Contractor or employee? The misclassification risk Ontario businesses underestimate

Calling a worker a contractor does not make them one. In Ontario, three separate regimes can reclassify the relationship after the fact, each with its own back-charges: the CRA for CPP and EI, the Ministry of Labour for Employment Standards Act entitlements, and the WSIB for premiums and claim costs. A business that has run six "contractors" for three years can face a six-figure assessment without having done anything it believed was wrong. Below is how each regulator decides, where it bites hardest, how to build a contractor relationship that survives a review, and when the honest answer is to move the person onto payroll.

How the CRA decides: the working relationship, not the contract

The CRA applies the common-law test described in its guide RC4110. It starts with what the parties intended, then asks whether the facts match that intention across four factors: control over how, when and where the work is done; ownership of tools and equipment; the chance of profit and risk of loss; and whether the worker can subcontract or hire helpers. Integration into the business, exclusivity and the length of the relationship colour all four. No single factor decides, and a signed agreement declaring independent contractor status is respected only when the day-to-day reality supports it. Either party, or the CRA on its own initiative, can request a formal ruling on Form CPT1, and workers often do so when they apply for EI and discover they have no insurable hours. Our answer on how the CRA decides between employee and contractor goes through the factors with examples.

What a CRA reassessment costs the payer

When a contractor is ruled an employee, the CRA assesses the payer for both the employer and the employee shares of CPP contributions and EI premiums for the years still open, plus a penalty of 10% of the amounts that should have been deducted, 20% for a further failure in the same year made knowingly or through gross negligence, and interest. Recovering the worker's share is your problem: the law only lets you deduct it from remuneration paid later in the same year, and for earlier years it is usually gone. Income tax the worker already paid is not charged twice, but the failure-to-withhold penalty can still apply to it.

Illustrative example: a cleaning company pays six crew members $40,000 each as contractors for three years. On reassessment, CPP at both shares is 11.9% of $36,500, about $4,340 per worker per year, and EI at 2.4 times a 1.64% rate is about $1,570. That is roughly $5,900 per worker per year, or about $106,000 across the group, before the 10% penalty, interest, and anything the Ministry of Labour or WSIB adds. Vacation pay at 4% would add close to $29,000 more on the same figures.

The Employment Standards Act: a prohibition with its own price list

Ontario's ESA expressly prohibits treating an employee as if they were not one. A reverse onus that briefly required employers to prove a worker was not an employee was introduced in 2018 and repealed in 2019, so the burden of proof is neutral again, but the prohibition stayed and employment standards officers apply much the same factors as the CRA. What changes on reclassification is the entitlement list: minimum wage, overtime after 44 hours a week at time and a half, vacation pay at 4% or 6%, public holiday pay for nine holidays, statutory leaves, and notice or pay in lieu on termination, with severance on top for longer service at larger employers. A worker can claim up to two years of unpaid amounts, and an officer can order payment, issue notices of contravention with escalating per-employee penalties, and refer serious cases for prosecution, where the maximum fine for an individual has been raised in recent years to as much as $100,000 as at the time of writing; confirm the current amounts with the Ministry of Labour. Separately, at common law, a long-serving "dependent contractor" who works mostly for one payer is owed reasonable notice on termination just as an employee would be, and that is often the largest single number in the file.

WSIB: premiums, claim costs and the construction rules

The WSIB applies its own worker-versus-independent-operator test and is not bound by a CRA ruling in either direction. If a contractor is found to be your worker, the Board assesses retroactive premiums with penalties and, if the person was injured on the job, can charge the claim costs to your account. Construction is the special case: since 2013 most independent operators, sole proprietors and partners in construction must carry their own coverage, and a business that hires one without a valid clearance certificate on file becomes liable for that person's premiums. Check the certificate before the first invoice, not after the first injury. Our answer on WSIB coverage for Ontario businesses covers the compulsory industries.

Incorporated contractors: the risk moves, it does not vanish

When the contractor bills through their own corporation, the payer is largely protected from CPP and EI reassessment, because the corporation is the individual's employer. The exposure shifts to the contractor: if they would be your employee but for the corporation, the CRA can treat it as a personal services business, deny the small business deduction and most expenses, and tax the income at roughly 44.5% combined in Ontario. Payers are not entirely clear either. Incorporation does not by itself prevent an ESA employee finding or a dependent-contractor claim, and the CRA's compliance letters to the trucking industry over its Driver Inc. model showed how quickly a sector-wide practice becomes a sector-wide review. Both sides should read what a personal services business is and how to avoid it before signing.

Where misclassification bites hardest

How to structure a contractor relationship that holds up

• Write the agreement around a deliverable or a defined project with an end date, priced as a fee rather than an hourly wage that mirrors a salary.
• Let the contractor decide when and where they work, and mean it. No timesheets for hours, no approval for days off, no slot in the staff rota.
• Require them to use their own equipment, carry their own insurance and, where relevant, hold their own WSIB coverage and clearance certificate.
• Include a genuine right to subcontract or send a substitute, and do not object when it is exercised.
• Expect them to have other clients, an HST number once their revenue passes $30,000, a business name or corporation, and invoices on their own terms.
• Keep them out of the org chart, the staff email signature block, the benefits plan and the holiday bonus list.
• Report what you pay: a T4A for fees for services, or a T5018 if you are in construction. See which contractors get a T4A and who must file a T5018.

If a relationship fails four or more of these, no wording will save it. Change the facts or change the classification.

When to convert a contractor to payroll

The signals are usually obvious in hindsight: the engagement has passed a year with no end in sight, the person works only for you, you have started managing them like staff, or you are preparing for a sale and a buyer's due diligence will ask exactly these questions. Convert deliberately. End the contractor agreement on its own terms, issue an employment offer with an ESA-compliant termination clause, decide whether prior service will be recognised, and set up payroll properly. The going-forward cost is the employer's CPP, EI, WSIB and vacation pay, about 10% on top of wages plus the paid time off; our post on the true cost of hiring your first employee in Ontario itemises it. For the years already behind you, the CRA's Voluntary Disclosures Program can cover unremitted source deductions where its conditions are met, and coming forward before a ruling request lands is materially cheaper than waiting for one. See how the Voluntary Disclosures Program works.

Our payroll service reviews contractor arrangements as part of onboarding, and for temporary help agencies and recruiters our staffing agency payroll page covers the licensing and joint-liability rules that make classification a daily question in that industry.

Sources: CRA — RC4110, Employee or Self-employed? · CRA — Form CPT1, Request for a CPP/EI Ruling.