If you’re a dentist or medical professional building your own practice, you’ve probably heard this advice:
“You should incorporate. Everyone does it.”
Sometimes that’s right. Sometimes it’s a waste of money and an unwanted hassle.
The key point: incorporation is most valuable when it supports a clear plan, especially around tax deferral, practice growth, and how you pay yourself.
The decision isn’t “Can I incorporate?” It’s “Will it actually help me?”
A corporation is a separate legal entity (a separate “person” for legal and tax purposes).
That separation can create planning opportunities, but only if your cash flow and goals make space for them.
For dentists and medical professionals, the most common reason to incorporate is:
You’re earning more than you need personally, and you want to leave some profit inside the company.
Why many dentists and medical professionals incorporate
1) Tax deferral (usually the main benefit)
Tax deferral means you may pay less personal tax today by not pulling every dollar out of the business immediately.
Instead, you leave some profit in the corporation to use for things like:
- building cash reserves (for equipment, expansions, renovations)
- paying down practice loans faster
- funding a second location, associates, or an acquisition
- investing inside the corporation (with planning – more on this later)
This is not the same as “permanent tax savings.” Most owners eventually pay personal tax when they withdraw funds. The value is timing and flexibility.
2) More flexibility in how you pay yourself
Incorporation can give you options to pay yourself through:
- salary (payroll; creates RRSP contribution room)
- dividends (no RRSP room; different tax mechanics)
- a mix of both
The “right” mix depends on your goals (mortgage qualification, RRSP strategy, cash flow stability, parental leave, etc.). There’s no universal best answer.
3) Cleaner long-term planning
With the right structure and bookkeeping discipline, incorporation can support:
- more deliberate savings and investment planning
- compensation planning over multiple years
- clearer separation of business and personal spending
What incorporation will NOT do
Incorporation does not automatically protect you from malpractice
A professional corporation can be useful for business planning, but it generally does not shield you from professional negligence. In Ontario (for example), medical professionals still need proper professional liability protection and risk management.
Incorporation does not guarantee you “save tax”
If you withdraw basically everything to fund your lifestyle, the corporation may not create meaningful value, because you’ll still pay personal tax when you take the money out.
The “timing” question: when incorporation tends to work best
Incorporation often starts to make sense when most of the following are true:
- You consistently earn more than you spend personally (so you can leave money inside the corporation).
- You’re planning growth: bigger buildout, more chairs, equipment, hiring, marketing, expansion.
- You want a deliberate plan for debt paydown + retained earnings (money left in the company).
- You’re ready for the admin: corporate filings, payroll/dividend paperwork, separate bank accounts, etc.
Incorporation may be premature when:
- every dollar needs to come out to cover living costs, debt, and taxes
- your practice cash flow is still unstable
- you’re not ready to maintain corporate discipline (separate spending, proper records)
Common mistakes that erase the benefit
Mistake 1: Thinking “incorporated = tax savings” (instead of tax deferral)
If you take all the profit out personally anyway, you may not get much benefit beyond flexibility and planning structure.
Mistake 2: Setting up the structure with no long-term plan
Incorporation is not just paperwork. The value shows up when you use it to support:
- retained earnings strategy
- compensation strategy
- tax planning over multiple years
Mistake 3: Treating salary vs dividends like a one-time decision
Dentists’ income changes year-to-year (collections, associate costs, hygiene expansion, equipment cycles). Your compensation plan should be reviewed annually.
Mistake 4: Ignoring passive investment income inside the corporation
Once you start building investments inside the corporation, you need to understand a key rule:
If your corporation (and any associated corporations) earns too much Investment Income, your $500,000 small business limit can be ground down. The grind starts at $50,000 of AAII and can eliminate the business limit at $150,000.
This doesn’t mean “don’t invest in the corporation.” It means you should invest with a plan.
Mistake 5: Assuming you can freely pay dividends to family
Canada has TOSI (Tax on Split Income) rules that can apply to certain dividends (and other amounts) paid to family members from a related business. If you’re planning any family-shareholder strategy, this must be reviewed carefully.
Quick decision framework for building a practice
Ask yourself these five questions:
- Do I reliably have surplus cash after tax and living costs?
If no, incorporation may not create much value yet. - What is the surplus for?
Expansion? Faster debt payoff? A second location? Investing? - Do I need cleaner separation of business and personal spending?
A corporation forces discipline, if you run it properly. - Am I ready for the admin and ongoing compliance costs?
Annual corporate tax return (T2), minutes/resolutions, payroll/T4 if salary, T5 if dividends, etc. - Do I have a compensation plan that matches my goals?
RRSP room, mortgage, parental leave, cash flow stability, long-term investing.
Table: “Incorporate now” vs “Wait for now”
| Signal | What it usually means | Direction |
|---|---|---|
| You consistently keep surplus cash after paying yourself | You can use a corporation for tax deferral and a retained earnings plan (growth, debt paydown, future acquisition). | Incorporate now |
| You withdraw almost everything to cover lifestyle and taxes | Incorporation may add complexity without much tax benefit (because little is left to defer). | Wait for now |
| Major expansion planned (buildout, tech, hiring, second op) | Tax deferral + better cash management can support growth and financing strategy. | Incorporate now |
| You want to invest inside the corporation soon | Doable, but you need a plan for passive income (AAII) because it can reduce the small business limit. | Incorporate now (with planning) |
FAQs
Do Ontario medical professionals automatically save tax by incorporating?
Not automatically. The most common benefit is tax deferral if you can leave profit inside the corporation instead of withdrawing it all personally.
When should a medical professional incorporate?
Often when you’re consistently earning more than you need personally and you want to retain earnings for growth, debt paydown, or long-term planning.
Can I bill through my professional corporation right away?
Not necessarily. If you’re using a Professional Corporation, you generally need the College’s certificate of authorization before running dental fees through it.
Does incorporation protect me from malpractice claims?
Generally, no. Professional negligence is not “fixed” by incorporating. Ensure your professional liability coverage and risk management are strong.
Can I invest inside my dental corporation?
Yes, but invest with planning. If corporate passive income (AAII) gets high enough, it can reduce your access to the small business limit. This may also hinder claiming lifetime capital gains exemption if you sell the practice as a share sale.
Can I pay dividends to my spouse or adult kids?
Sometimes, but TOSI can apply in certain situations, which can result in high tax on “split income.” Get this reviewed before implementing any family-share strategy.
Final Takeaway
Incorporation can be one of the strongest financial tools available to medical professionals, but it works best when it matches your stage of ownership and your plan for surplus cash. If you’re still pulling out everything you earn, it may be too early. If you’re building a practice and starting to create consistent surplus, incorporation can unlock real flexibility, especially around retained earnings, compensation planning, and long-term growth.
If you’re considering a Dental or Medical Professional Corporation (or you already have one and you’re not sure you’re using it efficiently), Think Accounting can help you pressure-test the timing, set up the right structure, and build a compensation + retained earnings plan that fits your goals as a practice owner. Reach out via the contact link below.
