European tax administrations and financial intermediaries

Cum-Ex is often compressed into a story about an ingenious trade or a loophole. That description is too narrow for accountability. The decisive issue was not simply whether shares moved around a dividend date. It was whether a public authority could prove that a refund claimant was entitled to relief, that withholding tax had actually been collected, and that the same payment had not already supported another credit or refund. The trades crossed desks, custodians, clearing systems, funds, banks and borders. The public decision occurred later, in a tax office that frequently saw a certificate and a claim rather than the complete chain. Cum-Ex therefore tests the governance of evidence: who creates it, who may rely on it, who reconciles it, who challenges contradictions and who owns the decision when no single institution sees the whole transaction.