If you change employment or work for multiple employers during the year you must ensure that you have submitted all off your T-4's to avoid penalties on non-reported income.
If you receive a T slip after filing your return you must file a T1/adjustment in order to report the income and avoid penalties and interest for unreported income.Please see the Canada Revenue Agency website for an explanation of the requirements and potential penalties for non-compliance.
If you need to file a T1 adjustment please contact us.