Short Answer
Acting as a master tenant legally binds you to provide your subtenant with a signed housing confirmation document within fourteen days of their move-in date.
Federal registration laws categorize you as the official provider of housing, meaning you bear the absolute administrative responsibility for this certificate regardless of the property owner's involvement.
What Most Expats Don't Realize
You sublet your spare room to a fellow expat but refused to sign their official residence confirmation because you feared your primary landlord might object to the setup. Your subtenant was blocked from registering at the city hall, failed to obtain a tax identification number, and was eventually audited by the local registration authorities. Because you withheld the mandatory paperwork, the municipality issued an automated administrative non-compliance fine directly to you, resulting in a personal loss of €400.
What To Do
- Download a standard template for a "Wohnungsgeberbestätigung" (housing provider confirmation) from your local municipality's online portal.
- Bring the printed form to your subtenant and sign your name as the official "Hauptmieter" (master tenant) within their first week of occupancy.
- "Hier ist Ihre unterschriebene Wohnungsgeberbestätigung für die Anmeldung." (Here is your signed housing confirmation for the registration.) — hand this document to your subtenant to ensure statutory compliance.
The Truth
Germany’s federal registration act operates on mandatory address reporting backed by immediate financial penalties for administrative obstruction. The system positions the master tenant as a direct bureaucratic link, executing automated penalties against any renter who prevents a subtenant from updating their civil registration file.