if you google for "doing business in luxembourg" you will come up with the 'chambre d'commerce' and on page 9 of chapter 6 this link:
http://www.cc.lu/docdownload.php?id=1016
there's a table from where i got the 25%, assuming that the amount stated in the first colum is the yearly income. (i'm sorry, i couldn't find the union-jack-english-language-button on the site).
thanks for alerting me on the loss-of-social life issue, but actually all my social life will fit in the 10/11 off-days....
... easily.
now tell us, is there a different per diem for different places or why did you end up with an average 800€?
