From another forum I quote at the end of last year there has been an amendment to the motor vehicle tax law. Since December 5, 2012 (in force since December 12, 2012) the FA has to take over the registered vehicle type and to classify it accordingly. § 2 Definitions, participation of the traffic authorities 1. Vehicles within the meaning of this law fall under the concept of vehicles and motor vehicle trailers. 2. Unless otherwise specified by this law, 1. 2. for the assessment of pollutant, carbon dioxide and noise emissions, other assessment bases of a technical nature as well as of vehicle classes and construction types, the findings of the registration authorities are binding. Accordingly, the FA may no longer tax a truck as a passenger car only because it looks like this from inside and/or outside (window, missing partition etc.). Since 12.12.12, the term “unreal motorhome” has been deleted, especially since there was already only a vehicle tax law, but never in the vehicle regulation, although some aaS had meant that. Therefore, all those who had previously had a different tax than those stated in the vehicle documents have to pay attention. In the forum contributions it can be read that tax advantages can arise for: * so far car tax as “unreal motorhome”, but actually camper (diesel engine) * so far car tax, but actually trucks but also disadvantages are possible for: * so far truck tax, but actually car * so far car tax as “unreal motorhome”, but actually residential mobi l (Benzinmotor) The tax office can and will apply the amendment of the motor vehicle tax law retroactively and is apparently also authorized to do so. Certainly, one is well advised if one already plans these possible additional costs and put aside a little money for the reclaim.