Six U.S. senators on June 4 disclosed a May 27 letter to the Federal Reserve, FDIC, and OCC demanding regulators revisit the Basel Committee's 1,250% risk weight applied to bank-held crypto assets. The rule, which took effect January 1, 2026, requires banks to hold capital equal to 100% of their ...
"The Basel rules currently label Bitcoin as a toxic asset." — Conner Brown, Managing Director, Bitcoin Policy Institute
Six U.S. senators on June 4 disclosed a May 27 letter to the Federal Reserve, FDIC, and OCC demanding regulators revisit the Basel Committee's 1,250% risk weight applied to bank-held crypto assets. The rule, which took effect January 1, 2026, requires banks to hold capital equal to 100% of their crypto exposure — a treatment originally designed for the most opaque securitization tranches. Critics argue it functions as a de facto prohibition on bank participation in digital asset markets at a moment when institutional demand is accelerating and competing regulatory frameworks are emerging globally.
The challenge arrives at a critical juncture. The Fed voted 6-1 on March 19 to advance a comprehensive overhaul of U.S. bank capital requirements. The Basel Committee itself is conducting an expedited review of its crypto standard, with results expected later in 2026. Meanwhile, 150+ publicly traded companies hold over 1.1 million bitcoin worth $78 billion in corporate treasuries, and the institutional crypto custody market — projected at $1.83 billion in 2026 — is growing at a 29.4% CAGR. The gap between market reality and regulatory treatment is widening.
The Basel Committee on Banking Supervision's SCO60 standard, finalized in 2022 and implemented January 1, 2026, classifies crypto assets into two groups. Group 2b — which includes Bitcoin, Ether, and most unbacked crypto assets — receives a 1,250% risk weight, the highest in the entire Basel framework.
The arithmetic is straightforward. A 1,250% risk weight multiplied by the 8% minimum capital ratio produces a capital requirement equal to 100% of the exposure. A bank seeking to hold $100 million in Bitcoin on its balance sheet must set aside $100 million in capital — before adding any counter-cyclical buffers, G-SIB surcharges, or internal capital targets. In practice, the total capital consumed exceeds the value of the asset itself.
This treatment was originally designed for equity tranches of securitizations — instruments where the underlying risk is opaque, cash flows are uncertain, and loss-given-default approaches 100%. The Basel Committee applied the same weight to crypto assets on the rationale that unbacked digital assets carry "unique risks" including volatility, custody risk, and technological uncertainty.
The implementation date was deferred by one year from the original January 2025 target, after the Basel Committee acknowledged that member jurisdictions needed additional time to transpose the standard into national law.
On June 4, 2026, Senate Banking Subcommittee on Digital Assets Chair Cynthia Lummis (R-WY) and Senator Dan Sullivan (R-AK) led four colleagues — Senators Bill Hagerty (R-TN), Bernie Moreno (R-OH), Ted Budd (R-NC), and Jon Husted (R-OH) — in a letter to three federal regulators: Federal Reserve Vice Chair for Supervision Miki Bowman, FDIC Chairman Travis Hill, and Comptroller of the Currency Jonathan Gould.
The letter made three core demands:
Technology neutrality. Capital frameworks should evaluate risk based on the characteristics of the asset, not the technology used to record ownership. A tokenized Treasury bond should not carry higher capital requirements than a traditionally settled one.
Proportional treatment. The 1,250% risk weight is "so extreme that it amounts to a de facto ban" on banks holding digital assets on their balance sheets at scale. The senators requested regulators develop capital rules proportionate to actual, measurable risk.
Proactive rulemaking. Rather than waiting for comprehensive market structure legislation to pass, the agencies should begin developing on-balance-sheet capital frameworks for digital assets now, building on recent progress with tokenized securities and deposits.
The letter's timing was deliberate. The Senate is currently debating the CLARITY Act, which would establish jurisdictional boundaries between the SEC and CFTC for digital asset regulation. The senators' argument: capital rules that prohibit bank participation undermine the legislative framework before it can function.
The Basel standard does not treat all crypto assets equally. The classification determines capital treatment:
Group 1a — Tokenized Traditional Assets. These receive risk weights equivalent to their traditional counterparts. A tokenized government bond receives the same treatment as a physical bond. This category is designed to be technology-neutral.
Group 1b — Stablecoins. Qualifying stablecoins — those backed by liquid reserve assets with reliable redemption mechanisms — receive modified treatment. The Basel Committee removed the basis risk test for Group 1b assets in its July 2024 amendments but retained the redemption risk test. Capital requirements are materially lower than Group 2 but include supervisory add-ons.
Group 2a — Crypto Assets Meeting Hedging Criteria. Assets that meet hedging recognition criteria receive a risk weight below 1,250% but still face restrictive treatment.
Group 2b — All Other Crypto Assets. Bitcoin, Ether, and most major crypto assets fall here. Risk weight: 1,250%. Additionally, Group 2 exposures are subject to a bank-level cap of 2% of Tier 1 capital, with a 1,250% surcharge triggered at 1%.
