Apple Inc will open a new campus as part of a five-year, $30 billion US investment plan and will make about $38 billion in one-time tax payments on its overseas cash, one of the largest corporate spending plans announced since the passage of a tax cut signed by US President Donald Trump.

The company has been under increasing pressure to make US investments since the 2016 presidential campaign, when Trump targeted the iPhone maker for making products in Asian factories.

While Apple has announced no plans to change that practice and experts say it would be economically impractical to make iPhones in the United States, the company has begun to emphasise its US economic impact, from developers who sell software on its App Store to the tens of billions of dollars per year it spends with US suppliers.

Between the spending plan, hiring 20,000 people, tax payments and business with US-based suppliers, Apple on Wednesday estimated it would spend $350 billion in the United States over the next five years.

It did not, however, say how much of the plan was new or how much of its $252.3 billion in cash abroad - the largest of any US corporation - it would bring home. In addition to the $38 billion in taxes it must pay, Apple has run up $97 billion in US-issued debt to pay for previous share buybacks and dividends.

Walter Piecyk, managing director for TMT Research at BTIG Research, said he could not yet tell whether the US expansion was an increase from a previous plan or meant investment abroad was being refocused in the United States. Reuters Breakingviews estimated that Apple could have increased US headcount by 24,000 in the last five years.

Trump described the move by Apple as a victory for his efforts.

"I promised that my policies would allow companies like Apple to bring massive amounts of money back to the United States. Great to see Apple follow through as a result of TAX CUTS," Trump wrote on Twitter.

Asked in an interview with ABC News whether the job creation announcements were directly related to the Republican tax plan, Apple Chief Executive Officer Tim Cook gave a measured response.

"Let me be clear: There are large parts of this that are a result of the tax reform, and there's large parts of this we would have done in any situation," Cook said in the interview.

AMAZON VS APPLE

Apple joins Amazon.com Inc in scouting for a location for a new campus. Amazon finished taking applications from cities in October for its second headquarters.

Amazon set off a scramble between cities across the nation to host the headquarters, and Apple's announcement stirred broad interest.

Chicago Mayor Rahm Emanuel told reporters on Wednesday, "We're going to go compete and we're going to put our best foot forward" to compete for an Apple campus. A Philadelphia Department of Commerce spokeswoman said the city would submit a proposal if Apple opened the process for bids.

Apple has not said whether it had settled on a new campus location yet, and it did not make any commitments on the size of new spending or hiring specific to the campus. It did say it would initially house technical support for customers and would announce the location later this year.

The facility would be in addition to its "spaceship" Apple Park headquarters in Cupertino, California; a campus in Austin, Texas, that houses customer service agents and some manufacturing; and an Elk Grove, California, unit with several thousand customer service agents and iPhones refurbishing technicians.

Apple also has built its own data centres in North Carolina, Oregon, Nevada, Arizona and a recently announced project in Iowa, and leases data centre space in other states.

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