What is the difference between a Senate bill and a House bill?

Senate bills (S.) are introduced by Senators and begin in the Senate. House bills (H.R.) are introduced by Representatives and begin in the House. Both must ultimately pass both chambers to become law. The main difference is that revenue (tax) bills must originate in the House, and the Senate has the filibuster which can block legislation unless 60 senators vote for cloture.

How many senators need to vote for a bill to pass?

A simple majority of 51 votes (or 50 plus the Vice President as tie-breaker) is needed to pass most legislation. However, 60 votes are needed to invoke cloture and end a filibuster, which is often the practical threshold for passing legislation in the Senate.

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What Is a Senate Bill?

Q: What is a Senate bill?

A Senate bill (designated with "S." followed by a number) is a piece of proposed legislation introduced by a U.S. Senator. It must pass both the Senate and the House of Representatives, then be signed by the President, to become law.

A Senate bill is a piece of proposed legislation introduced by a member of the United States Senate. Understanding Senate bills helps you follow what Congress is doing and how it affects you.

The Basics

Designation: Senate bills are labeled with "S." followed by a number (e.g., S. 1, S. 456).
Who introduces them: Any of the 100 U.S. Senators can introduce a Senate bill.
Legal force: Senate bills can become federal law if passed by both the Senate and House, then signed by the President.
Numbering: Bills are numbered sequentially starting from S. 1 at the beginning of each new Congress (every 2 years).

Senate Bill vs. House Bill

Feature	Senate Bill (S.)	House Bill (H.R.)
Introduced by	Senator	Representative
Members in chamber	100	435
Votes to pass	51 (60 to overcome filibuster)	218
Can originate tax bills?	No	Yes (required by Constitution)
Has filibuster?	Yes	No

How a Senate Bill Becomes Law

A Senator introduces the bill on the Senate floor.
The bill is referred to a committee for review, hearings, and markup.
If approved by committee, the bill goes to the full Senate for debate and vote.
The Senate must reach cloture (60 votes) to end debate if a filibuster is threatened.
A simple majority (51 votes) passes the bill.
The bill moves to the House of Representatives which must also pass it.
If both chambers agree, the bill goes to the President for signature.

The Filibuster: The Senate's Unique Feature

Unlike the House, the Senate allows unlimited debate on most legislation. This means a single Senator can "filibuster" — speak indefinitely to block a vote. To end a filibuster, 60 out of 100 Senators must vote for "cloture." This is why many important bills need 60 votes to effectively pass the Senate, even though only 51 votes are technically required for final passage.

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