Suppose an IT consultant provides the same services to the same client before and after incorporation. The day-to-day work may barely change, but the tax question does. Before incorporation, the individual can face a direct employee-versus-self-employed determination. After incorporation, the corporation may face the personal services business (PSB) rules if the statutory conditions are met. Incorporating does not establish that the underlying relationship is an independent business; remaining a sole proprietor avoids the PSB regime but does not settle employment status. CRA: IT consultants; CRA: PSB conditions.
This article compares classification exposure. For the broader decision about tax deferral, administration and personal cash needs, use the sole proprietor versus corporation guide. For the complete corporate rules, use the existing PSB guide and PSB Risk Review.
The two legal questions
For a sole proprietor, the question is whether the individual is carrying on a business on their own account or working as an employee of the relevant payer. An agreement, invoices, GST/HST registration, one client, hourly billing or the worker’s laptop cannot individually answer it. The contract and the actual working relationship must be examined. See the detailed self-employed IT contractor guide.
For an incorporated consultant, the PSB question is whether the corporation meets all of the statutory conditions, including whether the person doing the work would reasonably be considered the client’s employee if the corporation did not exist. That is a hypothetical test used to determine the corporation’s income-tax treatment. The corporation’s specified-shareholder, employee-count and associated-corporation conditions also matter. A single client is not itself a statutory PSB test. Income Tax Act, subsection 125(7); CRA: PSB conditions.
The same evidence—client control, genuine substitution, project risk, opportunity for profit and how the consultant operates outside this client relationship—may be relevant to both inquiries. The legal consequences are different. CRA’s IT consultant guidance notes that secure equipment, team coordination, and one payer at a time can be neutral in context.
Comparison at a glance
| Question | Sole proprietor | Incorporated consultant |
|---|---|---|
| Who earns the client receipts? | The individual. | The corporation, assuming the corporate contract and payment flow are respected. |
| Classification question | Is the individual an employee or in business independently under the actual engagement? | Does the corporation carry on a PSB, including the hypothetical employee-like condition and all other statutory conditions? |
| Main income-tax adjustment | Business receipts and deductions may need to be treated as employment income and eligible employment expenses. | PSB income can lose the small business deduction and general rate reduction, face restricted corporate deductions and an additional federal PSB tax. |
| Owner pay | There is no salary or dividend paid by the sole proprietorship to its owner. | Salary and dividends paid by the corporation have distinct tax and payroll effects; their timing and treatment matter to the reassessment. |
| CPP/EI | Employment status, pensionability and insurability may lead to payroll adjustments; placement agencies require separate analysis. | A PSB finding does not automatically make the client the worker’s employer for CPP/EI. Payroll on any salary paid by the corporation is a separate issue. |
| GST/HST | If the work was employment, invoices, remitted tax and claimed input tax credits require review. | A PSB remains a corporation supplying services; PSB status alone does not make its invoices employee wages or automatically undo GST/HST. |
| Payer exposure | The actual employer or responsible agency may face withholding, employer contributions and reporting issues. | The client does not automatically acquire payroll obligations merely because its supplier is a PSB; the corporate and agency facts still matter. |
The PSB consequences come from CRA’s PSB guidance. CRA’s IT consultant guidance explains that a worker serving a client through their own corporation is generally not treated as that client’s employee for CPP/EI merely because of the corporate arrangement. Neither statement removes the need to review the actual contracts and payments.
Which structure creates greater reassessment risk?
There is no sound one-word answer. Legal classification risk asks whether the particular facts satisfy the relevant legal test. Incorporation changes the test and adds the corporate PSB conditions; it does not change whether a client sets hours, controls tasks or requires personal service. A consultant with genuine project discretion may have a strong independent-business case in either structure. A person occupying a staff role may have a serious issue in either, but the issue manifests differently.
Probability of review is a separate question. CRA has publicly described PSB outreach and review activity, including activity concentrated in particular sectors. That is not a reliable IT-specific comparison of sole-proprietor and corporate audit probabilities. We would not infer from it that incorporated IT contractors are necessarily more likely to be examined.
Financial consequences if challenged successfully can be substantial on either side. A sole proprietor may lose business deductions and face payroll, CPP/EI and sales-tax corrections across the worker and payer. A corporation with PSB income can face a materially higher corporate tax burden and restricted expenses, with additional implications for how the owner was paid. The amount depends on taxable income, deductions, salary versus dividends, province, years open for reassessment and tax already paid. Comparing headline corporate tax rates with the sole proprietor’s gross billings would be misleading. CRA: PSB tax obligations.
Why a PSB determination is not a payroll ruling
The phrase “would be an employee without the corporation” can sound as if CRA has made the client the person’s actual employer. That is not what the PSB test itself does. CRA says one cannot request a CPP/EI ruling on that hypothetical PSB condition; a ruling can address an actual worker-corporation relationship. A corporation paying the consultant salary has its own payroll obligations, while dividends have different treatment. See CRA’s PSB ruling explanation and salary versus dividends for IT contractors.
The agency and Quebec complications
If a staffing agency stands between the consultant and the end client, draw the payment and contractual chain before applying either comparison column. For an individual placed by an agency, specific CPP/EI rules may apply depending on direction, payment and the agency’s role. For a corporation paid by an agency, establish the corporation’s actual payer and assess the PSB conditions for that relationship; the end client’s operational control still matters to the hypothetical employee-like analysis. Do not assume one universal result for all agency engagements.
In Quebec, the employee-versus-business inquiry must be framed under the Civil Code’s employment and services provisions, particularly the relationship of subordination. Quebec source deductions, QPP, QPIP and QST may also affect the consequence analysis. A federal common-law checklist should not simply be copied into a Quebec file. CRA RC4110; Revenu Québec: Employment status.
Before changing structure
If a client or agency asks you to incorporate, review the current and proposed contracts and the actual working practices. Identify who controls the work, who can replace the named consultant, who bears correction costs, whether there are genuinely separate mandates, and who will invoice and pay whom. Then compare the classification consequences with the financial and administrative reasons for incorporation. The incorporation guide covers the broader decision; the self-employed status guide provides questions to document the engagement.
Teplov CPA’s PSB Risk Review addresses incorporated client relationships. For a structure change or a sole-proprietor status concern, contact the firm with the agreement, payment chain and a summary of how the work is directed in practice.