The tax expenditure for health benefits is the amount of revenues that the federal government forgoes by exempting health benefits and spending from the federal income and Social Security taxes, including (1) employer health benefit contributions for workers and retirees, (2) health benefit deductions for the self-employed, (3) health spending under flexible spending plans, and (4) the tax deduction for health expenses. We estimate that this expenditure will be dollars 188.5 billion in 2004. Families with incomes of dollars 100,000 or more (14 percent of the population) account for 26.7 percent of all health benefit tax expenditures.