How a Bill Becomes a Law in the United States, Step by Step
A plain-English walk through how a bill moves through Congress and the White House, including committees, floor votes, vetoes and what happens if the president does nothing.
Thousands of bills are introduced in Congress every year, but only a small share ever become law. Understanding the path a bill takes explains why legislation can move slowly, and why it often changes along the way.
Step 1: A member introduces the bill
Only a member of Congress can formally introduce a bill, though ideas can come from the president, interest groups, agencies or ordinary voters. A bill can start in the House of Representatives or the Senate. The exception is bills for raising revenue (taxes), which the Constitution says must start in the House.
Step 2: Committee review
The bill is sent to a committee that handles its subject, such as Armed Services or Energy and Commerce. Committees may hold hearings, hear from experts and amend the text in a session called a markup. Many bills stop here. A committee that does not act on a bill can effectively end its chances.
Step 3: Floor debate and vote
If the committee approves the bill, it goes to the full chamber. In the House, the rules for debate are set for each bill. In the Senate, debate is far less restricted, which is why a minority of senators can delay action. A simple majority passes a bill, but ending debate on most Senate bills typically needs 60 votes.
Step 4: The other chamber
The second chamber repeats the process: committee, debate, vote. It may pass the bill unchanged, reject it, or amend it. If the two chambers pass different versions, they must agree on one identical text. They can exchange amendments, or appoint a conference committee of members from both chambers to negotiate a compromise.
Step 5: The president decides
Once both chambers pass identical text, it goes to the president, who has several options:
| Presidential action | Result |
|---|---|
| Signs the bill | It becomes law |
| Vetoes the bill | It returns to Congress, which can override with two-thirds of both chambers |
| Does nothing while Congress is in session | It becomes law after 10 days (Sundays excluded) |
| Does nothing as Congress adjourns | A “pocket veto”: the bill dies |
Why most bills never become law
Bills compete for limited floor time, depend on committee chairs, and need support from enough members of both parties and both chambers. Provisions are often folded into larger “must-pass” bills, such as government funding bills, so a single piece of legislation can carry many unrelated changes.
How to follow a bill yourself
Congress.gov, run by the Library of Congress, lets you search any bill by number or topic, read its text, and see every action taken so far.
Frequently asked questions
How many votes does it take to override a presidential veto?
Two-thirds of both the House of Representatives and the Senate must vote to override a veto. That is a much higher bar than the simple majority needed to pass most bills.
Do all bills start in the House?
No. Most bills can start in either chamber, but the Constitution says bills for raising revenue must originate in the House of Representatives.
What is a filibuster?
A filibuster is a tactic in the Senate that delays or blocks a vote by extending debate. Ending debate on most legislation (called cloture) usually requires 60 of the 100 senators.
