Under California law, an employee is presumed to be “at-will” employee unless agreed otherwise. Cal. Labor Code section 2922. “At will” means that an employee can be terminated for any reason, no reason, or arbitrary reason, as long as it’s not an unlawful reason (such as discriminatory or retaliatory discharge, to name a few).
There is a number of laws and ways in which the presumption of at-will employment can be defeated, as might be necessary in order to prove a wrongful termination claim. Some of those laws are stronger and more definite while others are more vague and are not applied by all courts equally in California. Below is a number of the more compelling ways to defeat at-will employment presumption.
An express agreement that employment is other than at-will of course defeats the at-will employment presumption. Thus, most union employees are not at-will employees as their contract with the employer – the collective bargaining agreements – almost always provides that an employee can be only terminated for good/just cause. Additionally, personnel manuals that list specified grounds for discharge are evidence of an implied-in-fact contact to terminate only for good cause.