In California, a bill becomes law by moving through a set sequence: a legislator introduces it, policy committees and the full house of origin vote on it, the second chamber repeats the process, and the governor signs it or lets it become law without a signature. Most bills that clear every step take effect the following January 1. Here is how a California bill becomes law, stage by stage, with the deadlines and vote thresholds that decide whether it survives.
Drafting and Introduction
Ideas for bills come from constituents, advocacy groups, state agencies, and legislators themselves, but only a sitting member of the Legislature can formally introduce one. A senator introduces bills in the Senate; an Assembly member introduces in the Assembly.1California State Senate. Legislative Process
Once a legislator commits to moving a proposal forward, it goes to the Office of Legislative Counsel, the nonpartisan state agency that turns policy ideas into proper legal language. Under Government Code Section 10231, Legislative Counsel drafts, amends, and assists with legislative measures at the request of legislators.2Justia. California Government Code 10230-10248 – Duties The author and interested parties review the draft to confirm it captures their intent.
If a bill would affect state spending or revenue, a fiscal analysis is prepared estimating the projected costs and identifying which state funds would cover implementation.3California Department of Finance. Analysis: Principles and Practices for DOF Analysts Bills with no fiscal impact skip this step. Once the text is finalized, the bill is introduced at the desk of the originating house and assigned a number: AB for Assembly, SB for Senate.
Committee Hearings and Floor Votes
After introduction, a bill cannot be heard in committee or voted on for at least 30 days. That waiting period gives legislators time to read the measure.4Justia. California Constitution Article IV Section 8 – Legislative During the first reading, the bill number and title are read on the floor, and the measure is assigned to one or more policy committees based on its subject.
Most of the real work happens in committee. The author presents the bill, supporters and opponents testify, and committee members ask questions before voting. Hearings are open to the public, and anyone can submit a position letter or, in many cases, give brief in-person testimony. A bill that carries a cost to the state also goes to the Appropriations Committee for fiscal review after clearing its policy committee.
A bill that survives committee moves to a second reading on the floor, where amendments can still be added. The third reading is the final floor vote and is preceded by debate. Most bills need a simple majority: 41 votes in the Assembly or 21 in the Senate. Urgency measures and bills meant to take effect immediately require a two-thirds supermajority: 54 votes in the Assembly or 27 in the Senate.5Official California Legislative Information. Overview of Legislative Process The final text must also be published online for at least 72 hours before the vote.4Justia. California Constitution Article IV Section 8 – Legislative
Crossing to the Second Chamber
A bill that passes its house of origin crosses over to the other chamber, where the committee-and-floor-vote process repeats. If the second house passes the bill unchanged, it goes straight to the governor. If the second house amends the bill, it returns to the house of origin, which must vote to accept those amendments. That step is called concurrence.
When the two houses cannot agree on the final language, a conference committee may be appointed. This six-member panel includes three legislators from each house, chosen by the Speaker and the Senate President pro Tempore, and meets to negotiate a compromise. Its work product is a conference report specifying the agreed amendments. At least two members from each house must approve the report before it returns to the full Assembly and Senate for an up-or-down vote with no further floor amendments allowed.
The Governor’s Decision
Once a bill passes both chambers in identical form, it goes to the governor. Under Article IV, Section 10 of the California Constitution, the governor has three options.6Justia. California Constitution Article IV Section 10 – Legislative
- Sign the bill, which turns it into a statute.
- Veto the bill and return it to the house of origin with a written explanation.
- Take no action. If the governor does not act within 12 days during the session, the bill becomes law without a signature. For bills still in the governor’s possession after the Legislature adjourns for its joint recess, that window extends to 30 days.6Justia. California Constitution Article IV Section 10 – Legislative
For appropriation bills, the governor also has a line-item veto, which allows reducing or eliminating specific spending items while signing the rest of the bill into law.6Justia. California Constitution Article IV Section 10 – Legislative
The Legislature can override a veto by a two-thirds vote in each chamber: 54 in the Assembly, 27 in the Senate. In practice, overrides almost never happen. The last successful California veto override was in 1979.
When the Law Takes Effect
Most bills signed into law take effect on the January 1 that follows a 90-day period after the governor’s signature.4Justia. California Constitution Article IV Section 8 – Legislative Because most bills are signed between mid-summer and early fall, the January 1 date is what matters for the public. Each new year brings a wave of new California laws.
Urgency statutes, tax levies, and appropriations for the state’s current expenses take effect immediately upon signing.4Justia. California Constitution Article IV Section 8 – Legislative An urgency bill must include a statement explaining why it needs to take effect immediately to protect public peace, health, or safety. Both the urgency clause and the bill itself require separate two-thirds votes in each house.
After a bill is signed or becomes law without a signature, the Secretary of State assigns it a chapter number. That chapter number, not the original bill number, becomes the official reference in the California Statutes.7California Secretary of State. Bill Chapters
Key Deadlines in the Two-Year Session
California’s Legislature operates on a two-year cycle. Both houses convene in December after the November election to organize, then begin their first regular session in January of the odd-numbered year. They meet through mid-September, recess, reconvene in January of the even-numbered year, and work through a final adjournment on November 30.
Legislators can introduce bills in either year of the session. A bill introduced in the first year that does not pass its house of origin by January 31 of the second year is dead and cannot move forward. The crossover deadline is a critical checkpoint for any bill’s viability.
There is no formal limit on how many bills a single legislator can introduce, though Assembly and Senate rules have at times imposed informal caps. The practical constraint is time. With thousands of bills competing for limited committee slots, a bill that misses key deadlines quietly dies regardless of its merits.
Checking a Bill’s Status
The California Legislative Information website at leginfo.legislature.ca.gov is the official source for bill text, status, and vote history.8California Legislative Information. Bill Search You can search by bill number, author name, or keywords. The site provides the full text of every version of a bill, the complete legislative history with every committee and floor vote, and any analyses prepared along the way. Measures predating 1999 are available on an archived version of the site at leginfo.ca.gov.
If you need to follow a bill without checking the site daily, the bill-tracking feature sends email alerts whenever the status changes, new amendments post, or a hearing is scheduled. Bills can move through committee quickly in the final weeks of session, so setting up alerts early is worthwhile for any measure that affects you.