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The biggest accounting difference is who owns the profit. A sole proprietorship isn’t separate from you, so its income lands on your personal return on form T2125. A corporation is its own legal entity with its own books, its own T2 return, and its own tax bill. Everything else, from payroll to payment dates, follows from that split.
How does a sole proprietorship compare with a corporation?
This table sticks to what the Canada Revenue Agency states about each one, using 2026 dates.
| Item | Sole proprietorship | Corporation |
|---|---|---|
| Legal status | Same as the owner | Separate legal entity |
| Income reported on | Owner’s personal return, form T2125 | T2 corporation return |
| Filing date | June 15 if self-employed | Six months after the year end |
| Tax payment | April 30, plus instalments if needed | Two to three months after the year end, or instalments |
| Liability for debts | The owner, directly | Limited for shareholders, but personal guarantees can override it |
What changes in the books themselves?
Start with the money. As a sole proprietor you can take cash out of the business whenever you like, and it doesn’t need a label in your records. You’re taxed on the profit, whether or not you spend it. A corporation is different. Money you take out has to be either salary, a dividend, a loan or a repayment, and each one is recorded differently.
That means a corporation needs its own bank account, and mixing personal spending into it creates a mess that an accountant has to untangle. A sole proprietor should keep the accounts separate too, but the tax rules won’t force it.
Corporations also carry things a sole proprietor doesn’t: share capital, retained earnings, a shareholder loan account, and year-end statements. We couldn’t confirm any legal rule that forces a small corporation onto one accounting method in place of another, so ask your accountant which method suits your situation.
How does the tax bill differ on the same profit?
Take $100,000 of profit in Ontario. As a sole proprietor, the self-employed tax calculator shows $19,044.97 of income tax and $9,292.90 of CPP for both halves. That’s $28,337.87, leaving $71,662.13.
Put the same profit in a corporation and the corporate tax calculator shows $11,696 of company tax on $100,000, an average of 11.7% for a calendar 2026 year. The corporation keeps $88,304.
Looks like an easy win for the corporation. It isn’t. The money is still in the company, and the moment you pay yourself, more tax follows. A dividend brings its own tax: on $10,000 of dividends in Ontario, the dividend tax calculator shows $788.97 of extra tax, though that figure is for eligible dividends and yours may be a different kind. Salary brings income tax and CPP. So the honest comparison is what’s left in your pocket, not what the company pays.
What does payroll look like for a corporation owner?
If you pay yourself a salary, you become an employee of your own company. That brings source deductions, remittances and a T4 slip due by the last day of February. The payroll remittance calculator shows the size of it for a single $3,000 pay in Ontario: $961.03 to remit, of which $228.41 is the employer share.
A sole proprietor doesn’t pay themselves a wage at all. Your draws aren’t a deduction, and you pay both halves of CPP on your net income.
Where do owners go wrong?
- Treating a corporation’s bank account as a personal wallet.
- Comparing only the company’s tax rate and forgetting the tax on the way out.
- Forgetting that the corporation’s balance is due before its return.
- Skipping records because a sole proprietorship “doesn’t need” them. The CRA expects six years of records either way.
Limited liability gets oversold. The CRA itself notes that a creditor may ask you to guarantee a loan personally, and directors can be personally liable for unpaid payroll remittances. So incorporating doesn’t make debts vanish.
Which one should you pick?
There’s no single answer, and the numbers above show why. If you spend most of what you earn, the corporation adds paperwork for little gain. If you leave a good part of the profit in the business, the lower company rate starts to matter. Either way, decide before the year starts, and ask for a comparison built on your real figures. It’s a fair question for an accountant, and one that a good one will welcome.
Where the numbers come from
Structure, filing and liability points come from the Canada Revenue Agency’s pages on sole proprietorships, corporations and 2026 business deadlines. Tax figures come from this site’s calculators, which use 2026 federal and Ontario data. The corporate rate is a prorated blend for a calendar 2026 year, because Ontario cut its small business rate on July 1, 2026.
Frequently asked questions
Which form does a sole proprietor use to report business income?
Form T2125, filed with the personal income tax return.
When is a corporation's T2 return due?
Within six months of the tax year end. The tax balance is generally due earlier.
Does a corporation always pay less tax?
No. The company may pay less, but paying yourself salary or dividends adds tax, so compare what you keep.
Do I still need records as a sole proprietor?
Yes. The CRA says to keep records for six years from the end of the last tax year they relate to.
Does incorporating remove personal liability?
Shareholders have limited liability, but creditors can ask for a personal guarantee, and directors can be liable for some unpaid remittances.
- Self-employed taxes in Canada: income, CPP and GST
How tax works when you are self-employed in Canada: reporting income and expenses, paying both halves of CPP, instalments and when to register for GST
Information only. This page is general information, not tax, legal or accounting advice. Tax-Services.ca is an independent publisher: we don't prepare or file tax returns or offer tax services, and we have no connection with the CRA, Revenu Québec, any government or any company named on this page. Check the figures that matter with an official source or a qualified professional.