You're netting about $150,000 a year as a sole proprietor. Someone at a dinner party told you that you're "leaving money on the table" by not incorporating. Your bank keeps suggesting it. And every article you find quotes a corporate tax rate somewhere around 12% next to a personal rate somewhere north of 45%, which makes the decision look obvious.
It isn't obvious. At $150,000 the answer is genuinely close, and it hinges on a single number: how much of that $150,000 you don't need to spend. Below we run the actual arithmetic for Ontario and Quebec, find the break-even, and flag the Quebec rule that quietly costs solo owners thousands a year.
- The deciding number is retained profit, not revenue. If you spend all $150,000, incorporating changes your lifetime tax bill by almost nothing (that's integration) and adds $2,000–$4,000 a year of compliance cost. Stay a sole proprietor.
- The break-even is roughly $10,000–$12,000 of profit left in the company each year, and only if it stays there. Below that, the corporation costs more than it returns.
- Reinvestment is where the real gain is. $10,000 of pre-tax profit buys $8,780 of equipment inside an Ontario corporation versus $5,659 in a sole proprietorship: a 55% bigger budget, this year.
- Parking cash to invest passively is the weak case. Corporate passive investment income is taxed above 50%, so the compounding advantage of deferral is much smaller than the headline rate gap suggests.
- Quebec owners: you probably don't get the small business rate. Quebec's SBD requires 5,500 paid hours. One full-time owner maxes out at 2,080, so a solo corporation pays 20.5%, not 11.2%.
- Two things can make incorporating actively harmful: being a personal services business, and taking dividends only, which quietly zeroes your RRSP room and CPP/QPP accrual.
Read on for the sole-proprietor baseline, the corporate comparison, where the break-even actually sits, and the Quebec wrinkle.
What a sole proprietor actually pays at $150,000
Before you can judge the corporation, you need an honest starting point. A sole proprietor pays personal tax on every dollar of net business income, plus the full CPP or QPP contribution: both the employee and employer halves, because you are both.
For 2026, the maximum pensionable earnings are $74,600, with a second tier running up to $85,000 and a $3,500 basic exemption. At $150,000 you are well past both ceilings, so you pay the maximum: $9,292.90 of CPP outside Quebec, or $9,790.60 of QPP inside it, plus a QPIP premium of $786.92 in Quebec.
Source: CRA, CPP contribution rates, maximums and exemptions (2026: YMPE $74,600, YAMPE $85,000, self-employed base rate 11.90% plus 8.00% on second-tier earnings); Revenu Québec, QPP contribution payable by a self-employed person.
Ontario
Quebec
Two things to hold onto. First, that marginal rate: 43.41% in Ontario, 47.46% in Quebec. It's the rate that applies to the last slice of income, and it is the number the corporation competes against. Second, the CPP/QPP bill of roughly $9,300–$9,800 is not a tax you can plan away as a sole proprietor. It becomes optional the moment you incorporate, which turns out to be a double-edged benefit.
What changes when you incorporate
A Canadian-controlled private corporation claiming the small business deduction pays a combined federal-provincial rate of about 12.2% in Ontario on its first $500,000 of active business income. The gap against your 43.41% marginal rate looks enormous, and it is: 31 percentage points.
Source: Income Tax Act (Canada), section 125 (the small business deduction, active business income, and the $500,000 business limit); CRA, Corporation tax rates.
But that gap only applies to profit you leave in the company. Money you pay out to live on is deducted from corporate income (if it's salary) or paid from after-tax corporate income (if it's a dividend), and then taxed in your hands. So the real comparison is between two slices, not two rates.
Say the business nets $150,000 before paying you, and you can live on $95,000:
Inside the corporation
The same slice as a sole proprietor
Fifteen thousand dollars a year. That is the number people mean when they say incorporating saves tax. It is also the number that gets misread, so be precise about what it is: $15,716 of deferred tax, not $15,716 of saved tax. When that money eventually leaves the company as a dividend, you pay the personal layer then. Canada's integration system is designed so the two layers together land close to what you'd have paid personally in the first place.
So what is the deferral actually worth?
Deferral is worth a lot, or almost nothing, depending on what you do with it
Three different owners can retain the same $15,716 and get three very different outcomes.
If you reinvest it in the business, the gain is immediate and real. This is the strongest case at $150,000 and the one that gets the least attention. Every dollar of profit you put into equipment, inventory, software, or a hire is spent with pre-personal-tax dollars inside a corporation. As a sole proprietor, growth capital has to survive your marginal rate first.
If you park it to invest passively, the gain shrinks sharply. Investment income earned inside a corporation is taxed at roughly 50% before the refundable mechanism unwinds, and earning more than $50,000 of passive income begins grinding away your small business limit entirely. You still start with more capital, but it compounds at a worse rate. Over a short horizon the extra compliance cost can eat the whole advantage.
Source: Income Tax Act (Canada), subsection 125(5.1) (reduction of the business limit where adjusted aggregate investment income exceeds $50,000). See also The Passive Income Trap.
