Maybe someone in your extended family is driving a luxury car and comments that only fools pay all of their taxes. Or maybe a contractor demands payment in cash. Or perhaps someone at work is not reporting all of his or her income. If cheating on taxes bothers you, the IRS wants to hear from you (and may make it worthwhile). The IRS has two whistleblower programs. The small-awards program is for situations involving less than $2 million of tax, and the award can be as high as 15% of collections, although it often is less. The large-awards program covers situations involving $2 million or more of tax. Here, the reward can go as high as 30%. The IRSs tip line is 1-800-829-0433, and the appropriate form to report tax fraud is Form 3949A (Information Referral). Would you turn in someone?