By Tom Fairless 

BRUSSELS--European Union regulators delayed decisions on whether four multinational companies including Apple Inc. and Amazon.com Inc. may have benefited from illegal tax sweeteners, citing difficulties in obtaining information to make its case.

In a hearing at the European Parliament, the EU's antitrust chief Margrethe Vestager told lawmakers on Tuesday that her agency "won't meet the deadline we set ourselves [of] the end of the second quarter." She declined to give a new deadline.

The EU has opened a series of high-profile probes in recent months into tax deals struck by four multinationals--Apple in Ireland, Amazon and Fiat SpA in Luxembourg and Starbucks Corp. in the Netherlands. Regulators had pledged to decide by the end of June whether the deals violated EU law--decisions that could be followed by demands for sizable back-tax payments.

All the companies and governments involved have denied breaching EU rules.

The European Commission, the bloc's executive arm, has said the investigations are a priority, despite concerns about a large number of tax rulings benefiting companies while Jean-Claude Juncker, now the commission president, was prime minister of Luxembourg. At a time of austerity in many countries, governments across the continent are seeking to shore up their finances and demonstrate to taxpayers that wealthy multinationals are paying their fair share of tax.

Ms. Vestager attributed the delay to difficulties in obtaining information from the countries involved. "It has become clear that obtaining info is challenging and time consuming," she said.

Luxembourg initially resisted the commission's requests for tax documents and had been fighting the case in court, but the country's prime minister, Xavier Bettel, relented in December after the commission also asked other EU countries to share their tax rulings.

"Obviously fast is better than slow, but better than all is being just," Ms. Vestager said.

Regulators are also examining concerns from trade unions over Luxembourg's tax dealings with McDonald's Corp., she said. "We are looking into the information. to assess if there is a case," she said.

The EU said in December that it would ask all 28 EU governments to provide a full list of companies that received an advance tax ruling between 2010 and 2013. It had previously requested an overview of tax rulings provided by Cyprus, Ireland, Luxembourg, Malta, the Netherlands and the U.K., as well as specific tax rulings in Belgium.

Tax rulings are used to confirm the size of companies' future tax bills, but the commission suspects some may have granted certain companies an advantage over others, which would be illegal under EU law.

Ms. Vestager said three national governments--the Czech Republic, Estonia and Poland--hadn't yet provided the information sought by her agency.

Brussels cannot impose tax policy on the bloc's 28 governments, but regulators are using an EU-wide ban on selective state aid to companies to crack down on individual tax deals that they deem to have given an unfair advantage to certain enterprises.

Ms. Vestager said she wouldn't hesitate to open further investigations if she suspected that the bloc's rules were being violated. "We cannot do every case in the world but we can find cases that we think [are] deeply problematic," she said.

She said she was aware of possible reputational damage for the companies involved and would therefore seek to close the investigations swiftly. But she stressed that she wouldn't "sacrifice quality and justice."

The aim of the investigations, Ms. Vestager added, is to set a precedent that would "inspire" national governments to change legislation to ensure their tax systems are in line with EU rules. That has already happened in Ireland, where the government has announced it would phase out the controversial double-Irish tax loophole, she said.

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

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