I am informed by the Revenue Commissioners that the only relevant basic data available to them from which information of the type requested by the Deputy could be derived are income distribution statistics of individuals on income tax records for the years in question.
The comparable percentages of overall tax liability borne by the 10 per cent of individuals on tax records with the lowest total income (including individuals with zero total income) and the 10 per cent with the highest total income are estimated as follows for each of the years from 1985-86 to 1993-94 (the latest year for which relevant detailed data are available).