(a)
With respect to service of a member employed as a full-time employee and service performed by a member employed as a part-time employee, any period of time covering a pay period during which a member is on an unpaid leave of absence or a pay period in which a member has not performed any creditable service.(b)
For a member who has been employed in a substitute position:(1)
And has a change in assignment during a school year to a full-time or part-time position, a break in service is determined on the same basis as for the full-time or part-time employment during the same school year.(2)
For less than 50 percent of their teaching career for which service is credited, a break in service is determined on the same basis as full-time employment.(3)
For more than 50 percent of their teaching career for which service is credited, a break in service is any period of time within a school year for which compensation is not paid and service is not credited.(c)
If a member commenced performing service at the beginning of a school term, the months not recognized as part of the school term are not a break in service; however, if the member commenced performing service after the school term began, or did not complete the school term, the months not recognized as part of the school term are a break in service. The school term shall be no less than the days or hours specified as full time in Section 22138.5.(d)
Earnable salaries for a full pay period, but not beyond the effective date of retirement, shall be used in determining final compensation when the member performed service within that pay period.
Source:
Section 22109.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=EDC§ionNum=22109.5..