Box 16A on your 2025 T4 shows your CPP2 contributions — the second tier of enhanced CPP for workers earning between $71,300 and $81,200. Unlike CPP1 (which gives a non-refundable credit at the flat 14.5% federal rate), CPP2 is fully deductible from your income on line 22215, making it more valuable for higher earners in top brackets.
The Two-Tier CPP System Explained
Canada's CPP (Canada Pension Plan) has existed since 1965 as a single-tier mandatory contribution system for working Canadians. Starting in 2019, the federal government began a multi-year enhancement to CPP, phasing in higher contribution rates and a new second earnings tier.
The enhancement reached its final form in 2024 with the full introduction of CPP2:
- CPP1 (original): Applies to employment earnings from $3,500 (basic exemption) up to the Year's Maximum Pensionable Earnings (YMPE). For 2025, the YMPE is $71,300.
- CPP2 (new enhanced tier): Applies to employment earnings from the YMPE ($71,300) up to the Year's Additional Maximum Pensionable Earnings (YAMPE). For 2025, the YAMPE is $81,200.
The government introduced CPP2 to increase the retirement income replacement rate for working Canadians — from approximately 25% of pre-retirement earnings under the original CPP to approximately 33% under the fully enhanced CPP (including CPP2). The extra contributions today fund larger CPP cheques in retirement.
CPP1 vs CPP2: The Key Differences in How They're Taxed
This is the most important thing to understand about CPP2 for your 2025 tax return: CPP1 and CPP2 are treated completely differently on your T1.
- CPP1 (Box 16): Your CPP1 contributions give you a non-refundable tax credit. The credit is calculated at the federal rate of 14.5% (and a corresponding Ontario provincial rate). If you contributed the maximum CPP1 of $4,034.10 in 2025, your federal tax credit is $584.94. The credit reduces your tax payable dollar-for-dollar, but only at that flat 14.5% rate — regardless of your actual marginal rate.
- CPP2 (Box 16A): Your CPP2 contributions are treated as a direct income deduction on line 22215 of your T1. This means they reduce your taxable income — and the tax saving scales with your marginal rate.
Why does this matter? Consider someone in Ontario earning $120,000 with a combined marginal rate of about 48.35%:
- A $396 CPP1 credit saves them $396 × 14.5% = $57.42 in federal tax (plus provincial).
- A $396 CPP2 deduction saves them $396 × 48.35% = $191.47 in combined tax.
The CPP2 deduction is worth more than 3 times as much in absolute dollar terms for a high earner compared to an equivalent CPP1 credit. This is why the government deliberately chose to make CPP2 a deduction rather than a credit.
A non-refundable credit always saves you 14.5% federal tax regardless of your bracket. A deduction saves you tax at your actual marginal rate — 20.5%, 26%, 29%, 33% federally, plus provincial. The higher your income, the more valuable the CPP2 deduction becomes relative to a credit of the same dollar amount.
How to Read Your 2025 T4: Box 16 vs Box 16A
Your employer-issued T4 slip for the 2025 tax year contains two separate CPP boxes:
- Box 16: CPP contributions — This is your CPP1 amount, the same box that has always been on T4s. In 2025, the maximum CPP1 employee contribution is $4,034.10 (5.95% on earnings from $3,500 to $71,300).
- Box 16A: CPP2 contributions — This is new and only populated if you earned above $71,300 in employment income from this employer. The maximum CPP2 employee contribution is $396.00 (4.00% on the $9,900 band from $71,300 to $81,200).
If your total employment income from all sources was below $71,300 in 2025, Box 16A will be blank or show $0. Only workers earning above the YMPE will see any CPP2 contributions.
Important: if you had multiple employers during 2025, each T4 will show the CPP contributions withheld by that particular employer. CPP2 will only appear on T4s from employers where your earnings from that employer alone exceeded $71,300. This can create reconciliation complexity on your Schedule 8 — but the tax software handles it automatically.
2025 CPP Rates and Limits
| CPP Tier | Rate | Earnings Range | Max Employee Contribution | Tax Treatment | T4 Box |
|---|---|---|---|---|---|
| CPP1 | 5.95% | $3,500 – $71,300 (YMPE) | $4,034.10 | Non-refundable credit (line 30800) | Box 16 |
| CPP2 | 4.00% | $71,300 – $81,200 (YAMPE) | $396.00 | Income deduction (line 22215) | Box 16A |
Note: the employer matches both CPP1 and CPP2 contributions dollar-for-dollar. So the total CPP2 contribution (employee + employer) is $792 per worker at maximum earnings in the CPP2 band.
