Employee vs contractor — what's the misclassification risk?

Misclassification happens when you pay someone as an independent contractor but they are, in practice, working like an employee. Tax authorities and employment tribunals look at the economic reality of the relationship, not just what the contract says. If someone works set hours, uses your equipment, takes direction from you day-to-day, and has no other clients, they likely qualify as an employee regardless of what the contract calls them. The consequences range from back payment of employer taxes and pension contributions to employment rights claims for unfair dismissal, holiday pay, and sick pay.

The IRS uses a 20-factor test looking at behavioural control (do you direct how they work?), financial control (do you control payment method, expenses, and profit opportunity?), and relationship type (are there written contracts, benefits, permanent relationships?). California uses the stricter ABC test — workers are presumed employees unless the business can prove all three: the worker is free from control, does work outside the company's usual business, and is engaged in an independently established trade. High-risk indicators: exclusive arrangement, set hours, company equipment, long duration, no right to subcontract.

IR35 is UK legislation targeting contractors who work through their own limited company but would otherwise be an employee. Since April 2021, medium and large companies must determine whether each contractor engagement is "inside" or "outside" IR35 using HMRC's Check Employment Status for Tax (CEST) tool. Inside IR35 means the contractor is taxed like an employee and the company pays employer National Insurance on their fees. Key risk factors: substitution clause (can they send someone else?), control over how the work is done, integration into the company (team meetings, company email, same projects as employees).

Tax authorities can reassess unpaid employer taxes, National Insurance, or FICA contributions going back several years, plus interest and penalties. In the US, the IRS can impose a trust fund recovery penalty on business owners personally. Employment tribunals can order payment of backdated holiday pay, sick pay, and pension contributions. In extreme cases, repeated misclassification can trigger criminal charges for payroll tax fraud. Proactive audits of your contractor arrangements — especially long-term exclusive ones — are far cheaper than reactive remediation.

Yes, but only if the contract reflects the actual working arrangement. A clause saying the contractor can substitute someone else helps — but only if substitution is genuinely permitted in practice. Specifying that the contractor uses their own equipment, sets their own hours, and works for multiple clients reduces risk on paper, but if the day-to-day reality is different, authorities will look through the contract to the facts. Contracts are a useful starting point but are not a substitute for a genuinely independent working relationship.