Microsoft Plans to Contest IRS Claim It Owes $28.9 Billion in Back Taxes

A pedestrian carries a Microsoft shopping bag.Photographer: Victor J. Blue/Bloomberg
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Microsoft Corp. will appeal a decision by the US Internal Revenue Service that the software maker owes at least $28.9 billion in taxes related to how it allocated income and expenses among global subsidiaries from 2004 to 2013.

The company said Wednesday in a regulatory filing that it disagreed with the “notices of proposed adjustment” to its federal tax filings and will appeal the decision.