The European Union’s antitrust regulator is poised to rule as soon as Tuesday that Apple Inc.’s tax arrangements with Ireland have breached the bloc’s state-aid rules, according to people familiar with the matter.The EU’s decision is likely to aggravate trans-Atlantic tensions over the investigations into tax deals brokered between U.S. multinational corporations and individual European countries. Washington has said the probes unfairly target American companies.In its statement declaring the tax arrangements illegal, the European Commission is expected to name an amount that Apple would need to pay back to Ireland and would likely request Irish authorities to calculate the exact amount. Analysts have said they expect the commission to require Apple to pay back anywhere between $200 million and as much as $19 billion, depending on the EU’s line of argument in its final decision.http://www.marketwatch.com/story/apple-set-to-face...