Sole Proprietorship vs. Corporation: What's the Difference, and Which One Are You?

Before you print a business card or buy your first tool for the job instead of the shop, there's a decision sitting underneath everything else you'll do: are you operating as a sole proprietor, or are you incorporating? Most new business owners have heard both terms and couldn't tell you the real difference if asked. That's not a knock — nobody teaches this in trade school, and it's not intuitive until someone walks you through it.

This isn't a legal or accounting deep-dive. It's the plain-language version: what each structure actually means for you, your liability, and your taxes — so that when you do sit down with a lawyer or accountant, you're asking the right questions instead of hearing the terms for the first time.

Sole Proprietorship: You and the Business Are the Same Thing

A sole proprietorship isn't really a "structure" at all — it's the default. If you start doing work for money and you haven't incorporated, you're a sole proprietor, whether you've filled out a form or not.

Legally, there's no separation between you and the business. That has two big implications:

• Liability. If the business owes money, gets sued, or can't pay a supplier, that's your debt and your lawsuit personally. Your house, your truck, your savings — all of it is exposed. There's no legal wall between "business you" and "personal you."
• Taxes. There's no separate business tax return. Your business income and expenses get reported directly on your own personal tax return — the same one you file every year — right alongside any other income you have. Your profit gets added to everything else you earned that year and taxed at your personal rate.

The upside is simplicity. There's no incorporation step, no separate corporate return, no minute book. If you're using your own legal name to operate, you can generally just start. If you want to operate under a business name (a "trade name") instead of your own name, you'll typically register that name provincially — but that's a registration, not a change in your legal status. You're still a sole proprietor underneath it.

Corporation: A Separate Legal Entity

Incorporating creates something new: a separate legal person. Not a metaphor — legally, the corporation is its own entity, distinct from you, with its own name, its own bank account, and its own tax return.

That separation is the whole point, and it cuts both ways:

• Liability. In most situations, if the corporation owes money or gets sued, that liability belongs to the corporation — not to you personally. This is often called the "corporate veil." It's real protection, but it isn't absolute. Directors can still be held personally liable for things like unremitted GST or unpaid source deductions, and most lenders will require a personal guarantee before extending credit to a new corporation anyway — so the protection is strongest against operational and contractual risk, not against every possible exposure.
• Taxes. The corporation files its own separate tax return and pays corporate tax on its profit — separate from anything you take out personally. For 2026, the combined federal and Alberta small business tax rate is 11% on the first $500,000 of profit the business makes in a year, and 23% on anything above that. You then decide how to pay yourself out of the corporation — salary, dividends, or a mix — and that personal income gets taxed again on your own return. This two-step (tax inside the corporation, then tax again on what you take out) is the trade-off for the liability protection and the planning flexibility a corporation gives you.

Incorporation also comes with more admin: articles of incorporation, an annual corporate return, a minute book, a separate business bank account, and — if you pay yourself a salary — payroll remittances. None of it is complicated once it's set up, but it's real ongoing work that a sole proprietorship doesn't require.

Quick Reference: Sole Proprietorship vs. Corporation

When Does the CRA Say Your Business "Started"?

This question matters more than most new business owners realize, because expenses incurred before your business commences aren't deductible as business losses — they just disappear. Expenses incurred after commencement generally are deductible. So the date your business "starts," in the CRA's eyes, has real dollars attached to it.

The CRA's guidance on this — Interpretation Bulletin IT-364 — doesn't give a single bright-line rule like "the day you get your business license" or "the day you invoice your first customer." Instead, the CRA looks at whether you've undertaken significant activity that's a regular part of earning income in that type of business, or an essential preliminary step toward normal operations — combined with a reasonably specific plan and enough of an organizational structure to actually carry it out.

Practically, for a trades business, that generally means the CRA is looking for things like:

• Buying materials, tools, or equipment specifically for the business — not just browsing options
• Advertising your services or actively pursuing work
• Taking concrete steps that only make sense if you're actually going into business — registering a name, opening a business bank account, getting quotes on insurance or bonding

What doesn't count, under the CRA's own language, is simply thinking about it — researching whether a business idea might work, without any serious or continuous effort to actually get it running. A business is treated as merely contemplated for the future if no serious or reasonably continuous efforts are being made to begin normal operations.

One more detail worth knowing: the commencement question is separate from — and just as relevant to — a sole proprietorship as it is to a corporation. Incorporating doesn't reset this clock or replace it. Whichever structure you choose, the same "did you actually start" test applies to when your expenses become deductible.

This Isn't a Decision to Make Alone

Once you've picked a structure, the next practical step is understanding which CRA accounts you actually need. Neither structure is universally "better." A lot of trades businesses start as sole proprietors and incorporate later, once there's enough income and risk on the table to justify the added cost and complexity. Others incorporate from day one because of bonding requirements, liability exposure, or how a specific GC or client wants to contract.

What matters is making the choice deliberately — with a lawyer for the legal side and an accountant or bookkeeper for the tax and record-keeping side — rather than defaulting into whichever one a buddy happened to choose.

This article is for general informational purposes only and does not constitute legal or tax advice. For guidance specific to your situation, consult a lawyer and a CPA or Canadian tax professional.