Reassessment notice, CRA are asking extra $1,154. How is it different when income was not entered manually but through T4, T5..etc from CRA account? what went wrong?

Did you use Auto-Fill for your return, or did you enter them manually?

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I used Auto-Fill

You can look at your CRA "My Account" It is possible that you had another T-Slip that was not sent in to the CRA until after you filed your return or maybe an adjusted one.

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