How a Bill Becomes a Law

A bill does not become law by one vote

A bill does not pass through one vote. It survives drafting, introduction, committee review, floor debate, a second chamber, possible reconciliation, and presidential action. At every stage, the bill can advance, stall, get rewritten, or die.

Every federal law starts as a bill. A member of the House introduces it as H.R. followed by a number. A senator introduces it as S. followed by a number. From that point, the bill must pass both chambers in identical form and survive presidential review before it becomes law. The passage rate varies by Congress, but it has averaged about 6% historically.

The 7 steps from bill to law

1. Drafting

A bill begins as an idea. A member of Congress writes it, usually with help from staff, constituents, or advocacy groups. Constituents who contact their representative about a specific problem are often the starting point for legislation. About 11,000 bills are introduced each Congress.

2. Introduction

A senator or representative formally introduces the bill in their chamber. House bills are numbered H.R. followed by a number. Senate bills are S. followed by a number. The bill is published in the Congressional Record. Introduction does not guarantee any further action.

3. Committee review

Committee referral is the most lethal stage. The bill goes to one of 36 standing committees. In practice, the chair controls whether it gets a hearing. More than 90% of introduced bills never do.

If the chair schedules a hearing, the bill goes through testimony, debate, and markup, where members propose amendments and vote on changes. The committee then votes whether to send the bill to the full chamber.

”Committees are where the real legislative work happens. Bills are often changed beyond recognition, delayed indefinitely, or stopped entirely before they ever reach a full chamber vote.”

Northwestern Law Library, The Legislative Process

This is also where constituent pressure carries the most weight. Research on congressional offices shows that staff track contact on specific bills. A call to a committee member about a bill in their jurisdiction is harder to set aside than a general message to your own representative.

4. Floor debate and vote

If the committee advances the bill, it goes to the full chamber for debate. Members propose amendments, argue for and against, and vote. In the House, the Speaker controls floor time and a simple majority of 218 passes the bill. In the Senate, any senator can delay proceedings through unlimited debate unless 60 senators vote for cloture.

5. The other chamber

The bill moves to the second chamber and repeats the process from committee to floor vote. The second chamber can pass it unchanged, amend it, or ignore it entirely. A bill that passes the House but stalls in the Senate dies at the end of the two-year Congress. If a member wants to try again, they reintroduce it from scratch.

6. Resolving differences

Both chambers must pass identical text. If they pass different versions, they negotiate through a conference committee (members from both chambers work out a final version) or an amendment exchange (one chamber accepts the other’s changes). The agreed text goes back to both chambers for a final vote.

7. Presidential action

The president has 10 days to act. Sign the bill into law. Veto it and return it to Congress with objections. Or do nothing. If the president takes no action for 10 days while Congress is in session, the bill becomes law without a signature. If Congress adjourns during that window, the bill dies through a pocket veto, which cannot be overridden. Presidents have used pocket vetoes 1,066 times.

Where bills die

At each stage, most bills drop out. The approximate numbers from the 118th Congress show how steep the decline is.

~11,000

Bills introduced

~1,100

Get a committee hearing

~550

Pass committee

~420

Pass one chamber

~310

Pass both chambers

~274

Signed into law

From Introduction to Law: How Bills Narrow

Stage	Bills remaining
Bills introduced	~11,000
Get a committee hearing	~1,100
Pass committee	~550
Pass one chamber	~420
Pass both chambers	~310
Signed into law	~274

Approximate numbers per Congress. The sharpest drop happens before committee hearings. Source: GovTrack, Emory Law.

For comparison, state legislatures enact about 25% of introduced bills. Congress averages roughly 5-6%. The federal process is designed to make lawmaking difficult. Most bills are filtered out long before they reach a vote.

House vs Senate: different rules, different power

The two chambers handle bills differently. The House moves faster with stricter rules. The Senate moves slower with more individual power per senator.

Votes Needed at Each Stage

Program	Amount
House majority (pass)	218
Senate majority (pass)	51
Senate cloture (end debate)	60
House override (veto)	290
Senate override (veto)	67

The 60-vote cloture threshold is the biggest gap between majority support and passage. 41 senators can block what 59 want.

The Senate’s 60-vote cloture threshold means 41 senators can block legislation that a majority supports. This is the filibuster. It has been used to defeat civil rights legislation, gun safety bills, immigration reform, and climate policy that had majority support in both chambers.

Budget reconciliation is the workaround. It allows the Senate to pass spending, revenue, and debt limit changes with 51 votes instead of 60. The trade-off: reconciliation bills must affect the federal budget and are subject to the Byrd Rule, which strips out provisions that don’t have a direct budgetary impact.

Vetoes and overrides

The Constitution gives the president the power to reject legislation. Congress can override a veto, but it almost never does.

A regular veto returns the bill to Congress with the president’s objections. Congress can override it with a two-thirds vote in both chambers: 290 in the House, 67 in the Senate. That threshold is high enough that 93% of vetoes stand.

A pocket veto is absolute. If Congress adjourns during the 10-day signing window and the president does not sign the bill, it dies. No override is possible. Presidents have used pocket vetoes 1,066 times.

Vetoes in the current Congress

Trump has vetoed two bills in his second term. Both passed Congress with bipartisan support through voice votes.

Three paths to policy

Not all policy goes through the standard legislative process. Understanding the alternatives explains why some policies pass quickly and others never get a vote.

Regular legislation is durable but requires 60 Senate votes. Reconciliation needs only 51 but is limited to budget matters. Executive action skips Congress but the next president can reverse it on day one. The section below shows how each of these paths played out in the current Congress.

How the process is playing out in 2025-2026

Reconciliation bypassed the Senate’s 60-vote threshold

The One Big Beautiful Bill Act used reconciliation to pass $911 billion in Medicaid cuts, work requirements starting January 2027, and permanent extension of 2017 tax rates. The Senate passed it 51-50. The House passed it 218-214. Neither margin would have survived a filibuster.

Executive action bypassed Congress entirely

Trump invoked the Defense Production Act to spend $700 million propping up coal plants, declaring coal supply chains essential to national defense. No bill was introduced. No committee held a hearing. No vote was taken. The administration also dismantled a $368 million ocean monitoring network through an agency decision, not legislation, after Congress funded the program twice.

Discharge petitions surged

When leadership blocks a vote, 218 House members can sign a discharge petition to force one. Since 1935, only 7 discharge petitions have produced a law. But 7 petitions reached the 218-signature threshold under Speaker Johnson since 2023, matching the previous four decades combined. The Social Security Fairness Act passed this way in 2024 with a 352-75 House vote.

Where you fit in this process

The legislative process has multiple entry points for constituent pressure. The evidence says it works.

Committee staff process constituent contact on specific bills. A call to a committee member’s office about a bill in their jurisdiction carries more weight than a general message to your own representative. Both matter, but timing and specificity determine impact.

When to act at each stage

How to make your contact count

1. Reference the bill number. “I’m calling about H.R. 5785” tells staff exactly what you care about.
2. Ask for one specific action. “Please co-sponsor this bill” or “please vote no on this amendment.”
3. Identify yourself as a constituent. Include your name and address. Staff verify residency. Constituent contact gets prioritized over out-of-district messages.
4. Keep it short. Three sentences is enough. Staff process hundreds of contacts per day.
5. Personalize it. Adding your own words to the subject line and opening sentence increases impact by 37% compared to form emails.

Track bills and find your representatives at Congress.gov. Send letters through Resistbot (text RESIST to 50409) or Democracy.io. Both verify your address and route your message to the right office.

For ready-to-send letter templates on current legislation, see our letter library.

Last updated June 4, 2026