Subsidyscope provides data related to US Federal government subsidies and their role in the economy. In particular, their Tax Expenditure Database provides comprehensive information on "tax expenditures" -- the lowering of the taxes certain parties pay the federal government by allowing special tax exemptions, deductions or credits.
Tax Expenditure database contains more than 10 years of material. There appears to be no way to get all the data at once so the resources section just contains links for latest years.
Openness: NOT OPEN
From data page (emphasis added):
Subsidyscope maintains a variety of datasets. Some of them power the visualizations you see on the site, while others are used for behind-the-scene calculations. All of them are available for use under the terms of the Creative Commons Attribution-Noncommercial 3.0 United States License.
If you reference Subsidyscope in another publication please include a link to the main page (http://subsidyscope.org/) or include a citation such as this:
Subsidyscope.org. The Pew Charitable Trusts. Washington, DC. Accessed Month, XX, 20XX. Retrieved from http://subsidyscope.org.
|Author||Pew Charitable Trusts and Sunlight Foundation|
|Maintainer||Maintainer not given|
Subsidy Scope - US Federal Subsidies Data. Pew Charitable Trusts and Sunlight Foundation.
Retrieved 06:02, Jun 19, 2013 (UTC).
the Data Hub