In its spring assessment of the Irish economy on Wednesday, the European Commission included a well-rehearsed warning on the significant concentration of corporate tax revenue in a relatively small number of large pharmaceutical and IT multinationals. Brussels added a more pointed remark on how small this number is: “This exposes Ireland’s public finances to the profitability and decisions of a few individual companies, changes in the US trade and tax policies and in the international tax environment.” Exchequer figures released by the Department of Finance this Thursday confirm this. May is the month when Microsoft, one of the top three…