This is an E-supplement to GAO-12-554. This e-supplement provides an inventory of spending programs, tax expenditures, and other activities (collectively, “activities”) that federal agencies and entities use to support rental housing, homeownership, or both. For each activity, this inventory includes the following information: (1) the implementing or administering agencies or entities; (2) a brief description of the activity; (3) the primary purpose of the activity, which we judgmentally determined after reviewing its title, mission, objective, or goal; (4) type of housing supported (for example, homeownership, rental housing, or both); (5) the type of assistance provided; and (6) the obligations or revenue loss estimates for the activity in fiscal year (FY) 2010. This inventory is the basis for information presented in the full report, Housing Assistance: Opportunities Exist to Increase Collaboration and Consider Consolidation, GAO-12-554.