3% tax every year for 20 years is 46%. It doesn't matter what interest rate you get on your holdings; that tax reduces your worth 20 years down the line by 46%.
> the idea is an AMT tax if you pay 3 million in US taxes and keep 100 million untaxed offshore that's no additional taxes. Next year if you add another 100 million (200m total) your US taxes also increase by another 3 million. So you might as well bring back enough that you would have paid 3 million in extra taxes so 200m - 3/.35 = 191.4m off shore and 8.6m brought back.
I'm not following you. Suppose every year my goal is to minimize the taxes I pay that year. What benefit do I see from repatriating those $8.6M?
Scenario A: I have $200M offshore and pay a 3% offshore-holdings penalty of $6M. Taxes are $6M.
Scenario B: I have $191.4M offshore on which I pay a 3% offshore-holdings penalty of $5,742,000. I repatriate $8.6M on which I pay a 35% repatriation penalty of $3,010,000. My total taxes in this scenario are $8,752,000, which I notice is more than $6,000,000. What did I gain?