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Microdata files for all 2009 Forms 990 and 990-EZ sampled for the annual SOI studies of tax-exempt organizations.

IRS Publication 6149 contains multi-year projections of the number of tax returns to be filed with the IRS by state¡ªas determined by the addresses on the tax returns.

IRS Publication 6186 contains multi-year projections of the number of tax returns to be filed with the IRS by the calendar year of filing.

IRS Publication 6187 contains multi-year projections of the number of individual Form 1040 series returns to be filed with the IRS by major processing categories important to IRS planning operations.

Publication 6961 is revised annually to update detailed calendar year projections of information and withholding documents to be filed at the US and campus levels.

IRS Publication 6292 contains multi-year projections of the number of tax returns to be filed with the IRS by fiscal year of filing.

Projections of Federal Tax Return Filings, SOI Tax Stats - Projections Articles

SOI Tax stats - IRS data book glossary

SOI Tax Stats Contact Statistics of Income

SOI Fall Bulletin 2012