Could CRA treat my corporation like I am really an employee?

One client is a flag, not a verdict

Client concentration is where every personal services business review starts, and it is never where it ends. The legal test does not count your clients; it asks whether you would reasonably be regarded as an employee or officer of the client if your corporation did not exist. Plenty of one-client corporations are genuine businesses: a contractor mid-way through a long project, a consultancy that lands one dominant engagement for a year, a specialist whose field only has a few buyers. And a corporation with three clients can still be a PSB with respect to one of them if that relationship looks like a job.

What one main client does is remove your best evidence. Multiple concurrent clients are the single clearest marker of being in business on your own account, so without them, the answer gets decided on the texture of the relationship: who controls the work, whose tools you use, whether you can profit or lose money, whether you could send someone else. That is why two people with identical invoices can get opposite answers, and why the honest response to the reader's question is: it depends on facts you can actually go and check, and most of them are written in your contract.

How the arrangement began is itself one of those facts. Many one-client corporations were not the owner's idea: the client or a staffing agency required incorporation as a condition of the engagement, often to move payroll obligations off their books. That origin cuts the wrong way, because a role that was a job until the paperwork changed, same desk, same manager, same duties, is the textbook fact pattern the rules were written for. If you incorporated at a client's request and nothing else about the working day changed, treat this page as directly about you.

What a personal services business actually is

A personal services business is a corporation that exists between an employer and someone who would otherwise be their employee. The definition has four moving parts, and all of them have to be present:

• An incorporated employee: an individual who performs the services on behalf of the corporation, and who, but for the corporation, would reasonably be regarded as an employee or officer of the client.
• A specified shareholder: the incorporated employee, or someone related to them, owns 10 per cent or more of any class of the corporation's shares. For a typical owner-manager who owns the whole company, this is automatic.
• No employee-count carve-out: the rule does not apply if the corporation employs more than five full-time employees throughout the year. A real staffed business is outside the regime by definition.
• No associated-corporation carve-out: services provided to an associated corporation are also outside the rule; the target is arm's-length client relationships that mimic employment.

Notice what is absent from the definition: revenue size, industry, and how you pay yourself. An incorporated IT contractor billing one bank, a trucker driving for one carrier, a physician's corporation working entirely inside someone else's clinic structure, and an executive who incorporated at their employer's suggestion can all sit inside it. The regime exists because incorporation would otherwise convert employment income taxed at full personal rates into active business income taxed at the small business rate, and Parliament closed that door decades ago; the question on any file is only whether the underlying relationship is employment in substance. What counts as genuine active business income is the other half of that same line.

The relationship tests: how the employee question actually gets answered

The employee question is answered with the same factors courts use to separate employees from independent contractors, applied as if the corporation were not there. Four of them do most of the work:

• Control: who decides what is done, when, where and how. Set hours, an assigned manager, required attendance and needing permission to take other work all read as employment; controlling your own method, schedule and priorities reads as business.
• Tools and equipment: whose laptop, licences, truck or premises the work runs on. Working entirely on the client's systems under the client's security badge is an employment fact; owning the significant tools of the trade is a business fact.
• Chance of profit, risk of loss: fixed-price work, unbillable rework, real expenses, bad-debt exposure and the ability to profit from efficiency are business facts. A guaranteed hourly or daily rate with expenses reimbursed carries neither risk nor upside, which is what a wage is.
• Integration and substitution: whether you appear inside the client's organization chart doing what employees beside you do, and whether you could send a qualified substitute. A genuine right to subcontract the work is one of the strongest business facts there is.

No single factor decides it, and the written contract only matters to the extent the day-to-day facts match it. A contract reciting independence while the client sets your hours, supplies your laptop and lists you in the team directory supports the wrong conclusion. When we assess a file, we read the contract and then ask what a Tuesday actually looks like, because that is exactly what an auditor does.

It is worth knowing how the question arrives in practice. PSB reviews typically begin with a questionnaire to the corporation or the client, asking about hours, supervision, equipment, exclusivity and how the engagement is described internally; contracts, invoices and emails follow. Some industries see periodic campaigns, incorporated IT contractors, drivers and placement-agency workers have all had waves of attention, so a quiet history is not evidence the structure is safe. The file you would show a reviewer is being written now, in how the engagement actually runs, which is why we fix facts and paper together rather than waiting for the letter.

