Imports to the Republic of Ireland from Northern Ireland are up 77% since the UK left the EU, according to the Irish Central Statistics Office (CSO).
In the first six months of 2021, the value of imported goods was around €1.77 billion, compared with just under €1 billion in the same period last year.
Exports from the Republic were also up, from €1.1 billion to €1.57 billion.
Goods moving between the Republic of Ireland and Northern Ireland are not currently subject to customs checks, as Northern Ireland is still in effect within the EU single market.
By contrast, goods moving between Great Britain (England, Scotland and Wales) and EU countries must be declared.
Exports from the Republic of Ireland to Great Britain rose 20% to €6.7 billion in the same period.
Exports from Great Britain to Northern Ireland fell 32% to €5.3 billion. Food, livestock and manufactured goods were the hardest hit.
Header image: Rory McKeever