6 Rent Reduction Mistakes Tenants in Germany Should Avoid

Why Do Rent Reductions Go Wrong So Often?

Mietminderung (rent reduction) is a powerful tenant right in Germany – but if you implement it incorrectly, you risk eviction due to rent arrears. This is especially true for expats who are used to different rules from home. Here are the most common mistakes and how to avoid them.

Mistake 1: Not Documenting the Defect

Without evidence, you'll be in a weak position in case of a dispute. In the worst case, the landlord simply denies the defect ever existed.

How to do it right:

• Take photos and videos with dates
• Measure and describe the affected area
• Name witnesses if possible
• Measure and log room temperature (for heating problems)

Mistake 2: Not Telling the Landlord

Under § 536c BGB (a section of the German Civil Code), you must inform the landlord about the defect without delay. If you fail to do so, you lose your right to a reduction for the period until you report it – and may even become liable for damages.

How to do it right:

• Written defect notice by registered mail (Einschreiben) or email with read receipt
• Describe the defect precisely and attach photos
• Set a deadline for remediation (typically 14 days)
• Write the letter in German – landlords and courts in Germany expect correspondence in German. Our service generates the letter in German for you, so you don't need to draft it yourself.

Mistake 3: Withholding Too Much Rent

If you reduce your rent by 50% when only 10% would be appropriate, you risk rent arrears. If the arrears exceed one month's rent on two consecutive due dates (or reach two months' rent in total), the landlord can terminate without notice (fristlose Kündigung, § 543 BGB) – the single biggest risk of getting a rent reduction wrong.

How to do it right:

• Use comparable court rulings as guidance
• When in doubt, reduce slightly less rather than too much
• Alternative: pay the full rent under reservation and reclaim the difference later

How this can end in practice: court cases in which tenants lost their apartment after deducting too much.

Mistake 4: Not Setting a Deadline for Repairs

Many tenants inform the landlord but forget to set a specific deadline for remediation. The reduction itself does not require a deadline – it applies from the moment you report the defect. But only once the deadline has passed is the landlord in default, and only then can you claim damages or have the defect fixed yourself (§ 536a BGB).

How to do it right:

• Set a reasonable deadline (usually 14 days)
• For urgent defects (no hot water, burst pipe): shorter deadline or demand immediate action
• Point out that the rent is reduced from the date of your notice

Mistake 5: Paying Full Rent for Too Long

Some tenants pay the full rent for months despite a defect – out of fear or ignorance. While this isn't "wrong" in a legal sense, you're leaving money on the table.

How to do it right:

• Pay under reservation (unter Vorbehalt) – write "Zahlung unter Vorbehalt der Rückforderung wegen Mietmangel" (payment under reservation of reclaim due to rental defect) in the bank transfer reference
• Reclaim overpaid rent retroactively – the right to reclaim expires after 3 years

Mistake 6: Relying on Phone Calls Instead of Writing

Verbal agreements are hard to prove. In case of a dispute, it's your word against theirs – and a friendly phone chat with the property manager counts for nothing in court.

How to do it right:

• Keep all communication in writing
• Use emails or registered mail
• If a phone call takes place: summarize the content in writing and have the landlord confirm via email

Summary: Document, report in writing (in German), set a realistic deadline, reduce appropriately. Follow these four basic rules and you're on solid legal ground. If you're unsure, a Mieterverein (tenant association – a membership organization offering affordable legal advice to renters) can double-check your case.