What is the Wohnungsgeberbestätigung?

The Wohnungsgeberbestätigung (also called Einzugsbestätigung des Wohnungsgebers or Vermieterbescheinigung) is a document given by the landlord or the main tenant (Hauptmieter). This document proves that you are allowed to live at this address.

The Wohnungsgeberbestätigung is required for your address registration (Anmeldung). Without it, you can't register your address.

The main tenant can't sign this document without the permission of the landlord1, 2. This means that you can't register a place as your official address without the permission of the landlord. This also means that you can't use a hotel or an AirBnB as your official address.