H.R. 3989 would extend through September 30, 2023, the authority of the federal government to conduct surveillance under title VII of the Foreign Intelligence Surveillance Act (FISA) of 1978 (sections 1881-1881g of title 50, United States Code), as added by the FISA Amendments Act of 2008 (Public Law 110-261) and by the USA FREEDOM Act of 2015 (Public Law 114-23). That authority is set to expire on January 19, 2018. CBO does not provide estimates for classified programs; therefore, this estimate addresses only the unclassified aspects of the bill. On that limited basis, CBO estimates that implementing the unclassified provisions of the bill would cost $3 million over the 2018-2022 period, subject to the availability of appropriated funds.