Subcontractor vs Employee Tax Classification in Ontario
How the CRA decides whether a worker is an independent subcontractor or an employee, the control, tools, financial risk and integration tests, what misclassification actually costs, and how to get the classification right. Written by a licensed Canadian CPA.
In Ontario, the CRA decides whether a worker is a subcontractor or an employee by looking at the real working relationship, not the label on the contract. It weighs four main factors: control over how the work is done, who owns the tools and equipment, whether the worker can profit or take a loss, and how integrated the worker is into the business. The more the worker operates like an independent business, the more likely they are a subcontractor; the more they look and function like staff, the more likely they are an employee, regardless of what the agreement says.
Why the Classification Matters So Much
The label you put on a worker decides who pays what to the CRA. If a worker is an employee, the business must deduct income tax, CPP and EI from their pay, contribute the employer share of CPP and EI, and issue a T4. If a worker is a genuine subcontractor, none of that applies; the subcontractor invoices the business, charges HST where registered, and looks after their own taxes. Get it wrong, and the CRA can reassess the business for all the deductions that should have been withheld, plus the employer contributions, penalties and interest, often going back years.
The core principle: You cannot make someone a subcontractor just by calling them one in a contract or having them invoice you. The CRA looks at how the relationship actually works in practice, and that is what governs.
The 4 Tests the CRA Uses
There is no single rule that settles classification. The CRA and the courts weigh several factors together to judge whether the worker is in business for themselves or working for someone else's business. These four are the ones that carry the most weight.
- Control. Who decides how, when and where the work is done? An employer typically sets the hours, supervises the method and directs the work. A true subcontractor controls how they deliver the result and is hired for the outcome, not the process.
- Tools and equipment. Who provides the tools, vehicles and equipment? Workers who supply their own significant tools and equipment look more like an independent business. Workers who use everything the payer provides look more like employees.
- Chance of profit and risk of loss. Can the worker make a profit or suffer a loss from how they run the work? A subcontractor who quotes a price, manages costs and can lose money on a bad job bears business risk. An employee paid an hourly wage does not.
- Integration. Is the worker's activity an integral part of the business, or an accessory to it? Someone fully woven into the operation, working only for one payer over a long period, looks like an employee. Someone serving many clients as their own business looks like a subcontractor.
Subcontractor vs Employee: Side by Side
| Factor | Points to Subcontractor | Points to Employee |
|---|---|---|
| Control over the work | Worker decides how and when | Payer sets hours and method |
| Tools and equipment | Worker supplies their own | Payer provides them |
| Profit and loss | Can profit or lose on the job | Fixed wage, no business risk |
| Integration | Runs own business, many clients | Part of the business, one payer |
| Who can do the work | Can hire helpers or substitute | Must do the work personally |
| How they are paid | Invoices, often charges HST | Regular pay, T4, source deductions |
| Tax handling | Looks after their own taxes | Tax, CPP, EI withheld by payer |
No single row decides it. A worker can supply their own truck (pointing to subcontractor) yet be told exactly when and how to work and serve only one payer for years (pointing to employee). The CRA weighs the whole picture, which is why borderline cases need professional judgment.
What Misclassification Actually Costs
Treating an employee as a subcontractor is one of the most expensive payroll mistakes a business can make, because the liability lands on the payer, not the worker. If the CRA reassesses, the business can owe the income tax, CPP and EI that should have been withheld, plus the employer's share, plus penalties and interest.
| Consequence | Who Pays |
|---|---|
| Unremitted income tax, CPP and EI | The business (the payer) |
| Employer's share of CPP and EI | The business |
| Penalties for failure to deduct and remit | The business |
| Interest on the amounts owing | The business |
| Possible reassessment of multiple prior years | The business |
The hard part: The reassessment usually covers every year the worker was misclassified, not just the current one. A single misclassified long-term worker can turn into a multi-year bill. This is why getting the classification right at the start is far cheaper than fixing it after a CRA review.
Where Construction Companies Get Caught
Worker classification is a constant pressure point in construction, where it is common to bring on extra hands as "subcontractors" during busy stretches. If those workers use the company's tools, follow the site supervisor's direction, work set hours and have no other clients, the CRA may view them as employees no matter what the paperwork says. Because construction also requires a T5018 information return on subcontractor payments, a classification error often surfaces during exactly the kind of review where the CRA is already matching those figures. For a fuller picture of how this fits the broader rules builders face, see our overview of construction accounting services.
How to Protect Your Business
You cannot guarantee a classification, but you can build a relationship that genuinely supports the one you intend and document it properly.
- Make the working relationship match the label in practice, not just on paper.
- Have genuine subcontractors invoice you, and keep those invoices.
- Let subcontractors control how they deliver the work and use their own tools where possible.
- Avoid treating a long-term, single-client worker as a subcontractor indefinitely.
- Keep written agreements, but understand they do not override how the relationship actually works.
- When a worker is genuinely staff, set up payroll properly from day one.
A useful test: Ask whether the worker is running their own business or working in yours. If they serve many clients, carry their own risk and control their own work, they are likely a subcontractor. If they are embedded in your operation under your direction, they are likely an employee.
Case Study: Misclassified Site Workers, GTA Contractor
A GTA contractor had paid several long-term site workers as subcontractors for three years. The workers used the company's tools, followed the foreman's daily direction, worked the company's hours and had no other clients. When the CRA reviewed the file, it reassessed the workers as employees and the company faced unremitted source deductions, the employer's share of CPP and EI, penalties and interest across all three years. We reviewed every working relationship, corrected the classifications going forward, set up proper payroll for the genuine employees, and helped the company respond to the CRA so the exposure was resolved and the same mistake would not recur.
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