I am advised by Revenue that information in respect of the Research and Development (R&D) tax credit is available at: https://www.revenue.ie/en/corporate/information-about-revenue/statistics/tax-expenditures/r-and-d-tax-credits.aspx. This includes the cost of payable tax credits for each of the relevant years. The most recent year for which returns have been filed is 2018.
It is not possible to accurately predict the yield from ending the payable element of the R&D credit, as information in respect of the future level of the payable credit is not available. This is dependent on both the future profitability of claimant companies as well as their level of qualifying R&D activity.