PEO companies in California: costs, scores and the rules that matter

No state license: what to check instead

Some states make PEOs register and publish the list. California does not. That shifts the due diligence to you:

• IRS CPEO status. For wages a certified PEO pays, the CPEO is treated as the employer for federal employment taxes. With a non-certified PEO, the client generally stays liable. Match the exact entity name on our IRS certified PEO list.
• The service agreement. Who is the employer for California wage and hour claims, and who pays if a filing is wrong?
• EDD accounts. Ask whether your unemployment and SDI reporting runs under the PEO's Employment Development Department account or yours.

Of the top 5 PEOs we score, all have an entity on the IRS active list dated August 7, 2026. BBSI, Rippling PEO and Vensure were not found under those names; they may certify under another entity.

California PEO rankings

The order follows our published scores. Justworks is the only PEO here with a list price. TriNet (50) has the best-documented support hours of the group: 24/7 chat and phone from 6 a.m. to midnight Eastern on weekdays, which covers the full California business day.

See the TriNet PEO review and Insperity review for evidence. Insperity charges a fixed per-employee HR fee that it says does not rise when you raise pay, which matters with California wage floors climbing.

Cost for 10 California employees

California is a high-tax state for employees, but the employer's state payroll taxes are modest: UI and ETT on the first $7,000. SDI is 1.3% of all wages with no cap since January 1, 2024, and it is withheld from employees, not paid by you. The table assumes $50,000 salaries.

Watch the FUTA line. California is on DOL's potential 2026 credit reduction list: 1.5% on the first $7,000 would add $105 per employee, and 5.3% would add $371 if the benefit cost rate add-on applies. Our PEO cost guide explains how health premiums and workers' comp sit on top of these numbers.

California rules a PEO has to get right

California payroll mistakes are expensive, and these are the rules most often involved:

• Final pay: immediately when you fire someone; within 72 hours if they quit without notice; on the last day if they gave 72 hours' notice. Accrued vacation is included.
• Paydays: at least twice each calendar month on set days (Labor Code 204); exempt staff may be paid monthly.
• Minimum wage: $16.90 in 2026, rising to $17.40 on January 1, 2027, with an exempt salary floor of $72,384. No tip credit.
• Workers' comp: required with 1 or more employees, from private carriers, State Compensation Insurance Fund or self-insurance.
• Supplemental withholding: 6.6%, or 10.23% for bonuses and stock options.

San Francisco levies business taxes measured partly by payroll; there is no local wage tax. See the California payroll tax guide for EDD links.

Benefits complaints to read before you sign

Health plans are a main reason California firms join a PEO, and also a main source of complaints. TriNet's most common recent theme on Trustpilot is rejected FSA claims from worksite employees (July and August 2026). An ADP TotalSource reviewer wrote that plans were "limited to just Aetna health plans that increase every year" (Capterra, March 31, 2025, more than a year old). Ask which carriers and networks cover your ZIP codes before comparing fees.

Questions for a California PEO

1. Which of your entities is on the IRS CPEO list, and is it the one on our contract?
2. Will our UI, ETT and SDI run under your EDD account or ours?
3. Who pays waiting-time penalties if a final paycheck is late?
4. Is your fee per employee or a percent of payroll?
5. Which medical carriers are available in our counties, and what was last year's renewal increase?
6. What are the notice period and exit fees?

If you mostly need payroll and a benefits broker, compare the PEO and payroll service models first.