Question to the HM Treasury:

To ask the Chancellor of the Exchequer, if the Government will make an estimate of the amount of money that the EU has spent on the (a) Republic of Ireland and (b) island of Ireland to date; and if he will make an estimate of the amount of money the UK has contributed to those bodies that formed part of that spending.

This question was answered on 4th February 2019
The government contributes to the EU budget as a whole and not to individual member states or funds, therefore it is not possible to separate UK funding which has been allocated to the Republic of Ireland or the island of Ireland through the EU budget. The Commission does however publish details of receipts to each Member State which can be found online at: http://ec.europa.eu/budget/figures/interactive/index_en.cfm

An overview of EU funding to Northern Ireland can be found online at: https://ec.europa.eu/unitedkingdom/news/eu-funding-northern-ireland-0_en