In Germany, the objective rental value of a property is generally determined on the basis of the so-called rent index. If this cannot be used or is not available, the correct value can be determined by means of a well-founded and sworn expert opinion, information from a rental database or simply on the basis of the rents of at least 3 comparable apartments. In principle, each method is equivalent.
The BFH has therefore clarified that the determination of the local market rent on the basis of the rent index serves precisely to obtain an objective assessment of value. The rental index is one of the sources of information that enable a simple and quick determination of the local market rent on the basis of a wide range.
Source: Federal Fiscal Court (BFH), judgment of February 22, 2021.