In California, your final paycheck is due immediately, at the time of termination if you are fired, and within 72 hours, or immediately if the employee gave at least 72 hours notice if you quit.
Final paycheck deadline in California
If you are fired or laid off
Immediately, at the time of termination
If you quit
Within 72 hours, or immediately if the employee gave at least 72 hours notice
What your final pay must include
Your final paycheck must include all the wages you earned through your last day. Whether it also has to include unused vacation depends on your state and your employer's policy, some states treat accrued vacation as wages that must be paid out. See California PTO payout rules. If an employer misses the deadline, many states add penalties. This is general information, not legal advice.