The investigation could lead to fines and eventually cause Amazon to change the way it works.
It’s the third time the commission has slapped Google with an antitrust penalty.
The move could add to a brewing trade war between Brussels and Washington.
Europe's antitrust chief is expected to hit Google on Wednesday with anti-competitive charges concerning its Android mobile
So-called "profit-shifting" arrangements help companies avoid paying tax in countries where they do business, by making it look as though they made their profits somewhere else. And it's those who play fair -- those who can't or, out of principle don't, move their income around the world -- who end up paying the price.
Despite a looming uphill battle, EU commissioner Margrethe Vestager says corporate support is restoring hope.
"What we're aiming for has nothing to do with Google as such -- it has to do with the market allowing innovation."
Turns out she's just like the rest of us.
Google Antitrust Case: Can European Institutions Do Anything Other Than Investigate U.S. Tech Companies?
As a true believer in a unified Europe, I dream a continent willing to invest in future generations and ready to support all viewpoints -- a diversity that reinforces a common vision and builds fair opportunities for all European citizens.