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The Common Law Test is the IRS worker-classification test, also known as the right-to-control test, used to determine whether a worker is an employee or an independent contractor for federal tax purposes. It examines three broad categories of evidence: behavioral control (whether the company directs how the work is done), financial control (whether the worker invests in their own tools, serves other clients, and can realize a profit or loss), and the type of relationship (written contracts, employee-style benefits, permanency, and whether the work is a core business activity). No single factor is decisive; instead, the IRS weighs the overall picture of the working arrangement. Because it evaluates the totality of circumstances rather than requiring every condition to be met, the Common Law Test is generally more flexible than the stricter state-level ABC Test.
The IRS applies the Common Law Test by looking at the full working relationship rather than any single checkbox. Historically framed as "20 factors," the analysis today is organized into three categories of evidence. The central question in every category is the same: how much right does the business have to control the worker and the work?
Because no single factor is decisive, a worker can score toward "contractor" on some factors and "employee" on others. The IRS weighs the overall picture to reach a conclusion, which makes documentation and consistency across the relationship critically important.
The Common Law Test is the federal, tax-focused standard, while many states apply the stricter ABC Test for wage, unemployment, and labor-law purposes. The two can reach different conclusions on the same worker, so businesses often must satisfy both.
| Feature | Common Law Test | ABC Test |
|---|---|---|
| Primary use | Federal tax classification (IRS) | State wage & labor laws |
| Approach | Weighs the total picture | Must pass all three prongs (A, B, C) |
| Flexibility | More flexible, fact-specific | Stricter, harder to qualify as contractor |
| Decisive factor | None; overall control matters | Failing any single prong = employee |
The result is that a worker who passes the Common Law Test as an independent contractor at the federal level may still be classified as a W-2 employee under a state's ABC Test.
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Book a Demo Getting the Common Law Test wrong is one of the most common and costly compliance failures for companies using contingent talent. Worker misclassification can trigger back taxes, unpaid overtime and benefits, penalties, and interest from the IRS and state agencies.
Common triggers for reclassification
Because the test is judgment-based, enterprises benefit from consistent processes, clear contracts, and a partner who assesses classification before every engagement rather than after an audit.
WorkGenius removes classification guesswork from your contingent workforce program. As a full Employer of Record across all 50 US states and 100+ countries, WorkGenius assesses worker classification before every engagement, applying the right standard for both federal and state rules so your talent is engaged correctly from day one.
By combining AI matching with expert human recruiters, WorkGenius gives enterprises one platform to source, classify, onboard, manage, and pay contingent talent. When a worker should be an employee, WorkGenius can carry that employment relationship and absorb the compliance burden; when a genuine contractor relationship is appropriate, it is properly documented and defensible. That means faster access to talent with far less workforce compliance exposure.
The IRS Common Law Test weighs three categories of evidence: behavioral control (whether the company controls how the work is done), financial control (whether the worker invests in their own tools, has other clients, and can realize a profit or loss), and the type of relationship (written contracts, benefits, permanency, and whether the work is a core business activity). No single factor decides the outcome.
No. The Common Law Test is the IRS federal tax standard and weighs the overall picture of control, making it more flexible. The ABC Test is used by many states and requires a worker to pass all three prongs to be a contractor, making it stricter. A worker can pass one test but not the other.
The IRS uses the Common Law Test to determine employee versus independent contractor status for federal tax purposes, including income tax withholding, Social Security, Medicare, and unemployment tax obligations. Businesses use it to classify workers correctly before engagement.
Misclassification can lead to significant liability, including back taxes, unpaid overtime and benefits, penalties, and interest from the IRS and state agencies. Because the test is judgment-based, consistent documentation and a proactive classification review are the best protection.
WorkGenius assesses worker classification before every engagement and acts as an Employer of Record across all 50 US states and 100+ countries. It applies the correct standard for federal and state rules and can carry the employment relationship when a worker should be a W-2 employee, reducing compliance exposure.
Explore more concepts in our workforce glossary
A strict, three-part worker-classification test that presumes a worker is an employee unless all three ABC prongs are met.
Learn moreThe error of treating someone who legally qualifies as an employee as an independent contractor — exposing companies to back taxes, penalties, and retroactive benefits liability.
Learn moreA self-employed worker who provides services under contract, is paid via Form 1099, controls how the work is done, and handles their own taxes.
Learn moreA third-party organization that legally employs workers on your behalf, handling all payroll, taxes, benefits, and compliance while you direct the work.
Learn moreWorkGenius combines AI-powered talent matching with enterprise-grade compliance. Source, onboard, manage, and pay freelancers globally — all from one platform.
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