Sole Prop vs Incorporation: When the Switch Actually Pays
Somewhere around the second or third good year, almost every Canadian freelancer hears the same advice at a barbecue: "You should incorporate — you'll pay way less tax." Sometimes that's true. More often it's a half-truth that ignores the one variable that actually decides the question: whether you leave money inside the company. Incorporation's headline benefit is a low corporate tax rate, but that rate only helps on income you don't take out — and the compliance costs are real and annual. This guide walks through how each structure is taxed, the worked math for a spender versus a saver, the costs, the liability picture, and a decision framework you can bring to an accountant.
How a Sole Proprietorship Is Taxed
A sole proprietorship isn't a separate thing from you. Its net income — revenue minus expenses, calculated on Form T2125 — lands directly on your personal T1 return and is taxed at your personal marginal rates, stacked on top of any other income you have. In Ontario, combined federal-provincial marginal rates run from roughly 20% at modest incomes to approximately 53.5% at the top bracket.
On top of income tax, you pay both halves of CPP — roughly 11.9% of net self-employment income up to the annual maximum (about $7,700+ per year when you max out), as covered in our self-employed taxes guide.
What you get in exchange is radical simplicity: one tax return, no separate legal entity, business losses that offset your other personal income, and the cheapest possible compliance. For most freelancers in their first years, this is the right structure almost by default.
How a Corporation Is Taxed
A corporation is a separate legal person. It files its own T2 corporate return, owns its own money, and pays its own tax. For a Canadian-controlled private corporation (CCPC), the small business deduction taxes the first $500,000 of active business income at a low rate — approximately 9% federally plus a provincial small-business rate, landing around 11–13% combined in most provinces (verify your province's current rate).
Here's the part the barbecue advice skips: that ~12% is not your tax rate. It's the corporation's tax rate. The money still belongs to the corporation, and when you move it to your personal hands — as salary or dividends — you pay personal tax at that point. The Canadian system is deliberately designed around integration: if every dollar the corporation earns is paid out to you in the same year, the combined corporate-plus-personal tax ends up roughly equal to what you'd have paid as a sole proprietor. Not exactly equal — small frictions cut both ways by province — but close enough that flow-through income is not where the advantage lives.
The Real Advantage: Deferral on Retained Earnings
The genuine, structural tax advantage of incorporating is deferral — and it only exists on money you leave inside the corporation.
Income the corporation retains is taxed once, at approximately 11–13%, and the after-tax remainder can be invested by the corporation until you eventually withdraw it (paying personal tax then). Compare that to a sole proprietor at a 45–50% marginal rate: the same retained dollar loses nearly half to tax immediately. The corporation lets you invest the deferred portion for years before the second layer of tax applies.
Worked Example: The Spender vs the Saver
| Freelancer A — earns $80k, spends it all | Freelancer B — earns $180k, lives on $120k | |
|---|---|---|
| As sole proprietor | All $80k taxed personally (~$18–20k tax + CPP in Ontario, approximate) | All $180k taxed personally; the last $60k at ~45–48% marginal ≈ $27–29k tax on that slice |
| Incorporated | Needs the full $80k personally → nearly all flows out as salary/dividends → roughly the same total tax, minus ~$2,000–3,000/yr in new compliance costs. Worse off. | Pays out ~$120k, retains $60k taxed at ~12% ≈ $7,200 → roughly $20,000+ of tax deferred per year, invested inside the corporation until withdrawal |
These numbers are deliberately approximate — the pattern is the point. If your lifestyle consumes everything you bill, incorporation gives you paperwork, not savings. If you consistently earn well beyond what you spend, deferral compounds year after year.
Salary vs Dividends, Briefly
When you do pay yourself, salary is deductible to the corporation, creates RRSP room, and triggers CPP (both the employer and employee shares, paid via a payroll account). Dividends skip CPP and payroll administration but come from after-corporate-tax profits and build no RRSP room or CPP entitlement. Most owner-managers land on a blend, revisited annually with their accountant. One door that largely closed: paying dividends to lower-income family members ("income sprinkling") has been heavily restricted by the tax-on-split-income (TOSI) rules since 2018.
