The California Legislature is the state’s lawmaking body, a two-chamber institution made up of an 80-member State Assembly and a 40-member State Senate that together write the statutes governing nearly 40 million residents. Both chambers meet at the State Capitol in Sacramento, and a bill becomes law only when identical language passes both houses and the governor signs it (or lets it become law without a signature).
Two Chambers, 120 Members
California has a bicameral legislature. The Assembly’s 80 members each represent a district of roughly 494,000 people. The Senate’s 40 members each represent about 988,000.1California State Senate. Senators
Assembly members serve two-year terms, and every Assembly seat is on the ballot in even-numbered years. Senators serve four-year terms on a staggered schedule, so only half the Senate faces voters in any given cycle.2Justia Law. California Constitution Article IV – Legislative – Section 2 The Assembly turns over entirely every two years; the Senate does not.
Each chamber picks its own leader. The Assembly elects a Speaker, and the Senate elects a President pro Tempore. Those leaders control committee assignments and set the agenda, which gives them substantial say over which bills move and which stall.
Who Can Serve and for How Long
A candidate for the Legislature must be a United States citizen, a California resident for at least three years, and a resident of the district for at least one year before the election.2Justia Law. California Constitution Article IV – Legislative – Section 2
Under Proposition 28, approved by voters in 2012, anyone first elected to the Legislature after that date can serve a lifetime maximum of 12 years.3Office of the Chief Clerk. Elected Officials Those 12 years can be spent entirely in the Assembly, entirely in the Senate, or split between the two in any combination. Members who were already in office when Proposition 28 passed remain under the older rules, which capped service separately in each chamber.4California Legislative Analyst’s Office. Proposition 28 – Limits on Legislators Terms in Office – Initiative Constitutional Amendment
How a Bill Becomes Law
Every bill starts with a single author, either an Assembly member or a Senator. Once introduced, it gets a number and a first reading (the title is read on the floor), and the Rules Committee assigns it to a policy committee based on subject matter.5California State Senate. Legislative Process
The policy committee is where most of the real work happens. It holds a public hearing, takes testimony from supporters and opponents, can amend the bill, and votes on whether it advances. A bill with a fiscal impact then goes to the Appropriations Committee before reaching the floor. Bills with meaningful costs are often placed on a “suspense file,” where the committee weighs the combined fiscal impact of many bills together at a single vote-only hearing. Suspended bills either advance or quietly die there.6Senate Appropriations Committee. FAQs
On the floor, the bill gets a second reading (when further amendments can be offered), then a third reading for a final vote. Most bills need a simple majority: 41 votes in the Assembly or 21 in the Senate. Urgency measures and appropriation bills need a two-thirds vote: 54 in the Assembly or 27 in the Senate.7California State Assembly. Legislative Process
Once a bill clears its house of origin, it crosses to the other chamber and runs the full gauntlet again: committee hearing, floor debate, final vote. If the second house amends it, the first house must concur in the changes. When both chambers have passed identical language, the bill goes to the governor.
Not every measure follows that path. Constitutional amendments require a two-thirds vote of both houses and then majority approval from the voters; the governor plays no formal role.8California Department of General Services. SAM 6920 – Constitutional Amendments Urgency bills, once signed, take effect immediately rather than waiting for the following January 1.9California State Capitol Museum. Life Cycle of a Bill
When the Legislature Meets
The Legislature works in two-year sessions and considers thousands of bills in each one. The calendar is governed by firm deadlines in the Joint Rules and the state constitution. A few 2026 dates give a sense of the pace:
- February 20: last day to introduce new bills.
- May 29: last day for each house to pass bills that originated in that house.
- June 15: constitutional deadline for passing the state budget.
- August 31: last day for either house to pass any bill.
The Legislature usually recesses in July and returns in early August for the final stretch before the August 31 cutoff.10California State Senate. Legislative Deadlines The session adjourns at the end of November, and a new two-year session convenes in early December.
The Governor’s Role
Once both chambers pass a bill, the governor can sign it, let it become law without a signature, or veto it. During the regular session the governor generally has 12 days to act, and inaction within that window lets the bill become law. For bills that reach the governor’s desk after the Legislature adjourns, the deadline runs to September 30.11California Legislative Information. California Constitution Article IV – Section 10
On budget and other appropriation bills, the governor has line-item veto power, meaning individual spending items can be struck or reduced while the rest of the bill is signed. For non-appropriations bills, it’s all or nothing.11California Legislative Information. California Constitution Article IV – Section 10
A two-thirds vote of both houses can override a veto, but this almost never happens. The last successful override was in the 1979–80 session.
How the Budget Is Different
The annual state budget runs on its own track. The governor submits a proposed budget to the Legislature in January, and the constitution requires lawmakers to pass a budget bill by June 15.12California Department of Finance. California’s Budget Process Miss that deadline and legislators forfeit their salary and per diem for every day they’re late, a consequence added by Proposition 25 in 2010.
Proposition 25 also dropped the budget vote threshold from a two-thirds supermajority to a simple majority, which largely ended the months-long budget standoffs that were common before 2010. Tax increases, though, still require a two-thirds vote in each chamber.
How to Weigh In
You don’t need to be a lobbyist to engage with the process. The most direct options are contacting your legislator’s district office, writing a position letter on a specific bill, and attending a committee hearing to testify in person.13California State Senate. Legislative Process Booklet All committee hearings are open to the public, and some allow remote participation by phone.
If you plan to testify, prepare your remarks in advance, keep them brief and specific, and let the bill’s author know you intend to speak. Written position letters submitted to the committee become part of the public record on the bill. Timing is what makes any of this count: a letter that arrives after the committee vote has little effect, so tracking the legislative calendar is worth the effort.