By Tom Fairless 

BRUSSELS--A high-profile European Union investigation into alleged tax sweeteners for multinationals spread to a fourth country on Tuesday, in a sign of the growing momentum behind the bloc's clampdown on corporate tax avoidance.

EU regulators said they had opened a formal probe into whether the tax code in Belgium gives an unfair tax break to multinational groups that isn't available to other firms.

Margrethe Vestager, the EU's antitrust czar, said that the Belgian tax scheme may constitute "a serious distortion of competition unduly benefiting a selected number of multinationals."

The EU's tax probes have already ensnared four multinationals in three European countries-- Apple Inc. in Ireland, Amazon.com Inc. and Fiat SpA in Luxembourg and Starbucks Corp. in the Netherlands. The companies could face back-tax demands worth hundreds of millions of dollars if regulators' suspicions are confirmed. All companies have denied receiving special treatment.

The investigation has focused on tax rulings, which are used to confirm the size of companies' future tax bills, in order to give certainty as to future outgoings. The European Commission, the bloc's Brussels-based executive arm, suspects some tax rulings may have granted certain companies an advantage over others, which would be illegal under EU law.

This time, the concerns center on a provision in Belgian tax law that allows companies to deduct so-called "excess profits" from their tax bills. These are profits that result from the advantage of being part of a multinational group.

"The Belgian 'excess profit' tax system appears to grant substantial tax reductions only to certain multinational companies that would not be available to stand-alone companies," Ms/ Vestager said.

The commission said in December it would ask all 28 EU governments to provide a full list of companies that received an advance tax ruling between 2010 and 2013.

Write to Tom Fairless at tom.fairless@wsj.com

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