The information about the IRS, its criminal and civil enforcement efforts and the taxpaying behavior of the American people, was compiled by TRAC from a variety of sources. The sources included computerized data obtained under the Freedom of Information Act from the Justice Department, the Internal Revenue Service, and the United States Office of Personnel Management. These data were supplemented by interviews with current and former government officials, tax attorneys, and agency data processing specialists. Additional information was drawn from internal administrative records, electronic and hardcover publications of the Internal Revenue Service; internal administrative records and statistical reports of the Justice Department; electronic databases, internal records and hardcover publications of the Administrative Office of the United States Courts; internal records and published reports of the Office of Personnel Management; electronic databases of the U.S. Congress; internal records and published reports of the General Accounting Office; and county-level and geo-based files from the United States Census Bureau.

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