The practical effect: a bank with $50 billion in Tier 1 capital can hold a maximum of $1 billion in Group 2 crypto assets before triggering the punitive surcharge. For the largest U.S. banks — with Tier 1 capital ranging from $150 billion to $250 billion — the absolute cap is higher, but the capital cost per dollar of exposure makes large allocations economically irrational.
Consider a mid-size U.S. bank with $20 billion in Tier 1 capital evaluating a $200 million Bitcoin custody position held on balance sheet:
| Component | Calculation | Capital Required | |---|---|---| | Base risk weight (1,250%) | $200M × 1,250% × 8% | $200M | | Counter-cyclical buffer (~1%) | $200M × 1,250% × 1% | $25M | | Stress capital buffer (~2.5%) | $200M × 1,250% × 2.5% | $62.5M | | Total capital consumed | | ~$287.5M |
The bank must set aside approximately $287.5 million in capital to hold $200 million in Bitcoin — a 144% capital-to-exposure ratio. By comparison, holding $200 million in investment-grade corporate bonds at a 100% risk weight requires approximately $23 million in capital, an 11.5% ratio.
The economics are unambiguous. No rational bank treasurer will allocate capital at a 144% ratio when the same capital deployed in traditional assets generates returns at 12x lower capital cost.
The Bitcoin Policy Institute published a paper in February 2026 — "Basel's 1250% Mistake" — arguing the risk weight represents a fundamental classification error. The core argument: the 1,250% weight was designed for instruments with opaque risk profiles and uncertain recovery values. Bitcoin, the paper contends, has none of these characteristics.
Specifically, the paper noted:
The paper recommended a three-phase approach:
Immediate: Clarify that pure agency custody — where the bank holds crypto on behalf of clients without taking balance sheet exposure — should be capitalized under the operational risk framework, not SCO60.
Medium-term: Replace the fixed 1,250% risk weight with a conservative FRTB-based market risk approach (the same framework used for trading book exposures to commodities and equities) plus operational risk add-ons.
Long-term: Create a new "non-issuer digital commodity" category with risk-based capital calibrated to empirical data on volatility, liquidity, and custody risk.
The Basel 1,250% challenge is not occurring in isolation. Multiple regulatory actions are converging simultaneously:
Basel Committee Review. In February 2026, the Basel Committee announced it had "expedited a targeted review of elements of its cryptoasset standard," with an update expected later in 2026. The review was prompted by "recent cryptoasset market developments" — likely referencing the growth in spot ETFs, institutional custody demand, and the expanding use of tokenized deposits.
Fed Basel III Endgame. On March 19, 2026, the Federal Reserve, OCC, and FDIC jointly issued three proposals overhauling U.S. bank capital requirements. The Fed voted 6-1 to advance (Governor Michael Barr dissenting). The proposals would reduce aggregate CET1 capital requirements for Category I and II banks by 4.8%, for Category III and IV banks by 5.2%, and for smaller banks by 7.8%. Comments are due June 18, 2026. The proposals leave open how final rules will treat digital asset risk weights, creating a narrow window for industry comment on crypto-specific treatment.
SAB 121 Repeal. The SEC rescinded SAB 121 on January 23, 2025, removing the requirement that crypto custodians record customer holdings as balance sheet liabilities. The FDIC subsequently rescinded FIL-16-2022 in March 2025. These removals eliminated the accounting barrier to bank crypto custody — but the Basel capital barrier remains.
CLARITY Act. The market structure bill currently on the Senate floor would define which digital assets are securities and which are commodities. Without workable capital rules, however, the jurisdictional clarity may prove academic for banks that cannot economically hold the assets.
The institutional custody market is growing despite the capital constraints. According to Intel Market Research, the institutional crypto custody market is projected at $1.83 billion in 2026, growing at a 29.4% CAGR to $14.4 billion by 2034. Research and Markets projects the broader crypto custody provider market at $3.69 billion in 2026, reaching $7.74 billion by 2032.
Bank entry is accelerating:
Meanwhile, 150+ publicly traded companies hold over 1.1 million bitcoin worth $78 billion in corporate treasuries, according to the Bitcoin Policy Institute. These holdings generate demand for institutional-grade custody, prime brokerage, and lending — services that banks are structurally positioned to provide but capital-constrained from scaling.
The paradox: regulators have removed the accounting barriers (SAB 121), are building the legislative framework (CLARITY Act, GENIUS Act), and the Basel Committee itself is reviewing its own standard — yet the 1,250% risk weight remains the binding constraint.
The 1,250% risk weight is an artifact of a 2022 regulatory environment in which crypto assets were treated as an undifferentiated category of speculative instruments. Since then, spot ETFs have launched, institutional custody has become a standard service, SAB 121 has been repealed, and the U.S. Congress is legislating market structure. The regulatory infrastructure has evolved; the capital treatment has not.
The next six months are decisive. The Basel Committee's expedited review, the Fed's comment period closing June 18, and the Senate's legislative push on market structure legislation will collectively determine whether U.S. banks can participate in digital asset markets at scale — or whether a capital rule designed for subprime mortgage tranches continues to define the cost of holding Bitcoin.
The outcome is not predetermined. But the direction of regulatory movement — across the Basel Committee, the Fed, and Congress — points toward recalibration. The question is how far and how fast.