The allocation of MEPs from Ireland increased from 11 to 13; however, this change would not take effect until the United Kingdom has left the EU, which took place on 31 January 2020.

As the United Kingdom was still a member of the EU at the beginning of the 2019–2024 parliamentary term, the allocation of seats will remain as it was in the previous parliament, until its withdrawal becomes legally effective.

[9] It also provided for the situation that Ireland's representation remained at 11 with an amendment to the rules, "For the purpose of the European elections held in the year 2019, the return made by the chief returning officer […] shall declare that the last candidate deemed to be elected […] in each of the constituencies of Dublin and South as specified in the Third Schedule, shall not take up their seats in the European Parliament until such time as a date has been specified by the Parliament for the taking up of such seats".

[10] Taoiseach Leo Varadkar had incorrectly suggested that the votes would be counted twice in the constituencies which had an increased number of seats, to account for either contingency.

However, Minister for Housing, Planning and Local Government Eoghan Murphy later clarified that there would be only one count for each constituency, and that the final candidate to be deemed elected in Dublin and South would not take their seats until the withdrawal of the United Kingdom.