What is triangulation?
Many multi-national companies operating across the EU make use of the “triangulation simplification”. This removes the burden to VAT register in different Member States into which goods are delivered.

Under normal EU VAT rules, without the triangulation simplification, Party B (the intermediate supplier) would ordinarily be required to register for VAT in Member State C to account for an intra-Community acquisition. It would then make an onward local supply of goods to its customer, Party C, in Member State C.