Dr. Tom McDonnell:

The answer is that we are getting better at it. The Revenue Commissioners have now started sharing wage data, for example, with the CSO, so we now have access to administrative data. That is much better than the way we used to do it. It is through the PAYE modernisation system. We therefore have good distributional data - at least, the CSO does - and my understanding is that the CSO will share those data, so the data on the distribution of household income, at least through wages, will be available.