I am advised by Revenue that a Pre-Budget 2018 Ready Reckoner is available on the Revenue Statistics webpage at www.revenue.ie/en/corporate/documents/statistics/ready-reckoner.pdf. The statistics contained in this Ready Reckoner are 2018 estimates from the Revenue tax forecasting model using latest actual data for the year 2015, adjusted as necessary for income, self-employment and employment trends in the interim. In relation to the Deputy's Questions, page 3 of the Ready Reckoner shows the information requested on income earners by Income Tax and USC rates in 2018.
Similar information up to 2015 (the most recent year for which tax returns are filed) is available on the Revenue website:
www.revenue.ie/en/corporate/information-about-revenue/statistics/income-distributions/income-earners-it-rate.aspx and
www.revenue.ie/en/corporate/information-about-revenue/statistics/income-distributions/income-earners-usc-rates.aspx.