Other multinationals which do not employ as extreme Irish tax schemes as Apple but shift profits via the country to tax havens could also be breaching EU rules, Competition Commissioner Margrethe Vestager said on Thursday.
She handed the iPhone maker a record 13-billion-euro (10.97 billion pounds) bill for Irish registered units that Dublin authorities accepted were liable to tax in no country on Tuesday.
She told Reuters in an interview that other firms' arrangements, which involve routing profits to Irish registered subsidiaries tax resident in paces like Bermuda, might fall foul of the Commission on similar grounds.
"Taxes have been paid nowhere due to the Irish tax code," she said.
Asked if the bill would have been different if the head office of Apple's Irish unit been registered and paid tax in Bermuda, Vestager said: "not much".
Vestager said the core of the case against Apple was that it had an Irish registered company that booked most of the profits generated across Europe.
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However, since Ireland didn't deem the subsidiary tax resident there, the unit was able to report just a small taxable income at an Irish 'branch'.
Apple's CEO Tim Cook and Washington have denounced the Commission ruling as an unjust raid on tax that should be paid in the United States.
Vestager said if Washington chose to tax the profits reported by Apple's Irish operation, she would reduce her demand accordingly.
The US could do this by forcing Apple to have its Irish units pay more in fees to Apple in California for the right to licence Apple patents.
"If the US tax authority found that the monies paid due to the cost-sharing agreement were too few ... so that they should pay more in the cost-sharing agreement, that would transfer more money to the States and that may change the books and the accounts in the States," Vestager said.
Vestager said, however, that the bill would not be affected if Apple next year moved funds from its Irish units to the United States by paying dividends, even though in this case, the dividends would be taxed.
She declined to discuss which other companies' affairs were being looked at by her staff beyond two publicly announced and outstanding investigations into Amazon and McDonald's in Luxembourg.
She said that since being alerted to Apple's methods and other cases by a US Senate probe in 2013, the Commission has been looking through about 1,000 such instances in the EU.
She dismissed accusations from Apple CEO Tim Cook and others that her decision was politically motivated or driven by anti-American populism. While US companies have been investigated, she said, most of 35 firms probed over tax in Belgium were from Europe, and those still being looked at were a broad sample.