The Cost Side of the Ledger
A corporation is an ongoing administrative commitment, not a one-time form:
- Incorporating: roughly $200 for federal incorporation filed online (plus provincial registration), a few hundred more provincially, and $1,000–2,000+ if a lawyer sets up a custom share structure
- Annual accounting: a T2 corporate return with financial statements typically runs approximately $1,500–$3,000/year — compare that to $300–$800 for a sole proprietor's T1 with T2125
- Annual corporate filings: a small government annual-return fee, and minute-book upkeep
- New CRA accounts: the corporation is a new taxpayer — its own business number, corporate income tax account, its own GST/HST registration, and a payroll account if you take salary
- Banking and admin: a separate corporate bank account is effectively mandatory; invoices, contracts, and insurance move to the corporate legal name
Call it $2,000–$3,500 per year of recurring cost. That's the hurdle your deferral benefit has to clear before incorporation nets out positive.
Liability Protection — Real, but Narrower Than Advertised
Incorporation separates business obligations from your personal assets: if the corporation signs a lease or takes on a debt and fails, creditors generally claim against the corporation, not your house. That protection is real — and routinely narrower than people expect:
- Personal guarantees defeat it. Banks and landlords commonly require the owner of a small corporation to guarantee its obligations personally — which puts you right back on the hook.
- Professional negligence stays personal. If your own work harms a client, incorporation doesn't shield you from liability for your own actions. Professional liability insurance matters under either structure.
- Director liabilities exist. Directors can be personally liable for certain corporate debts, notably unremitted payroll withholdings and GST/HST.
Two More Factors Worth Weighing
Selling Someday: The Lifetime Capital Gains Exemption
If you might one day sell the business itself, shares of a qualifying small business corporation can be eligible for the lifetime capital gains exemption — shelter in the rough neighbourhood of $1 million-plus of gain (the figure is indexed and has been the subject of recent changes; verify the current amount). A sole proprietorship has no shares to sell. This mostly matters for businesses with sellable value beyond the founder's own labour — consult an accountant well before any sale.
Losses Behave Differently
Sole-proprietorship losses offset your other personal income in the same year — genuinely useful in an early lean year alongside employment income. A corporation's losses are trapped inside the corporation, usable only against the corporation's own past or future profits.
A Decision Framework
| Your situation | Leaning |
|---|---|
| Net income under ~$100k, and you spend most of what you earn | Stay sole proprietor. Deferral has nothing to work with; costs exceed benefits. |
| Income well above living costs, consistently retaining $30k+/year | Run the incorporation math with an accountant. Deferral likely clears the cost hurdle. |
| Significant contract/debt exposure a corporation would actually absorb | Incorporation strengthens — but price in guarantees and get insured either way. |
| Plausible future sale of the business itself | Incorporation strengthens (LCGE) — plan early with a professional. |
| Expecting losses, or income is still unpredictable | Stay sole proprietor — losses offset your other income personally. |
If You Do Switch: What Changes Administratively
The corporation is a brand-new taxpayer, so the transition is a set of openings and closings: incorporate and register, get the corporation's business number and corporate tax account, open its GST/HST registration and — since your sole proprietorship's registration doesn't transfer — close your old GST/HST account properly, set up a payroll account if you'll take salary, open the corporate bank account, and file a final T2125 on your personal return for the sole-prop period. From then on it's a T2 for the corporation plus your personal T1, and your invoices bill from the corporate legal name.
Frequently Asked Questions
At what income should I incorporate?
There's no magic number — retention is the trigger, not revenue. If you reliably earn well beyond what you spend (commonly the case above ~$100k+ net), the deferral math is worth running. If you spend what you earn, incorporation mostly buys paperwork.
Does incorporating actually save tax?
Mostly it defers tax on retained earnings (taxed ~11–13% now instead of your marginal rate). Integration means fully-distributed income lands roughly where personal tax would have. Family income splitting is heavily restricted under TOSI.
Do I still pay CPP if incorporated?
Salary → yes, both employer and employee shares via a payroll account. Dividends → no CPP, but also no CPP retirement accrual and no RRSP room. Most owner-managers blend the two.
Can I switch back to a sole proprietorship later?
Yes, but dissolution involves final returns, account closures, and possible tax on assets leaving the corporation. Unwinding costs more than setting up — start simple, incorporate when the numbers justify it.
Do I need a lawyer to incorporate?
No — basic federal or provincial incorporation can be done online. A lawyer earns their fee when you want a share structure beyond the basic setup (family holdings, multiple classes, a partner) — which is also exactly when you want an accountant in the room.