If you were a non-resident during that period, then you may not have to. You would need to contact the Canada Revenue Agency (CRA) to be sure. If you are in Canada or the United States, you can call the Canada Revenue Agency (CRA) at 1-800-959-8281. If you are elsewhere, you can call 613-940-8495. This page has more ways to contact the CRA: Contact the Canada Revenue Agency