What about Article I, Section 8 of the US Constitution, which reads, in part, "The Congress shall have power to lay and collect taxes..."?Wow, great link, thanks!
Be sure to watch
America: Freedome to Fascism.
It's an amazing documentary on the laws of taxation.
Did you know that there is no Federal law actually stating you must pay tax?
Did you know that the Federal Reserve is not owned by the US Government?