Why People Incorporate
The primary tax benefit of incorporation is tax deferral. Canadian Controlled Private Corporations (CCPCs) pay a combined federal-provincial tax rate of approximately 12-13% on the first $500,000 of active business income in Ontario — compared to a top personal marginal rate of over 53%. If you earn more than you need to live on, the excess stays in the corporation taxed at the lower rate until you take it out personally.
Other reasons to incorporate: limited liability protection, income splitting with a spouse or family member (subject to TOSI rules), access to the Lifetime Capital Gains Exemption on a qualifying business sale, and the ability to leave investment earnings inside the corporation.
The Compliance Cost
Incorporation comes with ongoing costs that don't exist as a sole proprietor:
- Annual T2 corporate tax return — typically $1,000-$2,500+
- Annual T1 personal return (more complex with salary/dividend decisions)
- Corporate minute book maintenance
- Potential bookkeeping costs
- Ontario annual return filing fee
- Payroll administration if paying salary
Realistically, the annual compliance cost of operating a corporation is $2,000-$5,000 depending on complexity. That's the hurdle your tax savings need to clear before incorporation makes financial sense.
The Break-Even Calculation
The general rule of thumb: incorporation makes financial sense when you have approximately $50,000-$80,000 of net business income that you don't need to live on in a given year.
Here's the simplified math in Ontario: On $60,000 of retained business income, a corporation pays roughly $7,800 in tax. As a sole proprietor at a 43% marginal rate, you'd pay roughly $25,800. The deferral is $18,000 — enough to comfortably cover compliance costs and leave meaningful savings.
Important: Tax deferral is not tax elimination. When you eventually take that retained income out of the corporation personally, you pay personal tax on it. The benefit is the time value of keeping more money invested inside the corporation at a lower rate — not a permanent reduction.
When Incorporation Doesn't Make Sense
- You need all your business income to cover personal living expenses — no deferral opportunity exists
- Your net income is consistently under $50,000
- Your business has losses — losses in a corporation can't offset personal income
- You're winding down or close to retirement
- Your business is high-risk and you rely on the limited liability but the financial benefit isn't there
The TOSI Rules — Income Splitting Isn't What It Used to Be
Pre-2018, many business owners incorporated specifically to pay dividends to family members at lower tax rates. The Tax on Split Income (TOSI) rules introduced in 2018 largely eliminated this for family members who don't actively work in the business. Don't incorporate with income splitting as your primary goal without understanding whether your family members would qualify for the exclusions.
What to Do Before You Incorporate
Get a proper analysis done — not a generic online calculator. The right answer depends on your province, your income level, your living expenses, your marginal rate, your growth trajectory, and your long-term plans. We model this for clients as part of our incorporation advisory engagement and give you a clear break-even timeline and recommendation.
This article is for general informational purposes. Tax rules change frequently and individual circumstances vary. Book a consultation for advice specific to your situation.