Employee or Contractor? The Misclassification Mistake That Can Cost You Years of Back Taxes

It's one of the most common arrangements in Canadian small business: you need help, you don't want the cost and paperwork of payroll, so you bring someone on "as a contractor." They invoice you, you pay the invoice, and everyone assumes that settles the tax question.

It doesn't. Whether a worker is an employee or a self-employed contractor is a question of fact, not a question of what you called them or what the contract says. The CRA — and the courts — look at how the relationship actually works. Get it wrong, and the consequences fall hardest on the business that did the hiring.

Read on for how the four-factor test works, what a reassessment actually costs, the personal-services-business trap, and a checklist.

Why the label on the invoice is irrelevant

The distinction matters because employees and contractors are treated completely differently under three pieces of federal law: the Income Tax Act, the Canada Pension Plan, and the Employment Insurance Act.

For an employee, the employer must register a payroll account, withhold income tax, deduct CPP and EI, add the employer's share of CPP and EI, remit it all on schedule, and issue a T4. For a contractor, none of that applies — the worker handles their own taxes and CPP (and, once they pass the threshold, their own GST/HST registration), and there's no EI at all.

So when a business treats someone as a contractor who the CRA later decides was really an employee, an entire chain of obligations was skipped. The CRA's job is to collect what should have been remitted — and it looks to the payer first.

The four factors the CRA actually weighs

There is no single deciding factor and no points system. The governing question, set out by the Supreme Court of Canada in 671122 Ontario Ltd. v. Sagaz Industries and drawing on the Federal Court of Appeal's framework in Wiebe Door Services v. M.N.R., is this:

To answer it, the CRA weighs four central factors. The more each one points toward independence, the stronger the case for contractor status.

Sources: Wiebe Door Services Ltd. v. M.N.R., [1986] 3 F.C. 553 (FCA); 671122 Ontario Ltd. v. Sagaz Industries Canada Inc., 2001 SCC 59; CRA, Employment status: Employee or self-employed (the guidance that replaced Guide RC4110 on January 30, 2026) and Determine the relationship with the employer or the payer.

Quebec uses its own framework

If your worker is in Quebec, there's an added layer. The federal CPP, EI, and income-tax analysis still applies, but Quebec's Civil Code has its own definition of a contract of employment, and the QPP (Quebec Pension Plan) replaces CPP. Revenu Québec runs a parallel analysis. The factors overlap heavily with the federal test, but you can't assume a "contractor" treatment that works elsewhere will automatically hold in Quebec — review both.

What a reassessment actually looks like

This is the part that surprises people. When the CRA reclassifies a contractor as an employee, it does not split the bill fairly. The payer — the business — becomes liable for the amounts that should have been withheld and remitted:

1. Both halves of CPP and EI. Normally the employee pays their share through payroll deductions. But because you never deducted it, the CRA assesses the employer for the employee's share and the employer's share. You can try to recover the employee's portion from the worker, but that's your problem, not the CRA's.

2. Income tax that should have been withheld, plus penalties for failure to deduct and arrears interest, compounded daily, running back to when each remittance was due.

3. It compounds across every year and every worker. If you've treated three people as contractors for four years and the CRA reclassifies them, you're looking at four years of remittances, penalties, and interest — multiplied by three.

"But they have a corporation" — the personal services business trap

A common workaround is to have the worker incorporate and invoice through their company. Sometimes that genuinely reflects an independent business. But if the only reason the corporation exists is to deliver one person's services to one client — and that person would be an employee if you stripped the corporation away — the CRA can treat it as a personal services business (PSB).

A PSB is taxed harshly on purpose. It cannot claim the small business deduction, it's taxed at a higher corporate rate, and it's denied almost all ordinary business deductions — it can essentially only deduct salary paid to the incorporated employee and a few specified costs. The result is one of the worst tax outcomes in the Act. Incorporation is not a shield; it can make things worse.

