A bill is a proposed law. It is a draft that a legislature considers, debates, and either passes into law or rejects. In the United States Congress, thousands of bills are introduced in each two-year term, and only a small fraction become law. Understanding how a bill moves from an idea to a statute explains why the final text often looks different from the first version.
Bill, Act, Statute, and Resolution
A bill becomes an act when it passes both chambers, and it becomes a statute, or law, when it is enacted. A resolution is a different instrument. Simple and concurrent resolutions express the sense of one or both chambers and do not go to the President. Joint resolutions can have the force of law when signed, and they are used for things such as continuing appropriations and constitutional amendments proposed by Congress. The distinction matters because not every measure a legislature votes on is a bill.
Where Bills Come From
Bills start as ideas from members of Congress, the President, executive agencies, interest groups, constituents, and state governments. A member sponsors the bill, and other members may add their names as cosponsors. Only a member may introduce a bill; outside groups cannot file one directly. The sponsor usually drafts the text with legislative counsel, and the bill is introduced in the chamber the sponsor belongs to. Bills that raise revenue must originate in the House under Article I, Section 7 of the Constitution.
Numbering and Types of Measures
| Type | Prefix | Typical use |
|---|---|---|
| House bill | H.R. | General legislation |
| Senate bill | S. | General legislation |
| House joint resolution | H.J.Res. | Appropriations, constitutional amendments |
| Senate joint resolution | S.J.Res. | Same purposes as House joint resolutions |
| Concurrent resolution | H.Con.Res. or S.Con.Res. | Budget matters and internal business |
| Simple resolution | H.Res. or S.Res. | Rules and procedure of one chamber |
Bills are numbered sequentially within each two-year Congress, so a bill number alone does not identify a measure unless the Congress is specified. A bill from the current Congress and a bill with the same number from an earlier Congress are different proposals.
The Path Through Congress
- Introduction and referral to committee.
- Committee review, hearings, and markup.
- Floor debate and a vote in the first chamber.
- Referral and action in the second chamber.
- Resolution of differences between the chambers.
- Presentment to the President.
Committee Stage
Committees do most of the work. A committee may hold hearings, call witnesses, and rewrite the text in a markup session. Many bills die here because the committee chair never schedules them. If a committee reports the bill, it goes to the full chamber with a report explaining the measure. In the House, the Rules Committee often sets the terms of floor debate, including which amendments may be offered. In the Senate, unanimous consent agreements and the cloture rule shape the schedule.
Floor Action and the Senate
In the House, debate is usually time-limited and amendments are constrained by the rule adopted for the bill. In the Senate, debate is generally open, and a senator may filibuster to block a vote. Ending debate requires cloture under Senate Rule XXII, which takes three-fifths of senators duly chosen and sworn, normally 60 votes. That threshold means most major bills need broad support to advance in the Senate.
Resolving Differences Between the Chambers
Both chambers must pass identical text before a bill can become law. If the House and Senate pass different versions, they may exchange amendments, or a conference committee of members from both chambers may negotiate a compromise. The resulting conference report must be approved by both chambers. If either chamber changes the text, the bill returns to the other for another vote.
Presidential Action
Once Congress passes identical text, the bill is presented to the President. Article I, Section 7 of the Constitution gives the President three options: sign the bill into law, veto it and return it with objections, or take no action. If Congress is in session, taking no action for ten days, excluding Sundays, lets the bill become law without a signature. If Congress adjourns before the ten days expire, the bill does not become law, which is called a pocket veto. Congress can override a regular veto with a two-thirds vote of each chamber.
After Enactment
A law that survives this process is assigned a public law number and published as a slip law by the Government Publishing Office at govinfo.gov. The Office of the Law Revision Counsel then organizes enacted laws by subject into the United States Code. The full legislative history, including text versions, committee reports, and recorded votes, is available at congress.gov.
Why Most Bills Fail
Most introduced bills never become law. A bill can stall because the committee chair does not schedule it, because the leadership does not bring it to the floor, because it lacks the votes for cloture in the Senate, or because the two chambers cannot agree on identical text. Bills also die at the end of a Congress, when all unfinished measures expire and must be reintroduced in the next term. Sponsors often reintroduce the same proposal across several Congresses before it advances or is abandoned.
Tracking a Bill
Congress.gov lets the public follow each measure through its stages. A bill page shows the sponsor and cosponsors, the text of each version, committee actions, floor votes, and any public law number. The Congressional Record, published at govinfo.gov, records floor debate and proceedings. Committee reports explain the purpose and expected effect of a measure and are often the most useful source for understanding what a bill is meant to do.
State Bills
State legislatures follow similar stages, but the details differ. Some states have a part-time legislature, some allow citizens to propose statutes by initiative, and many governors have a line-item veto that lets them strike parts of an appropriations bill. State legislature websites publish bill text, calendars, and votes. Because state constitutions and rules control the process, the path for a state bill can look quite different from the federal one.
This guide is general information, not legal advice. Legislative procedure is governed by the Constitution, chamber rules, and the specific text of each measure, and it can change from one Congress to the next.