By Tom Fairless

BRUSSELS--European Union regulators will explain on Tuesday why they believe that tax deals granted to Apple Inc. (APPL) and Fiat SpA (FIATY) violated EU law, an EU spokesman said.

The European Commission, the EU's central antitrust authority, opened formal investigations in June into whether tax deals granted to Apple in Ireland, Fiat's finance arm in Luxembourg and Starbucks Corp. (SBUX) in the Netherlands amounted to illegal state support for the companies.

The commission will publish its so-called opening decisions in the Apple and Fiat cases on Tuesday, the spokesman said.

The regulator isn't yet ready to publish its opening decision in the Starbucks investigation, which will follow in "a few weeks," he said.

The Dutch letter has been delayed because negotiations with the government over confidentiality are taking longer, he said.

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

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