A bill becomes a law when the House and Senate both pass the identical text and the president signs it, or lets it sit unsigned for 10 days (Sundays excepted) while Congress is in session. If the president vetoes it, Congress can still enact it by overriding the veto with a two-thirds vote in each chamber. Most bills never get that far: the vast majority stall in committee.
Here’s each step, where bills usually die, and why the party that controls each chamber after the November 3, 2026 midterms matters so much.
Step 1: Who can introduce a bill? #
Anyone can suggest an idea for a law: constituents, advocacy groups, businesses, state governments, the president. But only a member of Congress can introduce one. That member is the bill’s sponsor, and colleagues who sign on are cosponsors. A long cosponsor list, especially one with members of both parties, signals that a bill has a real chance.
Lawyers in the House and Senate Offices of Legislative Counsel help draft the text. One constitutional rule shapes where bills start: bills raising revenue must originate in the House (Article I, Section 7), and by custom spending bills do too.
Step 2: How is a bill introduced? #
- House: the sponsor drops the bill in the “hopper,” a box at the front of the chamber. It gets a number such as H.R. 1234.
- Senate: the sponsor submits it to the clerk or introduces it from the floor. It gets a number such as S. 567.
The text is published on Congress.gov, where you can follow every bill’s actions, cosponsors and votes.
Step 3: What happens in committee? #
The Speaker (in the House) or the presiding officer (in the Senate) refers the bill to one or more committees with jurisdiction, such as Ways and Means, Judiciary or Agriculture. This is where most bills end. A committee chair can simply decline to act, and the bill dies when the two-year Congress ends.
If the committee takes it up, the usual sequence is:
- Hearings. Experts, officials and advocates testify, often in a subcommittee.
- Markup. Members debate the text line by line and vote on amendments.
- Committee vote. If a majority agrees, the committee “reports” the bill to the full chamber, usually with a written report explaining it.
The Congressional Budget Office often estimates a bill’s cost at this stage. How few bills survive? GovTrack’s statistics show that in recent Congresses only a small single-digit percentage of introduced bills were enacted.
Committee chairs come from the majority party, which is one reason chamber control matters so much. If most House members want a vote the leadership is blocking, they can force one with a discharge petition signed by 218 members.
Step 4: How does floor debate work in each chamber? #
The two chambers work very differently.
In the House #
Major bills go first to the Rules Committee, which writes a “rule” setting how long debate lasts and which amendments are allowed. A closed or structured rule limits amendments sharply. The House votes on the rule, then debates and votes on the bill. Passage takes a simple majority of those voting. Less controversial bills often pass under “suspension of the rules,” which limits debate and requires a two-thirds vote.
In the Senate #
The Senate has no Rules Committee gatekeeper for floor debate, and debate is unlimited unless 60 senators vote to end it (cloture). So the practical threshold for most legislation is 60 votes, not 51. Exceptions include budget reconciliation bills, which need only a simple majority. Our explainer on how the Senate filibuster works covers the details, and how budget reconciliation works covers the exception.
Step 5: What happens when it goes to the other chamber? #
A bill that passes one chamber goes to the other, which can:
- pass it unchanged, sending it toward the president;
- amend it and send it back;
- pass its own version; or
- ignore it.
Both chambers must pass the exact same text. A single changed comma means another vote.
Step 6: How do the House and Senate resolve differences? #
There are two routes.
- Amendment exchange (“ping-pong”). Each chamber amends the other’s version and sends it back until one side accepts the other’s text. This is now the most common way to settle differences on major bills.
- Conference committee. Negotiators from both chambers write a compromise, called a conference report, which each chamber then approves in an up-or-down vote with no amendments. Conference committees were routine for decades but have become rare, used mainly for a few big bills such as the annual defense authorization.
Once both chambers pass identical text, the bill is enrolled, signed by the Speaker and the Senate’s presiding officer, and sent to the White House.
Step 7: What can the president do? #
The president has 10 days, not counting Sundays, to act.
| Action | Result |
|---|---|
| Sign it | It becomes law. |
| Veto it | It goes back to Congress with the president’s objections. Two-thirds of each chamber can override it. |
| Do nothing while Congress is in session | It becomes law without a signature after 10 days. |
| Do nothing after Congress adjourns | It dies. This is a pocket veto, and it can’t be overridden. |
Veto overrides are rare, because two-thirds of both chambers is a high bar in a closely divided Congress. The threat of a veto often shapes a bill before it ever reaches the president.
A quick summary #
| Step | Where | What happens |
|---|---|---|
| 1 | Member’s office | Drafted and sponsored |
| 2 | House or Senate | Introduced and numbered |
| 3 | Committee | Hearings, markup, vote; most bills stop here |
| 4 | Floor | Debated and passed (simple majority in the House; usually 60 to end debate in the Senate) |
| 5 | Other chamber | Passed, amended or ignored |
| 6 | Both chambers | Differences resolved by ping-pong or conference |
| 7 | White House | Signed, vetoed, or left unsigned |
Why the 2026 midterms matter for lawmaking #
Because committee chairs, the House floor schedule and the Senate’s agenda all belong to the majority, the party that wins each chamber on November 3 decides which bills get a hearing in 2027 and 2028. A split Congress, with each party holding one chamber, usually means far fewer laws and more fights over must-pass bills like government funding.
If you’re following which way the chambers are leaning, Election Tracker, our free iPhone app, shows Senate race polls grouped by state with a 30-day average, the generic congressional ballot for the House, and read-only prediction-market prices for House and Senate control. It doesn’t track bills or votes; for that, Congress.gov is the source.
Frequently asked questions #
What’s the difference between a bill and a law? #
A bill is a proposal. It becomes a law, or statute, only after both chambers pass identical text and the president signs it, lets it become law without signing, or Congress overrides a veto. Our explainer on bills vs. joint resolutions covers the other forms legislation can take.
Can a bill become law without the president’s signature? #
Yes, two ways. If the president doesn’t act within 10 days (Sundays excepted) while Congress is in session, it becomes law automatically. And if the president vetoes it, two-thirds of both the House and Senate can override the veto.
How long does it take for a bill to become a law? #
Anywhere from days to years. Emergency bills can pass in a week; most major legislation takes months of committee work and negotiation. A bill that doesn’t pass by the end of a two-year Congress dies and must be reintroduced.
Why do most bills fail? #
Committee chairs decline to act on most of them, many are introduced to make a point rather than to pass, and the Senate’s 60-vote threshold blocks many that do move. Bills also die when the House and Senate can’t agree on identical text.
Does the Senate need 60 votes to pass a bill? #
To pass a bill, the Senate needs a simple majority. But ending debate on most bills takes 60 votes, so in practice most legislation needs 60 supporters to get to a final vote. Budget reconciliation bills are the main exception.