Ireland’s economy faces heightened uncertainty as a result of changing U.S. policy that could see its economy grow much more slowly than previously expected and government tax revenue fall sharply, the country’s central bank said.

The operations of U.S. businesses account for a big share of Irish economic output, employment and tax revenue. While they have used Ireland as a low-tax base from which to export to the rest of Europe, many also sell a big share of their production to the U.S.