather than after.
- If you want a cash account, contact Berliner Sparkasse (if you already bank there) or your local Berliner Volksbank branch for their Kündigungsgeld or Kautionssparbuch option, bringing ID, your Steuer-ID, and your lease.
- If you’d rather not tie up cash, compare a bank-arranged surety like Berliner Volksbank’s R+V-MietkautionsBürgschaft against a fully digital option like heysafe, weighing the annual percentage fee against how long you expect to actually stay.
- Run the math against your own deposit size, not a generic estimate. A deposit near Berlin’s current asking-rent tier changes the calculation meaningfully compared to one closer to the Mietspiegel median.
- Get your landlord’s written confirmation of whichever structure you choose before handing over cash or a guarantee certificate.
Compliance Note
This page explains the general legal structure and Berlin-specific options for rental deposits, but this is not legal advice, and whether a particular alternative to a cash deposit is accepted depends on your specific lease. Confirm directly with your landlord, the relevant bank or insurer, or the Mietervereinigung Berlin for your own tenancy.
FAQ & Common Pitfalls
Do Berlin landlords actually have to accept a Kautionsversicherung or Bürgschaft instead of cash?
No, and this is a genuinely common misunderstanding. A landlord only has to accept an alternative to a cash deposit if the lease itself allows it. In a Berlin case, the Amtsgericht Lichtenberg ruled on August 6, 2014 (case 6 C 153/14) that a landlord could refuse a tenant's rental deposit insurance because the lease's own list of accepted security types didn't include it, a decision the Landgericht Berlin upheld on appeal on February 4, 2015 (case 65 S 415/14). If you're planning to use heysafe, an R+V-arranged surety, or any other alternative to cash, check what your specific lease actually says before assuming it'll be accepted, and raise it with your landlord before signing if it isn't listed.
Does Berliner Volksbank's R+V-MietkautionsBürgschaft require me to already bank there?
Volksbanken and Raiffeisenbanken are regionally independent, so exact requirements can vary by branch, and Berliner Volksbank itself notes that conditions should be confirmed directly. In practice, a bank-arranged surety like this is usually easiest to set up if you already hold a Girokonto there or are willing to open one, similar to how the Kautionssparbuch savings-account option works. If you'd rather not open a new bank relationship just for this, a fully digital option like heysafe doesn't require any banking relationship with the guarantor at all.
Which actually costs less over time, a Sparkasse cash account or heysafe's annual premium?
It depends almost entirely on how big your deposit is and how long you stay. A cash Mietkautionskonto is typically a low or one-time fee (often free for existing Sparkasse customers, otherwise roughly 10 to 30 EUR), and you get the money, plus any interest earned, back in full at the end of the tenancy. A Bürgschaft like heysafe's charges 4.3 percent of the deposit sum every single year for as long as you rent, with nothing returned at the end, since it's an ongoing guarantee fee, not a savings deposit. On a 3,300 EUR deposit, that's around 142 EUR a year. Run the math against how many years you expect to stay and compare it to what tying up that cash would actually cost you elsewhere, rather than assuming either option is automatically cheaper.
If my landlord actually claims against a Bürgschaft, do I owe that money back?
Yes, and this is the part that gets glossed over in marketing for these products. A Bürgschaft or Kautionsversicherung means the guarantor, R+V or AXA in the products covered here, pays your landlord directly if a legitimate claim is made, but it isn't free money. Both providers retain the right to recover what they paid out from you afterward, exactly like a bank would if it had to release your own cash deposit. The genuine benefit is spreading that risk and freeing up your cash while you're renting, not avoiding responsibility for damages or unpaid rent you're actually liable for.
Can I switch from a cash Mietkautionskonto to a Bürgschaft partway through my tenancy, or the reverse?
You can, but only with your landlord's agreement, since the deposit structure is something you both need to be aligned on, not something you can change unilaterally. If your landlord agrees, a guarantee provider like heysafe or Berliner Volksbank's R+V product typically pays the landlord directly and takes over as the security, at which point your bank releases the cash sitting in your Kautionskonto back to you. Get the landlord's written confirmation before initiating the switch on either end.