In the past week, there’s been discussion of how the U.S. Senate’s tax bill could affect every sector of the country’s economy. But the tech industry needs to think about more than just the bill’s national repercussions.

Tech’s biggest companies—including Twitter, Google and Apple—are all multinational, with European headquarters in Ireland. The country has long lured American tech companies with its low corporate tax rate of 12.5 percent and several have been accused of using Irish subsidiaries to avoid large non-U.S. revenue taxes. Now, there are thousands of American tech employees in Ireland, working in offices along Dublin’s Silicon Docks.