If you hire independent contractors in the US, misclassification risk is the risk that a worker you treat as an independent contractor is legally an employee — and it is real because more than one test can apply to the same person. For federal tax, the IRS applies its common-law test; for federal wage-and-hour law under the FLSA, the Department of Labor applies an economic-reality test that is being changed in 2026 (the 2024 rule still applies until any change is final); and some states, such as California, use a stricter ABC test. Because those bodies can reach different answers for the same worker, the safe way to engage is to apply the correct test for the law in question, keep the arrangement a genuine business-to-business one — the contractor controls how the work is done, carries their own risk, works to defined deliverables — and record it in a written contract for services. One guardrail: the UK's IR35 does not apply to US engagements.
This is general information about US worker-classification principles for businesses that engage contractors, not legal, tax or financial advice. US rules vary by state and are changing — the federal wage-and-hour standard is under review in 2026 — and any worker's status depends on the actual arrangement. Take professional advice before acting on your situation.
What is worker misclassification, and why does it matter to the business that hires?
Worker misclassification means treating a worker who is legally an employee as an independent contractor. For the business doing the hiring, it matters because getting it wrong is not a paperwork slip — it changes what you owe and who can come asking. If a worker you have engaged on a Form 1099-NEC should have been on a Form W-2, you can face exposure to back pay and unpaid overtime, unpaid employment taxes, and employee benefits the person should have received, alongside potential penalties. The precise consequences depend on the law and the facts, so treat them as real but situation-specific rather than a fixed number.
The part that catches businesses out is that more than one agency can act, and they do not have to agree. The IRS looks at the tax question; the Department of Labor looks at wage-and-hour obligations under the FLSA; a state labour agency may apply its own test entirely. A single engagement can therefore be examined from several directions at once, which is why "we always use 1099s" is not, by itself, a defence. Classification follows the real working relationship, not the label on the contract or the form you file. That multiplicity — one worker, several possible answers — is the core of the risk.
Which test decides if a US worker is a contractor or an employee?
There is no single US test, and that is the crux of the problem for a hirer: which test decides depends on which law is asking. Three matter most in practice, and they are applied by different bodies for different purposes, so the same worker can be a contractor under one and an employee under another. The table sets them out.
| Test | What it governs | Who applies it |
|---|---|---|
| IRS common-law test | Federal tax (withholding, employment taxes; 1099-NEC vs W-2) | The IRS — weighs behavioural control, financial control and type of relationship; no set number of factors |
| DOL economic-reality test (FLSA) | Federal wage-and-hour (minimum wage, overtime) — being changed in 2026; the 2024 rule still applies until any change is final | The Department of Labor — totality of the circumstances, no single factor decisive |
| State ABC test (e.g. California) | State wage/employment purposes under state law | The state (California, from AB5, effective 1 Jan 2020) — employee unless the hirer proves all three prongs |
A few things a hiring team should hold onto. The IRS common-law test weighs behavioural control, financial control and the type of relationship, and in the agency's own words there is "no 'magic' or set number of factors" — you weigh the whole relationship together (IRS guidance). The DOL economic-reality test under the FLSA asks whether the worker is genuinely in business for themselves or economically dependent on you, with no single factor decisive. And the ABC test used by states such as California, Massachusetts and New Jersey is the strictest of the three: a worker is presumed an employee unless the hiring entity proves all three prongs — (A) the worker is free from the hirer's control and direction in performing the work; (B) the work is outside the usual course of the hirer's business; and (C) the worker is customarily engaged in an independently established trade, occupation or business (California DIR). Prong (B) is the one that catches hirers out: even a genuinely independent specialist can be reclassified if their work sits squarely inside what your business normally does.
One of those three is mid-change, and a hirer needs the dates. The DOL's 2024 final rule (effective 11 March 2024) sets the current multifactor economic-reality test and remains the operative federal wage-and-hour standard. On 26 February 2026 the DOL published a Notice of Proposed Rulemaking proposing to rescind the 2024 rule and adopt a streamlined five-factor economic-realities test that would give greater weight to two "core" factors — the nature and degree of control and the worker's opportunity for profit or loss. The comment period closed on 28 April 2026, but the change is not yet finalised: until any rescission is final, the 2024 rule still applies (DOL 2026 rulemaking). This is general information, not advice — confirm which version governs your engagement with a professional.
If your procurement or hiring team wants the verified-supplier standards and cleaner contracting frameworks that sit behind a lower-risk engagement, the For-Clients side sets out how the IFA works with businesses.
How do you engage an independent contractor the right way?
Engaging a contractor the right way is mostly about making the arrangement genuinely what the label says it is — because every test above follows the real relationship, not the paperwork. Start by identifying which law and which state apply to the engagement, and apply the correct test to it. If you are genuinely unsure of a worker's status for tax, a business can file Form SS-8 and ask the IRS for a determination (IRS Form SS-8).
