The official EU directive would be unveiled in the "coming weeks," according to the minister.

Amazon, Apple, Google, Facebook and other tech giants have been accused of using legal tricks to avoid paying taxes in European countries, such as routing profit through Ireland or even the British island of Jersey. A tax on revenue theoretically closes that loophole by collecting money where it's earned (i.e. from the customers), rather than where it's kept.

It's doubtful that tech companies will accept any revenue tax without a fight, as they've maintained that their current financial arrangements are legal. Ireland has also objected to EU tax claims, to no one's surprise -- it directly benefits from companies doing business on its soil through those incentives. However, a relatively low tax rate could reduce objections within the EU nations themselves and make it more a matter of how much companies pay than whether they pay something at all.