How a Bill Becomes a Law: A Plain-English Guide

Most Americans learn a simplified version of this process in school, but the real path a bill takes through Congress involves several committee stages, votes in two chambers, and a presidential decision -- and most bills never make it all the way through.

Step 1: Introduction

Any member of the House or Senate can introduce a bill. Once introduced, it's assigned a number and referred to the committee (or committees) with jurisdiction over its subject matter.

Step 2: Committee review

This is where most bills stall. Committees can hold hearings, request changes ("markups"), or simply decline to act. Only a fraction of introduced bills are ever brought to a committee vote.

Step 3: Floor action

If a bill clears committee, it goes to the floor of that chamber for debate and a vote. Rules for debate differ significantly between the House, where debate time is often limited, and the Senate, where rules such as the filibuster can require 60 votes to end debate on most legislation.

Step 4: The other chamber

A bill must pass both the House and the Senate in identical form. If each chamber passes different versions, they typically must be reconciled -- either through amendments between the chambers or a conference committee -- before final passage.

Step 5: The president's decision

• The president can sign the bill, and it becomes law.
• The president can veto it, sending it back to Congress, which can override the veto with a two-thirds vote in both chambers.
• If the president takes no action for 10 days while Congress is in session, the bill becomes law without a signature.
• If Congress adjourns during that 10-day window and the president has not signed it, the bill does not become law -- known as a "pocket veto."

Why so few bills pass

Thousands of bills are introduced in each two-year congressional term, but only a small percentage are ultimately enacted. Most fail to advance out of committee, and many others stall due to disagreements between the House and Senate or a lack of floor time.

Why the Senate is often the bigger hurdle

Unlike the House, where the majority party can generally control debate time and bring bills to a vote with a simple majority, the Senate operates under rules that allow a minority of senators to extend debate indefinitely -- commonly called a filibuster. Ending debate on most legislation requires 60 votes under current Senate rules, meaning many bills need bipartisan support to pass even if one party holds a numerical majority. Certain matters, such as budget reconciliation bills and judicial nominations, are exempt from this 60-vote threshold under special procedural rules.

Amendments and conference committees

Bills are frequently amended during committee review and floor debate. When the House and Senate pass different versions of the same bill, they must reconcile the differences -- either through one chamber simply adopting the other's version, an exchange of amendments between chambers, or a formal conference committee made up of members from both chambers who negotiate a single final text.

Committees: where the real work happens

Congressional committees are organized around specific policy areas -- for example, the House Ways and Means Committee handles tax legislation, while the Senate Armed Services Committee handles defense policy. Committee chairs have significant influence over which bills receive hearings and votes, which is a major reason committee assignments are so closely contested within each party.

The role of the president's own agenda

Beyond signing or vetoing legislation, presidents actively shape which bills move forward by publicly endorsing priorities, negotiating directly with congressional leaders, and using the annual State of the Union address to outline a legislative agenda. Because major legislation increasingly requires some degree of bipartisan cooperation in the Senate, presidents from both parties have often needed to work with members of the opposing party to get priority bills across the finish line.

Budget reconciliation: a notable exception

One significant exception to the Senate's standard 60-vote threshold is the budget reconciliation process, a special procedure tied to the federal budget that allows certain tax and spending legislation to pass with a simple majority. Because reconciliation bypasses the filibuster, it has been used by both parties in recent decades to pass major legislation when they hold unified control of Congress and the presidency but lack a 60-vote Senate majority. Reconciliation is subject to specific procedural rules limiting what kinds of provisions can be included, enforced through what's often called the "Byrd Rule" in the Senate.