Regarding the tax thing, with the link below you can calculate the amount of taxes you will have to pay.
http://www.spiegel.de/wirtschaft/0,1518,223811,00.html
It's in German though..
Hope that helps

 

In English?

Hello,

I have the same issue. yle_terrible, thanks for the link, but it's only in German. Do you know where I can calculate my tax somewhere in English? I am speaking of around 115,000 Euros per annum in salary -- what's the tax on that? Also, will I need to speak German to be in Frankfurt or is it ok to get by with English?

 

OK, a bit of translation then
*Brutto-Arbeitslohn : gross salary (monat = monthly, jahr = yearly, check the button)
*freibetrag : free allowance - to be checked with your company
*Steuerklasse: tax class - depends on your marital status - I is for single with no children I don't know about the other classes
*Kirchensteuerpflichtig: religion tax - that's your personal choice (ja is yes, nein is no)
* bundensland : county - for regional taxes - frankfurt is in Hessen
*Krankenkasse : health insurance - gezetl is public insurance , privat is private - check with your company
Rentenversicherungspflicht : pension tax - answer should be yes
Kinderfreibeträge und Kinder : depends on how many children you have - you get an allowance per child

Regarding the language : no you don't 'need' to speak german in Frankfurt, I know plenty of people who can hardly say hello in german..in shops, restaurants, trains, movies, etc, everyone speaks english.
But of course it's a completely different experience if you can speak the local language.

Hope that helps!