Personal services business risk: why a single-client contractor is exposed

Incorporating is one of the most common moves a contractor makes once their income grows — and for good reason. But incorporation alone doesn't guarantee you get taxed like a business. If the CRA looks at your corporation and concludes that, contract aside, you're really just an employee of your one client working through a corporate shell, it can reclassify you as a personal services business. That single label can undo most of the tax advantage incorporation was supposed to provide. This is the most consequential tax risk many incorporated contractors don't fully understand, so it's worth getting precise about.

What a personal services business actually is

A personal services business exists when an individual (called an “incorporated employee”) provides services through their corporation to another entity, and if the corporation didn't exist, that individual would reasonably be considered an employee of the entity receiving the services. In other words, the CRA looks through the corporation to the underlying relationship between the person doing the work and the client paying for it.

The rule exists because incorporating creates real tax advantages — deferral, income splitting opportunities, access to lower corporate rates — that were designed for active businesses taking on real risk and effort, not for individuals who've simply relabelled an employment relationship as a consulting arrangement. Where the substance is employment, CRA wants the tax outcome to look like employment too.

The incorporated-employee test: what CRA actually weighs

There's no single factor that decides PSB status on its own. CRA and the courts weigh the same general factors used to distinguish employees from independent contractors in any context, applied to the corporation's relationship with its client:

• Control — who decides how, when and where the work gets done: the worker, or the client?
• Ownership of tools and equipment — does the corporation supply its own tools, software and equipment, or does it use the client's?
• Chance of profit and risk of loss — does the corporation carry genuine financial risk (fixed-price work, its own overhead, potential for loss), or is it simply paid for time worked with no downside?
• Ability to subcontract or hire help — can the corporation send someone else to do the work, or must the specific individual personally perform it?
• Integration — does the worker function as part of the client's organization (client email, client supervision, embedded in the client's team) rather than as an outside supplier?

No factor is decisive on its own, and CRA looks at the whole relationship, not a checklist score. But the more these factors point toward “employee,” the greater the risk.

Why a single-client contractor is exposed

Many incorporated contractors — especially in construction, trades, IT and professional services — work through their corporation for one client at a time, often for months or years in a row, on the client's schedule, using the client's tools, reporting to the client's supervisor. That pattern is common, understandable, and also exactly the fact pattern CRA looks for. It doesn't matter that the paperwork calls the arrangement a “consulting agreement” between two corporations. Substance governs.

This doesn't mean every single-client contractor is automatically a PSB. Genuine project-based engagements, defined deliverables, and real business risk can coexist with a dominant client. But the fewer of the “independent business” markers you have, the thinner your protection.

The consequences of PSB status

If your corporation is assessed as a PSB, three things happen at once, and none of them are minor:

• No small business deduction. The reduced rate available to active Canadian-controlled private corporations — including the roughly 9% federal small business rate on qualifying income — simply doesn't apply to PSB income.
• No general rate reduction, plus an additional federal tax. PSB income is taxed at a materially higher corporate rate than ordinary active business income, because the general rate reduction is denied and an additional federal tax applies on top.
• Severely restricted deductions. A PSB generally can't deduct the usual range of business expenses. The main deduction allowed is salary and wages paid to the incorporated employee, plus the cost of certain benefits and a short list of other specified expenses — not the broader deductions an active business normally claims.

Put together, PSB status can mean paying corporate tax at a much higher effective rate on income that has fewer deductions available against it — while the reassessment can also reach back over prior years if CRA audits and disagrees with how the relationship was reported.

Practical steps to reduce PSB risk

You don't need to turn down good long-term client relationships to manage this risk — you need the relationship to look, in substance, like business-to-business work rather than employment. Some practical levers:

• Diversify your client base where possible, rather than relying on one dominant, ongoing relationship.
• Negotiate the right to subcontract or bring in help, even if you rarely use it — the contractual ability matters.
• Use your own tools, software and equipment where practical instead of relying entirely on what the client supplies.
• Take on genuine financial risk — fixed-price components, your own liability insurance, exposure to loss on a project — rather than being paid purely for hours worked with no downside.
• Retain control over how and when the work gets done, to the extent your industry allows it.
• Review your contracts and working arrangement periodically with your CPA, not just in year one — relationships drift over time, and a contract that looked fine at signing can look very different three years in.

The bottom line

Incorporating isn't the risk — how the working relationship is actually structured is. A single dominant client, client-set hours, client-supplied tools and no ability to subcontract are the pattern CRA looks for, and the consequences of getting reclassified are serious enough that they deserve an annual check-in, not a one-time decision at incorporation. If you're an incorporated contractor working primarily for one client, a short review of your contracts and working arrangement is the cheapest insurance you can buy against this risk.

This article is general information for Canadian business owners and is current as of July 2026. It is not tax, legal or accounting advice, and it does not create a client relationship. Tax rules change and your situation is unique — please speak with a CPA before acting on anything here.

About the author

Sunny Dhillon, CPA

Founder of EverStone CPA, an Abbotsford CPA firm, and a member of the Chartered Professional Accountants of British Columbia (CPABC). Sunny works with incorporated contractors and small business owners across Canada on tax, bookkeeping and advisory. More about Sunny →