Incorporating a Side Business With One Client: The Personal Services Business Risk

Incorporating a side business feels like a natural step once you land a steady contract — it looks more professional, it can offer a tax deferral advantage, and it separates the work from your personal finances. But if that "side business" really means one corporation providing your personal services to one client, on an ongoing basis, you may have built something the CRA calls a personal services business — and the tax consequences of that label are worse than staying unincorporated in the first place.

This isn't a rare or aggressive CRA position. It's a well-established part of how the Income Tax Act treats incorporated workers who look, in substance, like employees of the company paying them. Understanding the test now — before you set up the structure, or before you renew a single-client contract for another year — is far cheaper than discovering it on reassessment.

What a Personal Services Business Actually Is

A personal services business arises when a corporation is used to provide the services of one individual (usually its owner) to another entity, and that individual would reasonably be considered an employee of the client if the corporation didn't exist. In plain terms: the CRA looks past the corporate structure and asks whether the underlying relationship is really employment wearing a corporate name tag.

This is the same substance-over-form question CRA and the courts ask when sorting employees from independent contractors generally — looking at control over the work, who owns the tools and equipment, whether there's a genuine chance of profit or risk of loss, and how integrated the worker is into the client's operations. A personal services business finding simply applies that same lens to a worker who happens to route their services through a corporation instead of contracting personally.

Why One Client Is the Biggest Red Flag

Having a single client isn't automatically disqualifying, but it's one of the strongest indicators CRA and the courts weigh, because it tends to point toward the same conclusions as the underlying employee-versus-contractor test:

• Integration. A worker who spends all their time inside one organization, following its schedule and reporting lines, looks integrated into that business rather than running an independent one.
• Control. A single client that directs how, when, and where the work gets done — rather than simply specifying a deliverable — looks more like an employer than a customer.
• Limited risk and reward. A corporation with one revenue source, paid a steady rate regardless of how efficiently the work gets done, has little of the profit potential or financial risk that distinguishes an independent business from a job.
• Reliance on the client's tools and workspace. Using the client's equipment, systems, email address, or premises reinforces the picture of an employee, not a separate business.

None of these factors is decided by counting clients alone — a corporation with several clients can still be found to be a personal services business, and one with a single large client can sometimes survive scrutiny if the other factors point the other way. But a single, long-running client is the fact pattern that draws the closest look.

What It Costs You If CRA Reclassifies the Income

A personal services business loses two of the main tax advantages of incorporating in the first place:

• No small business deduction. Income from a personal services business doesn't qualify for the lower small-business corporate tax rate, so it's taxed at a materially higher corporate rate than a genuine active business would pay.
• A much narrower list of deductible expenses. A personal services business can generally only deduct salary and benefits paid to the incorporated worker, plus certain limited costs of selling — similar to the restricted deductions available to an employee, not the broader deductions available to an active business.

Combined, this often means more total tax is paid through the corporate structure than if the individual had simply been an employee or an unincorporated contractor to begin with — the opposite of what incorporating was meant to achieve.

Factors That Make the Structure More Defensible

No single item on the right flips the analysis on its own — CRA and the courts weigh the whole relationship — but a structure that checks several of the "stronger position" boxes has a real chance of holding up, while one that checks none of them is a target.

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