skoper wrote:My understanding is that the two residency tests are mutually exclusive. I will not be a resident of Canada since I (presume) will qualify - no dependents, no real estate, no spouse, no car, no personal possessions, etc. The test has nothing to do with my level if residency in the US. In the US, since (for the first year) I will be there less than 183 days, I will subject to the substantial presence test, which I also fail, making me a non-resident alien. After 1 or 2 years, I will become a resident alien in the US.
The substantial presence test has little bearing on Canadians except in rare situations because of the tax treaty. You can stay a non-resident of the US more or less indefinitely by filing an 8833 with your 1040NR every year and maintaining residential ties to Canada. Also, if your intent is to principally reside in the US, you become a tax resident on day 1, not day 183, as soon as you establish significant ties there such as your principal residence and so on.
However if you've got no ties here, seems hardly worth it to maintain a TFSA, given that there is no capital gains tax in the US on such small investments, plus you'll probably pay more income tax doing it that way.
Bear in mind the US-Canada tax treaty is the most comprehensive treaty the US has with any other country and it was updated in 2008, so consider that when reading any tax publications. The IRS tells me that the new publication 597 (the tax treaty guide) will be on-line next month. The current one is 2006 and is out-of-date.
Steve.