According to the Canada Revenue Agency (CRA), you must report the T4 slip as well as the Statement of World Income. The reason being: The T4 slip is your actual slip meant to report your income as well as all deductions associated; however with the Statement of World Income, it's only purpose is to identify which federal, provincial, or territorial tax credits you are eligible for, meaning you will not be double taxed if both are reported and will be beneficial for you to do so to get your eligible credits. The reason that you are entering a value on the "Other Canadian-Source Income" line and receiving a refund is because the system is automatically calculating which credits you are eligible for. For more information, check here: Non-Residents and Income Tax
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