Should Dentists Incorporate? How to Know If the Timing Is Right

Yes. Most Canadian dentists earning above $200,000 who can leave $75,000 or more inside the corporation each year should incorporate. The tax deferral alone, depending on your province, saves between $27,000 and $34,000 annually. But timing matters. Incorporating too early (especially with unused tuition credits) or before your income supports meaningful retained earnings can actually cost you money in setup fees and added complexity for minimal benefit.

The rest of this article helps you figure out where you fall.

Key Takeaways

• A sole proprietor dentist earning $250,000 in Ontario pays a combined marginal rate above 49%. That same income inside a professional corporation is taxed at 12.2% on the first $500,000, and you only pay personal tax on what you withdraw.
• The commonly cited "$75,000 to $100,000 in retained earnings" threshold is not a CRA rule. It’s a practical cutoff based on whether the tax savings are large enough to justify the annual cost of running a corporation.
• New graduates sitting on $30,000+ in tuition tax credits should seriously consider waiting one to two years before incorporating, because those credits can only offset personal tax.
• Manitoba's combined corporate small business rate is 9% (the lowest in Canada), making the deferral math even more aggressive for dentists practising there.

What Does Your Financial Life Actually Look Like Right Now?

You finished school carrying six figures in debt. You got your licence, started working as an associate, and the money got better. Maybe a lot better. The Government of Canada Job Bank reports a national median of $110,000 for dentists, but that figure includes part-timers and new graduates. Full-time practice owners in major markets are making $200,000 to $300,000 without much trouble.

And you're depositing all of it into your personal bank account, reporting it on your T1, and watching close to half disappear to CRA before you've paid rent.

That's sole proprietorship. Every dollar your practice earns flows straight to your personal return and gets taxed at your marginal rate. At $250,000, that top marginal rate is roughly 49% in Manitoba, 50% in Ontario, 48% in Alberta. No shelter. No flexibility. No ability to choose when or how much to pay yourself. You earn it, CRA takes their cut immediately, and you invest whatever is left from the remains.

What Changes When You Incorporate?

A Dental Professional Corporation is a separate legal entity. Your practice bills through it, expenses flow through it, and the corporation pays tax on the net income at the federal small business rate of 9% plus whatever your province adds. Manitoba adds nothing, giving you a combined rate of 9%. Alberta and BC add 2%, for 11%. Ontario and Quebec add 3.2%, for 12.2%.

Canada's dental industry generates roughly $20 billion in annual revenue. A lot of that passes through professional corporations. Because after corporate tax, you decide how much to pay yourself through salary, dividends, or a blend. The surplus stays inside the corporation, growing at near-full value instead of being halved by personal tax first. That retained pool becomes the money you invest for retirement, fund an IPP with, or use toward buying a practice.

It also means more complexity. Two tax returns instead of one. Corporate bookkeeping. Running payroll for yourself. An RCDSO Certificate of Authorization in Ontario (or equivalent in your province) at $750 upfront and $175 per year to renew. Total annual overhead for accounting, bookkeeping, payroll, and regulatory fees runs $5,000 to $12,000. That cost needs to be justified by real savings.

Is Your Income High Enough for This to Make Sense?

The question isn't really about income. It's about what's left over after you pay yourself to live. If you earn $250,000 and your personal spending runs $150,000, you could retain $100,000 in the corporation. In Ontario, the tax deferral on that $100,000 is roughly $36,000. In Manitoba, closer to $40,000. That math works.

If you're an early-career associate earning $130,000 and spending most of it on rent, loan payments, and groceries, there's nothing to retain. The corporation would just be an expensive pass-through.

Should New Graduates Wait Before Incorporating?

Probably. Four years at a school like the University of Toronto, where domestic DDS tuition runs over $51,000 per year, generates around $200,000 in eligible tuition expenses. At the federal credit rate, that's roughly $30,000 in non-refundable tax credits plus another $10,000 or so provincially. Those credits carry forward indefinitely but can only reduce personal tax. A sole proprietor earning $200,000 can burn through most of them in a single filing year, paying near-zero federal tax on a full year's income.

An incorporated dentist paying themselves $80,000 in salary? Those credits trickle down over four or five years. The time value of $40,000 in immediate tax savings is real.

What Tax Planning Opens Up After You Incorporate?

Beyond the annual deferral, incorporation unlocks planning tools that sole proprietors simply cannot access.

You can structure salary to generate RRSP contribution room (18% of earned income, up to the 2026 ceiling of $33,810) while taking dividends for personal spending. Once you're over 40, an Individual Pension Plan can push annual tax-deductible contributions well past that RRSP cap. And when you eventually sell the practice, a share sale can qualify for the $1.275 million Lifetime Capital Gains Exemption, sheltering a massive portion of the proceeds from tax. None of that is available to you as a sole proprietor.

Two constraints worth knowing early. The TOSI (Tax on Split Income) rules are stricter for dental professional corporations than for typical small businesses. The "excluded shares" exemption that other CCPCs (Canadian-Controlled Private Corporation) use to pay dividends to family members does not apply to dentists. Your spouse needs to be genuinely working in the practice (20+ hours per week) or pass a "reasonable return" test. And if passive investment income inside the corporation exceeds $50,000 per year, the small business deduction starts getting clawed back at $5 for every $1 of excess.

How Do You Know When It's Time?

One signal matters more than the rest: you consistently earn more than you need to spend, and the surplus is getting taxed at your top marginal rate on the way to a savings account where it sits anyway. That's the moment. The money you'd keep in the corporation is money you weren't going to touch for years. Letting CRA take 50% of it now, when a corporate structure would take 9% to 12%, is the cost of waiting.

If you're a dentist anywhere in Canada trying to figure out when the math tips, we works with dental professionals on exactly this kind of decision. Reach out for a consultation.