Appropriation acts provide authority for federal programs or agencies to incur obligations and make payments from the Treasury. CBO does not provide official cost estimates of appropriation acts but, instead, produces estimates of budget authority and spending under such acts. In addition, CBO prepares a report each January that lists all programs and activities funded for the current fiscal year for which the authorizations that established or continued their appropriations have expired as well as all programs and activities for which the authorizations of appropriations will expire during the current fiscal year.