Source: Income Tax Act — definition of "personal services business" in subsection 125(7), and the deduction restriction in paragraph 18(1)(p). The PSB rules deny the small business deduction and most operating deductions.

You can ask the CRA before there's a problem

If you genuinely aren't sure where a relationship falls, you don't have to guess. Either the worker or the payer can request a CPP/EI ruling from the CRA, which formally determines whether the work is pensionable (CPP) and insurable (EI) — in other words, whether the person is an employee or self-employed. It's free, and a ruling obtained in advance is vastly cheaper than discovering the answer through a reassessment two years later.

A practical checklist

Before you bring someone on "as a contractor," run through these:

• Who controls how, when, and where the work is done — you or them?
• Whose tools and equipment are being used?
• Can the worker profit from doing the job efficiently, or lose money on it?
• Can they send someone else or subcontract the work?
• Do they have other clients, their own business presence, and their own liability?
• Is there a written agreement that reflects the real arrangement (not one that contradicts it)?
• If they're incorporated, would they be your employee without the corporation? (PSB risk.)
• If you can't answer confidently, have you considered a CPP/EI ruling?

The cheapest time to get this right is before the first invoice. Keeping worker classifications clean — and the payroll set up correctly when someone really is an employee — is part of what's included in every CDL plan, and you can estimate the cost in about a minute.

Treat the relationship the way it really works

There's nothing wrong with using contractors — most small businesses do, and many of those relationships are genuinely independent. The mistake is assuming a label settles the question. It doesn't. The CRA looks through the paperwork to the substance of the relationship, and if the substance says "employee," the contract won't save you.

If you have people working for you and you're not certain how they should be classified, that's worth sorting out now — while you still have the cheap options.

How a "contractor" became a $40,000 surprise

Meet Devon, who runs a small web-design studio in Halifax. As the work piled up, he brought on Marc "as a contractor" to handle design. Marc works 9-to-5 at Devon's studio, on Devon's computer, takes daily direction on what to build, has no other clients, and sends a flat monthly invoice. To Devon, the invoice settled the tax question.

Two years later, the relationship ends and Marc applies for EI — which triggers a CRA ruling on whether his work was insurable. The verdict: Marc was an employee the whole time. Devon controlled the work, supplied the tools, and Marc carried no financial risk and couldn't subcontract. The studio is assessed for both the employer and employee shares of CPP and EI, plus the income tax that should have been withheld — across two years, with interest.

What should have happened: a two-minute look at control, tools, and risk would have flagged Marc as an employee from the first day — and a free CPP/EI ruling would have settled it before it became a five-figure bill.

This article is for informational purposes only and does not constitute tax or legal advice. Worker-classification outcomes are fact-specific, the rules differ in Quebec, and rates change. The CPP/EI figures cited are illustrative and current as of 2026. Consult a qualified professional before classifying a worker or relying on a particular treatment.

Primary sources, linked so you can read and interpret them yourself. Government and legislative links open on official Government of Canada websites; case law opens on CanLII.

• 671122 Ontario Ltd. v. Sagaz Industries Canada Inc., 2001 SCC 59 (Supreme Court of Canada — the "in business on their own account" test)
• Wiebe Door Services Ltd. v. M.N.R., 1986 CanLII 6775 (FCA) (the four-factor framework)
• CRA — Employment status: Employee or self-employed (replaced Guide RC4110 on January 30, 2026)
• CRA — Determine the relationship with the employer or the payer
• Income Tax Act (Canada), Justice Laws Website: section 125 (subsection 125(7) defines "personal services business"); section 18 (paragraph 18(1)(p) restricts PSB deductions)
• Canada Pension Plan (R.S.C., 1985, c. C-8) — pensionable employment
• Employment Insurance Act (S.C. 1996, c. 23) — insurable employment
• Related reading: Should You Incorporate? (including the personal-services-business trap), The $30,000 Question (GST/HST for contractors), and Salary vs. Dividend