What CPP2 Means for Your Future Pension
CPP2 contributions don't just give you a tax deduction today — they also build higher CPP benefits for retirement. The CPP2 tier adds an additional income replacement layer on top of the CPP1 base benefit.
Under the fully enhanced CPP (CPP1 + CPP2), the pension replaces approximately 33% of pre-retirement earnings up to the YMPE, compared to the original 25% under CPP1 alone. Workers who contribute CPP2 on earnings between $71,300 and $81,200 will receive a proportionally higher CPP benefit based on that additional contribution history.
For context: the maximum CPP2 benefit from a full career of CPP2 contributions is estimated to add roughly $2,000–$4,000 per year to your annual pension, on top of the CPP1 base benefit. It's meaningful but not transformative — particularly for workers who also have RRSP savings and other pension income.
Unlike self-employed workers who must pay both employee and employer portions of CPP1 (and can choose whether to opt into CPP for EI purposes), CPP2 is mandatory for all employees earning above the YMPE. There is no provision to opt out of CPP2. The contribution is deducted automatically by your employer and you simply claim the deduction on your T1.
Self-Employed Workers: CPP1 and CPP2 Doubled
Self-employed Canadians pay both the employee and employer portions of CPP — that's the standard rule for CPP1 (effectively 11.90% on earnings from $3,500 to $71,300, for a maximum self-employed CPP1 contribution of $8,068.20). The same principle applies to CPP2:
- Self-employed workers pay 8.00% CPP2 on earnings between $71,300 and $81,200 (both employee and employer shares).
- Maximum self-employed CPP2 contribution: $696.00 (compared to $396 for employees, whose employer matches the other half).
- The full self-employed CPP2 amount is deductible from income on line 22215 — the same deduction treatment as the employee CPP2 portion.
For self-employed workers, the CPP2 deduction provides meaningful tax relief given the higher total contribution amount. At a 48.35% combined marginal rate, the $696 self-employed CPP2 deduction generates a tax saving of approximately $337.
See how CPP2 (Box 16A) affects your 2025 Ontario tax
Enter your income and payroll deductions to calculate your full tax picture — including CPP1 credit and CPP2 deduction.
Frequently Asked Questions
My income is $65,000. Will I have a Box 16A on my T4?
Almost certainly not. Box 16A (CPP2) only applies to employment earnings above the YMPE of $71,300 in 2025. If your total employment income from this employer is below that threshold, you only pay CPP1, and Box 16A will be blank or absent from your T4. You can verify by checking your final pay stub of the year — if CPP2 was ever deducted, it would appear as a separate line item.
How do I claim CPP2 on my tax return?
CPP2 contributions shown in Box 16A of your T4 go on line 22215 of your T1 return as an income deduction. This is in the "Other deductions" section of the T1, and it reduces your net income directly at your marginal rate. Most tax software enters it automatically from your T4 data. Do not confuse this with the CPP1 credit on line 30800 — they are separate entries in different parts of your return.
Will CPP2 give me significantly more retirement income?
Incrementally yes, but modestly in isolation. CPP2 contributions are based on the earnings band from $71,300 to $81,200 — a width of only $8,700. The maximum employee contribution is $396 per year. Over a full career of CPP2 contributions (say 30 years), and depending on when you start collecting CPP, CPP2 could add a few thousand dollars per year to your annual pension. That's a meaningful supplement, but the biggest driver of your total CPP benefit remains your CPP1 contribution history over your entire working life.
I have two T4 slips from different employers. Both show CPP1 contributions. Did I pay too much CPP?
Possibly. Each employer withholds CPP independently up to the annual maximum they calculate for that employment relationship. If your total employment income across both employers exceeded $71,300, the second employer may have continued deducting CPP1 beyond the actual annual limit of $4,034.10. The excess CPP1 contribution is automatically refunded through Schedule 8 on your T1 return — you'll receive it as a credit against your tax owing or as an additional refund. Tax software handles this calculation automatically when you enter all your T4 slips.
What if my employer didn't deduct CPP2 correctly?
If you earned more than $71,300 from a single employer and no CPP2 was deducted (or the amount looks wrong), contact your employer's payroll department. Employers are legally required to deduct and remit CPP2 for eligible employees. The CRA may also catch discrepancies between T4 information returns and your filed T1. You reconcile CPP contributions on Schedule 8 — if CPP2 was under-deducted, you may owe the employee portion; if over-deducted, you'll receive a credit. Don't leave a potential discrepancy unresolved.