You can check taxes for yourself. Here's a quick link in English that correctly calculates taxes based on tax class, and has a short explanation about different factors.

EDIT: Sorry, the missing link is http://www.parmentier.de/steuer/steuer.htm?wagetax.htm

Also, if you would like to see what is an employers overhead over a given gross salary, this link (German only) can also help: http://www.brutto-netto-rechner.info/gehalt/gehaltsrechner-a...