Around 35 multinationals including brewer Anheuser-Busch InBev NV will be required to pay back around EUR700 million in additional taxes in Belgium after European Union regulators ruled they had benefited from an illegal tax break. The decision by the European Commission, the bloc's top antitrust regulator, is the latest step in a high-profile inquiry into alleged unfair tax deals that has already ensnared at least four U.S. multinationals, including Apple Inc., Amazon.com Inc., McDonald's Corp. and Starbucks Corp. It comes at a sensitive time for Belgium-based AB InBev, which is in the middle of a complicated $108 billion deal to buy the world's second-largest brewer, SAB Miller PLC of London.