rec_6
(6) As a rule, prefixes of VAT identification numbers in the Union are based on ISO code 3166 – alpha 2 – by which the Member State of issue may be identified. Northern Ireland has no specific code under that system, but the ISO foresees the possibility to use X-codes for territories that do not have a specific code. Therefore, it is appropriate to propose the code ‘XI’ for Northern Ireland.
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Source: EUR-Lex (Cellar) · retrieved 2026-10-14 · Text as adopted (Official Journal); later amendments are not incorporated in this text.