What states does TriNet serve?

TriNet provides PEO services in all 50 states across the United States.

Is TriNet IRS CPEO certified?

Yes, TriNet is an IRS Certified Professional Employer Organization (CPEO). This certification means they have met strict financial, reporting, and background requirements set by the IRS, providing additional tax advantages and liability protections for client companies.

What size companies does TriNet work with?

TriNet typically serves businesses with 5 to 500 employees. If your company is outside this range, contact them directly to discuss your options.

What services does TriNet provide?

TriNet offers the following HR and employer services: Payroll Processing, Employee Benefits, HR Management, Compliance Support, Risk Mitigation.

How do I get a quote from TriNet?

You can request a no-obligation quote from TriNet by filling out the form on this page. A PEO specialist will review your business details and connect you within one business day.

TriNet

✦ VERIFIEDIRS CPEO CertifiedNational PEO

Dublin, CA·Founded 1988·Serving 5-500 employees

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All 50

States Served

Services

Industries

5-500

Serving

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About TriNet

TriNet is a publicly traded (NYSE: TNET) Professional Employer Organization founded in 1988 by Martin Babinec in San Leandro, California, and headquartered in Dublin, California. With $5.01 billion in annual revenue (2025) and approximately 335,000 worksite employees as of Q3 2025, TriNet is one of the three largest PEOs in the United States. The company processes roughly $73 billion in payroll annually and has maintained continuous ESAC accreditation since 1995. A TriNet subsidiary holds IRS CPEO certification. TriNet's defining characteristic is its industry-specific service model — rather than offering generic HR support, TriNet organizes its teams around verticals including technology, nonprofits, financial services, life sciences, and professional services. Each vertical has dedicated HR advisors, compliance specialists, and benefits packages tailored to that sector. TriNet partners with businesses ranging from 3 to 2,500 employees, with its sweet spot in professional services and knowledge-worker companies in the 10-500 employee range. The platform includes a cloud-based HR portal with employee self-service, benefits enrollment, expense management, recruiting, and workforce analytics.

IRS Certification

IRS Certified PEO (CPEO)

Certification active · Verified by PEO Authority

Certified ✓

The IRS Certified PEO (CPEO) designation is awarded by the Internal Revenue Service to PEO companies that meet rigorous standards for financial health, tax compliance, and operational integrity. TriNet holds CPEO status — a distinction held by fewer than 15% of PEOs in the United States.

Federal Tax Liability

As a CPEO, TriNet assumes sole liability for federal employment taxes on wages paid — protecting your business from tax exposure.

Annual Financial Audits

CPEOs undergo independent CPA audits annually and must maintain a surety bond, ensuring fiscal accountability and solvency.

IRS Reporting

TriNet files employment taxes under their own EIN as CPEO, simplifying your year-end tax obligations and eliminating duplicate filings.

Why businesses choose TriNet

✓Industry-specific verticals — dedicated HR teams for tech, nonprofits, financial services, and life sciences

✓37 years of continuous operation with ESAC accreditation since 1995 and IRS CPEO certification

✓$5.01B revenue and ~335,000 worksite employees as of 2025 — genuine enterprise-scale buying power

✓Processes approximately $73 billion in payroll annually

✓Cloud-based platform with employee self-service, benefits enrollment, expense management, and analytics

✓Strong compliance infrastructure for multi-state and complex regulatory environments

✓Serves companies from 3 to 2,500 employees across professional and knowledge-worker industries

Company Details

Headquarters

Dublin, CA

Founded

1988

Serving

5-500 employees

CPEO Certified

Yes - IRS Verified

Coverage

Nationwide

Company Type

National PEO

TriNet in Your State

Browse PEO options and compare providers in each state where TriNet operates.

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Pros & Cons

Pros

✓

Industry-specific expertise

Dedicated vertical teams for tech, finance, nonprofits, life sciences, and professional services.

✓

Enterprise track record

Founded 1988, ESAC accredited since 1995, publicly traded — one of the most established PEOs around.

✓

Comprehensive platform

Full HR suite including self-service portal, expense management, recruiting, and workforce analytics.

✓

Benefits breadth

Access to Fortune 500-caliber health plans from major national carriers.

✓

Scale and buying power

335,000+ worksite employees translates to significant leverage on benefits pricing.

−

Cons

−

No transparent pricing

All contracts are custom-quoted — expect a full sales process before seeing any numbers.

−

Mixed support reviews

Smaller clients sometimes report difficulty reaching the right contact or getting timely resolution.

−

Contract terms

Typically requires annual agreements with auto-renewal and early termination fees.

PEO Authority Editorial Note

TriNet is the right choice when industry expertise matters more than software simplicity. If you run a SaaS company, a nonprofit, or a financial services firm, TriNet's vertical specialization means you work with HR advisors who understand your world. The tradeoff is price transparency — TriNet does not publish rates and is positioned at a premium. Best for: professional services, technology, nonprofit, and financial services companies that need industry-specific HR expertise and comprehensive compliance support.

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