SEC Staff Accounting Bulletin 121: Crypto Custody Impact

SAB 121: How SEC Accounting Guidance Transformed Crypto Custody

SEC Staff Accounting Bulletin No. 121, issued in March 2022, fundamentally altered the economics of cryptocurrency custody for regulated financial institutions. The guidance, which requires entities to recognize both an asset and liability for customer crypto holdings on their balance sheets, created significant challenges for banks and other institutions seeking to offer digital asset custody services.

Understanding SAB 121 Requirements

SAB 121 addresses accounting treatment for obligations to safeguard crypto-assets held for platform users. The guidance applies to entities that provide custodial services for cryptocurrencies, including banks, broker-dealers, and other financial institutions.

Core Accounting Treatment:

• Recognize a liability equal to the fair value of crypto-assets held for platform users
• Recognize a corresponding asset at the same fair value
• Remeasure both the asset and liability at each reporting date
• Disclose the nature and amount of crypto-assets held

The liability reflects the obligation to return crypto-assets to customers. The asset represents the safeguarding asset that would be used to satisfy the liability. This differs dramatically from traditional custody accounting where custodied assets remain off-balance sheet because the custodian has no ownership interest.

Rationale for On-Balance Sheet Treatment

The SEC staff justified SAB 121 based on unique risks associated with crypto-asset custody:

Technological Risks: Private key management presents novel security challenges. Loss or theft of keys results in permanent, irreversible loss of assets, unlike traditional securities that can be replaced through legal process.

Legal Uncertainties: The treatment of custodied crypto-assets in bankruptcy remains unclear. Platform users may be treated as unsecured creditors rather than owners of segregated assets, as demonstrated in various crypto bankruptcy proceedings.

Operational Risks: The nascent nature of blockchain technology creates operational risks not present in traditional custody, including protocol vulnerabilities, network attacks, and smart contract failures.

These factors led staff to conclude that crypto-asset custody obligations differ materially from traditional custody and warrant different accounting treatment that reflects the associated risks on the balance sheet.

Impact on Financial Institutions

SAB 121 created substantial obstacles for banks and other regulated financial institutions considering crypto custody services.

Capital Requirements: On-balance sheet liabilities require regulatory capital. For banks, this means holding capital against custodied crypto-assets that would not be required for traditional custody. The capital charge dramatically increases the cost of providing crypto custody services.

Balance Sheet Constraints: Adding potentially billions in crypto-assets to balance sheets affects financial ratios, leverage calculations, and regulatory metrics. Institutions face practical limits on custody capacity based on balance sheet capacity.

Risk Management: Balance sheet recognition triggers risk management frameworks typically applied to owned assets. Institutions must incorporate custodied crypto into stress testing, concentration limits, and risk reporting.

Industry Response

The financial services industry strongly opposed SAB 121, arguing it would prevent banks from offering crypto custody and push customers toward less regulated alternatives.

Banking Industry Concerns:

• Creates artificial competitive disadvantage versus non-bank custodians
• Punishes banks for custody risk management that actually protects customers
• Contradicts policy goals of bringing crypto into regulated financial system
• Applies different standard than traditional securities custody

Congressional Response: Congress passed legislation in 2024 to overturn SAB 121, but the measure was vetoed. The bipartisan support for the legislation demonstrated widespread concern about the guidance effects on crypto market development.

Practical Implications for Crypto Custody

SAB 121 shaped the crypto custody landscape in several ways:

Bank Custody Delays: Major banks that had announced crypto custody plans paused or scaled back initiatives. The economics of balance sheet recognition made custody services unprofitable at competitive pricing.

Non-Bank Dominance: Crypto-native custodians not subject to bank regulatory capital requirements gained competitive advantage. This concentrated custody in firms with potentially weaker regulatory oversight.

Structuring Approaches: Some institutions explored structures attempting to avoid SAB 121 application, including:

• Custody through non-consolidated subsidiaries
• Partnership arrangements with existing crypto custodians
• Customer self-custody with limited institutional involvement
• Custody of tokenized traditional assets rather than native crypto

2025 Developments and Potential Relief

The regulatory environment for crypto custody has shifted with changes in SEC leadership and policy direction.

SEC Staff Reconsideration: The SEC Crypto Task Force has indicated willingness to reconsider SAB 121 as part of broader efforts to facilitate institutional crypto participation. Discussions have focused on:

• Modified accounting treatment for qualified custodians
• Recognition of customer asset segregation arrangements
• Risk-based approach to balance sheet recognition
• Alignment with traditional custody accounting principles

Bank Regulatory Coordination: Banking regulators have engaged with the SEC on custody accounting treatment, recognizing the interconnection between accounting rules and prudential supervision of bank crypto activities.

Compliance Considerations

Entities currently providing or considering crypto custody services must navigate the existing SAB 121 framework while monitoring potential changes.

Current Requirements:

• Apply SAB 121 accounting for crypto-asset custody obligations
• Maintain appropriate disclosures about custodied assets
• Calculate capital requirements based on balance sheet recognition
• Document rationale for any positions that SAB 121 does not apply

Planning Considerations:

• Monitor SEC guidance for potential modifications
• Evaluate custody structures that may receive different treatment
• Consider phased custody service rollout pending regulatory clarity
• Engage with regulators on custody arrangements

Institutional Custody Alternatives

Given SAB 121 constraints, institutions have pursued alternative approaches to participate in crypto markets:

Exchange-Traded Products: Banks can offer exposure to crypto through ETFs and similar products without triggering SAB 121 custody obligations for the underlying assets.

Sub-Custody Arrangements: Partnering with specialized crypto custodians allows banks to offer crypto services without directly holding customer assets on balance sheet.

Tokenized Traditional Assets: Custody of blockchain-based representations of traditional securities may not implicate SAB 121, providing a path to blockchain technology participation.

Looking Forward

SAB 121 remains a significant factor in institutional crypto adoption, but the regulatory landscape continues to evolve. Key questions include:

• Whether SEC staff will issue modified guidance or withdraw SAB 121
• How banking regulators will treat crypto custody in supervisory frameworks
• Whether Congress will successfully pass legislation addressing crypto custody accounting
• How market structures will adapt to the current or modified regulatory framework

Institutions should monitor these developments while making strategic decisions about crypto custody participation based on current rules and reasonable expectations for regulatory evolution.