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Couple of questions:
I'm sure it would still be less than what they are paying now otherwise why make the move?
That's a question? (Sounds like a statement and, if so, you'd be correct.)
In any case, as I've said above their inversion will allow foreign source income to be taxable only in that foreign countries (or countries). Most countries only tax income earned within their borders. However, the US taxes its citizens and corporations on world-wide income. It's a bit glutenous.
The US will, however, give a tax credit for taxes paid to other countries on income earned in those countries in an effort to mitigate double taxation. E.g., (Note the US corporate tax rate is 35%) if the foreign country's tax rate was 35% (or greater) the credit would fully cancel out any tax owed to the US.
If the foreign country's tax rate was lower than 35% (the US tax rate) the corporation would pay the additional amount to the US. E.g. the foreign country rate is 15%, then a 20% tax would be paid to the US. (Total tax of 35%, less foreign tax credit of 15%, equals 20% tax paid to the US.)
It's because our corporate tax rate is the highest in the world that inversions are being done. If our rate was the same or lower there would be no benefit to it.
Do you support all these Companies becoming Foreign entities?
I don't care either way. But a couple of comments:
1. What makes a corporation a "US company"? I would think it would be ownership. If so many "US" corporations are not US companies at all as much of the ownership is foreign. If it's just where they are registered I don't see how anybody should care either way. And beyond the technicalities an inversion is nothing more than a changing of the registration.
2. Much of our US companies' growth comes from business abroad, not here. While I personally own no stock whatsoever, I can see how shareholders of US companies would support such moves so that their company can compete with other foreign businesses.
As I've said here before, corporations are simple yet logical 'animals' that can easily be manipulated/motivated by the rules we enact. In this case I think it perfectly clear that such corporations are moving abroad because our laws motivate them to do so. If one doesn't like them moving abroad the solution isn't difficult, in fact it's rather obvious; it's just that ideology triumphs over logic.
Fern