Reference
How a Bill Becomes a Law: The Legislative Process Explained
Turning an idea into federal law requires approval from committees, both chambers of Congress, and the President — a system designed to ensure careful deliberation.
Last updated January 15, 2026
Bills Introduced
~10,000
Per 2-year Congress
Become Law
5–10%
Most die in committee
Veto Override
2/3 Vote
Both chambers required
The Legislative Process: Step by Step
- 1
Bill Introduction
Any member of Congress can introduce a bill. In the House, a representative drops the bill into the "hopper." In the Senate, a senator must be recognized by the presiding officer. Only members of Congress can officially introduce bills.
- 2
Committee Assignment
The bill is assigned to a committee based on its subject matter (agriculture, transportation, judiciary, etc.). Most bills die in committee and never advance. Committees act as gatekeepers, determining which bills deserve full consideration.
- 3
Committee Review and Hearings
The committee studies the bill in detail: holding public hearings with expert testimony, requesting agency reports, debating and amending the bill ("marking up"), and voting on whether to send it to the full chamber.
- 4
Floor Debate and Vote (First Chamber)
If the committee approves, the bill goes to the full House or Senate for debate. The House has strict time limits; the Senate allows unlimited debate (leading to filibusters), giving individual senators more power to delay or block legislation.
- 5
Second Chamber
After passing one chamber, the bill moves to the other. The second chamber repeats the full process: committee review, possible amendments, floor debate, and a vote. Both chambers must pass the exact same version.
- 6
Conference Committee (if needed)
If the House and Senate pass different versions, a conference committee with members from both chambers reconciles the differences. The compromise version must then be approved by both chambers again.
- 7
Presidential Action
Once both chambers pass the identical bill, the President may: (1) Sign it — becomes law immediately, (2) Veto it — Congress can override with 2/3 vote in both chambers, (3) Take no action for 10 days (in session) — becomes law automatically, or (4) Pocket veto (Congress adjourns within 10 days) — bill dies.
- 8
Law Implementation
After the President signs (or Congress overrides a veto), it becomes a public law. Federal agencies then create regulations and procedures to implement and enforce the new law.
- 1
Bill Introduction
Any member of Congress can introduce a bill. In the House, a representative drops the bill into the "hopper." In the Senate, a senator must be recognized by the presiding officer. Only members of Congress can officially introduce bills.
- 2
Committee Assignment
The bill is assigned to a committee based on its subject matter (agriculture, transportation, judiciary, etc.). Most bills die in committee and never advance. Committees act as gatekeepers, determining which bills deserve full consideration.
- 3
Committee Review and Hearings
The committee studies the bill in detail: holding public hearings with expert testimony, requesting agency reports, debating and amending the bill ("marking up"), and voting on whether to send it to the full chamber.
- 4
Floor Debate and Vote (First Chamber)
If the committee approves, the bill goes to the full House or Senate for debate. The House has strict time limits; the Senate allows unlimited debate (leading to filibusters), giving individual senators more power to delay or block legislation.
- 5
Second Chamber
After passing one chamber, the bill moves to the other. The second chamber repeats the full process: committee review, possible amendments, floor debate, and a vote. Both chambers must pass the exact same version.
- 6
Conference Committee (if needed)
If the House and Senate pass different versions, a conference committee with members from both chambers reconciles the differences. The compromise version must then be approved by both chambers again.
- 7
Presidential Action
Once both chambers pass the identical bill, the President may: (1) Sign it — becomes law immediately, (2) Veto it — Congress can override with 2/3 vote in both chambers, (3) Take no action for 10 days (in session) — becomes law automatically, or (4) Pocket veto (Congress adjourns within 10 days) — bill dies.
- 8
Law Implementation
After the President signs (or Congress overrides a veto), it becomes a public law. Federal agencies then create regulations and procedures to implement and enforce the new law.
Key Facts About Legislation
- Success rate is low: Of the thousands of bills introduced each Congress, only about 5–10% become law.
- Revenue bills must start in the House: By constitutional requirement, all bills for raising revenue (taxes) must originate in the House of Representatives.
- Either chamber can initiate other bills: For non-revenue legislation, bills can start in either the House or Senate.
- Companion bills are common: Often, identical or similar bills are introduced in both chambers simultaneously to speed up the process.
- Bills must pass in the same 2-year Congress: If a bill doesn't pass both chambers within the 2-year congressional session, it dies and must be reintroduced in the next Congress.
Why the Process Is Deliberately Slow
The Founders designed this multi-step process to prevent hasty or poorly-considered legislation. By requiring approval from multiple committees, both chambers of Congress, and the President, the system ensures broad consensus and careful deliberation.
While this can frustrate those seeking quick change, it also prevents the passage of laws that lack widespread support. The system prioritizes stability and thorough vetting over speed.
Frequently Asked Questions
How does a bill become a law?
A bill becomes law through these steps: (1) A member of Congress introduces it, (2) A committee reviews and votes on it, (3) The full House or Senate debates and votes, (4) The other chamber repeats the process, (5) Both chambers pass the identical version, (6) The President signs it. If the President vetoes, Congress can override with a two-thirds vote in both chambers.
Can anyone introduce a bill in Congress?
No, only members of Congress can officially introduce bills. In the House, any representative can introduce a bill. In the Senate, any senator can introduce a bill. However, anyone can draft legislation or work with a member to get a bill introduced.
What happens if the President vetoes a bill?
When the President vetoes a bill, it returns to Congress. Congress can override the veto by voting again — if two-thirds of both the House and Senate vote to override, the bill becomes law without the President's signature. Veto overrides are rare and require strong bipartisan support.
How many bills actually become laws?
Only about 5–10% of bills introduced in Congress become law. Thousands of bills are introduced each two-year congressional session, but most die in committee without receiving a vote. This reflects the difficulty of achieving consensus and the thorough vetting required.
Do both the House and Senate have to pass a bill?
Yes, both the House and Senate must pass the exact same version of a bill before it can go to the President. If one chamber makes changes to a bill passed by the other, it must go back for approval. Sometimes a conference committee reconciles different versions.