As an international student, what do I have to declare besides the tuition fees?

You will enter your T slip from the school to claim your tuition fees. If you worked you will have to file your T4 slip. You will be entitled to get GST/HST credit and Canada Carbon Rebate

The goods and services tax/harmonized sales tax (GST/HST) credit helps you offset the tax you pay on things you buy. If you are at least 19 years old, have a low or modest income, and are eligible, apply for a tax-free quarterly payment.

 When you get into the Provincial part of your tax return this is where you will complete everything step by step and able to claim these credits.

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