Hi all,
I came across this nice forum and would like to get advice from you.

after working for 4.5 as a GC, I got my NE in 2005 and since then I stopped working and decided to study, so I did my MBA and now doing my doctorate. I financed my study from my savings.

I was not working all this time but I didn't register in AA, I forgot about tax and didn't file my taxes since 2005. what are the implications of this, is it required that I do something about it ? shall I file taxes since 2005 or only 2008 or not at all? can any one give me advice on this? many thanks..

If you had no income since 2005, I don't think that
you need to file taxes for all those years.

It's called "Lohnsteuererklärung" and in your case you had no "Lohn"...

thanks AxEnNeSo for your prompt reply, do I need to submit the forms and return back my empty Lohnstuerkarte.

No you don't.