Periodically, Congress mandates that Treasury report on a specific topic about which Congress would like to know more. Here you can find these reports. These studies are often written in cooperation with other Federal agencies.
2010 – 2011
2000 – 2009
1989 – 1999
Report of the Department of the Treasury on Integration of The Individual and Corporate Tax Systems: Taxing Business Income Once (This report was written in response to a Congressional Mandate to study this topic. A follow-up report, which contains Treasury's recommendations, is available here)
Reports to the Congress on Depreciation (1989-1991) (The Tax Reform Act of 1986 authorized the Department of the Treasury to monitor and analyze actual experience with all tangible depreciable assets. In response, the Office of Tax Analysis prepared the following studies.)