Businesses established in Northern Ireland who incur VAT on goods in the EU, and EU businesses who incur VAT on goods in Northern Ireland, will be able to recover this VAT through the electronic cross-border refund system. This enables a business to recover that VAT directly from that country (the UK or EU member state of refund) provided that it is not established in the country of refund and makes no supplies there.
Source: michaelamerz.org