If you'll draw it out in a lower-income year, the gain becomes permanent. This is the quiet one. A corporation lets you smooth income across good years and bad, or into retirement. Retaining profit at 12.2% in a $150,000 year and drawing it as a dividend in a $60,000 year isn't deferral: it's genuine rate arbitrage, and for a business with lumpy revenue it can be worth more than everything else combined.
How much do you need to leave in?
Running a corporation costs money that a sole proprietorship doesn't: a T2 corporate return (plus a CO-17 in Quebec), corporate-standard bookkeeping, payroll registration and remittances if you take a salary, annual corporate filings, and the incorporation itself. For a straightforward owner-managed company, budget $2,000 to $4,000 a year.
Set that against the tax deferred per $10,000 you retain:
| Situation | Rate gap | Deferred per $10,000 retained |
|---|---|---|
| Ontario, small business rate | 43.41% − 12.2% | $3,121 |
| Quebec, small business rate (3+ employees) | 47.46% − 11.2% | $3,626 |
| Quebec, solo owner (no provincial SBD) | 47.46% − 20.5% | $2,696 |
At roughly $3,000 of annual cost, the break-even sits near $10,000–$12,000 of profit retained per year. Retain less and the corporation is a net loss. Retain $50,000 and it's clearly worth it.
But apply the honest test from the previous section before you trust that line. If the retained money is going into equipment or a hire, break-even arrives at the first dollar. If it's going into a corporate investment account you'll drain in eighteen months, you need to retain considerably more than $12,000 for the deferral to beat the fees.
The 5,500-hour rule most articles skip
Here is the part that surprises people. Quebec attaches a payroll condition to its small business deduction that the federal rules don't have. To claim the provincial SBD at the full rate, a corporation outside the primary and manufacturing sectors must have paid for at least 5,500 hours of work in the year. Between 5,000 and 5,500 hours the deduction is reduced on a straight line. Below 5,000 hours, it's gone.
Crucially, each person counts for a maximum of 40 hours a week. A single owner working full time contributes at most 2,080 hours. You cannot reach 5,500 hours without roughly three full-time people on payroll, and subcontractors don't count.
So the Quebec solo consultant who incorporates expecting 11.2% pays 9% federal plus 11.5% provincial: 20.5% combined. On our $150,000 example, that's about $4,460 a year more corporate tax than the small-business rate would have produced.
Source: Revenu Québec, form CO-771.CH (election concerning the number of employee remunerated hours for the SBD); Ministère des Finances du Québec, Information Bulletin 2026-3 and Revenu Québec, Increase in the Small Business Deduction Rate (for taxation years beginning after April 29, 2026, the Quebec rate on SBD-eligible income falls from 3.2% to 2.2%).
Note what that rate cut did: by lowering the Quebec small business rate to 2.2%, it widened the penalty for not qualifying from 8.3 points to 9.3. The gap between a Quebec corporation with staff and one without has never been larger.
There is a genuine consolation, and your accountant should raise it. Income taxed at the general rate builds your general rate income pool (GRIP), which lets the corporation pay eligible dividends. Those carry a much more generous dividend tax credit than the non-eligible dividends an SBD-claiming company pays. You defer less along the way, but the eventual payout is taxed more gently. It softens the blow; it doesn't erase it.
Quebec adds two other costs a salary triggers: the Health Services Fund contribution at 1.65% of payroll for employers under $1M in total payroll, plus the labour standards levy. On a $95,000 salary that's roughly another $1,600.
Source: Revenu Québec, Total payroll threshold and health services fund contribution rate.
Dividends skip CPP, and that isn't free
Incorporating gives you a choice a sole proprietor doesn't have: pay yourself in dividends and you owe no CPP or QPP at all. On our numbers that's $9,293 in Ontario or $9,790 in Quebec that simply stops leaving your account. It's the single largest immediate cash-flow change from incorporating, and it's why dividend-only compensation looks so attractive on a spreadsheet.
What it costs you is easy to miss because nothing arrives in the mail:
- RRSP room stops accruing. Dividends are not earned income. $150,000 of self-employment income generates $27,000 of RRSP room for the following year; a dividends-only year generates zero.
- Your CPP/QPP pension stops growing. Every dividend-only year is a zero-contribution year in the benefit calculation, permanently.
- You lose a deduction. The employer half of CPP is deductible to the payer, and salary itself is fully deductible to the corporation.
Neither answer is universally right, and most owner-managers end up with a mix. But treat "I'll just take dividends and skip CPP" as a funding decision, not a tax win. Our salary vs. dividend article works the comparison in detail, and how to pay yourself covers the mechanics.
When incorporating at $150,000 makes things worse
You'd be a personal services business. If you bill through a corporation but function like an employee of your single client (they set your hours, supply your tools, direct your work), the CRA can treat your company as a personal services business. A PSB loses the small business deduction and the general rate reduction, faces a punitive federal rate, and can deduct almost nothing beyond your own salary. This is a live risk at exactly the $150,000 one-big-client profile.
Source: Income Tax Act (Canada), subsection 125(7) (definition of "personal services business") and paragraph 18(1)(p) (restricted deductions); Revenu Québec, Special rules for corporations carrying on a personal services business.
