Cal. Const. art. IV, § 10

(a) Each bill passed by the Legislature shall be presented to the Governor. It becomes a statute if it is signed by the Governor. The Governor may veto it by returning it with any objections to the house of origin, which shall enter the objections in the journal and proceed to reconsider it. If each house then passes the bill by rollcall vote entered in the journal, two-thirds of the membership concurring, it becomes a statute.

(b) (1) Any bill, other than a bill which would establish or change boundaries of any legislative, congressional, or other election district, passed by the Legislature on or before the date the Legislature adjourns for a joint recess to reconvene in the second calendar year of the biennium of the legislative session, and in the possession of the Governor after that date, that is not returned within 30 days after that date becomes a statute.

(2) Any bill passed by the Legislature before September 1 of the second calendar year of the biennium of the legislative session and in the possession of the Governor on or after September 1 that is not returned on or before September 30 of that year becomes a statute.

(3) Any other bill presented to the Governor that is not returned within 12 days becomes a statute.

(4) If the Legislature by adjournment of a special session prevents the return of a bill with the veto message, the bill becomes a statute unless the Governor vetoes the bill within 12 days after it is presented by depositing it and the veto message in the office of the Secretary of State.

(5) If the 12th day of the period within which the Governor is required to perform an act pursuant to paragraph (3) or (4) of this subdivision is a Saturday, Sunday, or holiday, the period is extended to the next day that is not a Saturday, Sunday, or holiday.

(c) Any bill introduced during the first year of the biennium of the legislative session that has not been passed by the house of origin by January 31 of the second calendar year of the biennium may no longer be acted on by the house. No bill may be passed by either house on or after September 1 of an even-numbered year except statutes calling elections, statutes providing for tax levies or appropriations for the usual current expenses of the State, and urgency statutes, and bills passed after being vetoed by the Governor.

(d) The Legislature may not present any bill to the Governor after November 15 of the second calendar year of the biennium of the legislative session.

(e) The Governor may reduce or eliminate one or more items of appropriation while approving other portions of a bill. The Governor shall append to the bill a statement of the items reduced or eliminated with the reasons for the action. The Governor shall transmit to the house originating the bill a copy of the statement and reasons. Items reduced or eliminated shall be separately reconsidered and may be passed over the Governor’s veto in the same manner as bills.

(f) (1) If, following the enactment of the budget bill for the 2004–05 fiscal year or any subsequent fiscal year, the Governor determines that, for that fiscal year, General Fund revenues will decline substantially below the estimate of General Fund revenues upon which the budget bill for that fiscal year, as enacted, was based, or General Fund expenditures will increase substantially above that estimate of General Fund revenues, or both, the Governor may issue a proclamation declaring a fiscal emergency and shall thereupon cause the Legislature to assemble in special session for this purpose. The proclamation shall identify the nature of the fiscal emergency and shall be submitted by the Governor to the Legislature, accompanied by proposed legislation to address the fiscal emergency.

(2) If the Legislature fails to pass and send to the Governor a bill or bills to address the fiscal emergency by the 45th day following the issuance of the proclamation, the Legislature may not act on any other bill, nor may the Legislature adjourn for a joint recess, until that bill or those bills have been passed and sent to the Governor.

(3) A bill addressing the fiscal emergency declared pursuant to this section shall contain a statement to that effect.