How a bill becomes law

The textbook version — "a bill is introduced, both chambers vote, the President signs it" — is true but hides where the real action is. Most bills never get a vote at all. Here's the route a bill actually travels, step by step.

1. Introduction

Any member of the House or Senate can introduce a bill. It gets a number with a prefix that tells you where it started: H.R. for the House of Representatives, S. for the Senate. (You'll see these on every Pass or Trash post.) Introduction is cheap and common — thousands of bills are introduced each year, and the vast majority go no further.

2. Committee — where most bills die

The bill is referred to one or more committees with jurisdiction over its subject. Committees hold hearings, mark up (amend) the text, and vote on whether to advance it. This is the real filter. If committee leadership never schedules a bill, it simply expires at the end of the two-year Congress. Clearing committee is the single biggest hurdle most legislation faces.

3. Floor scheduling and debate

A bill that survives committee still has to be scheduled for a floor vote by chamber leadership — another point where a bill can stall indefinitely. Once scheduled, it's debated and can be amended further before a vote.

4. The first chamber votes

The chamber where the bill originated votes. In the House, a simple majority passes it. The bill then goes to the other chamber, which can pass it, change it, or ignore it.

5. The Senate and the filibuster

The Senate has a wrinkle the House doesn't: most legislation needs 60 votes to end debate (cloture) before it can get an up-or-down vote. That 60-vote threshold — the filibuster — is why a bill can have majority support and still fail. A narrow set of budget bills can bypass it through a process called reconciliation.

6. Reconciling the two versions

Both chambers must pass identical text. If the House and Senate versions differ, they reconcile them — often through a conference committee — and each chamber votes again on the merged bill.

7. The President

Once both chambers pass the same text, it goes to the President, who can:

• Sign it — it becomes law.
• Veto it — it returns to Congress, which can override with a two-thirds vote in both chambers (rare).
• Do nothing — after 10 days it becomes law anyway, unless Congress has adjourned (a "pocket veto").

Where the cost estimate fits in

Somewhere after a bill clears committee, the Congressional Budget Office usually publishes a cost estimate — its projection of how the bill would affect the federal deficit. That's why a freshly introduced bill often has "no CBO estimate yet": the official number simply hasn't been produced.

The short version

Introduced → committee → floor vote in each chamber → reconcile → President. At nearly every arrow, a bill can stall and die — which is why following which bills are actually moving tells you far more than the headline count of bills introduced. That's exactly what Pass or Trash tracks: the bills with real momentum, scored and put to a vote.