Capital Requirement means a rule governing the amount and quality of capital relative to a bank’s risks or the size of its positions, such as loans and investments. A capital ratio compares that capital with the relevant calculation base. For a bank dealing with BTC, the activity, jurisdiction and period matter; one percentage does not describe the whole regime.
Jane reads that a bank has strengthened its capital and pictures more cash in a vault. But capital is not a separate pile of banknotes. The European Central Bank, or ECB, explains it as funding that helps protect against losses. It includes, for example, money raised from shareholders and profits the bank has retained. Customer deposits, in contrast, are debts owed to customers. A loss on an unpaid loan or the bank’s own BTC position can reduce capital. Its purpose is to help the bank withstand a loss, not to suggest that losses cannot happen. [1]
RBC20 sets basic minima against RWA, meaning risk-weighted assets: CET1 of 4.5%, Tier 1 of 6% and total capital of 8%. CET1 is the highest-quality core capital, notably eligible common shares and retained earnings. Tier 1 includes it plus other eligible capital able to absorb losses while the bank continues operating. Total capital additionally includes eligible supplementary capital. These are requirements for nested categories, not three rates to add. The bank must satisfy all of them at once, using capital after the prescribed regulatory adjustments. [2]
RWA are not just the sum of the accounting values of a bank’s assets. They are a calculation base that reflects risk under specified methods. Credit risk includes a borrower failing to pay; market risk concerns price movements; operational risk includes failures of processes, people or systems. The rules turn these areas into a common measure for calculating capital. Two banks with equally large asset totals can therefore have different RWA. For BTC, the bank’s actual position and its regulatory classification matter; the number of coins alone does not settle the question. [2]
In our own model, a bank has USD 100 million in RWA and USD 10 million in total regulatory capital. Its ratio is 10%. The basic requirement of 8% corresponds to USD 8 million, leaving a difference of USD 2 million. That difference is not automatically distributable to shareholders. The example leaves out other requirements and does not examine capital composition. Even an adequate total ratio can coexist with insufficient capital in a required higher-quality category. Jane should read the result as an illustration of the calculation, not proof of spare money or compliance with every rule. [2]
In European supervision, the ECB distinguishes the basic Pillar 1, an additional Pillar 2 Requirement for a particular bank’s risks, and capital buffers. These buffers are further capital requirements, not accounting estimates of future expenses. Pillar 2 Guidance is a separate supervisory expectation for periods of stress; it is not the same legal category as a binding requirement. Both requirements and expectations matter when assessing a bank, but they must not be confused. For an institution dealing with BTC, Jane therefore needs the actual supervisory decision and applicable regime. A universal add-on guessed from a news report is not enough. [1]
The leverage ratio does not use risk weights. The ECB describes it as Tier 1 divided by the relevant total exposure measure, including off-balance-sheet items. Those include certain commitments that do not appear as ordinary assets on the balance sheet. The aim is to constrain excessive positions relative to capital even when a risk-based calculation looks favourable. The basic European minimum is 3%, not another 3% of the same RWA. The denominator differs, and an individual bank may face further requirements. [3]
A bank can own BTC, trade an instrument linked to its price, or provide custody for customers. These do not automatically create the same exposures. SCO60, in the cited version for 2026, applies a 1250% risk weight to Group 2b and also imposes a limit on the second group relative to Tier 1 capital. But a risk weight is not directly a capital requirement rate. Customer custody likewise differs from the bank’s own investment, while still creating risks such as operational and legal risk. Only after identifying the activity and local rules can its capital treatment be assessed meaningfully. [4]
Jane now knows to read the date, asset quality and reporting scope alongside the ratio. A consolidated figure covers the relevant group of companies; it need not describe only the bank with which she signed a contract. On its own it proves neither liquidity, meaning the ability to meet obligations on time, nor access to customer BTC or immunity from failure. Actual losses and how they develop also matter. A capital requirement helps contain risk, but cannot replace an assessment of the whole bank or verification of custody security. [1]
For the clearest picture, read this entry together with Basel Crypto Standard, Financialization, Credit risk. The reverse links also lead from Basel Crypto Standard, Financialization.