The use of abusive tax shelters by major corporations has been called “‘the most serious compliance issue threatening the American tax system . . . .’” Losses to the Department of the Treasury (“Treasury”) are estimated to range anywhere from $7 billion to $30 billion per year. Meanwhile, corporate profits have risen 23.5% while their corresponding tax obligations rose by only 7.7%. Personal income taxes, on the other hand, are up 44%, which represents 79% of the total federal income tax and is estimated to increase to 85% by the year 2004. Also astounding is that the corporate tax-to-profit ratio has dropped between 1.5% and 2.9%, roughly translating into a decrease in corporate income tax receipts between $13 and $24 billion. Although the decrease in corporate tax receipts is unlikely to be attributed to a single cause, many commentators point to the growing acceptance of abusive tax shelters by large corporations as a major contributor.