CBO produces many reports that discuss options for changes in spending and taxes. For each Congress, CBO produces a report that brings together a wide range of options for reducing the deficit. The options are derived from many sources and, in keeping with CBO’s mandate to provide objective analysis without making recommendations, each option includes arguments for and against it.
CBO: Unauthorized Appropriations and Expiring Authorizations
A new report from the Congressional Budget Office (CBO) says that "lawmakers appropriated about $310 billion for fiscal year 2016 for programs and activities whose authorizations of appropriations have expired." Report.
The Fiscal Times: Why Is the Government Spending $310 Billion on ‘Unauthorized’ Programs?