Incorporate when your practice earns clearly more than you live on and you can leave the difference in the company. Profit kept in an Ontario corporation is taxed at roughly 11 to 12 percent instead of personal rates that pass 50 percent, but that gap only matters if money actually stays behind. In Ontario you’ll also need a physiotherapy professional corporation authorized by the College, not a plain numbered company. If you draw out everything you earn, incorporation mostly adds cost.
Physios tend to ask this question at two moments: when the first good tax bill lands as a sole proprietor, and when a clinic they work with starts paying their corporation instead of them. The answer doesn’t depend on your billings. It depends on what’s left after you’ve paid for your life.
The deferral is the whole game
A corporation is a separate taxpayer. Active income it keeps is taxed at the small-business rate, which in Ontario works out to about 12.2 percent combined on the first $500,000, dropping to about 11.2 percent for profit earned after July 1, 2026. Your personal rate on the same dollars can run past 53 percent at the top end.
That gap looks like a saving, but it’s really a deferral. The moment you pay yourself so you can live, the personal tax arrives. The benefit is real only when there’s profit left inside the company after your draws, sitting there to invest or to smooth out a slow year. A physio earning $140,000 who lives on $90,000 has something to defer. A physio earning $140,000 who spends $140,000 doesn’t.
That second physio should usually wait.
Ontario physios need a professional corporation
You can’t just register a numbered company and bill physiotherapy through it. Ontario requires a health profession corporation with a certificate of authorization from the College of Physiotherapists, renewed every year, and the corporation can only practise physiotherapy and the activities that go with it. Every shareholder, officer, and director has to be a physiotherapist registered with the College. We cover how these structures work across professions in our guide to the health professional corporation.
Here’s the trap: the income-splitting setup your physician friends describe doesn’t apply to you. Physicians and dentists are allowed to issue non-voting shares to family members. Physiotherapists aren’t, so dividends to a spouse through the corporation are simply off the table. The remaining route is paying a family member a reasonable salary for work they genuinely do, which is a much narrower lane than people expect.
You keep a surplus
You consistently earn more than you spend, you want profit compounding inside the company, and you expect to practise for years. The deferral does real work.
You spend what you earn
Your draws roughly match your income, or your caseload is still building. You’d be paying setup and annual costs to defer very little.
What incorporating won’t change
Your HST position stays exactly where it was. Physiotherapy treatment is an exempt health service in Canada, so you don’t charge HST on patient care as a sole proprietor and you won’t as a corporation. The flip side carries over too: the exempt side gets no input tax credits, and any taxable work you do, like insurer assessments or medico-legal reports, is still taxable in corporate hands.
It also won’t shield your clinical work. A corporation can stand between you and ordinary business debts, but responsibility for the care you personally provide stays with you, which is what your professional liability insurance is for. Incorporate for the tax and cash-flow mechanics, not for protection from your own treatment decisions.
And it isn’t free to run. You’ll pay for the setup and the College’s certificate up front, then an annual renewal and a corporate tax return every year after, plus a second set of books. That overhead is fine when the deferral is working. It stings when it isn’t.
Common questions
Can my spouse own shares in my physiotherapy corporation?
No. Only physiotherapists registered with the College can hold shares or serve as officers and directors. A reasonable salary for actual work is the only family-income option left, and the CRA does check that the pay matches the job.
Once I incorporate, do I take salary or dividends?
Usually a mix, revisited each year based on what you’re leaving in the company and your RRSP and CPP picture. We walk through the trade-off in salary versus dividends for a health practice.
Who should run the numbers before I commit?
An accountant for physiotherapists who sees these corporations year-round can tell you in one meeting whether the deferral covers the overhead. Our physiotherapist accounting page covers what that looks like with us.
On the fence about incorporating? Send us your numbers and we’ll give you a straight answer.