Posted: Sat Jun 21, 2008 10:39 pm-
You need to declare to the CRA that you are no longer resident in Canada. They might want you to do an NR-73. On the T1 you have to declare the date that you left, so on your final tax return you should have checked that box. If you didn't file a T1 for the last year you were in Canada, you will be assessed a late filing fee and any penalties.
You might also have needed to file a dual-status return when you moved to the US for the first year that you were there.
If you do need to go back and file a T1, best time to say you left is 31st December otherwise your personal exemptions will be reduced by however many days and you will almost certainly owe tax, and maybe penalties on that amount.
http://www.cra-arc.gc.ca/tax/nonresidents/menu-e.html_________________
Steve.