The Consequences of Misclassifying Workers in Ontario

Calling someone a "contractor" does not make them one. If an Ontario business treats a worker as an independent contractor when the real relationship looks more like employment, the label on the invoice will not protect it. Worker misclassification in Ontario can expose a business to retroactive employment entitlements, payroll tax reassessments, and — in some cases — personal liability for the people running the company.

This is one of the more expensive mistakes a growing business can make, because it is rarely caught until something goes wrong: a contractor is let go and disputes the terms, or a government review takes a closer look at how the business pays its people. By then, the exposure has often been building for years.

Below is an overview of where that exposure comes from and what it can look like in practice.

What Counts as Misclassification

Misclassification happens when a worker is paid and treated as an independent contractor, but the substance of the relationship — how much control the business exercises, how integrated the worker is into the business, whether the worker bears any real business risk — looks like an employment relationship instead. Ontario also recognizes a "dependent contractor" middle category, where a worker is not a full employee but is economically dependent on one client.

There is no simple checklist that determines classification on its own; it is a substance-over-form question that a court, tribunal, or government reviewer will assess on the full relationship, not on what the contract calls the worker.

The ESA Exposure: Back Pay and Notice

If a worker is found to have been an employee all along, the Employment Standards Act, 2000 applies retroactively to that relationship. That can mean:

• Statutory notice of termination (or pay in lieu), which the ESA guarantees after three months of service and which cannot be contracted below.
• Unpaid overtime, vacation pay, or public holiday pay the worker should have received as an employee.
• Potential severance pay, if the business and the length of service meet the ESA's eligibility criteria.

A worker found to be a dependent contractor, rather than a full employee, may not fall under the ESA itself but can still claim common-law reasonable notice — a separate, fact-specific concept that is not governed by a fixed formula.

Payroll Tax and Source Deduction Exposure

Employers are required to withhold and remit source deductions (income tax, CPP, EI) from employee pay, register for WSIB coverage, and account for payroll under the Employer Health Tax. A business that paid a worker as a contractor — without withholding any of this — can face a retroactive assessment for the source deductions it should have withheld, plus interest and penalties, once the relationship is recharacterized as employment.

This exposure runs alongside, not instead of, the ESA exposure described above — a single misclassification finding can trigger both at once.

Personal Liability for Directors

Incorporating a business does not, on its own, put every consequence of misclassification safely behind the corporate veil. Certain statutory director liabilities — including for some unremitted source deductions and unpaid wages — can reach an individual director personally, separately from whatever the corporation itself owes.

How This Usually Comes to Light

Misclassification rarely surfaces on its own initiative. In practice, it tends to come up in one of a few ways:

1. A contractor is terminated and, through a demand letter or lawsuit, argues they were really an employee (or dependent contractor) entitled to notice.
2. A government review — payroll tax, WSIB, or otherwise — looks at how a business classifies its workers as part of a broader review.
3. A worker applies for a benefit that requires an employment relationship, prompting a closer look.

By the time any of these happens, the exposure has usually accumulated across the full length of the relationship, not just the most recent pay period.

Reducing Your Exposure

• Review long-standing contractor relationships against the substance of how they actually operate, not just the paperwork.
• Put a properly drafted, written agreement in place for every contractor, and revisit it if the relationship's nature changes over time.
• Do not assume that paying a contractor through their own corporation resolves the classification question — the analysis is about substance, not the vehicle used to invoice.
• Get a legal review before a contractor relationship ends, not after a demand letter arrives.

Frequently asked questions