The European Commission says itÂ’s not sure how Ireland is raising so much money in corporation tax.

It says it still needs to figure out exactly while the corporate tax take is 60 per cent higher this year than in 2014.

Inspectors from Brussels have finished their fourth post-bailout visit to assess the strength of the Irish economy.

Its report is broadly positive, but warns that banks are still burdened with non-performing loans - and says it canÂ’t explain why the corporate tax take is as high as it is.