I think the value of living in another country is really about personal choices and that is way more than money.

Also I keep thinking that the disruption of moving the company, legal and personal challenges there and etc are REALLY going to hit your productivity / momentum. If you're looking at a million dollars, do you chose to take a big disruption at that point?

I think there's a lot more to consider here than how you frame it. I'm not sure the outcomes here is as simple as tax rate.