http://www.llv.li/amtsstellen/llv-ap...atsbuerger.htm
@Harrie Nak - there are several members on here who live in SG/GR who work in FL. Liechtenstein has a currency and customs treaty with Switzerland and for most day-to-day purposes it's as good as.
A Liechtensteiner told me a couple of weeks ago that Malbun (FL's only resort) was the "best ski resort in all of Switzerland"... Another commented on a discussion about minority languages, saying how "it's like us, with Romansch".
However it is true that FL tax and social security are sufficiently different (particularly concerning international agreements) that you can't generalist about FL from Swiss law.
I used the treaties as an example to show how similar the two countries are - leading on to how FL is full of Swiss-domiciled Grenzgänger, who deal with FL's rules. I wasn't pointing to switzerland for tax details, as the analogous "home country" for the op is Germany. And sure there's another forum for that
Talk with the German officials...