What happens after you file?

After you file your information return, you may notice that you made an error when preparing T4 slips, or an employee may ask for another copy of his or her T4 slip. For information, go to Amending, cancelling, adding, or replacing slips.

When we receive your information return, we check it to see if you have prepared it correctly. After an initial review, we enter your return into our processing system, which captures the information and performs various validity and balancing checks. If there are any problems, we may contact you.

We also verify the calculations you made on the T4 slips to make sure that the pensionable and insurable earnings you reported agree with the CPP and EI deductions you remitted. For more information, go to Pensionable and Insurable Earnings Review (PIER).

If you file by Internet, certain validity and balancing checks are done before processing your return. If there are further problems, we may contact you.

Other federal government departments use T4 information. Human Resources and Skills Development Canada (HRSDC) uses the information on the T4 slip to update a person's record of earnings file. The information on CPP contributions that we send to HRSDC determines the CPP benefits that a person will receive.

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