Irwin Schiff wrote the underground bestseller book Federal mafia - How the government illegaly imposes and unlawfully collects income taxes (2000), which proves you that paying any income tax in USA is completely voluntary. In other words: you don't need to pay anything at all. The american Internal revenue service (IRS), which is a completely private company, is conducting a giant robbery on american citizens, seizing their property and sending them to jails. But now millions of americans are becoming aware of it and simply don't pay their taxes anymore, none of it is ever reported by mainstream media. It's very likely that the same is done in other countries across the globe. Over 300 pages, with many legal documents. A must read for everyone.

From http://www.paynoincometax.com/federalmafia.htm:
Irwin Schiff's latest book explains the procedures used by thousands to legally stop paying income taxes. It provides the information and documents required to immediately stop your wage withholding, and to file a request for a refund of all the taxes you paid.

Schiff.-.The.Federal.Mafia.-.How.the.government.illegaly.imposes.and.unlawfully.collects.income.taxes.(2000).zip

Also be sure to see his informative video:
Secrets.to.living.an.income.tax.free.life.in.USA.-.income.tax.is.voluntary.(Irwin.Schiff).rm

Please share this book with others, add links on other forums as I don't know many of them.