📊 Line 42100 – CPP contributions payable on self-employment income and other earnings

🧮 Who Must Report CPP on Line 42100?

If, at the end of the tax year, you were a resident of a province or territory other than Québec, you calculate—not just claim—your CPP contributions payable on self-employment and certain other earnings and enter the amount on Line 42100.

If you were a resident of Québec on December 31, the Quebec Pension Plan applies instead, and Line 42100 does not apply to your federal return; report those contributions on your Québec return.

📋 How to Calculate the Amount

CPP contributions for self-employment income are based on net business earnings reported (for example from a T2125 form). You use either of the following:

• 📌 Schedule 8 – Canada Pension Plan Contributions and Overpayment (typical for within one province).
• 📌 Form RC381 – Inter-Provincial calculation for CPP and QPP contributions and overpayments (if you lived/worked across provinces).

These forms calculate the CPP contribution based on pensionable earnings after the basic exemption threshold. Generally, you pay both the “employee” and “employer” share when self-employed.

📌 What Counts as Pensionable Earnings?

You pay CPP on your net self-employment income that exceeds the basic exemption (for 2025, $3,500), up to the Year’s Maximum Pensionable Earnings (YMPE) and possibly additional enhanced amounts. T4 and other income slips show CPP pensionable amounts for employment earnings.

🧾 Reporting on Your Return

Once you complete Schedule 8 or Form RC381, carry the total amount of CPP contributions payable to Line 42100 of your T1 General Income Tax and Benefit return. This becomes part of your total payable for the year and affects instalments and possible balances owing.

📉 Related CPP Lines on Your Tax Return

• 📍 Line 31000 – Base CPP or QPP contributions on self-employment income and other earnings (non-refundable credit).
• 📍 Line 22200 – Deduction for CPP or QPP contributions on self-employment and other earnings.
• 📍 Line 44800 – CPP/QPP overpayment if contributions exceed required amount.

📌 Example Calculation (Simplified)

Suppose your net self-employment earnings subject to CPP are $60,000. After subtracting the basic exemption, the CPP contributions are calculated on the eligible amount using the applicable rate. The resulting total from Schedule 8 or RC381 is then reported on Line 42100. Your tax software typically calculates this automatically.

📍 Helpful Links

• T1 General Income Tax & Benefit Package
• Form RC381 – Inter-Provincial CPP/QPP Calculation
• Self-Employed Individuals – Tax information