When Should You Incorporate? A Plain-Language Guide

Incorporation is the most-discussed and most-misunderstood decision for self-employed Canadians. The right answer isn’t a revenue number - it’s whether the specific benefits of a corporation outweigh its specific costs for your situation. Many business owners incorporate too early, paying thousands in legal and accounting fees for benefits they can’t yet use.

Here’s the framework we run with clients before recommending it.

The four real reasons to incorporate

1. 01Tax deferral on retained earnings. You earn more than you need to live on, and the spread between the personal and corporate rate is real money.
2. 02Limited liability. Your business has meaningful exposure beyond your professional insurance.
3. 03Capital gains exemption planning. You intend to sell the business someday.
4. 04Income splitting and estate flexibility. Using family trusts or holding companies.

Reason 1: The Deferral Math

This is the primary economic driver. In Ontario, the combined small business tax rate is 12.2%. If you are in the top personal bracket, you pay 53.53% on your next dollar of income. By leaving money inside the corporation, you "defer" the 41.3% difference.

By incorporating, you have $74,000 more to buy equipment, pay down debt, or invest in stocks. If you spend every dollar the business makes, the deferral evaporates and you’re paying for a corporation with no economic benefit.

Reason 2: Limited Liability - When it actually matters

A corporation is a separate legal entity. Shareholder liability is generally limited to invested capital. However, "limited liability" has limits of its own:

• Personal Guarantees: Banks and landlords will almost always require you to personally guarantee the corporation’s debt.
• Director Liability: As a director, you are personally liable for unremitted HST, payroll source deductions, and WSIB premiums. The CRA can come after your personal house for these.
• Professional Negligence: Professional corporations (doctors, lawyers, accountants) usually do not provide liability protection for professional errors - that’s what malpractice insurance is for.

Reason 3: Building Toward a Sale (LCGE)

If you sell the shares of a "Qualified Small Business Corporation," you can shelter a massive amount of capital gain.

• 2026 LCGE Limit: ~$1,250,000+ (indexed for inflation).
• The Catch: You must have owned the shares for at least 24 months, and the company must meet specific "active asset" tests during that time.

Reason 4: Family Planning Levers

Once incorporated, you unlock sophisticated wealth-transfer tools:

• Holding Companies: Shielding surplus cash from creditors.
• Estate Freezes: Locking in the current value of the business for the founder and passing future growth to the children, potentially multiplying the LCGE.
• IPPs: Individual Pension Plans that allow for higher tax-deductible contributions than an RRSP.

The Real Costs of Compliance

Incorporation isn’t just a legal fee; it’s an annual administrative burden.

A Rough Decision Rule

If your business profit consistently exceeds your personal living needs by $75,000+/year, the tax deferral alone usually covers the cost of incorporation.

• Sole Proprietor: Best for businesses making <$100k or those spending all their profits.
• Corporation: Best for businesses with $150k+ in profit, those with employees/risk, or those planning for a future sale.

If you’re close to the line, the right answer is usually: build to the threshold as a sole proprietor, then incorporate once the math is decisive.