How to Track Legislation: Bills vs. Laws, Explained

Short answer: to track legislation, use a bill tracker or the legislature's own website to follow a proposal until it is signed. Then read the official code to see what the law now says. A bill is a proposal. A statute is an enacted law, one that has passed and been signed. Editors then merge its words into the code (the organized, subject-by-subject book of laws). Tracking tools tell you what lawmakers are doing. The code tells you what you must do.

TL;DR

• A bill can change, stall or die. A statute is a bill that passed, was signed and now sits in the code.
• Codification is the step civics pages skip. Editors fold the new law into the code, and section numbers can move.
• Bill trackers follow status, votes and sponsors. Code publishers carry the final text and its citation.
• Watch four things: the bill's status, its effective date, the text as amended and the final codified section.
• One law has three numbers: a bill number, a public law number and a code citation.

How to track legislation: start with what a bill is

Say your company must follow a data rule that lawmakers are changing. You hear that "a bill is moving." What does that mean?

A bill is a draft law with a sponsor, the lawmaker who introduced it. Most bills follow the same path:

1. A lawmaker introduces it, and it is sent to a committee, a small group that studies it.
2. The committee may change it, vote on it or leave it alone.
3. Each chamber votes. Most legislatures have two, such as a House and a Senate, and both must pass the same text.
4. The president or governor signs it. A veto sends it back, and lawmakers can sometimes override.
5. The signed bill becomes a session law, meaning a law published in the order passed. At the federal level, it gets a public law number.
6. Editors codify it.

Our guide to session laws and the code covers step five in more detail.

Codification: the step that changes the numbers

Codification means placing the new law into the code. An editor decides where each piece goes. A new rule may become a new section. A change may rewrite an existing section. Sections can be renumbered to make room. For federal law, the Office of the Law Revision Counsel of the House of Representatives prepares the United States Code. Each state has its own editors.

When you write a law into a policy or a contract, cite the code section.

One real bill, traced to the code

Take Senate Bill 146 of the 119th Congress (the two-year Congress that began in January 2025), the TAKE IT DOWN Act. It concerns intimate images shared without consent, including AI fakes.

The bill's life. Senator Ted Cruz introduced it on January 16, 2025. The Senate passed it on February 13, 2025, by unanimous consent, meaning no senator objected. The House passed the same text on April 28, 2025, by a vote of 409 to 2. The President signed it on May 19, 2025. Congress.gov, the Library of Congress site for federal bills, records the final status as "Became Public Law No: 119-12." The signed act is also on the GovInfo site.

The session law. Public Law 119-12 is printed at page 55 of volume 139 of the Statutes at Large, the federal series of session laws. The bill number, S. 146, restarts every two-year Congress. The public law number does not.

The code. Now see where the pieces landed:

• Section 2 of the act, a criminal rule against sharing such images, became 47 U.S.C. § 223(h), meaning Title 47 of the United States Code, section 223, subsection (h). The act itself renamed the old subsection (h) as (i) to make room, and the code shows that.
• Section 3 requires covered online platforms to set up a takedown request process and to remove a flagged image within 48 hours of a valid request. It became 47 U.S.C. § 223a. The bill said "not later than 1 year after the date of enactment." The code replaced that with a fixed date: "Not later than 1 year after May 19, 2025."
• The code's own note says section 223a came from the TAKE IT DOWN Act, even though it sits in a chapter built from the Communications Act of 1934.

The credit line at the bottom of 223a reads "Pub. L. 119-12, § 3, May 19, 2025, 139 Stat. 59." That line is your map back from the code to the session law.

One idea now has three labels: S. 146, Public Law 119-12 and 47 U.S.C. § 223a. A policy document should cite the last one.

Who tracks what

Bill trackers follow proposals. LegiScan follows bills in the states and Congress. Open States publishes open data on state legislatures. GovTrack follows Congress, and says on its site that it is not a government website. BillTrack50 tracks state and federal bills and regulations. Each legislature's own site is the official source for its bills. Our guides to the LegiScan API, the Open States API and the Congress.gov API cover how engineers use them.

Code publishers carry the law as it now reads. For federal law, that is the House's US Code site. For a state, it is the legislature's site or the revisor's site, meaning the state office that edits and publishes the code. Their records are organized by section of law.

Both are good at their own job. A tracker organizes its records around bills. A code publisher organizes its records around sections.

What a compliance or government-affairs person should watch

Status. Introduced, passed one chamber, sent to the governor, signed or vetoed. A bill becomes law when it is signed, when lawmakers override a veto, or, in some places, when the executive takes no action in time.

Effective date. A law can start on a different day than the signing day. The act's text says when. In our example, the platform duty came due one year after May 19, 2025.

The text as amended. Bills change in committee and on the floor. The version you read in January may differ from the one that passed. Read the final version.

The final codified section. This is the citation you put in a policy, a contract or a checklist. Check it again if the code is later amended, since sections can shift.

What goes wrong

• You treat "passed" as "in force." A bill may pass and still start months later.
• You read an early draft. Amendments change what the bill does.
• You cite the bill number. It will not help a reader find the law next year.
• You use an old section number. Renumbering is routine, as with subsection (h) above.
• You assume a tracker covers everything. City ordinances and agency rules often live on other sites.

Questions to ask before you pick a tool

1. Which governments does it cover, and does that match mine?
2. Does it show the final signed text and the effective date?
3. How quickly does it update a bill's status?
4. Does it link a passed bill to the code section it changed?

If you are weighing data sources, see our ten questions to ask a legal data vendor. For the wider vocabulary, see primary law explained and our guide to citing a statute or regulation.

This is general information, not legal advice. For a risky decision, ask a lawyer licensed in your state.

This guide is part of US Law Data: The Complete Guide, a map of where US law comes from and how to use it.

FAQ

How do I track a bill in my state? Start with your state legislature's website, which usually has a bill search and email alerts. Free and paid trackers can cover several states at once. Whichever you use, confirm a bill's final status on the legislature's own site.

What is the difference between a bill and a law? A bill is a proposal that has not been enacted. A law exists once the bill has passed and been signed, or a veto has been overridden. In some places it also becomes law if the executive takes no action in time. A law is then published as a session law and folded into the code.

What is codification? Codification is the step where editors merge a new law into the code, which is sorted by subject. It can add sections, rewrite sections and renumber them. The code then shows the law as amended.

Is bill tracking the same as legal research? No. Bill tracking follows what lawmakers do. Legal research reads what the law says now, and what it meant when it was passed. You usually need both.

What is legislative tracking software? It is a service that watches bills for you and sends alerts when a status changes. Many also let you tag bills, share lists and export reports. Check which governments it covers, and whether it shows final text.

How do I find the current law after a bill passes? Look at the act's text for the section it amends, then read that section in the official code. The credit line at the bottom of the section names the act, and the history lines list every later change.

Need current statute and regulation text for your product? See the Vaquill AI legal data API.

Priyansh Khodiyar

Co-Founder & CTO

Priyansh leads engineering and AI at Vaquill AI: the pipelines that pull statutes, regulations and court rules from every US jurisdiction's official publisher, and the REST API, MCP server and open dataset that serve them.