How is the IRS Income Tax Unconstitutional when the 16th Amendment states it could?

AMENDMENT XVIPassed by Congress July 2, 1909. Ratified February 3, 1913. Note: Article I, section 9, of the Constitution was modified by amendment 16. The Congress shall have power to lay and collect taxes on incomes, from whatever source derived, without apportionment among the several States, and without regard to any census or enumeration. http://www.whitehouse.gov/kids/constitution/amendments11-27.html#16

Public Comments

1. you must be a liberal if you are just blindly asking a question defending taxes..
2. There are some who argue that the requirement that we fill out and sign tax returns is a violation of our 5th Amendment right against self incrimination. Since the government knows how much anyone, who draws wages, makes, the need to fill out a return is not there. It is a slim argument, but almost makes sense.
3. this might help: http://www.worldnetdaily.com/news/article.asp?ARTICLE_ID=18060
4. the 16th amendment was unconstitutionally ratified, so it's null and void, much like the 14th.