Good idea ROF. I'll post up what I learn. Are you renting out your house in the US?
I rent out my house at market rate. Unfortunately, it is not financially efficient. It has extremely high maintenance and repair costs, and when you add in taxes, insurance, and management, it hasn't even broken even over the past few years.
The depreciation tax break is nice, but I will eventually have to pay that back. There's no question that I would be far better off in financial terms selling the house, investing the money, and buying a different house when I return to the US.
As I mentioned before, I would love to be able to claim a different state of residence that would reduce our tax burden. In the past, I did that, but my circumstances were different. I didn't own a home in the State I was leaving, I was moving overseas, and I had connections to the new State that would outweigh remaining attachments to the old state. I don't think I'm in that position now. Having lived in my house, even though I am renting it out at market rate and I live overseas, I think I would be inviting a challenge from the State if I tried to claim domicile in another state based on not much more than a drivers license and a p.o. box. If I return to the State, I think it would be even more likely. "Intention to return" is one of the fundamental points in defining domicile, and at this point, I might still return.
On balance, I have decided not to take the risk of trying to change my domicile. It also seems to me that whatever has worked in the past should not be considered a guarantee for the future. Most states are fairly desperate for money right now and the limitations imposed on deductions for state and local tax are causing many people to rethink their states of residence. In these circumstances, it isn't hard to imagine states that haven't been "sticky" in the past getting more interested in tracking down former taxpayers who they think are still residents.
The calculus might be different for you. Do keep in mind that this is not an "innocent until proven guilty" scenario. If your former state challenges your decision with an audit, the onus is on you to "prove" that you are more resident in your new domicile than your old one, and simple things like a P.O. box and a driver's license might not be enough to win your case. As I said before, getting state-specific advice tailored to your circumstances from experts would be money well spent. I'd ask them very specifically what they think the likelihood of an audit would be, the likelihood of you winning if challenged, the cost of mounting a good defense, and the potential costs of losing. I would also suggest asking how much keeping your house as a rental property (or selling it) affects the situation.
Good luck!