California AB5 and Independent Contractors: What HR Must Know

California AB5, also known as the Assembly Bill 5, has fundamentally changed the classification of independent contractors in the state. Effective January 1, 2020, the law codified and expanded the “Dynamex” ABC test, making it significantly harder for companies to use independent contractors rather than employees for California-based work. For HR professionals managing teams that include California workers—whether those workers are on-site or remote—understanding AB5 and its ongoing legal developments is essential to avoiding costly misclassifications, back-pay liability, and civil penalties.

What Is California AB5?

California AB5 is legislation that codifies the California Supreme Court’s 2018 Dynamex decision by embedding the ABC test into the California Labor Code, the Unemployment Insurance Code, and the Industrial Welfare Commission wage orders. Under AB5, a worker is presumed to be an employee unless the hiring entity can demonstrate all three of the following:

• Prong A: The worker is free from the control and direction of the hiring entity in connection with the performance of the work, both under the contract for the performance of the work and in fact.
• Prong B: The work performed by the worker is outside the usual course of the hiring entity’s business. This is arguably the most consequential prong—a company cannot use a worker performing its core business functions as an independent contractor. A ride-share company cannot classify its drivers as contractors; a staffing agency cannot classify placed workers as contractors unless those workers are placed in positions outside the agency’s own business.
• Prong C: The worker is customarily engaged in an independently established trade, occupation, or business of the same nature as the work performed for the hiring entity. This means the worker genuinely operates their own enterprise—they have their own customers, set their own rates, and are not economically dependent on any single hiring company.

All three prongs must be satisfied for a contractor classification to hold under AB5. Failure on any single prong—even if the other two are clearly met—means the worker must be treated as an employee with all associated obligations, including minimum wage, overtime, expense reimbursement, meal and rest breaks, workers’ compensation, and UI contributions.

Implications for HR Teams

AB5 has broad downstream implications for HR operations. For HR professionals, the law requires a comprehensive audit of every independent contractor relationship involving California-connected work. Even remote workers performing services for a California-based company from another state may be subject to California law depending on the nature of the work and where the business effects are felt.

Misclassifying an employee as an independent contractor under AB5 can expose the organization to back wages, unpaid overtime, interest, penalties under the Private Attorneys General Act (PAGA—which allows employees to sue on behalf of themselves and all aggrieved employees), workers’ compensation claims, and tax liability from unpaid payroll taxes. PAGA cases are particularly costly because they aggregate penalties across all affected workers and cannot be waived by private agreement.

Best Practices for AB5 Compliance

Building a defensible AB5 compliance program requires more than reviewing contracts—it means analyzing the actual operational relationships between the company and each contractor. HR teams should:

• Map every independent contractor engagement with a California nexus, including remote workers performing services for California operations
• Apply the three-prong ABC test systematically to each engagement, documenting the analysis and the specific facts that support each prong
• Focus particular attention on Prong B—if the contractor is performing work that is central to your business’s revenue model or operations, reclassification is almost certainly required
• Conduct audits of new contractor engagements before they begin, not after problems arise
• Consult employment counsel for any situation that presents ambiguity, especially in industries like tech, media, delivery, and healthcare that have been heavily scrutinized under AB5
• Update contractor agreements, onboarding documentation, and vendor management processes to reflect the requirements of the law

Exceptions to AB5

The California legislature recognized that the strict ABC test would eliminate legitimate independent contractor relationships in certain established professions, and AB5 includes numerous occupation-specific exemptions. These professions may use a different classification test—generally the prior Borello multifactor test—rather than the ABC test. Exempt professions include, but are not limited to:

• Licensed physicians, surgeons, dentists, podiatrists, psychologists, and veterinarians
• Licensed attorneys, architects, engineers, private investigators, and accountants
• Licensed real estate agents and securities broker-dealers
• Direct sales representatives paid primarily by commission
• Certain entertainment industry workers, subject to specific conditions
• Business-to-business contractors—where a genuine business entity (not just an individual) contracts to provide services to another business, subject to twelve specific conditions

The exemptions are narrow, technical, and subject to ongoing litigation. Before relying on any exemption, HR should verify that the specific conditions required for that exemption are fully satisfied and document that determination with counsel’s input.

How to Handle Misclassification

If an audit reveals that a current or former contractor should have been classified as an employee, prompt and structured action can mitigate the total liability exposure. The response should include:

• Reclassifying the worker prospectively as an employee, effective the date the employer determines employment status applies
• Calculating the back wages, overtime, and expense reimbursements owed, covering the period of misclassification within the applicable statute of limitations (typically three or four years for wage claims in California)
• Adjusting payroll tax filings and benefits enrollment as required
• Notifying the worker of their reclassification and the changes to their compensation and benefits
• Engaging employment counsel to assess PAGA exposure and evaluate whether a proactive remediation or litigation defense strategy is appropriate given the specific facts

Tools to Support AB5 Compliance

Keeping track of AB5 requirements across a dynamic contractor workforce is significantly easier with the right HR technology infrastructure. Treegarden helps HR teams maintain accurate records of workforce classification decisions, track the status of contractor engagements, and build the documentation trail that supports a defensible compliance position. Centralized data visibility across employee and contractor populations makes it easier to identify patterns that may signal classification risk before they escalate to formal disputes.

