Both the original minimum tax and its successor, the individual alternative minimum tax (AMT), have applied in the past to a small minority of high-income households. But barring a change in law, this "class tax" will soon be a "mass tax." By the end of the decade, repealing the AMT will cost more than repealing the regular income tax. This paper explains how a tax originally designed to target 155 taxpayers could grow to cover 36 million, discusses economic issues related to the alternative minimum tax and examines options for reform.