The Social Insurance Numbers may have accidentally been input. To correct this, select [Your Name]’s Personal Information from under My Info in the left side menu. This is where you will be able to change both SIN entries.
If the wrong SIN was entered and you are already at the REVIEW or FILE section then you will not be able to update it. You will need to start a new return if you went to personal information and clicked on EDIT and weren't able to update your SIN.
