Highlights of IRS statistics available on this site:

IRS Data Books: These contain files of data on collecting revenue, enforcing the law, assisting taxpayers, and managing the system. Each Data Book table is in its own file. Beginning with FY-2000, there is also a PDF file for each year's complete Data Book.

Weekly Filing Stats and Taxpayer Usage Study: Files with data from individual income tax returns for each week of the filing season, going back to returns filed in 1998.

Tax Stats Index: This has links to the Statistics of Income (SOI) collections in various groupings -- by IRS activity (Collection, Exam, etc.), by topic, or by SOI publication series.

Projections: Files from various Projections publications or SOI Bulletins.

Individual Tax Stats: Links to individual return data assembled in various ways. In some cases - such as county data, migration data, ZIP code data - the link shows an example of the files that can be ordered and the procedures for ordering data from SOI. Other links - such as state income data - contain links to published and/or unpublished SOI data.

Statistics of Income Bulletins: These quarterly Bulletins contain articles and data releases on a wide variety of topics. Available issues go back to Winter 1997-98.