The 10 most common mistakes in reducing rent

Mistake 1: cutting the rent without reporting the defect

By far the most common and most expensive mistake. Without a defect notice there is no enforceable claim, and the rent you withheld is nothing but arrears. First report in writing, then talk about reducing.

Mistake 2: reducing too much

Arrears of more than one month's rent on two consecutive dates can already trigger termination without notice (§ 543 Abs. 2 Satz 1 Nr. 3 Buchst. a in conjunction with § 569 Abs. 3 Nr. 1 BGB). And table values are ranges from individual cases, not guarantees. Stay at the lower end or simply pay under protest.

Mistake 3: calculating from the cold instead of the warm rent

The basis of calculation is the gross warm rent including all advance payments. Start from the net cold rent and you reduce noticeably less than you are entitled to.

Mistake 4: not documenting the defect

Without photos, logs and witnesses it is one word against another in court, and the burden of proving the defect lies with the tenant. Start documenting on day one, not once the dispute has arrived.

• Photos and videos with a legible date
• A temperature log for heating defects, several times a day
• A noise log with date, time from and to, type and intensity
• Note the names of possible witnesses while memories are fresh

Mistake 5: reporting only by email or in person

An email does not prove it arrived. Rely on Einwurf-Einschreiben or a messenger with a witness. Send the email as well, so the landlord finds out quickly.

Mistake 6: not setting a deadline for the remedy

Without a deadline given as a specific date you trigger no follow-on rights, neither damages nor self-remedy under § 536a Abs. 2 BGB. So: a date in the letter, not a vague period.

Mistake 7: refusing the landlord access

The landlord may inspect the defect and must be allowed to remedy it. Anyone who does not open the door after a proper announcement risks their right to reduce and ends up responsible for the delay themselves.

Mistake 8: continuing to reduce after the repair

As soon as the defect is fixed, the full rent is owed again. Keep cutting and you build up arrears. Record the day of the repair in writing and stop the reduction from then on.

Mistake 9: waiting too long

The longer you wait, the harder the proof, and in exceptional cases forfeiture under § 242 BGB looms. So do not sit on it: the defect notice should go out within a few days of discovery.

Mistake 10: fixing the defect yourself and then cutting the rent

Self-remedy is permitted only under narrow conditions: the landlord must be in default with the repair, or the repair must be urgently necessary to preserve the rented property (§ 536a Abs. 2 BGB). Repair too hastily on your own and you are left with the bill.

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