Sole Proprietorship vs Incorporation in Canada: Which Saves More Tax?

Incorporation starts saving tax when your net business income passes roughly $75,000 to $80,000 per year. Below that, the administrative costs of running a corporation eat into whatever tax deferral you gain. The reason is the gap between personal marginal tax rates (up to 53.53% in Ontario) and the small business corporate rate of 12.2% on the first $500,000 of active business income.

At our firm, this is one of the most common questions we get from self-employed clients in Ottawa and Toronto. The answer depends on how much you earn, how much you need to take out of the business, and whether you plan to sell the business or invest inside it long-term.

This post compares the two structures at four income levels, explains the tax integration concept that most articles skip, and covers the real costs, benefits, and traps of each option.

How Sole Proprietors Are Taxed

All net business income flows directly onto your personal T1 return. There is no separate business tax filing. You report revenue and expenses on Form T2125 (Statement of Business or Professional Activities), and the net amount is added to your other income for the year. You pay personal income tax on the total at your marginal rate.

For the 2026 tax year, the combined federal and Ontario marginal rates are:

The sole proprietorship is simple. No corporate tax return, no articles of incorporation, no annual provincial filings. You register a business name with Service Ontario for about $60, and you are in business. Your accounting fees are lower because the only return you file is your personal T1 with the T2125 attached. For more on this topic, see our guide on incorporating rental properties.

You also pay both the employee and employer portions of CPP on your self-employment income. For 2026, that means contributions up to approximately $8,000 total (the combined employee and employer amounts on pensionable earnings up to the yearly maximum). This is a real cost, but it also builds your CPP pension entitlement.

If your gross revenue exceeds $30,000 over four consecutive calendar quarters, you must register for and collect HST. This applies regardless of business structure, so it is not a factor in the sole prop vs incorporation decision.

How Incorporated Businesses Are Taxed

A Canadian-controlled private corporation (CCPC) pays corporate income tax on its net income at rates that are significantly lower than personal rates. The combined federal and Ontario rate for active business income up to $500,000 is 12.2%. Above $500,000, the general corporate rate is approximately 26.5%.

That 12.2% rate on the first $500,000 is the small business deduction (SBD) at work. It is the primary reason business owners incorporate. On $100,000 of net income, a sole proprietor in Ontario might pay $30,000 to $35,000 in personal tax. A corporation pays $12,200, leaving $87,800 inside the company.

But that $87,800 is not in your pocket. It belongs to the corporation. To get it into your hands, you need to pay yourself a salary (which the corporation deducts, and you pay personal tax on) or a dividend (which comes from after-tax corporate income, and you pay personal tax on at the dividend rate). This is where the tax integration concept becomes important, and where the real savings picture gets more complicated than the headline rate suggests.

The corporation also files its own T2 corporate tax return each year. This requires financial statements prepared according to Canadian accounting standards. Most small business owners hire a CPA for this, and the cost is covered in our T2 guide.

Tax Comparison at Four Income Levels

The table below compares the total tax paid on net business income at four levels, assuming you are the sole owner, live in Ontario, and have no other income. The incorporated scenarios assume you pay yourself enough salary or dividends to cover your personal living expenses and leave the rest inside the corporation.

For the sole proprietor column, the figure is your personal income tax plus CPP contributions. For the incorporated column, the figure is corporate tax on all income plus personal tax on the amount you withdraw.

These are approximate figures using 2026 rates. The exact amounts depend on your personal credits, other income sources, and how you split salary and dividends.

At $50,000 of net income, the corporate tax rate is lower (12.2% vs your marginal rate of about 20-29%), but you need to take most of that money out to live on. After paying yourself, the tax savings are minimal, and the extra accounting fees ($1,500 to $3,500 per year for a T2 return) wipe out the difference.

At $80,000, the math starts working in favour of incorporating. The savings come from leaving $20,000 to $30,000 inside the corporation, where it is taxed at 12.2% instead of your personal marginal rate. The more you can leave inside the company, the larger the deferral.