You're counting on income splitting. Paying dividends to a spouse used to be a straightforward way to cut the household bill. The tax on split income (TOSI) rules now tax dividends paid to family members who aren't genuinely engaged in the business at the top marginal rate, wiping out the benefit. Splitting still works in specific circumstances, but "I'll put my spouse on the shares" is not a plan.
Source: Income Tax Act (Canada), section 120.4 (tax on split income and its exclusions). See Income Splitting and TOSI.
Marc-André budgeted for 11%, and got a bill for 20.5%
Marc-André is an industrial designer in Longueuil. He works alone, bills about $150,000 a year, and reinvests heavily: prototyping equipment, a 3D printer, CAD licences, roughly $45,000 a year back into the studio.
Incorporating was the right call for him. The reinvestment case is exactly the strong one: at 20.5% inside the corporation, his $45,000 of pre-tax profit buys about $35,800 of equipment, where as a sole proprietor at 47.46% it would have bought $23,600. That's a difference of more than $12,000 of capital equipment, every year.
What went wrong was the budget. Marc-André had read three articles about incorporating, all of them Canada-wide, all of them quoting a small business rate near 11%. He set aside about $5,000 for corporate tax. His first CO-17 came back at 20.5%, because a one-person studio pays for 2,080 hours of work and Quebec wants 5,500. The bill was closer to $9,500. He covered it by delaying a planned equipment purchase by two quarters.
What should have happened: run the hours test before incorporating, not after. Marc-André's real corporate rate was always going to be 20.5%, and his break-even and instalment schedule should have been built on that from day one. He'd also have learned the upside: because his income is taxed at the general rate, his company builds GRIP, so when he eventually pays himself dividends they can be eligible dividends at the lower personal rate. Same decision, correct expectations, no cash-flow scramble.
So, at $150,000: incorporate or not?
Incorporate if you're reinvesting meaningful profit into the business, your income is lumpy enough that smoothing it across years matters, you need limited liability, or you can consistently leave more than about $12,000 a year in the company and keep it there.
Stay a sole proprietor if you spend essentially everything you earn, your income is stable and fully consumed, or your only plan for retained profit is a corporate investment account you'll drain within a couple of years. You'd be buying a T2 return to capture a benefit you aren't positioned to use.
Get advice first if you have one dominant client (the PSB question), you're in Quebec and working alone (the 20.5% question), or you're incorporating primarily to split income with a spouse (the TOSI question). Each of these can flip the answer.
At $150,000 you are close enough to the line that the generic advice is worth exactly what you paid for it. The decision takes about twenty minutes of arithmetic against your actual numbers, and it's arithmetic worth doing before you file the articles, not after.
Want to know which side of the line you're on?
Bring your net income and roughly what you need to live on. A 15-minute call is usually enough to tell you whether incorporating would help you or just add a tax return, and what your real corporate rate would be.
Book a Free 15-Minute CallThis article is for informational purposes only and does not constitute tax or legal advice. All figures are illustrative and current as of August 2026; corporate and personal tax rates, contribution ceilings, and provincial rules vary by province and change frequently. The worked examples assume only the basic personal amount and ignore RRSP contributions, other credits, and provincial variations outside Ontario and Quebec. Consult a qualified professional before incorporating.
Primary sources, linked so you can read and interpret them yourself. Legislative links open on the official Justice Laws Website; agency links open on Government of Canada and Government of Quebec websites.
- Income Tax Act (Canada), Justice Laws Website: section 125 (the small business deduction, active business income, the $500,000 business limit, the passive-income grind in subsection 125(5.1), and the definition of "personal services business" in subsection 125(7)); paragraph 18(1)(p) (deductions denied to a personal services business); section 120.4 (tax on split income)
- CRA: Corporation tax rates (federal and provincial small-business and general rates)
- CRA: CPP contribution rates, maximums and exemptions (2026 YMPE, YAMPE, and self-employed rates)
- Revenu Québec: QPP contribution payable by a self-employed person
- Revenu Québec: Increase in the Small Business Deduction Rate and Ministère des Finances du Québec, Information Bulletin 2026-3 (SBD rate change effective for taxation years beginning after April 29, 2026)
- Revenu Québec: Form CO-771.CH (election concerning employee remunerated hours for the small business deduction: the 5,500-hour criterion)
- Revenu Québec: Total payroll threshold and health services fund contribution rate
- Revenu Québec: Special rules for corporations carrying on a personal services business
- Related reading: Should You Incorporate? (why the low rate is a deferral, not a saving), Salary vs. Dividend, The Passive Income Trap, Employee or Contractor?, and Your First Year Incorporated
Rodney Maiato is the founder of CDL Accounting Solutions, a remote bookkeeping practice helping Canadian incorporated small businesses keep clean, audit-ready books without the year-end scramble. He brings 15+ years in accounting (from junior accountant to assistant controller, where he managed a team of 7 and oversaw the books of 25+ companies, plus payroll for 100+ employees across several provinces) and is a Payroll Compliance Professional (PCP) Candidate with the National Payroll Institute. He also builds the automation behind CDL, including its text-in receipt intake system.