Then make sure the working reality holds up. In a real business-to-business engagement the contractor controls how the work is done, carries their own commercial risk — their own tools, their own expenses, a genuine chance of profit or loss — and works to defined deliverables rather than filling an open-ended role inside your team. Put that in a written contract for services, but understand what a contract can and cannot do: it helps by recording the intended arrangement, and it does not override the real relationship if day-to-day practice looks like employment. If you want a checklist of what belongs in one, our guide on what to include in a freelance/independent contractor agreement covers the clauses that matter.
There is also a supplier-selection lever. Engaging contractors who operate as genuine, verified businesses — with their own clients, their own infrastructure, and the ability to provide continuity or a substitute — lowers your operational and classification risk, though it does not legally eliminate it. This is the honest core of the IFA's For-Clients proposition. The IFA is a new (2026) self-regulatory trade body, not a regulator or an accreditor: its verified-supplier standards and continuity/substitution support are frameworks and access, designed to reduce the operational and classification risk of engaging one-person firms. To be clear, those standards do not legally determine any worker's status — that always depends on the real arrangement and the applicable test — so IFA involvement never makes a worker "un-misclassifiable" or fixes a classification. What it does is make it easier to engage independents who genuinely operate as businesses. For where a trade body sits alongside unions and marketplaces, see trade body vs union: who represents independent professionals.
If you engage independents regularly, it also helps to point good contractors towards operating to a recognisable standard; the membership tiers set out what that involves.
What about IR35 — does that apply?
If you have read about IR35, off-payroll working or HMRC's CEST tool and wondered whether they bear on your US hiring, the short answer is no. Those are UK rules, and they have no application to US engagements — US classification is decided by the IRS common-law test, the DOL economic-reality test and state law such as California's ABC test, never by IR35. We mention IR35 here only to draw the line clearly, because the two systems are easy to confuse.
The one time it becomes relevant is if you engage contractors in the UK. Then a different regime applies — off-payroll/IR35, assessed with CEST and UK case-law factors such as control, the right of substitution and mutuality of obligation — and you would look at that separately, under UK law, not the US tests above. For the US classification question from the worker's side, our explainer on independent contractor vs employee in the US is the companion to this hirer guide, and the IFA's standards and certification page sets out what "verified independent supplier" means in practice.
Frequently asked questions
What is worker misclassification? Worker misclassification is treating a worker who is legally an employee as an independent contractor. In the US it exposes the hiring business to back pay and unpaid overtime, unpaid employment taxes, benefits the worker should have received, and potential penalties — and more than one agency (the IRS, the DOL, a state labour agency) can examine the same engagement. This is general information, not advice; take professional advice on your situation.
How do you legally hire an independent contractor in the US? Apply the correct test for the law and state that govern the engagement, and make sure the arrangement is genuinely business-to-business: the contractor controls how the work is done, carries their own commercial risk, and works to defined deliverables, recorded in a written contract for services that reflects the real relationship. If you are unsure of a worker's tax status, you can file Form SS-8 for an IRS determination. Engaging contractors who operate as genuine, verified businesses lowers your risk but does not legally eliminate it. Take professional advice on your situation.
What is the ABC test? The ABC test is a stricter state-law standard used in states such as California, Massachusetts and New Jersey. In California (from the Dynamex decision in 2018, codified by AB5 and effective 1 January 2020) a worker is an employee unless the hiring entity proves all three: (A) the worker is free from the hirer's control and direction in performing the work; (B) the work is outside the usual course of the hirer's business; and (C) the worker is customarily engaged in an independently established trade, occupation or business.
What is the new independent contractor rule? At the federal wage-and-hour level the standard is being changed. The DOL's 2024 final rule (effective 11 March 2024) sets the current economic-reality test and remains operative. On 26 February 2026 the DOL published a proposal to rescind it and adopt a streamlined five-factor economic-realities test giving greater weight to two core factors — the nature and degree of control, and the worker's opportunity for profit or loss. The comment period closed on 28 April 2026, but the change is not yet finalised, so the 2024 rule still applies until any rescission is final. Take professional advice on which version governs your engagement.
Does IR35 apply in the US? No. IR35 (off-payroll working), assessed with HMRC's CEST tool, is a UK regime and has no application to US engagements. US worker classification is decided by the IRS common-law test (tax), the DOL economic-reality test (wages, being changed in 2026), and state law such as California's ABC test. IR35 only becomes relevant if you engage contractors in the UK, under UK law.
The honest bottom line
For a hiring business, US worker classification is several separate tests, not one, and one of them is mid-change in 2026. You reduce your exposure by applying the right test for the applicable law and state, engaging contractors who genuinely operate as businesses, and putting a real arrangement into a written contract for services — not by relying on the 1099 label or on anyone's membership badge. A lower-risk engagement is a matter of substance, and then of taking professional advice on the specifics. That is the ground the IFA's For-Clients standards are built on — honestly, and within their limits: they reduce operational and classification risk, but they do not determine any worker's legal status.
If you want to see how the IFA works with businesses that engage independent professionals — verified-supplier standards, continuity and substitution, cleaner contracting — start on the For-Clients side.