Even if your spouse is not accompanying you, there are other checks necessary by IRCC that must be done. If you don't declare once you get married and you land, you might be returned at point of entry. Also, when he applies independently and states that he is married and they link him to you; the Canadian government will know that you didn't declare him at the exact time you got married. Don't forget that a web form must always be raised once there is a change in situation which includes marriage .