That calculation only works if this is a temporary situation. Bringing the money home adds a one-time charge of 35% (in reality even less, as Apple can deduct what it has paid in corporate income tax on that sum in the country the money is currently held, for Ireland the regular rate would be 12.5%, meaning if Apple had a $100 bn profit in Ireland, it already has paid a 12.5% tax on that and if Apple brings the remaining $87.5 bn home, it 'only' needs to pay the difference, ie, $35 bn - $12.5 bn = $22.5 bn).It's stated in the article. Profits earned outside the US are subject to the US tax. The US is about the only country that taxes profits from foreign sources. So if Apple brings those profits back, they're subject to a tax that can be as much as 35%. Borrowing money for Apple is cheap, about 2-3%. So it costs a lot less to borrow the money for use here, in the US, than bringing those profits back.
So no, they can't just spend the money no matter which bank it's in without paying the taxes. And most of their money isn't in cash in a bank, it's in short term, medium term and long term investments,
But if Apple takes out a $87.5 bn loan in the U.S. at 2%, that creates an annual expenditure of $1.75 bn. Therefore, after 13 years, it will have paid more in interest than it would have paid in taxes. And thus, if in 13 years, Apple can repatriate the money tax-free, paying interest on the loan will have turned out to be the more expensive strategy. If the 'tax holiday' isn't a zero tax rate but merely a lower tax rate, eg, 10%, that time period gets even shorter.
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Correction: They had a sweetheart deal, that deal is no more. Since 2015 or 2016, Apple is paying the full 12.5% rate in Ireland.There is no "double" taxation. When the money is repatriated, you subtract the amount already paid in taxes on foreign soil from what you owe the United States. In other words, you pay the difference. Apple just has the sweetheart deal in Ireland where they basically pay nada, so they would have to pay close to the full rate to repatriate.