Your return if it has been filed successfully today then you wait for CRA to send you your Notice of Assessment. If you did owe the government there is a possibility that there will be interest charges applied. Once you receive your NOA it will advise you. Please be sure when you file a return that you receive a confirmation number showing that it was successfully filed. If you have a CRA "My Account" you can check for any updates on there. If you don't you can go to CRA website and register for a "My Account" which will give you access to your income tax information and any updates.