Check out Fairtax.org. In my opinion this is a much better way to go. Basically it's a tax on new goods and services and not your income. There is a chart on the site that compares flat, fair and income taxes. This gives the consumer control over his/her money. The more new goods you purchase, the more tax you pay. Our current tax system encourages cheating and has too many loopholes. This way even people who work off the books would pay their fair share.
I am retired and right after retirement I worked one season for one of those national tax preparers.
We had people calling who wanted to know the most they could earn to get the most out of the earned income credit. The rest of the year they would work off the books.