It's amazing to me that he even plead not guilty with the evidence against him. He would have lost 1000 out of 1000 times. The cornerstone of his defense was that he was an idiot and a very bad bookkeeper. Hatch's accountant prepared a tax return with his $1 million winnings included, which would have had Hatch paying $120,000 in taxes. Richard didn't like the way that one turned out, so he had the accountant prepare one without the $1 million in it, and on that return Hatch even got a small refund. The accountant, covering his own ass, had Hatch sign a waver which explained how he strongly recommeded that Hatch file the return with the million in it. To compound matters, Hatch told lie after lie to perjure himself during the trial, which was why he got a stiffer sentance than the prosecution was asking for.
Moral of the story: Pay your taxes.