How Much Tax Do You Actually Owe as Self-Employed in Ontario?

Understanding Your Result

Why Self-Employed Tax Feels Higher

As a self-employed person in Ontario, you're responsible for both the employee and employer portions of CPP — that's 11.9% instead of the 5.95% an employee pays. On top of that, nothing is withheld at source. When you're an employee, your employer remits tax, CPP, and EI every pay period. When you're self-employed, you receive the full amount and owe it all at filing time.

CPP on Net Income, Not Gross

CPP contributions are calculated on your net self-employment income — your revenue minus deductible business expenses. This is different from employees, whose CPP is calculated on gross employment income before any deductions. If you have significant business expenses, your CPP obligation can be substantially lower than 11.9% of your gross revenue.

CPP1 vs. CPP2

CPP1 applies to earnings up to the Year's Maximum Pensionable Earnings (YMPE) of $74,600. CPP2 applies to earnings between $74,600 and the Year's Additional Maximum Pensionable Earnings (YAMPE) of $85,000. Both are calculated at the self-employed rate (both sides).

• CPP1: 11.9% on net SE income above $3,500, up to a maximum of $8,460.90
• CPP2: 8% on net SE income between $74,600 and $85,000, up to a maximum of $832.00
• CPP2 only applies if your net self-employment income exceeds the YMPE

Ontario Surtax

Ontario applies a surtax on higher provincial tax amounts. If your basic Ontario tax exceeds $5,818, a 20% surtax applies to the excess. If it exceeds $7,446, an additional 36% surtax applies to the amount over $7,446. The surtax is calculated on Ontario basic tax — not on your total income.

Ontario Health Premium

The Ontario Health Premium is an annual levy of up to $900 based on your taxable income. It's calculated separately from income tax and applies to Ontario residents with taxable income above $20,000. The premium increases progressively across income tiers.

Effective Rate vs. Marginal Rate

Your effective tax rate is the total obligations as a percentage of total income — the actual blended rate across all brackets. Your marginal rate is the highest rate applied to your last dollar of income. For self-employed workers with CPP obligations, the effective rate is almost always significantly higher than for an employee earning the same amount.

What Real People Actually Owe

$50,000 freelance revenue, $5,000 expenses

You're a freelance designer. You billed $50K this year and wrote off $5K in software, hosting, and home-office costs. Your net self-employment income is $45,000.

Here's the number that surprises most people: CPP alone is $4,938.50. That's because you're paying both sides — the employee chunk and the employer chunk. An employee making $45,000 would only see $2,469.25 deducted. You're paying double, and it shows up all at once at tax time.

Add federal tax ($3,305.33), Ontario tax ($1,470.90), and the Ontario Health Premium ($450.00), and your total comes to $10,164.73. That's 22.6% of your income gone to taxes and contributions.

The good news: if you put aside about $847/month, April won't hurt. The bad news: most freelancers don't, and then they're scrambling.

$100,000 contractor revenue, $15,000 expenses

You're a consultant pulling in $100K with about $15K in deductible expenses — tools, travel, professional fees. Your net self-employment income lands at $85,000.

At this income, CPP hits both ceilings. CPP1 maxes out at $8,460.90 and CPP2 adds another $832.00. That's $9,292.90 in CPP alone — more than some people's entire federal tax bill. Nobody warns you about this when you go solo.

Federal tax is $9,641.44, Ontario tax is $4,383.28, and the Ontario Health Premium is $750.00. Total obligations: $24,067.62. Your effective rate is 28.3%.

You keep about $5,078/month after everything. But you need to set aside $2,006/month to stay ahead of CRA. If you're not doing that every month, the bill at filing time is going to feel like a second mortgage payment.

$20,000 side gig + $60,000 T4 salary

You've got a day job paying $60K and you picked up $20K in freelance work on the side. This is where self-employment tax catches people off guard — your T4 job already has tax and CPP withheld every pay period, but that side income has nothing withheld. Zero.

CPP on your self-employment income is $1,963.50. Combined with your T4 income, your total federal tax is $9,943.29, Ontario tax is $4,349.13, and the Ontario Health Premium is $750.00. Total across everything: $17,005.92.

Most of that is already covered by your T4 withholdings, so you're not writing a cheque for the full amount. But the CPP on the side income? That's all you. If your T4 withholdings don't cover the extra tax from the freelance income, you'll owe the difference — plus that full CPP bill — when you file.

Set aside about $1,417/month from your side income (or about 71% of what the gig pays you after expenses) and you won't be caught short.

How This Calculator Works

What's Included

• Federal income tax (2026 brackets with BPA phase-out)
• Ontario provincial income tax (2026 brackets)
• Ontario surtax (two-tier additive)
• Ontario Health Premium (income-tier based)
• CPP base contributions (self-employed rate on net SE income)
• CPP2 contributions (self-employed rate on earnings between YMPE and YAMPE)

What's Not Included

• EI premiums (not automatically required for self-employed — optional special benefits only)
• GST/HST remittance calculation (informational reminder only)
• CRA installment payment calculation (informational reminder only)
• Capital cost allowance (CCA) or depreciation schedules
• Additional non-refundable tax credits beyond basic personal amounts
• Incorporation / corporate tax treatment