Proclaiming yourself a Nazi shouldn't. Expect to be watched closely by intelligence services though (unless you're a cop, very different rules apply then).
Promoting the ideology may land in you in jail, depending on details (after a series of trials ending in fines because we believe in measured response).
I am not German or living in Germany, so I have to rely on secondary sources here. I understand that there are laws in Germany banning the use of Nazi symbols [1], as well as very strong laws against hate speech.
Maybe I should have said "face criminal penalties" instead of "end up in prison".
Proclaiming yourself a Nazi shouldn't. Expect to be watched closely by intelligence services though (unless you're a cop, very different rules apply then).
Promoting the ideology may land in you in jail, depending on details (after a series of trials ending in fines because we believe in measured response).