Stefan :
1.
I see your point

. And nobody said anything about anybody beeing stupid.
But you are writing on a " VERY " American board and even international board.
Then another time, just write incl. German VAT if you give out prices, then we all know what you are talking about.
Should I give out prices incl. Danish sales tax which is 25%, who
should benefit from that ???
A S 500 with not too many extras here in Denmark, cost €/$ 300.000,00 incl. tax, what can you use that information for, other
than, good I am not living there.
Tax or VAT is your local " PROBLEM ", live with it or do something about it.
I stay in Denmark because of the nice weather and the worlds highest taxes.

.
What's your excuse for staying in Germany ???
2.
Where I right about the TÜV, or am I stupid.