Basel's 1,250% rule could freeze US banks out of Bitcoin!

Six Republican senators fired a May 27 letter at the Fed, FDIC, and OCC warning that Basel's 1,250% risk weight on Bitcoin functions as a de facto ban on bank balance-sheet exposure — even as Congress advances legislation to formally open digital asset markets to traditional finance. Under the current rule, a bank holding $100 million in BTC must hold $100 million in capital against it. At a 12% internal CET1 target, that climbs to $150 million, requiring roughly $18 million in annual net profit just to clear a 12% ROE hurdle — economics that custody, trading, and client-service revenue rarely support.

Why it matters

The Senate Banking Committee advanced the CLARITY Act on May 14 by a 15-9 vote, which would give banks a statutory role in digital asset markets. But the senators argue that legislative permission without capital relief is a permission slip banks cannot afford to use. All three regulators have already moved toward crypto permissiveness in 2025 — the OCC reaffirmed custody rights in March, the FDIC dropped its prior-approval requirement, and the Fed withdrew its crypto guidance in April — yet none touched the Bitcoin capital question. The senators found their sharpest argument in a March 2026 interagency FAQ holding that tokenized securities should receive the same capital treatment as their non-tokenized equivalents, pressing regulators to extend that technology-neutral logic to native digital assets like BTC.

Market impact

If regulators adopt a calibrated 100%-300% risk-weight band, capital required on $100 million of Bitcoin exposure could fall from the current $100M-$150M range to $8M-$36M — making bank market-making, prime brokerage, and structured crypto products economically viable.