Ballot initiative mechanics in California

This page covers California's specific rules. For the general mechanics, see how ballot initiatives work. California allows citizens to propose both constitutional amendments and statutes, plus veto referendums.

California's process

The threshold depends on what kind of measure it is. A constitutional amendment needs signatures equal to 8 percent of the votes cast for governor in the last election (874,641 for the 2026 cycle). A statute or veto referendum needs 5 percent (546,651 for 2026).

The clock starts when the Attorney General issues the official title and summary for the proposed measure. From that point, sponsors have 180 days to circulate and collect signatures. There is no geographic distribution requirement: signatures can come from any county in any proportion. Every initiative must stick to a single subject. Filing costs $2,000, paid to the Attorney General when submitting the initiative text. That fee is refunded if the measure qualifies within two years and forfeited to the General Fund otherwise.

After submission, the Secretary of State verifies signatures using a random sample. Collecting more than 110 percent of the required count qualifies the measure outright. Falling under 95 percent fails it. Anything between 95 and 110 percent triggers a full signature count, completed within 60 working days.

Deadlines and numbers

• Constitutional amendment: 8 percent of last gubernatorial vote (874,641 for 2026)
• Statute or veto referendum: 5 percent of last gubernatorial vote (546,651 for 2026)
• Circulation window: 180 days from Attorney General title/summary issuance
• Filing fee: $2,000 (refundable if the measure qualifies within 2 years)
• Verification thresholds: over 110 percent qualifies outright, under 95 percent fails, 95-110 percent triggers a full count within 60 working days
• 2026 Secretary of State final qualification deadline: June 25, 2026

Where to go

• How to qualify an initiative (Secretary of State): https://www.sos.ca.gov/elections/ballot-measures/how-qualify-initiative
• Signature requirements (secondary reference): https://ballotpedia.org/Signature_requirements_for_ballot_measures_in_California

Rules

California's process is well-documented and comparatively predictable: fixed dollar filing fee, fixed circulation window, no geographic distribution rule to navigate, and a clear random-sample verification method with published thresholds. The main variable sponsors have to track each cycle is the raw signature count, since both thresholds are percentages of the last gubernatorial vote and shift as turnout changes.

The single-subject rule is enforced but has generated significant litigation over the years about how broadly "single subject" can be interpreted, so measures that bundle related-but-distinct provisions sometimes face court challenges after qualifying. This dossier found no open gaps in California's mechanics. For help building a signature campaign or evaluating a proposed measure, see /engage.