回複：回複：應該沒有影響。我們當時也沒有申請醫療保險

We applied SIN. Under the old law, you need to show that you keep ties in Canada. But for the new law, you have to physically be here to complete your residence requirment. So, I would say no affect at all if you don't apply SIN. If you do want to apply, any time is OK.