I think one of the reasons the way the IRS is enforcing income tax is because it contradicts the 5th amendment and it clearly states in the IRS code that income tax on a employees labor is optional. Something else I know about the 16th amendment is that it was suppose to be temporary and that it was targeted towards the income for a business on there goods and services not the individual employees labor. I think it's the 5th amendment that states that an individual can not incriminate himself (self-incrimination) and the 16th amendment clearly contradicts this since tax payers have to file their own taxes and that is why many people in congress did not want to ratify the 16th amendment and it was never fully ratified. This has been a big issue for a very long time and for many many years cases have been won over and over again in the Supreme Court because the Supreme Court goes by the book most court below the Supreme Court do not. Not paying your income tax is very risky but if you get charged and can take your case to the Supreme Court your safe....
I do not think that's all the detail on the matter there's a few more reason that income tax is not legal and there's a very good documentary that covers all this: http://video.google.com/videoplay?docid=-1656880303867390173&q=from+freedom+to+fascism&total=1102&start=0&num=10&so=0&type=search&plindex=0 The name of the documentary is "From Freedom to Fascism" it's a very good movie and a big eye opener.
OK that's all I have to say on the matter. I understand your scepticism and there was a point in time that I trusted the system as much as you do but once the truth is revealed it is hard to feel safe. I know I may seem paranoid but I have seen some very good documentaries that uncover some crazy things that the government has done and surprisingly there's a ton of evidence that proves it. Things have been uncovered and proven over and over again, but will never get out. Please just have an open mind to what people have to say because no matter how crazy it may seem it just maybe true because this is a sick and crazy world and people that you may think are good and looking out for your best interest are not.