On Wednesday, the Internal Revenue Service (IRS) notified Microsoft that it may owe $28.9 billion in back taxes, plus penalties and interest, from 2004 through 2013. The IRS says it believes that as of Sept. 30, its tax adjustments are correct and will elevate the issue to judicial proceedings, if necessary.
https://gizmodo.com/microsoft-may-owe-28-9-billion-in-back-taxes-to-the-ir-1850921247