Canadian companies are required to file their federal income tax returns within 6 months after their fiscal year end. Consequently, companies which had a calendar year end on December 31, 2020 must file their 2020 income tax returns on or before Wednesday June 30, 2021.
To assist taxpayers in filing those returns, the Canada Revenue Agency (CRA) has issued its guide to preparing the 2020 corporate income tax return. That guide is available on the CRA website at the https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4012.html.