A Post-Budget 2016 Ready Reckoner is available on the Revenue Statistics webpage at http://www.revenue.ie/en/about/statistics/index.html.
In relation to the Deputy's question, this Ready Reckoner shows a wide range of detailed information, including, on Page 6, the estimated cost to the Exchequer of changes to the earned income tax credit.
All figures provided in the Ready Reckoner are estimates for 2016 incomes from the Revenue tax forecasting model using latest actual data for the year 2013, adjusted as necessary for income, self-employment and employment trends in the interim. They are provisional and may be revised.