Historical Effective Federal Tax Rates: 1979 to 2005
"This supplement provides additional data on historical effective federal tax rates as estimated by the Congressional Budget Office (CBO) for the years 1979 through 2005. The data presented in this report show aggregate income and federal taxes, by source, for various income groupings, including a finer disaggregation in the highest income percentile. CBO derives its estimates from Internal Revenue Service data on individual income tax returns, supplemented with information from the Bureau of the Census’s Current Population Survey. Details about CBO’s methodology and additional tables are available on the agency’s Web site in the special collection “Distribution of Federal Taxes.”