From the IRS' Tax implications of settlements and judgments it seems that a class action suit could potentially be categorized as punitive damages and be considered taxable.
> Punitive damages are not excludable from gross income, with one exception. The exception applies to damages awarded for wrongful death, where under state law, the state statute provides only for punitive damages in wrongful death claims. In these cases, refer to IRC Section 104(c) which allows the exclusion of punitive damages. Burford v. United States, 642 F. Supp. 635 (N.D. Ala. 1986).
