Individual income tax rates and tax shares, 1988-1989

Average tax rates were 13.67% for 1987, 13.81% for 1988 and 13.71% for 1989. These rates, which reflect the broader concept of adjusted gross income (AGI) under the Tax Reform Act of 1986, were recomputed to match the 1979 definition of AGI, and rates were obtained of 13.56% for 1985, 13.59% for 1986, 13.49% for 1987, 13.71% for 1988 and 13.58% for 1989. The rates reflect changes in tax rate structure and treatment of certain items of income and deductions. Data is also included on computation of taxable income, marginal tax rates, income and tax shares, and alternative minimum tax.