Saw an interesting story on the rates of under reporting their incomes for tax purposes: http://www.msnbc.msn.com/id/27328293

Some of the more interesting figures:

The previously unreported study estimates that taxpayers whose true income was between $500,000 and $1 million a year understated their adjusted gross incomes by 21 percent overall in 2001, compared to an 8 percent underreporting rate for those earning $50,000 to $100,000

It was the IRS' first such research effort since 1988, and it led the agency to estimate the 2001 gross "tax gap" at $345 billion.

In its 2001 tax gap study, the IRS estimated that individuals underreported business income by 43 percent overall. Sole proprietors, who report self-employment income on schedule C of their tax returns, underreported their income a stunning 57 percent.

I can't say I'm surprised, but if that estimate is correct that's a helluva a lot of money.