The principle
Resolution redistributes losses by administrative decision rather than judicial process. NCWO is the constitutional counterweight: measured claim by claim, the outcome for every affected shareholder and creditor must be no worse than a hypothetical liquidation of the whole bank under national insolvency law at the moment of resolution.
Valuation 3
Compliance is tested after the fact by an independent valuation — known as valuation 3 — that reconstructs the counterfactual insolvency. If it finds a creditor class worse off, the difference is paid as compensation from the resolution financing arrangement, not by reversing the resolution. In the Banco Popular case, the valuation concluded that no compensation was due.
Why it matters for investors
NCWO makes the national creditor hierarchy the anchor of resolution economics: where a claim ranks in insolvency defines the worst outcome resolution may lawfully impose on it. It is also the legal reason harmonised layers such as senior non-preferred debt exist — clean subordination reduces the risk that bailing in one class breaches the safeguard.