Line 30800 on the T1 General is the non-refundable tax credit for the base portion of your CPP or QPP contributions withheld from employment income.1Canada.ca. Line 30800 – Base CPP or QPP Contributions Through Employment Income The figure comes from the CPP or QPP boxes on your T4 slips, but only the base share of what was deducted belongs on this line. The enhanced share goes elsewhere on your return, and self-employed contributions have their own line. For 2026, the maximum pensionable earnings are $74,600 with a $3,500 basic exemption, so base contributions apply to up to $71,100 of employment earnings.2Canada.ca. CPP Contribution Rates, Maximums and Exemptions
Base vs. Enhanced: The Split That Matters
The employee CPP rate for 2026 is 5.95%, but that single rate is not a single thing on your tax return. It breaks into two pieces that land on different lines and produce different tax benefits.
- The base portion is 4.95% for CPP (5.3% for QPP). This is what goes on Line 30800 as a non-refundable tax credit.
- The enhanced portion is the 1% first additional contribution. It is claimed as a deduction on Line 22215, not as a credit.3Canada.ca. Line 22215 – Deduction for CPP or QPP Enhanced Contributions on Employment Income
- CPP2, the second additional contribution of 4% on earnings between $74,600 and $85,000, is also enhanced. It goes to Line 22215, never Line 30800.4Canada.ca. Second Additional CPP (CPP2) Contribution Rates and Maximums
Getting this wrong is the most common Line 30800 mistake. If you enter your full T4 CPP contribution on Line 30800, you have overstated the credit and understated the deduction. A credit reduces your tax at the lowest federal rate; a deduction reduces your taxable income and can save tax at your top marginal rate. They are not interchangeable.
The 2026 employee maximums reflect the same split. Total employee CPP tops out at $4,230.45, with matching employer contributions.2Canada.ca. CPP Contribution Rates, Maximums and Exemptions The Line 22215 deduction for employment income maxes out at $1,074, made up of $678 in first additional contributions and $396 in CPP2.3Canada.ca. Line 22215 – Deduction for CPP or QPP Enhanced Contributions on Employment Income Whatever is left of your T4 CPP after removing that enhanced portion is the base amount for Line 30800.
How the Credit Reduces Your Tax
Line 30800 is non-refundable, and the dollar figure you enter is not the tax reduction. The amount is multiplied by the federal credit rate, which is 14% for 2026. A base contribution figure of $3,519, for example, produces a federal tax reduction of roughly $493.
Because the credit is non-refundable, it can bring your federal tax down to zero but will not generate a refund on its own. Any portion of the credit beyond what you owe in federal tax is simply unused. A parallel provincial or territorial credit appears on Line 58240 of your Form 428, calculated at your province’s own rate.1Canada.ca. Line 30800 – Base CPP or QPP Contributions Through Employment Income
Where the Number Comes From
For a straightforward employment situation, the source document is your T4. Each T4 slip shows the CPP or QPP contributions your employer deducted during the year. If you had one job and stayed under the maximum, the base share of those contributions is what belongs on Line 30800. Certified tax software will typically pull the T4 data and route the base and enhanced portions to the correct lines automatically. If you file on paper, Schedule 8 walks through the split.
Your T4s should arrive by the end of February, and copies are also available through the CRA’s My Account.5Canada.ca. Tax Slips – Get a Copy of Your Slips Quebec residents follow the same Line 30800 rules on the federal return, using the QPP base rate of 5.3%.6Retraite Québec. Contributions to the Quebec Pension Plan
If You Are Self-Employed
Line 30800 is for employment income only. If your CPP contributions come from self-employment, the base credit belongs on Line 31000 instead.7Canada.ca. Line 31000 – Base CPP or QPP Contributions on Self-Employment and Other Earnings Self-employed workers also report total CPP payable on Line 42100, which Schedule 8 calculates from net business income.8Canada.ca. Line 42100 – CPP Contributions Payable on Self-Employment Income and Other Earnings Because a self-employed person pays both halves, only half of the base contribution flows through to Line 31000 as a credit; the other half plus the enhanced portion is claimed as a deduction.
If you had both a T4 job and self-employment income in the same year, expect entries on both Line 30800 and Line 31000. Schedule 8 keeps the two streams separate and applies the annual maximum across them.
Overpayments From Multiple Jobs
When you work for more than one employer in the same year, each employer deducts CPP independently without knowing what the others have taken. Combined deductions can easily exceed the annual maximum. The overpayment is refunded automatically when you file: Schedule 8 compares your total contributions from all T4 slips against the annual limit and adjusts the amount that lands on Line 30800 down to the correct base credit, while the excess is returned to you.9Canada.ca. About the Deduction of Canada Pension Plan Contributions Employers cannot recover their matching overpayment the same way.
One boundary worth knowing: if you are between 65 and 70 and receiving a CPP retirement pension, you can elect to stop contributing by filing Form CPT30 with your employer and the CRA.10Canada.ca. CPT30 Election to Stop Contributing to the Canada Pension Plan, or Revocation of a Prior Election Otherwise, contributions continue up to age 70 and the same Line 30800 rules apply.