CPP and EI contributions are partly tax deductible in Canada, but most of what you pay gives you a non-refundable tax credit rather than a straight deduction. Your base CPP contributions and all of your EI premiums reduce your federal tax through a credit calculated at 15%. The enhanced portions of CPP, including CPP2, are the exception: they are genuine deductions that come off your income before tax is calculated, so they save you tax at your marginal rate.
The difference is money. A deduction shrinks the income the government taxes, so it saves you tax at whatever bracket you sit in. A credit reduces tax already calculated, and the federal credit rate is a flat 15% no matter your income. Your province or territory adds its own credit at its lowest tax rate on top.
Employees: Base CPP and EI Are Credits
If you work for an employer, the CPP and EI amounts on your T4 flow through your return as non-refundable credits. They do not reduce the income figure at the top of your return. Once federal tax is calculated, the credits chip away at what you owe: roughly $15 off federal tax for every $100 of base CPP or EI you paid, plus a smaller provincial reduction.
“Non-refundable” means the credit can bring your federal tax down to zero but cannot generate a refund on its own. If you already owe no tax, the credit does not put money in your pocket.
The Deductible Part: Enhanced CPP and CPP2
Since 2019, CPP contribution rates have been rising in stages to fund larger retirement benefits, and the tax code treats each layer differently. Your base CPP contribution stays a credit. The first additional CPP contribution and the second additional contribution (CPP2) are both full deductions from income, claimed on line 22215 of your return.1Canada Revenue Agency. Line 22215 – Deduction for CPP or QPP Enhanced Contributions on Employment Income
For 2026, the maximum amount you can claim on line 22215 is $1,074, made up of a first additional amount of up to $678 and a second additional amount of up to $396.1Canada Revenue Agency. Line 22215 – Deduction for CPP or QPP Enhanced Contributions on Employment Income Because this is a deduction, the tax saving depends on your bracket. Someone in a 33% federal bracket saves roughly $354 from the enhanced portion; someone in the 15% bracket saves about $161.
EI premiums do not have a deductible portion. The full amount stays a non-refundable credit.
Self-Employed: A Split Between Credit and Deduction
Self-employed workers pay both the employee and employer shares of CPP, and the CRA splits the tax treatment down the middle. The base rate totals 9.9%. You claim a non-refundable credit on the employee-equivalent half (4.95%) and a deduction on the employer-equivalent half (4.95%). The entire first additional rate (2%) and all CPP2 contributions (8% self-employed rate) are fully deductible.2Canada Revenue Agency. The Canada Pension Plan Enhancement – Businesses, Individuals, and Self-Employed: What It Means for You
The deductible piece goes on line 22200 and directly lowers your net income, which can also improve your eligibility for income-tested benefits.3Canada Revenue Agency. Line 22200 – Deduction for CPP or QPP Contributions on Self-Employment Income and Other Earnings
EI is optional if you are self-employed. You can register with the Canada Employment Insurance Commission to access special benefits such as maternity, parental, sickness, and caregiving benefits, but the agreement has to be active for at least 12 months before you can claim.4Canada.ca. Self-Employed Benefits – Who Can Qualify If you opt in, you pay only the employee premium rate; there is no employer-matching obligation on your own coverage.
Employers: A Full Business Deduction
For a business with employees, the employer share of CPP and EI is a straightforward deductible business expense that reduces taxable profit. This applies to corporations, partnerships, and sole proprietors with a payroll.
Where the Amounts Go on Your Return
Your T4 slip has the numbers you need. Box 16 reports your base CPP contributions and box 18 reports your EI premiums. Box 16 flows through Schedule 8 to your credit on line 30800 and your deduction on line 22215; box 18 flows to your credit on line 31200.5Canada Revenue Agency. T4 Slip: Statement of Remuneration Paid
Self-employed filers use Schedule 8 to calculate CPP owing on net business income, and the schedule splits the total into the deductible portion (line 22200) and the credit-eligible portion (line 30800).6Canada Revenue Agency. 5000-S8 Schedule 8 – Canada Pension Plan Contributions and Overpayment Certified NETFILE software handles the line assignments automatically once you enter your slip data.7Canada Revenue Agency. Sending a Tax Return
If You Overpaid, You Get It Back
Overpayments are common if you changed jobs mid-year and each employer deducted CPP or EI as though your full earnings were with them. Schedule 8 catches the excess. Any contribution above the annual maximum is refunded or applied against a balance you owe, and the amount appears on line 44800.8Canada Revenue Agency. Line 44800 – CPP or QPP Overpayment Filing an accurate return with the T4 data as issued is enough to trigger the refund; no separate request is required.