Schedule 8 Tax Form: CPP Contributions, CPP2, and Overpayments

The Schedule 8 tax form is what Canadians attach to a T1 return to calculate Canada Pension Plan contributions and flag any overpayment. You’ll need it if you were self-employed, earned pensionable income that didn’t appear on a T4 slip, worked for more than one employer, or are between 65 and 70 and want to stop or restart contributing while collecting CPP. Quebec residents don’t use Schedule 8 for QPP; Revenu Québec’s Schedule U handles that separately.¹

Who Actually Needs to File It

A regular employee with one job whose employer withheld the right amount of CPP all year doesn’t need Schedule 8. The T4 already tells the CRA everything it needs. The form comes into play in four situations:

You had self-employment income. You owe both the employee and employer shares of CPP, calculated from the net income on your Form T2125.²
You had pensionable earnings that weren’t on a T4, such as tips or gratuities.
You worked for more than one employer, and the combined CPP deductions may have pushed you past the annual maximum.
You’re 65 to 70, already collecting CPP retirement benefits, and want to stop contributing (or restart).

CPP contributions start once you turn 18 and end at age 70, no matter what.³

The 2026 Numbers the Form Runs On

Schedule 8 uses a handful of figures that change most years. For 2026:

Maximum pensionable earnings (YMPE): $74,600
Basic exemption: $3,500 (unchanged since 1998)⁴
Employee contribution rate: 5.95 percent (employer matches)
Self-employed rate: 11.90 percent (both halves)
Maximum employee contribution: $4,230.45
Maximum self-employed contribution: $8,460.90⁵

How to Complete Schedule 8

Before starting, pull your T4 slips from every employer. You’ll use box 16 (CPP contributions), box 17 (QPP, if any), and box 26 (total pensionable earnings).⁶ If you’re self-employed, you’ll need the net income figure from your completed T2125.⁷

The calculation itself is straightforward. Take your total pensionable earnings, subtract the $3,500 exemption, and multiply by 5.95 percent (or 11.90 percent if you’re self-employed). The form then compares that figure to what your employers already withheld. If the withholding was higher, Schedule 8 flags an overpayment. If it was lower, because you had unreported tips or self-employment income, you owe the difference.⁵

Earnings are capped at $74,600 for the base calculation. If you earned $120,000, base CPP only applies to the first $74,600 minus the exemption. Anything between $74,600 and $85,000 is picked up by the separate CPP2 calculation.

The Second Layer: CPP2 for Higher Earners

A second tier of contributions started in 2024. CPP2 covers income between the first ceiling ($74,600 for 2026) and a second ceiling called the YAMPE, set at $85,000 for 2026. Most employees don’t need to touch this on Schedule 8 because their employer already deducted CPP2 correctly. Self-employed filers, though, calculate it themselves.⁸

The CPP2 rate is 4 percent for the employee and 4 percent for the employer, or 8 percent combined for the self-employed. The 2026 maximum works out to $416 for employees and $832 for self-employed contributors. Note two things that differ from the base calculation: there is no $3,500 exemption before applying the rate, and all CPP2 contributions are fully tax-deductible.⁹

How Your CPP Contributions Are Treated on the Return

Not every dollar of CPP you pay is treated the same way, and the difference can move your refund noticeably.

For employees, the base 5.95 percent withheld by your employer becomes a non-refundable tax credit on line 30800. The enhanced portion is claimed instead as a deduction on line 22215. A credit reduces the tax you owe; a deduction reduces the income that gets taxed in the first place.¹⁰

Self-employed filers split their base contributions down the middle. One half (the 4.95 percent employee equivalent) becomes a non-refundable credit. The other half (the 4.95 percent employer equivalent) is a deduction. The first additional enhanced contributions (2 percent total) and all CPP2 contributions (8 percent total) are fully deductible.⁹

Stopping or Restarting Contributions Between 65 and 70

If you’re 65 to 70 and already receiving CPP retirement benefits, you can elect to stop contributing. You file Form CPT30, Election to Stop Contributing to the Canada Pension Plan, and give a copy to your employer. It takes effect the first day of the month after you deliver it. Hand it in during June, and contributions stop July 1.¹¹

You can revoke the election later to rebuild your benefit, but not in the same calendar year you made it. If you stopped in 2025, the earliest restart is 2026. Self-employed individuals aged 65 or older can also elect to stop, with the earliest effective date being the month they turn 65.¹¹

At 70, the choice ends. Employers stop deducting CPP after the last pay period of the month you turn 70, and self-employed contributions stop entirely.³

Getting Back a CPP Overpayment

Overpayments usually happen when you had more than one employer during the year. Each one deducts CPP as if they’re your only source of pensionable income, so your combined withholding can easily blow past the annual maximum. Schedule 8 catches it by comparing your total contributions against the ceiling.

The overpayment flows to line 44800 of your T1. The CRA either refunds it or applies it against any balance owing.¹²

Most people never see Schedule 8 as a paper form. Certified tax software builds it into the T1 automatically and files everything together. If you’re paper-filing, attach the completed schedule to your T1 General and send it to your tax centre.

1
Canada Revenue Agency. 5000-S8 Schedule 8 – Canada Pension Plan Contributions and Overpayment
2
Canada Revenue Agency. T2125 Statement of Business or Professional Activities
3
Canada Revenue Agency. Starting and Stopping CPP Deductions
4
Department of Justice Canada. Canada Pension Plan – Year’s Basic Exemption
5
Canada Revenue Agency. CPP Contribution Rates, Maximums and Exemptions
6
Canada Revenue Agency. T4 Slip: Statement of Remuneration Paid
7
Canada Revenue Agency. Self-Employed Business, Professional, Commission, Farming, and Fishing Income: Chapter 2 – Income
8
Canada Revenue Agency. Canada Pension Plan (CPP) and the CPP Enhancement
9
Canada Revenue Agency. Businesses, Individuals, and Self-Employed: What It Means for You
10
Canada Revenue Agency. Line 30800 – Base CPP or QPP Contributions Through Employment Income
11
Canada Revenue Agency. Canada Pension Plan (CPP) Contributions for CPP Working Beneficiaries
12
Canada Revenue Agency. Line 44800 – CPP or QPP Overpayment