United States Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies

The U.S. Senate Appropriations Subcommittee on Interior, Environment, and Related Agencies is one of twelve subcommittees of the U.S. Senate Committee on Appropriations. It was formerly known as the Subcommittee on Interior and Related Agencies, but was renamed to reflect its jurisdiction over funding for federal environmental programs, and to more closely align the subcommittee with its counterpart on the House Appropriations Committee. The United States Senate Committee on Appropriations has joint jurisdiction with the United States House Committee on Appropriations over all appropriations bills in the United States Congress. Each committee has 12 matching subcommittees, each of which is tasked with working on one of the twelve annual regular appropriations bills. This subcommittee has jurisdiction over the budget for the United States Department of the Interior and the United States Environmental Protection Agency.

Traditionally, after a federal budget for the upcoming fiscal year has been passed, the appropriations subcommittees receive information about what the budget sets as their spending ceilings. This is called "302(b) allocations" after section 302(b) of the Congressional Budget Act of 1974. That amount is separated into smaller amounts for each of the twelve Subcommittees. The federal budget does not become law and is not signed by the President. Instead, it is guide for the House and the Senate in making appropriations and tax decisions. However, no budget is required and each chamber has procedures in place for what to do without one. The House and Senate now consider appropriations bills simultaneously, although originally the House went first. The House Committee on Appropriations usually reports the appropriations bills in May and June and the Senate in June. Any differences between appropriations bills passed by the House and the Senate are resolved in the fall.

An appropriations bill is a bill that appropriates (gives to, sets aside for) money to specific federal government departments, agencies, and programs. The money provides funding for operations, personnel, equipment, and activities. Regular appropriations bills are passed annually, with the funding they provide covering one fiscal year. The fiscal year is the accounting period of the federal government, which runs from October 1 to September 30 of the following year.

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