Most Canadian income tax and benefit returns for 2018 are due on April 30, 2019. If you or your spouse or common-law partner are self-employed, you have until June 17, 2019.
You can file online as early as February 18, 2019.
Filing on time ensures your benefit and credit payments are not delayed or stopped, while filing early may help you get your refund quicker. If you have a spouse or common-law partner, they should also file a return early.