The Right to Pay Your Cologne Deposit in Three Installments, Confirmed by GAG's Own FAQ

The Official Rule

A Cologne landlord asking for the full deposit, often the maximum three months’ cold rent, in a single transfer before handing over the keys is common enough that plenty of tenants assume it’s mandatory. It genuinely isn’t, and the two protections involved are worth separating.

First, the deposit amount itself has a hard ceiling. Under Section 551 BGB, Germany’s civil code, a landlord cannot demand a security deposit exceeding three times the monthly cold rent, the base rent excluding utility advances. Any clause asking for more simply isn’t enforceable, in Cologne or anywhere else in the country.

Second, and separately, every tenant has the legal right to pay that capped deposit across three equal monthly installments rather than in one lump sum. The first installment falls due at the start of the tenancy, together with the first month’s rent, not on the day you sign. The remaining two installments follow, one with each of the next two months’ rent.

A lease clause trying to override this doesn’t hold up. A landlord cannot lawfully exclude the installment right in the contract or make key handover conditional on the full amount arriving upfront. If a lease does contain such wording, it’s simply invalid, no individual court challenge is required for it to lose effect.

Cologne’s Largest Landlord Confirms It

It’s one thing to read a federal statute. It’s another to see the city’s own biggest landlord state the same rule in plain language to its own tenants.

GAG Immobilien AG’s own tenant FAQ states that a deposit “besteht in der Regel aus bis zu 3 Kaltmieten,” typically up to three cold rents, matching Section 551’s cap exactly. GAG is Cologne’s largest landlord, “Kölns größte Vermieterin,” with more than 45,000 apartments and roughly 3.2 million square meters of space, housing an estimated 100,000 people across the city, founded in 1913 and still one of the first names newcomers hear when apartment hunting in Cologne.

The same FAQ page confirms GAG places deposits “auf einem separaten Konto mit einer 3-monatigen Kündigungsfrist sowie dem üblichen Zinssatz,” a separate account with a three-month notice period and the standard interest rate, which is precisely what Section 551 Abs. 3 BGB requires of any landlord holding a cash deposit. Whether you’re renting from GAG, one of its WBS-designated units, or a private landlord across town, the underlying legal floor doesn’t change.

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What This Actually Costs at Today’s Rents

The three-times-cold-rent cap is a fixed formula, but what it actually adds up to depends entirely on the rent you’re signing for, and Cologne’s own current market makes the difference concrete.

According to ImmoScout24’s tracking of Cologne rents, the citywide average reached about 13.14 EUR per square meter in the first quarter of 2026, up roughly 4.95 percent year over year, and up to around 15.96 EUR per square meter in the city center. On a standard 70 square meter apartment, that stretches the maximum legal deposit from around 2,760 EUR at the citywide average to more than 3,350 EUR in the priciest central blocks, real figures that make a genuine difference to whether a family can afford to move in that same month or has to wait for savings to catch up.

Where the Deposit Money Actually Sits

Section 551 Abs. 3 BGB doesn’t just cap the deposit and offer installments, it also requires a landlord to keep the money separate from their own assets, generally in an interest-bearing account.

In Cologne, Sparkasse KölnBonn, the region’s dominant retail bank, is a common destination for these accounts, but the bank’s own site draws an explicit distinction worth knowing: a Vermieterkonto is a landlord’s everyday account for managing rental income and expenses, while a Mietkautionskonto is the separate account where tenant deposits are actually deposited, “auf welches Mietkautionen hinterlegt werden.” The two are not the same product, and a tenant who wants reassurance that their deposit isn’t simply sitting in their landlord’s general business account has a specific, reasonable question to ask.

What Real People Say

Tenant guides and forum discussions about moving into a new Cologne apartment describe the same recurring surprise: most renters simply wire the full deposit at once because the landlord’s request implies it’s required, without knowing the installment right exists at all. The tenants who do use it describe a simple process, a short written note stating the intent to pay in three installments, and then treating each one with the same punctuality as rent, since the two-month arrears threshold for termination is real.

Seeing GAG, Cologne’s own largest landlord, spell out the same deposit cap and account rules in its public FAQ tends to reassure newcomers that this isn’t an obscure legal loophole; it’s simply how deposits are supposed to work here, whether the landlord is a public company or a private individual.

Step by Step

1. Confirm the total deposit doesn’t exceed three months’ cold rent, that cap applies regardless of what your contract says or who your landlord is.
2. Notify your landlord in writing that you intend to pay in three installments, this doesn’t require their approval.
3. Pay the first installment at the start of the tenancy, alongside your first month’s rent, not before.
4. Pay the remaining two installments in the following two months, each alongside that month’s rent.
5. Ask which account your deposit sits in, particularly if your landlord uses Sparkasse KölnBonn, to confirm it’s a Mietkautionskonto and not a general business account.
6. Treat every installment as seriously as rent itself, falling two months’ rent behind on the deposit can trigger the same grounds for extraordinary termination.

Compliance Note

This page explains the general federal deposit cap and installment right, along with how Cologne’s largest landlord describes its own practice, but it is not legal advice. For your specific lease, confirm the exact terms with a tenant association (Mieterverein Köln) or a lawyer specializing in Mietrecht.