What is a Corporation Income Tax Return and How do You File One in Canada? A corporation income tax return is a report that a company files with the Canada Revenue Agency (CRA) to calculate how much income tax they have to pay. In the United States, it is known as a Form 1120. A corporation tax return includes information on how much income has been earned, what expenses have been incurred and what assets have been used to generate the earnings. The corporation will also use this form to figure out any taxes owed. Additionally, this form will be…