What a PSB finding costs: the rate, the deductions, and the years already filed

The consequences are the reason the label matters, and they come in three layers. First, the rate: PSB income is carved out of the small business deduction and the general rate reduction, and since 2016 it carries an additional 5 per cent federal tax on top. In Ontario the combined corporate rate on PSB income works out to roughly 44.5 per cent, against the 12.2 per cent small business rate most owner-managed corporations pay on their first 500,000 dollars. The deferral that justifies incorporating is not just reduced; it is inverted, because 44.5 per cent inside the corporation is close to the top personal rate with none of the flexibility.

Second, the deductions. A PSB may deduct the salary and benefits it pays the incorporated employee, and little else: the office rent, software, home office, vehicle, marketing and professional fees a normal corporation writes off are denied, though amounts that would be deductible by an employee, such as certain commissioned-sales expenses, and legal costs of collecting fees survive. Corporate profit becomes almost impossible to shelter, which is why the salary fallback in the last section matters so much.

The sting has a second layer when the money finally reaches you. Profit that bore the PSB rate still has to come out as a dividend, which is taxed again on your personal return, and the combined corporate-plus-personal burden on that path is generally worse than if the client had simply employed you and paid you the same amount as wages. The corporation is not sheltering income at that point; it is adding a layer of tax and a set of filings to income that would have been cheaper as a paycheque.

Third, the timeline. PSB status is found on audit, after the fact, and CRA can reassess the open years together. That means several years of denied deductions and rate difference plus arrears interest arriving as one letter, on income you have already spent or reinvested. The finding does not undo the HST you correctly charged, and it does not convert you into an employee for CPP, EI or severance purposes at the client; you collect the burdens of the corporate structure without its benefits. This asymmetry, cheap to fix in advance and expensive to lose later, is the practical reason the question deserves an hour of attention now.

The facts that change the answer

When we assess PSB exposure, these are the six facts that move the conclusion, roughly in order of weight:

• Concurrent clients: genuinely serving several clients at once is the strongest single business fact; one client year after year is the strongest flag.
• Who controls the how: your methods, hours and location versus the client's direction and supervision.
• Whose tools and premises: your equipment, licences and insurance versus their laptop, badge and desk.
• Financial risk: fixed-price exposure, unreimbursed costs and the chance to profit from efficiency versus a guaranteed rate for hours.
• The right to substitute or subcontract: a real, exercised right to send someone else versus services that must be you personally.
• Headcount: more than five full-time employees throughout the year takes the corporation out of the definition entirely.

Weigh them the way a reviewer would: as a picture, not a checklist. A contractor with two concurrent clients, their own tools, errors-and-omissions insurance and a substitution clause they have actually used is comfortably in business. A ten-year, one-client engagement on the client's systems, at their office, at a daily rate, with four weeks of approved vacation, is an employment relationship with a corporation standing in front of it, whatever the contract says on page one.

If some of this sounds like you: what to do this year

The first move is defensive and costs nothing in tax: pay yourself salary from the corporation rather than accumulating profit inside it. Salary to the incorporated employee is the one deduction a PSB keeps, so a corporation that pays its profit out as salary each year has almost nothing left exposed to the 44.5 per cent rate even if CRA later wins the argument. The price is giving up the deferral, but on facts that look like employment, the deferral was never safely yours; what that deferral is normally worth, and when it makes sense to use it, is covered in how much cash should stay inside my corporation.

Timing matters with the salary defence: it works prospectively, year by year, because salary has to be paid or properly accrued and remitted through payroll in the year the corporation earns the income. It is not something that can be retrofitted onto three reassessed years after an audit letter arrives. A corporation that runs the fallback from the start converts the PSB question from an existential risk into a modest one about a single year's timing differences.

The second move is to change the facts that can honestly be changed: contract terms that reflect real independence, your own tools and insurance, control over method and schedule, a genuine second client where the market allows it. What you should not do is decorate the file, a second client invented for optics or a contract nobody follows adds risk rather than removing it, because it shows you knew the test and dressed for it.

The third move is to price the question into your structure once, properly. This is a fact assessment plus a compensation design, exactly the work a corporate tax planning CPA in Ontario does inside Corporate Tax engagements, and it sits within the wider owner playbook in corporate tax planning for owner-managed businesses. If your corporation invoices one main client today, a free 15-minute discovery call is enough for us to tell you which side of the line your facts sit on and whether the salary fallback should start this year.