peters wrote:If I move my tax home to US for 9/2008-12/2008 period and file 1040 as married. Do I still need to file 1040NR for 1/2008-8/2008 period if I did not have any income in the us or connected to us in this period? If yes what income do I report on this form?
You report zero. Different IRS agents say different things when it comes to this situation. You don't have to file it if your income is less than $3,400, but does that mean during that period, for the whole year, or do you pro-rate it (i.e. $3,400 divided by the number of days)? Given that it only takes five minutes to put your name and address on it and put zero on it, it's not worth worrying about. Read the 1040NR instructions (and confuse yourself further).
The other thing is if you decide to file non-resident for the whole year and claim a tax treaty provision, you don't have to fill in 8833 if your income is less than $100,000. But it doesn't hurt if you do file it, which is why I always tell people to phone the IRS and get it from the horse's mouth because if they decide you do need to file it, it's not the easiest form to fill in. This "$100,000" limit is a bit funky because it really means primarily from direct employment, but that's vague. If it's all from other sources it's a $500,000 limit but what is the break point between the two? Like I said, phone the IRS, because it's somewhat subjective.
Also on the canadian side, do I report only income from 1/2008 to 8/2008 on T1 form with no mention of w2 income in the us? Is there in canada equivalent of dual-status ta report?
Yes there is, if you have Canadian-source income after you left that is subject to reporting, you have to file a non-resident T1 pro-rated for that portion of the year.
You mention that it is a problem (or dificult) to move the tax home back to Canada. Why?
Because it's not clear what forms you have to fill in, there are many different ones depending on your circumstances. Once again you have to file dual-status but beyond that circumstances vary so the filing requirements vary. Most people need to file a W-8BEN with their bank. A lot of people need to file 1040-C. Some people need to file 8854 or maybe 8840 or 8833. Once your tax home moves to the US, if you have over $10,000 in a foreign bank account you have to file the FinCEN FBAR form - well you stop doing that but then FinCEN can get suspicious because they're not part of the IRS.
What happens to your RRSP? Well it's somewhat clear what happens if you move your tax home to the US and keep it, but even the CRA doesn't seem to know what happens if you move your tax home to the US and then move it back, what is your contribution amount, because you can't contribute while you're in the US, so can you carry over unused amounts from x point in time? This is an entirely new thing for the CRA because only the new US-Canada tax treaty has a provision protecting RRSPs.
If you're subject to departure tax, well it's obvious what your bill is if you permanently leave Canada, but the bill can be pro-rated if you then come back and then you have to get your money back from the CRA. And what is the capital gains tax liability, say on real property that you leave behind in the US? Because you haven't disposed of it, you still have it. Technically when you do dispose of it, you owe the US money up to the point that you left the US (assuming it wasn't your principal residence) and then the rest of it goes to the CRA based on the capital gain after moving back. Try calculating that. Try remembering to report it even, several years down the road.
And so on.
I dare say for Joe Average it's not too much of a major problem, but lots of people have RRSPs so it's not just a problem for Mr Moneybags with his mansion in Palm Beach.
Oh and if you're lucky enough to become a US citizen and then move back to Canada, you have to file a 1040 every year until you die and there is a foreign income exclusion cap of $87,600 - earn over that and it's subject to US income
taxes even though you don't live there anymore.
Once you become entangled with the IRS it's quite difficult to disentangle yourself.
Steve.