For a proposal to become a federal law, it has to be introduced in the House or the Senate, survive committee, pass both chambers in identical form, and then be signed by the President or enacted over a veto by a two-thirds vote in each chamber. That is how a bill becomes a law, and each step is a filter. Only a small fraction of the bills introduced in any Congress make it all the way through.
Who Introduces the Bill
Ideas for legislation come from constituents, advocacy groups, the executive branch, or lawmakers themselves. But only a sitting member of the House or Senate can formally introduce one. In the House, a representative drops the bill into a wooden box called the “hopper” on the Clerk’s desk, and the Clerk assigns it a number starting with “H.R.”1U.S. House of Representatives. Introduction and Referral In the Senate, a senator is recognized by the presiding officer and announces the bill’s introduction; Senate bills carry an “S.” designation.
Bills and joint resolutions are the two forms of legislation that can become law, and in practice there’s no meaningful difference between them.2U.S. Senate. Types of Legislation Concurrent and simple resolutions handle internal congressional business and never become law.
One constitutional rule dictates which chamber goes first on certain bills. Article I, Section 7 requires that any bill raising revenue originate in the House, though the Senate is free to amend it after that.3Cornell Law School. Origination Clause and Revenue Bills Once a bill is introduced, it’s referred to one or more committees based on its subject. In the House, the Speaker makes the assignment with help from the parliamentarian.
Committee Review
Committees are where most bills live and die. After referral, the committee may hold hearings to take testimony from experts, agency officials, and affected members of the public. Those hearings build the factual record that shapes everything that follows.4U.S. House of Representatives. In Committee
If the committee thinks the bill is worth advancing, it moves to a “markup” session. Members propose amendments, debate changes, and vote on each one. The committee then votes on whether to send the bill to the full chamber with a favorable recommendation, an unfavorable one, or to shelve it. Most bills referred to committee never even get a hearing. The committee chair has wide discretion over what gets attention.
When a committee refuses to act on a bill that has broad support, the House has a safety valve. If 218 representatives sign a discharge petition, the bill is pulled from committee, placed on a special calendar, and eventually brought to the floor regardless of the committee’s wishes.5Library of Congress. Discharge Procedure in the House Discharge petitions rarely succeed, but they occasionally force leadership’s hand on popular legislation.
Getting to the Floor
Clearing committee doesn’t guarantee a vote. A bill still needs floor time, and the two chambers handle that differently.
In the House, almost every major bill passes through the Rules Committee before it reaches the floor. The Rules Committee sets the terms of debate: how long members can speak and which amendments, if any, will be allowed. The standard categories are open rules (any member can offer any amendment that complies with House rules), structured rules (only specific, pre-approved amendments are permitted), and closed rules (no amendments at all, forcing an up-or-down vote on the bill as reported).6House Committee on Rules. Special Rule Types Modified-open rules fall between open and structured, sometimes requiring amendments to be published in the Congressional Record in advance. The Rules Committee is often called the Speaker’s right arm because its majority-party members generally follow leadership’s wishes.
The Senate runs with fewer procedural guardrails. The Majority Leader controls floor scheduling, often through unanimous consent agreements setting the terms of debate. Any single senator can object to such an agreement, which gives individual members far more leverage than their House counterparts have.
Floor Debate and Passage
House debate is tightly controlled by the rule governing the bill, and members typically get only a few minutes to speak. Senate debate is far more open-ended, and that openness is what makes the filibuster possible.
A filibuster is any tactic used to extend Senate debate and delay or block a vote. Because Senate rules place no general time limit on debate, opponents can keep talking indefinitely unless 60 senators vote to invoke cloture, which cuts off debate and forces a vote within a set timeframe.7U.S. Senate. About Filibusters and Cloture Controversial legislation effectively needs 60 votes to advance in the Senate, even though final passage itself requires only a simple majority. The 60-vote cloture threshold applies to legislation, not to nominations.
