Generally, your return for 2017
has to be filed on or before April 30, 2018. If you or your spouse have your
own business, your return for 2017 has to be filed on or before June 15, 2018.
However, any balance owing is still due on or before April 30, 2018.
Filing due dates for the 2017 tax
return:
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/important-dates-individuals/...