At $120,000 and above, the gap widens because more income sits inside the corporation at the low rate. A business owner earning $200,000 who only needs $100,000 to live on can defer tax on $100,000 at 12.2% instead of paying 46% or more on that amount personally.

The general guideline we use: if your net business income is consistently above $75,000 to $80,000 and you do not need to withdraw all of it, incorporation is worth the conversation. Below that, the sole proprietorship is usually the better fit. If you are in that range and want to see the numbers for your specific situation, book a consultation with our team and we will run the comparison with your actual income and expenses.

The Tax Integration Concept

Incorporation defers tax. It does not eliminate it. This is the most misunderstood part of the decision.

Canada’s tax system is designed so that the total tax on income earned through a corporation and then paid out as a dividend roughly equals the tax you would have paid as a sole proprietor earning the same amount. This is called tax integration. The corporate tax paid by the company plus the personal dividend tax paid by the shareholder should add up to approximately the same total as the personal tax rate on that income.

In practice, integration is not perfect. There are small differences depending on the province, the type of dividend (eligible vs non-eligible), and the tax bracket. But the principle holds: the tax system tries to make the total tax the same regardless of structure.

The real benefit of incorporation is not a permanently lower tax rate. It is the ability to defer tax on income you do not need right now. If your business earns $150,000 and you only need $80,000 to live on, the remaining $70,000 sits in the corporation at 12.2% instead of being taxed immediately at your personal marginal rate of 37% to 46%. That $70,000 (minus the $8,540 in corporate tax) stays inside the company and can be invested, used for business expansion, or paid out in a future year when your income is lower.

If you take everything out every year, incorporation saves you little. The deferral advantage only works when you leave money inside the corporation.

Hidden Costs of Incorporation

The tax comparison tables do not account for the real costs of maintaining a corporation. These costs reduce the net benefit, and at lower income levels, they can eliminate it entirely.

Here is what you should budget for:

• Corporate tax return (T2) preparation: $1,500 to $3,500 per year for a simple CCPC. More complex situations with multiple shareholders, inter-company loans, or investment portfolios run higher.
• Legal fees to incorporate: $1,000 to $2,500 through a lawyer, or $300 to $800 through an online incorporation service. This is a one-time cost.
• Annual provincial return (Ontario Annual Return): $15.25 per year.
• Payroll administration: if you pay yourself a salary, you need to run payroll, remit source deductions (CPP, income tax), and file T4s. This costs $300 to $1,200 per year through a payroll service, or you can do it yourself through the CRA’s payroll calculator.
• Additional bookkeeping: corporate books need to be kept separately from personal finances. A bookkeeper costs $200 to $500 per month depending on transaction volume.
• Registered agent and minute book maintenance: most lawyers charge $200 to $500 per year to maintain your corporate records.

Add these up and a corporation costs roughly $3,000 to $6,000 more per year to operate than a sole proprietorship. At $50,000 in net business income, that overhead is a significant percentage of the tax savings. At $120,000, it is a manageable cost of doing business.

As a sole proprietor, your ongoing costs are your personal tax return (possibly with a T2125 attached), your bookkeeping, and an HST return if you are registered. Much simpler, much cheaper.

The Lifetime Capital Gains Exemption: $1,275,000

If you plan to sell your business someday, the lifetime capital gains exemption (LCGE) is one of the strongest reasons to incorporate. The LCGE allows you to shelter up to $1,275,000 of capital gains on the sale of qualifying small business corporation shares in 2026. This exemption is indexed to inflation and increases each year.

Sole proprietors cannot claim the LCGE because they do not hold shares. When a sole proprietor sells their business assets, the gain is taxed as regular capital gains or business income, with no special exemption. Incorporated business owners sell their shares, and if the shares meet the qualifying conditions (primarily that the corporation used at least 90% of its assets in active business in Canada at the time of sale), the gain up to $1,275,000 is tax-free.

On a $1,000,000 gain, the LCGE saves approximately $250,000 in tax (at the 50% inclusion rate and a marginal rate near 50%). That is a number that justifies years of higher administrative costs.

If you are building a business you intend to sell, even if the sale is a decade away, incorporation positions you to claim this exemption. You cannot retroactively incorporate and claim it on value that accrued while you were a sole proprietor (without a Section 85 rollover, and even then the timing matters).

