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Tier 1 capital is the core measure of a bank 's financial strength from a regulator 's point of view. It is composed of core capital, which consists primarily of common stock and disclosed reserves (or retained earnings), but may also include non-redeemable non-cumulative preferred stock.ier 1 capital ratio [edit]. The Tier 1 capital ratio is the ratio of a bank's core equity capital to its total risk-weighted assets (RWA). Risk-weighted assets are the total of all assets held by the bank weighted by credit risk according to a formula determined by the Regulator (usually the country's central bank).
1 Under federal bank regulations, a US bank must have Tier 1 Capital ratio of at least 4%. 2  The US is also considering raising the leverage ratio to 5% (WSJ). 3  UK Regulation The Chancellor has announced that he is likely to support a new regulation which sets bank leverage ratios by 2018 (BBC).