The question comes up every time a business grows: this person works for us regularly, do they need to be on payroll? Owners often reach for the contractor agreement, on the theory that a signed document settles the matter.
It does not. Worker classification is determined by the substance of the relationship, not by what the parties call it. A contract describing someone as an independent contractor is evidence, but it carries little weight against facts pointing the other way.
The three categories
The IRS groups the common-law factors into three categories. No single factor decides; the whole relationship is weighed.
Behavioral control — does the business have the right to direct how the work is done? Note that it is the right to control that matters, not whether you exercise it. Setting hours, requiring specific methods, providing detailed instructions, and training someone in your procedures all point toward employment. Evaluating only the finished result points the other way.
Financial control — does the worker have a real opportunity for profit or loss? Contractors typically have unreimbursed expenses, a significant investment in their own tools, services available to the broader market, and payment by the job. An hourly rate with expenses reimbursed looks like employment.
Type of relationship — written contracts, benefits, permanence, and whether the work is a core part of the business. Someone performing your central service, indefinitely, is hard to characterize as an outside vendor. Publication 15-A works through these with examples by industry.
The twenty-factor list is gone, mostly
Practitioners still refer to “the twenty-factor test” from Revenue Ruling 87-41. The IRS has folded those factors into the three categories above, and it is more useful to think in terms of the categories. The old list survives as a checklist, but it invites a scoring mentality — counting factors — that misses how the analysis actually works. Some facts are simply weightier than others.
Where owners get into trouble
A few patterns recur.
The former employee who “went contractor.” Same desk, same duties, same hours, new paperwork. This is the fastest way to lose a classification argument, because nothing about the relationship changed except the label.
The long-term full-timer. A contractor working exclusively for you, forty hours a week, for three years, with no other clients, is functionally an employee regardless of intent.
Requiring the worker to form an LLC. Making someone set up an entity does not change the analysis. The factors still apply to the underlying relationship.
Paying by the hour and reimbursing everything. Removing the worker’s opportunity for profit or loss removes one of the strongest indicators of contractor status.
What it costs to be wrong
Reclassification is retroactive. The employer becomes liable for the employee’s share of FICA it failed to withhold, its own matching share, federal and state unemployment tax, and penalties and interest running from the original due dates. Where the failure is not treated as intentional, reduced rates under IRC §3509 can apply — but that relief is unavailable if no Forms 1099 were filed.
The tax exposure is often not the largest piece. The Department of Labor applies its own test under the Fair Labor Standards Act, and a worker reclassified as an employee may be owed overtime and minimum wage retroactively. State agencies run separate determinations for unemployment insurance and workers’ compensation, frequently on stricter standards than the federal test — several states apply an “ABC test” that presumes employment unless all three prongs are met. Benefit plans add another layer, since a reclassified worker may have been improperly excluded from a retirement plan.
A single worker can therefore trigger findings from four different authorities, each with its own standard and its own clock.
If you are uncertain
Two formal routes exist.
Form SS-8 asks the IRS to make a determination on a specific worker. It is free, but it is not fast — expect a long wait — and either party can file it. A worker who files one puts the question in front of the IRS whether or not you were ready.
The Voluntary Classification Settlement Program lets eligible employers reclassify workers prospectively while paying a substantially reduced amount for the past. Eligibility requires having filed all required Forms 1099 for the prior three years and not currently being under audit for classification.
The practical standard
Before you engage someone as a contractor, ask whether they could plausibly be doing the same work for three other businesses this month. If the answer is no — because you set their schedule, supply their tools, direct their methods, and occupy their working week — then you have an employee, and the cheaper conversation is the one you have now rather than after a state audit.
For a sense of what the payroll cost actually looks like once someone is on the books, our true cost of an employee calculator works through the employer taxes, insurance, and overhead that ride along with a hire.