According to the IRS, taxpayers underpay their taxes by some $300 billion. If you know someone that is contributing to that deficit, the IRS may be willing to pay you up to $10 million for the information you provide. The bigger the cheating you report, the more you're likely to receive.

The most important thing to claim your reward is quality documentation. Without documentation of the cheating going on, it's unlikely that the IRS will investigate the charges and thus no money bonus for you. As might be expected, the IRS receives a lot of information that is merely a hunch or because someone is trying to get back at somebody.

If you feel you have information and documentation to back up your report, the IRS would be extremely interested in hearing from you. You can contact the IRS toll free at 1-800-829-0433 if you suspect tax fraud. When contacting them, you'll be expected to provided the following information:

1. Your name or an alias
2. The name and address of the person you're reporting
3. The length the tax fraud has taken place including the years
4. The social security number or Employer Identification Number of the person you're reporting.
5. Any relevant financial records which pertain to the fraud.
6. Any documents or records which substantiate the fraud.
7. The date of birth of the person you're reporting.

The rewards for reporting the tax cheat can be hefty. If the IRS does investigate and recover money from your information, you may be entitled to anywhere from 1% and 15% of the money they recover - up to $10 million. The IRS has a minimum payout of $100 which means any tax cheating reported has to be in the thousands of dollars for any chance of you receiving a reward. For more information on the rewards, you can visit http://www.irs.gov and look at publication 733 - Rewards for Information Provided by Individuals to the Internal Revenue Service.