During one point during my interview/debate/ with Peter Schiff, after numerous times stating zero taxes were my choice, and with Schiff pushing for an answer from me on a theoretical basis as to what tax made the most sense, I said that you just take the revenues desired and divide it by the population over 18, a poll tax, aka, a capitation tax.
Peter caught me off gaurd when he said that a capitation tax is not allowed by the Constitution. Peter's wrong. The capitatin clause of Article I of the United States Constitution, reads "[n]o capitation, or other direct, tax shall be laid, unless in proportion to the census or enumeration herein before directed to be taken."
Update: I further explain what went on in this part of the interview, here.