What HR does a California startup need at each funding stage?

Founders think about startup HR by funding round, not by headcount, so this guide is organized that way. It is a companion to California HR laws by headcount, which lists every legal threshold. Headcounts below are typical for each stage, not rules.

Pre-seed: the first one to five people

• Classify correctly from day one. A “contractor” doing core product work is almost always an employee under the ABC test, and misclassification penalties run $5,000 to $25,000 per violation.
• Register with the state Employment Development Department within 15 days of first paying wages, and carry workers’ compensation insurance before the first employee starts.
• Use offer letters with at-will language, no noncompete, which is void in California, and no stay-or-pay repayment clause, which California bans in contracts signed from January 1, 2027. See the noncompete guide.
• Get equity grants approved by the board and documented, and complete an I-9 within three business days of each start date.
• Provide paid sick leave and register with CalSavers if you offer no retirement plan.

Seed: five to fifteen people

• At 5 employees: harassment prevention training for everyone, with supervisors trained within six months of taking the role, and CFRA family leave rights.
• A short, California-specific handbook covering leave, breaks, expense reimbursement and complaints.
• A written workplace violence prevention plan, which applies to most employers from the first employee.
• Check any team member working from San Francisco, Berkeley or another city with local rules; see the Bay Area ordinances hub.

Series A: fifteen to fifty people

• At 15 employees: a good-faith pay range in every job posting. That requires a leveling structure first; see how to set a pay range.
• At 20 with anyone working in San Francisco: health care spending under the city’s HCSO, plus paid parental leave supplements.
• Performance reviews and documentation, because the first terminations usually happen here, and final pay is due the same day.
• A pay equity check before the round’s hiring push, while fixing gaps is still cheap.
• A decision about HR ownership. At this stage most companies choose between a PEO, a fractional HR lead and a first HR hire; the comparison with real cost math walks through all three.

Past 50

At 50 full-time equivalent employees, federal ACA employer mandate rules begin. At 75, California’s WARN Act applies to layoffs; at 100, annual pay data reporting. By then HR should be a function with an owner, not a side task for a founder.

This is the stage where most founders bring in a fractional HR director, a part-time HR lead, instead of a PEO for HR judgment or a first full-time hire; the cost comparison shows the math. HR for startups at Series A is mostly pay ranges, classification and a handbook set before the team doubles.

The cheapest time to build this is before the round closes, not after the first complaint. A compliance check-up at seed usually finds three to five fixes that take a week, instead of a year of back pay later.

McKinley holds a J.D. but is not a licensed attorney. Articles here are general information, not legal advice. For your specific situation, talk with an employment attorney.

Data current as of September 2026. Sources are linked where each figure appears.