Posted: Fri Aug 15, 2008 10:34 am-
Doesn't really matter as long the CRA will believe your explanation that you left Canada on December 31st 2001 and you've had no Canadian-source income (other than bank interest, which doesn't require a return) since then. If you tell them you moved during 2001 they will reduce your personal exemptions for that year which means you will be subject to penalties on that amount, but it will probably be a tiny amount of tax you owe them as a result of the personal exemption being pro-rated.
The other problem you may have is if you've still got a Canadian bank account and never told the bank you're non-resident, so they were withholding Part XIII non-resident tax. If you've still been getting T5s you should have filed a T1 to pay the tax, but once again it's probably a trivial amount of back tax unless you had some humongous amount of money in your bank account.
Might get a bit dicey with the RRSPs though if you've never filed Form 8891 with the IRS since you moved your tax home.
Certain interest payments or distributions on RRSPs (even if they remain in the RRSP) prior to Jan. 1st 2008 are subject to US income tax (even if you file Form 8891). The new tax treaty however treats RRSPs essentially the same as an IRA.
But once again, unless you've got some huge amount of money stashed away in RRSPs and the interest payments/distributions 2002-07 are enormous, I wouldn't worry about it too much, call the IRS and explain the situation. (And good luck with that, it's so obscure you'll wait all day to get an agent who can help you with it).
The IRS may also require you to file a dual-status return for 2001 when you moved, unless you moved on 31st December in which case it doesn't matter providing you filed a 1040 for 2002.
There's a remote possibility the CRA might decide you had residential ties in 2002 and tax you that year, but unless you're famous and/or very wealthy, I doubt it this late in the day. You only need to get worried if they ask you to file NR-73 for 2002, in which case you ought to get hold of a decent cross-border accountant and get some detailed help.
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Steve.