Avoid CRA levied interest and penalties by filing and remitting payment on time:

IF a due date for filing a return falls on a Saturday, Sunday, or a public holiday recognized by the CRA, it is considered to be filed on time if it is sent on the next open business day.

If a due date for making a payment falls on a Saturday, Sunday, or a public holiday recognized by the CRA, it is considered to be paid on time if it is received on the next open business day.