This is the most common expensive mistake in California employment law, and it is almost always made in good faith. Someone is promoted, given a title with the word manager in it, moved onto a salary, and everyone involved believes that settles it. It does not.
Two tests apply and both have to be met. The salary test sets a floor tied to the state minimum wage, so it moves when the minimum wage moves, which means a classification that was correct two years ago can quietly stop being correct without anyone touching it. The duties test asks what the person actually does, and California applies it quantitatively: more than half their working time must be spent on exempt duties.
That quantitative standard is where most misclassifications live. A shift supervisor who spends sixty percent of the day doing the same work as the team they supervise is doing non-exempt work for most of the week, whatever their title says and whatever they are paid.
The cost compounds because it repeats. An employee misclassified for two years has unpaid overtime for every week of those two years, plus meal and rest period exposure, plus the wage statement problems that follow from both. It is never one mistake. It is the same mistake multiplied by every pay period it survived.
Job descriptions are not evidence of anything on their own. What matters is the work, and the fastest way to find a problem is to ask the person what they did last Tuesday.
What you can do
Check the salary floor against the current minimum wage each January, because the floor moves and classifications do not move with it.
For each exempt role, estimate the percentage of time genuinely spent on exempt duties. Anything near half deserves a closer look.
Ask the employee what they actually do, rather than reading the job description written when the role was created.
Look hardest at working supervisors and at anyone whose title changed without their day changing.
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