Microsoft Corp., the world’s biggest software maker, is among companies embroiled in a European Union inquiry into Luxembourg’s tax treatment of multinational firms, according to three people familiar with the EU’s [...]

A coalition of European and American trade unions has accused McDonald’s of skirting European taxes after the company altered the way it channels royalty payments from its restaurants in 2009. In a report released Wednesday, the group said the world’s largest restaurant chain avoided paying 1.06 billion euros [...]