The Rule of Four and What Really Counts as an Employee
South Carolina has one of the clearest workers' comp requirements of any state — but it is also one that many small business owners misunderstand. The Rule of Four determines whether your business is legally required to carry coverage. This video explains exactly how to count employees, who counts, who does not, and what is at stake if you get it wrong.
Under SC Code 42-1-360, any South Carolina employer with four or more employees — full-time or part-time — is required to carry workers' compensation insurance. This is the Rule of Four. The count includes all employees, not just full-time ones. A restaurant with two full-time cooks and two part-time servers has four employees and is required to carry coverage. The count is assessed on any given week — if you ever have four or more employees working simultaneously, the requirement applies. Sole proprietors, partners, and corporate officers can sometimes elect to exclude themselves from the count, but this requires formal documentation. The safest approach is to assume you need coverage if you have any employees, and consult with a specialist if you are near the threshold.
South Carolina uses a broad definition of employee for workers' comp purposes. Full-time and part-time workers both count. Temporary workers placed by a staffing agency are typically covered under the agency's policy, not yours. True independent contractors — with their own business, tools, and the ability to work for multiple clients — generally do not count. However, South Carolina courts have found many workers who claim to be independent contractors are actually employees under the WC statute. Family members who work in the business generally count as employees unless they are excluded. When in doubt, the SC Workers' Compensation Commission provides guidance on classification disputes.
Operating without required workers' compensation coverage in South Carolina carries serious consequences. The SC Workers' Compensation Commission can issue stop-work orders, shutting down your operations until coverage is obtained. Employers found to be illegally uninsured can be held personally liable for the full cost of any employee injuries, with no limits on damages. In addition to regulatory penalties, uninsured employers lose the standard defenses available in workers' comp claims, meaning injured employees may pursue full tort damages in civil court rather than the limited benefits of the WC system. For a small business, a single serious injury without coverage can be financially catastrophic — easily exceeding $500,000 in total costs.
Yes, if you have four or more part-time employees in a given week, you are required to carry workers' comp coverage. Part-time status does not exempt workers from the count. A business with ten part-time workers is just as required to carry coverage as one with ten full-time employees.
A sole proprietor with no employees is not legally required to carry workers' comp. However, many sole proprietors purchase coverage voluntarily to protect themselves in case of injury, since health insurance often excludes work-related injuries. Sole proprietors who work as subcontractors may also need a policy to satisfy general contractor requirements.
If you are an employer without required coverage and an employee is injured, you are personally liable for all medical costs, lost wages, and disability benefits that workers' comp would have provided — with no limits. The SC WCC can also issue a stop-work order shutting your business down until coverage is in place.
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