Box 26 on your Canadian T4 slip refers to the "CPP/QPP Pensionable Earnings" amount. This box is used to report the amount of your earnings that is subject to Canada Pension Plan (CPP) or Quebec Pension Plan (QPP) contributions. It's important to understand that there is a maximum limit to how much of your earnings can be subject to CPP/QPP contributions in a given year. This limit is known as the Year's Maximum Pensionable Earnings (YMPE).
If your earnings exceed the YMPE, then the amount in Box 26 will not match your total earnings for the year. Instead, it will match the YMPE for that particular year, since that's the maximum amount of earnings on which you're required to contribute to CPP/QPP.
To be certain, you would need to compare the figure with the official YMPE for the year you're filing for. The Canada Revenue Agency (CRA) website provides the YMPE for each year. Canada Revenue Agency announces maximum pensionable earnings and contributions for 2024
If your employer is not willing to change/correct the T4, you can add the corrected information and choose Print to Mail to CRA.
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