How a Bill Becomes Law: The Legislative Process Explained

The process by which a bill becomes a law in the United States is defined by the Constitution and shaped by centuries of congressional procedure. It begins when a member of either the House of Representatives or the Senate introduces a bill, which is then referred to the appropriate committee for review. Committees hold hearings, debate the bill’s provisions, and may amend it before voting on whether to send it to the full chamber. This committee stage is where most bills either advance or die — the vast majority of introduced legislation never makes it out of committee.

If a bill passes committee, it is placed on the chamber’s calendar for floor debate and a vote. In the House, the Rules Committee typically sets the terms of debate, including time limits and whether amendments can be offered. In the Senate, debate rules are more flexible, and any senator may attempt to extend debate through a filibuster unless 60 senators vote for cloture. If a bill passes one chamber, it must then pass the other chamber in identical form. When the House and Senate pass different versions of the same bill, a conference committee composed of members from both chambers is convened to reconcile the differences and produce a final version.

Once both chambers approve the identical text, the bill is sent to the President, who may sign it into law or veto it. If the President vetoes the bill, Congress can override the veto with a two-thirds vote in both chambers — a high threshold that makes overrides relatively rare. The entire process is designed to ensure deliberation, representation, and checks on power, though critics note that it also makes major legislation difficult to pass without broad consensus.

This article is part of the How Congress Works series from Republican Leaders, an educational resource on the structure and function of the United States Congress.