Taxpayer Delinquent Return Investigations Fiscal Year Individual Master File Business Master File 1992 877,966 647,090 1993 888,793 580,121 1994 1,015,361 597,946 1995 1,307,858 629,983 1996 1,099,732 715,608 1997 822,898 812,884 1998 1,092,557 790,123 1999 1,577,021 736,852 2000 1,183,725 486,722 2001 1,000,088 445,348

Source: Internal IRS collection reports  

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