The timing test: profit you do not need to spend
A corporation earns its keep through deferral: profit left inside is taxed at roughly 12.2% on the first $500,000 in Ontario instead of your personal marginal rate. That only helps if money actually stays inside, funding inventory and growth. An owner who withdraws every dollar to live on gets little from the structure except accounting fees and a T2.
So the test is practical. If the store clears more than your cost of living, if reorders keep getting bigger, or if a wholesale buyer or brand acquirer is somewhere on the horizon, the corporation starts paying for itself. In the loss-making launch years the sole prop is often better, because a T2125 loss offsets salary from a day job while a corporate loss just waits. Our Incorporation engagement starts by checking which side of that line you are on, and says so plainly if the answer is not yet.
Liability is not theoretical when you import products
An e-commerce seller is usually the importer of record and often the first name on the product itself. If a phone charger overheats or a supplement is mislabelled, the claim lands on the seller, not the overseas factory. A corporation puts a wall between that risk and your house; a sole proprietorship does not.
The corporation is a shield, not a substitute for product liability insurance, and it does nothing about the other existential seller risk, a platform suspension. But for a business built on goods you did not manufacture, sold at volume to strangers, limited liability is a real reason to incorporate earlier than the tax math alone would say.
The switch: new numbers, platform re-verification, one clean rollover
Incorporating is not a name change. The corporation is a new taxpayer with its own business number and its own GST/HST registration; your sole-prop tax numbers do not carry over, and checkout tax settings have to be updated to the new registration. The assets of the store move in via a section 85 rollover, which transfers inventory, the brand and the domain into the corporation without triggering tax on the way in, provided the election is filed properly.
Then come the platforms. Shopify, Amazon and the payment processors all need the new legal entity, banking and tax details, and marketplaces typically re-verify the account when the entity changes, sometimes with a payout hold while they do. Plan the switch for a quiet month, never the Q4 run-up. Suppliers, freight forwarders and the customs broker follow, so the corporation, not you personally, is the importer of record going forward.
What changes at tax time
| Question | Sole proprietor | Corporation |
|---|---|---|
| Tax on profit | Personal rates up to about 53.5% | About 12.2% on the first $500,000 of active profit |
| Early losses | Deduct against other personal income | Stay in the corporation for future years |
| Liability for product claims | Personal assets exposed | Contained in the corporation, insurance still essential |
| Filings | T1 with a T2125 | T2, corporate records and separate HST account |
| Year-end | December 31, always | Your choice, within 53 weeks of incorporating |
| Selling the business | Asset sale, fully taxable | Share sale may access the $1.25M lifetime capital gains exemption |
Pick a year-end the warehouse likes
A corporation chooses its fiscal year-end, and sellers should not default to December 31. An end of January or February lets the holiday peak and its returns wave settle inside one fiscal year, and puts the inventory count at the moment shelves are emptiest. It also moves your year-end accounting into the quietest weeks of the seller calendar instead of the busiest.
The endgame deserves a thought on day one as well. Brand acquirers buy corporations, and the lifetime capital gains exemption on a share sale is only available if the corporation stays clean enough to qualify, which is easier to maintain from the start than to repair later. We set up the structure, the rollover and the registrations as one quoted, fixed-fee project, and Tax Planning & Advisory takes over from there. A seller still a year away from any of this can keep the question on a professional's desk for $99 a month through CPA Quick Support.
