5
I will have to declare and potentially pay taxes to USA even when working in another country
You can file I-407 at any time to formally relinquish your green card and no longer have tax treatment of a green card holder. So it is no "worse" than if you had never gotten a green card. (Though there is an issue with Expatriation Tax if you are a long-...
2
Just after relocation on high skilled visa, you'll have Stamp 1. That's basic immigration status. Your spouse will have Stamp 1G or Stamp 3 (depending on some regulations). All those stamps (1, 1G, 3) don't allow you or your spouse starting a company or being a contractor in Ireland. So options 3,4,5 violate your both immigration status.
Options 1 and 2 don'...
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