ABC test

ABC test is the three-prong statutory contractor classification test that puts the burden of proof on the engager for all three prongs at once.

For global payroll and contractor teams hiring US workers, the ABC test is the stricter alternative to the IRS common-law test, applied at the state level in California, Massachusetts, New Jersey, Illinois, Connecticut, and Indiana.

The rule started in Massachusetts in 1990 and entered California in the 2018 Dynamex decision (4 Cal.5th 903), codified by AB5 effective 1 January 2020 in Labor Code § 2775. Roughly thirty US states apply some form of ABC test for unemployment-insurance classification.

The three prongs are: (A) freedom from control and direction in performing the work, (B) work outside the usual course of the engager's business, and (C) customary engagement in an independently established trade. A single failed prong reclassifies the worker as a W-2 employee.

What does the ABC test mean in payroll?

In payroll, the ABC test is the verdict layer that overrides the contract label and the federal classification result. Three operational features matter for the buyer.

The burden-of-proof inversion

The ABC test flips the contractor-classification default. Once a wage claim or unemployment claim is filed, the engager has to prove all three prongs with documentary evidence.

Contracts, scope-of-work statements, the worker's other client history, business registration, separate tools, and insurance all sit in the evidence stack. Failing to produce that evidence loses the case.

The all-three-prongs rule

Pre-Dynamex California ran the Borello multi-factor common-law test, which weighed factors against each other. The ABC test stops weighing. All three prongs must pass simultaneously.

A worker who clears Prongs A and C but fails Prong B reclassifies as an employee. The classification verdict is binary, not a weighted average. See the common-law test entry for the older multi-factor framework.

The state-versus-federal split

The ABC test runs at the state level. The IRS common-law test and the DOL economic-reality test under the 2024 Final Rule (89 FR 1638) run at the federal level on different criteria.

A contractor who clears the IRS test can still trigger California or Massachusetts employee status. The state determination travels separately into the wage, unemployment, and workers' compensation systems.

How do the three prongs decide classification?

Each prong sits in case law, not policy memo language. Each prong has its own failure signature, and any one failure is enough to reclassify.

Prong B catches most growth-stage companies. A software company engaging a freelance graphic designer for marketing collateral clears Prong B. The same software company engaging a freelance engineer to ship product features does not.

Prong C looks at the worker's business profile, not the engagement at hand. A contractor with their own LLC, multiple clients, their own website, their own tools, and their own insurance clears Prong C. A contractor who works only for one engager, lacks any second client, and uses the engager's laptop does not.

California Labor Code § 2778 lists more than 100 occupation exemptions where the Borello common-law test still controls instead of the ABC test. The exemptions cover specific creative, professional, and B2B categories. See the contractor vs employee entry for the broader classification framing across all US worker types.

Which US states run the ABC test, and where does it apply?

Roughly thirty US states apply some form of ABC test for unemployment-insurance classification. Only six apply the strict three-prong version for the full wage-and-hour bundle.

The state-by-state coverage shifts every legislative cycle. A worker who clears California's exemption list in 2024 may not in 2026 if the legislature narrows the carve-out. The classification verdict has to be re-run quarterly against the live statute, not at onboarding only.

ABC-test states attach to where the work is performed, not where the contractor's LLC is registered. A contractor with a Texas LLC working remotely from California performs the work in California and triggers California's ABC test. See the United States country guide for the federal payroll layer that sits underneath the state tests.

What do buyers consistently get wrong on the ABC test?

The recurring mistakes cluster into four moves visible across audit-defence files in ABC-test states.

The first is treating the contract label as controlling. The ABC test runs on the lived working relationship, not the signed paper. A signed independent-contractor agreement is irrelevant if the Labor Commissioner finds the engager directs the work, the work falls inside the usual course of business, or the worker has zero additional clients.

The second is assuming the burden of proof sits with the worker. It does not. The engager has to prove all three prongs once any claim is filed. Failing to produce the evidence loses the case, regardless of how strong the operational facts look.

The third is assuming the ABC test is advisory. California Labor Code § 226.8 lets the Labor Commissioner assess civil penalties up to $25,000 per wilful misclassification, plus unpaid wages, unpaid overtime, unpaid meal- and rest-break premiums, and unemployment-insurance back-contributions across the audit window.

The fourth is running US-style classification globally. The ABC test is a US construction. Using it overseas misses the Scheinselbständigkeit doctrine in Germany, IR35 in the UK, the rebuttable presumption under EU Platform Work Directive 2024/2831, and the Borello-style multi-factor tests that still apply in most other US states. See the misclassification audit entry for the full procedural framework.

What does a contractor-management or EOR provider handle on the ABC test?

Contractor management platforms document the Prong A and Prong C evidence and run the classification questionnaire. EOR providers handle the conversion to W-2 when any prong fails. Neither indemnifies the engager retroactively for prior misclassification.

Contractor-management platforms create the documentary trail for Prongs A and C. They do not fix a Prong B problem. Only redesigning the role to sit outside the engager's core product or service does. See the contractor management entry for the documentation stack.

The EOR conversion places the worker on the provider's US W-2 payroll across covered states. The conversion is prospective. Back-tax, unemployment-insurance back-assessment, and wage-and-hour exposure stay with the engager for the IRS three-year window and the relevant state audit window.

ABC test FAQs

Which US states use the ABC test for contractor classification?

Six states apply the strict three-prong ABC test for the full wage-and-hour bundle: California, Massachusetts, New Jersey, Illinois (construction-focused), Connecticut, and Indiana. Roughly thirty states apply some form of ABC test for unemployment-insurance classification only.

The state-by-state coverage shifts every legislative cycle. ABC-state coverage attaches to where the work is performed, not where the contractor LLC is registered.

Does a signed contractor agreement satisfy the ABC test?

No. The ABC test runs on the lived working relationship, not the signed paper. A signed independent-contractor agreement is irrelevant if the Labor Commissioner finds the engager directs the work, the work falls inside the usual course of business, or the worker has zero additional clients.

The contract matters at the margin as documentary evidence, never as the controlling factor. The burden of proof sits with the engager for all three prongs simultaneously.

What is Prong B and why does it catch most companies?

Prong B requires the contractor's work to fall outside the usual course of the engager's business. A software company engaging a freelance graphic designer for marketing collateral clears Prong B because design is adjacent to the company's product.

The same software company engaging a freelance engineer to ship product features does not clear Prong B because the engineer is building what the company sells. Prong B catches growth-stage companies that staff core product roles on 1099 to keep burn low.

What does ABC-test misclassification cost in California?

California Labor Code § 226.8 lets the Labor Commissioner assess civil penalties up to $25,000 per wilful misclassification, plus unpaid wages, unpaid overtime, unpaid meal- and rest-break premiums under Labor Code § 226.7, paid sick leave, and unemployment-insurance back-contributions.

Federal IRC § 3509 federal tax exposure layers on top. A $150,000 contractor misclassified for three years typically lands at $100,000+ all-in, with class-action exposure compounding across a contractor cohort. See the W-2 vs 1099 entry for the federal tax stack.

Can the ABC test be cured by a contractor-management platform?

Platforms document the Prong A control evidence and the Prong C independent-business evidence. They do not fix a Prong B problem. Only redesigning the role to sit outside the engager's core product or service does.

When any prong fails, the clean answer is W-2 conversion through the engager's own payroll or through an EOR with coverage in the ABC state. The conversion is prospective; prior misclassification liability stays with the engager for the IRS three-year audit window.