Don't take my word for it. Those figures (from 2012) came from the revenue commissioners. I'm sure you could find more up to date ones on their website.That is not 'indisputable fact'. It is an ongoing con.
No, the revenue know exactly how much the declared income is, and what deductions and allowances people claim.How it works is that lobbyists for this sector simply come up with a 'provisional' figure for tax income from that section of the community as if they were all paying tax at the higher levels and never, ever look at how much that cohort claim back.
Do you have some examples? My memory of 'offshore investment funds' was that in the past many of these were used illegally to avoid tax. That is a different situation altogether.If tax loopholes are created in order to increase investment in an economy, then why are many of the tax loopholes irretrievably tied in with 'offshore' investment funds?