Whether you’re managing a handful of California-based contractors or a large distributed workforce, staying compliant with AB5 and the full landscape of California labor law requires a systematic approach. Treegarden can help HR teams build the workflows and documentation practices needed to manage classification compliance with confidence at scale.

Frequently Asked Questions

What is the ABC test under California AB5?

The ABC test is a three-part standard used to determine whether a worker should be classified as an employee or independent contractor under California AB5.

Are there exemptions to California AB5?

Yes, certain professions and industries are exempt from AB5. These include doctors, real estate agents, and public accountants.

How can HR ensure compliance with AB5?

HR can ensure compliance by reviewing existing contracts, conducting audits, updating documentation, and using tools like Treegarden to manage data efficiently.

What happens if someone is misclassified under AB5?

Misclassification can lead to back pay, legal penalties, and reputational damage. It's important to reclassify workers and seek legal guidance promptly.

Can independent contractors work in California under AB5?

Yes, but only if they meet all three criteria of the ABC test. Otherwise, they will be considered employees.

AB5's Impact on the Gig Economy and Platform Businesses

California AB5 was significantly shaped by the gig economy debate — particularly the classification practices of app-based platforms like Uber, Lyft, DoorDash, and Instacart, which had historically classified their workers as independent contractors despite the degree of control the platforms exercised over their work. AB5's ABC test directly targeted these arrangements, and the resulting legal, political, and business consequences illustrate the stakes involved when worker classification law changes at scale.

In November 2020, California voters passed Proposition 22, which created a separate classification category for app-based rideshare and delivery drivers — allowing them to remain classified as independent contractors while providing certain guaranteed earnings floors and benefits that traditional independent contractor classification does not require. Prop 22 was the most expensive ballot initiative in California history, with the gig economy platforms collectively spending over $200 million to pass it. It was subsequently challenged in court, with lower courts ruling it unconstitutional before the California Supreme Court reversed that ruling in 2024, confirming Prop 22's validity.

The significance of the Prop 22 battle for other businesses is the illustration that worker classification law is actively contested political and legal terrain — not a settled compliance question with clear permanent answers. Businesses that have built their operating model on contractor classification should expect continued legislative and regulatory pressure, particularly at the state level, and should build workforce strategy resilience that doesn't depend on permanent contractor classification remaining legally available for any specific category of worker.

Beyond the gig economy, AB5 created immediate compliance challenges for industries with longstanding contractor-heavy operating models: trucking (which secured a federal preemption ruling protecting certain owner-operators), entertainment (which obtained a raft of specific occupational exemptions), and professional services (where the business-to-business exemption provides partial protection for genuinely independent professional firms). Understanding which exemption applies — and whether it fully applies to your specific engagement structure — requires industry-specific legal analysis that generic AB5 compliance guides cannot substitute for.

Auditing Your Contractor Relationships for AB5 Compliance

Any California employer that uses independent contractors should conduct a systematic audit of those relationships against the ABC test criteria, and should do so on a regular basis rather than as a one-time compliance exercise. Contractor relationships evolve over time — the nature and degree of control can shift, exclusivity can develop informally, and work can drift outside the contractor's usual business scope — and a relationship that passed the ABC test two years ago may not pass today.

A structured audit process works from the contractor roster outward. Start by listing every worker classified as an independent contractor who performs services in California. For each, document their engagement terms, the nature of their work, how their work is supervised and directed, whether they work exclusively for your company or have other clients, and whether their services are in a separately established independent trade or business. This documentation exercise frequently reveals contractor relationships that have informally evolved into employment relationships in substance if not in form.

The most commonly failed ABC test element is Prong B — that the work performed is outside the usual course of the hiring entity's business. This test has broad implications: a marketing agency that uses a freelance copywriter to write website copy is at risk, because copywriting is presumably within the normal course of a marketing agency's business. A manufacturing firm that uses a freelance HR consultant for a specific project is likely safer, because HR consulting is not within the usual course of a manufacturing business. The analysis is fact-specific and industry-specific, and legal counsel's input is valuable for borderline cases.

When the audit identifies contractor relationships that do not meet the ABC test, the remediation options are: convert the worker to employee status, restructure the engagement to meet the test requirements, invoke a specific exemption if one applies, or terminate the engagement. Conversion to employment requires payroll tax registration, benefits offerings that comply with California employment law, and — if the worker is part of a professional services arrangement — potentially restructuring the commercial relationship entirely. The cost and complexity of conversion is real, but it is substantially less than the cost of misclassification penalties, back wages, and litigation if the relationship is challenged by the worker or the LWDA.