During floor debate, members can propose amendments. The House generally requires amendments to be germane to the bill’s subject; the Senate has no such general rule, which is why unrelated policy provisions sometimes hitch a ride on Senate bills.8U.S. Government Publishing Office. Riddick’s Senate Procedure – Germaneness of Amendments
Neither chamber can conduct business without a quorum, which the Constitution sets at a majority of each chamber’s members.9Library of Congress. Constitution Annotated – Article I Section 5 Assuming a quorum, a bill passes when it receives a simple majority of members present and voting.10U.S. Senate. About Voting The Constitution reserves supermajority requirements for a handful of specific actions, including overriding a presidential veto, proposing constitutional amendments, expelling a member, and ratifying treaties.
Passing the Other Chamber and Resolving Differences
After a bill passes one chamber, the other has to take it up separately. The receiving chamber refers the bill to its own committees, may hold its own hearings, and conducts its own floor debate. At the end of that process, the second chamber can pass the bill unchanged, amend it, or reject it.
If the second chamber passes a different version, the two chambers have to produce identical text before anything goes to the President. This happens two ways. The informal route is amendment exchange, sometimes called “ping-pong,” where one chamber amends the other’s version and sends it back, and the process continues until both agree. The more formal route is a conference committee: a temporary group of members from both chambers who negotiate a compromise.11U.S. Senate. Frequently Asked Questions about Committees – Section: Conference Committees
A conference committee produces a conference report with the final compromise text. Both chambers must approve that report without further amendments. If either chamber rejects it, the conferees may go back to work, or the bill may simply die. That all-or-nothing vote is one reason conference negotiations get contentious.
Enrollment and Presentment
Once both chambers have approved identical text, the bill enters a step most people never hear about. The Clerk of the House or the Secretary of the Senate, depending on where the bill originated, prepares the final official copy on parchment. The Speaker of the House and the President of the Senate sign that enrolled bill, and it is delivered to the White House.12U.S. Department of Justice. Whether Bills May Be Presented by Congress and Returned by the President Only after enrollment and signing by both presiding officers is the bill formally “presented” to the President, starting the constitutional clock.
Presidential Action
The President has three options when a bill arrives. Signing it makes it law immediately. Vetoing it returns the bill to the chamber where it originated, along with written objections. Or the President can do nothing, which triggers one of two outcomes depending on whether Congress remains in session.13Cornell Law School. U.S. Constitution Annotated – Article I – Section 7
If the President takes no action and Congress stays in session, the bill becomes law automatically after ten days, not counting Sundays. But if Congress adjourns during that ten-day window, the unsigned bill dies. This is a pocket veto, and unlike a regular veto, Congress has no chance to override it because there is no chamber in session to receive the President’s objections. The Supreme Court has held this applies not only to final adjournment at the end of a Congress but to any adjournment that prevents the President from returning the bill.14Justia. Pocket Veto Case, 279 U.S. 655 (1929)
When the President issues a regular veto, Congress can override by a two-thirds vote of those present and voting in both chambers. That is a high bar. Historically, Congress overrides fewer than ten percent of presidential vetoes. The President has to sign or reject the bill in its entirety; there is no line-item veto.
Reconciliation: The Filibuster Workaround
Most legislation has to clear the 60-vote cloture threshold in the Senate, but budget reconciliation is a fast-track process that limits Senate debate to 20 hours. That prevents a filibuster and allows passage with a simple majority. Many of the largest tax and spending laws in recent decades have moved through reconciliation for that reason.
The tradeoff is a strict limit on content. The Byrd rule, named for Senator Robert Byrd, bars provisions considered “extraneous” to the budget. A provision violates the rule if it has no effect on federal spending or revenue, if its budgetary impact is merely incidental to a policy change, or if it would increase the deficit beyond the window covered by the reconciliation bill.15Library of Congress. The Senate’s Byrd Rule – Frequently Asked Questions Any senator can raise a point of order against a provision they believe violates the rule, and waiving that objection takes 60 votes. The Senate parliamentarian advises on whether provisions qualify, and those rulings carry heavy practical weight even though they are technically advisory.
Reconciliation can only be used once per budget resolution, or once each for spending, revenue, and the debt limit, so leadership has to choose carefully which bills to route through it. The restrictions mean reconciliation bills usually focus narrowly on taxes and entitlement spending rather than sweeping regulatory changes.