Passive Income and the $50,000 Clawback

If you plan to invest retained earnings inside your corporation, the passive income rules are a factor you need to know about before you incorporate.

When a CCPC earns more than $50,000 per year in passive investment income (interest, dividends from public companies, capital gains on investments), the small business deduction begins to get clawed back. For every $1 of passive income above $50,000, $5 of the $500,000 small business limit is reduced. At $150,000 of passive income, the small business deduction is eliminated entirely. Your active business income above the reduced limit gets taxed at the general corporate rate of 26.5% instead of 12.2%.

This affects business owners who accumulate significant retained earnings and invest them in stocks, bonds, or GICs inside the corporation. If your investment portfolio is generating more than $50,000 per year in passive income, you are losing the benefit that made incorporation attractive in the first place.

The workaround is to pay out enough dividends to keep the investment portfolio below the threshold, or to use an individual pension plan (IPP) or other tax-sheltered strategies to reduce passive income. This is something we help incorporated clients plan for at Tohme Accounting, especially as retained earnings grow past the five-year mark.

For a business owner in the early years of incorporation, this is usually not an immediate concern. But it becomes relevant as the corporation accumulates five to ten years of retained earnings.

Section 85 Rollover: Converting from Sole Prop to Corporation

If you are currently a sole proprietor and decide to incorporate, you can transfer your business assets to the new corporation on a tax-deferred basis using a Section 85 rollover under ITA subsection 85(1).

Without the rollover, transferring assets to a corporation triggers a deemed disposition at fair market value. If your equipment, goodwill, or other assets have appreciated, you would owe capital gains tax on the transfer. The Section 85 election lets you set an “elected amount” between the asset’s cost and its fair market value. You defer the gain until the corporation eventually disposes of the asset.

The election requires filing Form T2057 with both the individual’s and the corporation’s tax returns. Getting the elected amounts right matters because errors can trigger immediate tax liability or create problems down the line. Our team handles Section 85 rollovers regularly for clients transitioning from sole proprietorship to corporation. We have a complete guide to Section 85 rollovers that walks through the process in detail.

The rollover is available for most business assets: equipment, vehicles, inventory, accounts receivable, goodwill, and land. Cash cannot be transferred under Section 85 (it has no cost basis to elect on).

One practical note: you do not have to use Section 85 if your assets have not appreciated. If your equipment is fully depreciated and your sole proprietorship has no goodwill to speak of, a simple asset sale to the corporation at book value may be cleaner. The rollover is most valuable when there is a significant unrealized gain.

When NOT to Incorporate

Incorporation is not the right move for every business. Here are the situations where staying as a sole proprietor makes more sense:

You earn under $50,000 to $60,000 net. The tax deferral at this income level is small, and the administrative costs of incorporation ($3,000 to $6,000 per year) eat into or exceed the savings. You are better off keeping things simple.

You need to withdraw all your business income. If you take out everything the business earns to cover personal expenses, there is nothing left inside the corporation to benefit from the low rate. Tax integration means you end up paying roughly the same total tax, but with higher accounting fees.

You are winding down. If you plan to retire or close the business within a few years, incorporating now creates extra administrative work and costs without enough time to build up tax-deferred savings. The LCGE is only valuable if there is a business to sell and a buyer to sell it to.

You run a side business alongside a full-time job. A side business earning $10,000 to $20,000 per year does not justify the cost of a separate T2 return, payroll, and corporate bookkeeping. Report it on your T2125 and revisit the question when the income grows.

Your business has no retained earnings. Service businesses with no employees and no equipment often have nothing to retain. A consultant who earns $90,000, spends $10,000 on expenses, and withdraws $80,000 gains little from incorporation because the deferral window is narrow.

We advise clients to look at the specific numbers, not the general rule. The $75,000 to $80,000 threshold is a starting point, not a guarantee. Your personal situation (other income, spousal income, retirement timeline, exit plans) changes the math. If you are weighing this decision, the small business tax deductions available under each structure are worth reviewing as well.