Finding a flat for your career start often means dealing with a new salary and a high rental deposit at the same time. Landlords want to know whether you can pay the rent in the long term. At the same time, the law sets clear limits on deposits (Mietkaution) that many tenants do not know.
Short answer: In Germany, a rental deposit may not exceed three times the monthly base rent (Nettokaltmiete). Advance payments for ancillary costs (Betriebskosten) are excluded (section 551 (1) BGB). You may pay the deposit in three equal monthly instalments, the first due when the tenancy starts (section 551 (2) BGB). A landlord may only ask for proof of income to the extent needed for the decision. Last updated: October 2026.
Key points
- For cash deposits, the limit is three months of base rent. Deviating agreements to the tenant’s disadvantage are void.
- You may pay the deposit in three equal monthly instalments.
- The landlord must invest a cash deposit separately from his own assets.
- For proof of income, the principle of data minimisation applies: only the information the landlord needs for the decision.
- If your job is still on a fixed-term contract, state this openly from the start.
How high may the deposit be?
If the landlord requires a cash security, it may not exceed three times the monthly rent. Ancillary costs that are shown as a flat rate or advance payment are not counted (section 551 (1) BGB). The limit therefore refers to the base rent, not to the total rent including ancillary costs.
Assumption: The base rent is 650 euros and the advance payment for ancillary costs is 150 euros. The deposit may then be at most 1,950 euros, which is three times 650 euros. The 150 euros in ancillary costs do not raise the limit.
| Item | Example (assumption) | Meaning for the deposit |
|---|---|---|
| Base rent | 650 euros | Basis for the limit |
| Advance payment for ancillary costs | 150 euros | Not counted |
| Maximum deposit | 1,950 euros | Three times the base rent |
| Instalment with three-part payment | 650 euros | First instalment at the start of the tenancy, others with the rent |
You may pay the deposit in three equal monthly instalments. At 1,950 euros, each instalment would be 650 euros. The first instalment is due at the start of the tenancy, the next ones together with the following rent payments (section 551 (2) BGB).
Which proof of income may the landlord ask for?
A landlord may form a view on whether you can afford the rent. This typically includes your employment contract, your latest payslips and a self-disclosure form. You only have to provide information that is necessary for the decision. The principle of data minimisation applies under Article 5 (1) (c) of the General Data Protection Regulation (GDPR).
- Employment contract: shows the type and duration of your employment.
- Payslips: the latest statements, so that the level of income can be checked.
- Self-disclosure: a voluntary overview of income and fixed costs.
- ID: proof of identity for checking your details.
You do not have to hand over bank statements covering long periods across the board. Usually it is enough to prove income and ability to pay. Unrelated personal data can be blacked out.
How much rent can I realistically afford?
Before you start looking, add up all fixed costs: base rent, ancillary costs, electricity, internet, insurance, travel and any loan repayments. What remains is your room for rent. This figure matters more than any rule of thumb, because it reflects your actual situation. Also plan a buffer, since the deposit is usually due on top of moving costs.
Is there an alternative to a cash deposit?
Yes. Instead of a cash payment, a rent deposit guarantee (Mietkautionsbürgschaft) from a bank or an insurer can be provided. Such security also falls under the three-month limit, because section 551 (1) BGB limits security in general. The guarantee involves costs, which you should ask the provider about. Whether the landlord accepts it is his decision, so discuss it with him early.
Why proof of income can strengthen your application
A complete and clearly arranged set of documents often looks more professional than a loose pile of papers. Present the documents in a clear order and label them briefly. If you show plainly that your income covers the rent, you need less explaining. That saves time and helps you stand out from other applicants.
What if my contract is still fixed-term or in probation?
A new job in probation often looks uncertain to landlords. Show your employment contract and explain from when your salary is fixed. A fixed-term contract should be mentioned from the start. Openness builds trust, which in flat hunting often matters more than any single figure.
How do I get my deposit back?
After the tenancy ends, the landlord must return the deposit, as far as no justified claims exist. When you move in and out, document the condition of the flat with photos and a handover protocol. A cash deposit must be invested by the landlord separately from his assets and be invested at interest (section 551 (3) BGB).
Frequently asked questions
May the landlord ask for more than three months of rent?
No. The limit applies to cash security under section 551 (1) BGB. Agreements to the tenant’s disadvantage that deviate from it are void (section 551 (4) BGB). If more is demanded, you can claim back the excess.
Does the deposit have to be held in a savings book?
Not necessarily. What matters is that the landlord invests the deposit separately from his assets and at interest (section 551 (3) BGB). The form of investment is not fixed by law alone, but it must meet these requirements.
What happens if the landlord does not invest the deposit properly?
Then he breaches his duty under section 551 (3) BGB. If you have paid the deposit, you can claim it back once the tenancy has ended. Keep the bank statement as proof of payment in case of a dispute.
What does net base rent mean?
The net base rent is the rent without ancillary costs, such as heating, water or refuse collection, insofar as these are shown as advance payments. Only this amount counts for the deposit limit.
May the landlord see my payslip?
He may ask for information about your income that he needs for the selection. There is no duty to hand over every document. Data minimisation protects you from disclosing more than the landlord needs.
How to proceed now
- Set your budget: base rent, ancillary costs and the deposit in three instalments.
- Collect the documents and decide which information you disclose.
- Check in the tenancy agreement whether the deposit stays within the limit of three base rents.
- Document the condition of the flat on move-in with photos and a protocol.
Related reading
- How to Find a Shared Flat: Tips for a Successful Search
- Career Start After University: Your Guide to the First Job
- Starting Salaries After Graduation: What Really Counts
- Finding Affordable Student Housing: Strategy, Portals and Costs (in German)
Sources: section 551 BGB (security for residential tenancies), Article 5 GDPR (principles of data processing).
Last updated: October 2026. This guide is general information, not individual advice.
