OCC Interpretive Letter 1186: Advanced Guide to Bank Crypto Asset Holdings and Gas Fee Implications

On November 18, 2025, the Office of the Comptroller of the Currency issued Interpretive Letter 1186, confirming that national banks may hold crypto assets on their balance sheets as principal and pay blockchain network fees — commonly known as gas fees — as an activity incidental to the business of banking. This landmark guidance opens new operational pathways for financial institutions engaging with blockchain networks and carries significant implications for the broader cryptocurrency ecosystem.

The Objective

Interpretive Letter 1186 addresses a practical challenge that banks face when interacting with blockchain networks: every onchain transaction requires payment of network fees in the native cryptocurrency of that blockchain. Ethereum transactions require ETH, Solana transactions require SOL, and so on. Until now, banks lacked clear regulatory authority to hold these crypto assets directly, forcing them to rely on third-party intermediaries for fee payment — introducing counterparty risk and operational complexity.

The OCC’s guidance establishes that national banks may permissibly hold sufficient crypto assets to pay blockchain network fees in anticipation of paying such fees. The letter also confirms that banks may receive crypto assets when serving as validator nodes on blockchain networks, facilitate blockchain transactions for customers, and test crypto-asset platforms — all as incidental activities under 12 U.S.C. 24 (Seventh), which grants national banks incidental powers to carry on the business of banking.

This is not a theoretical exercise. Banks are already exploring validator operations, tokenized asset settlement, and blockchain-based payment corridors. Interpretive Letter 1186 provides the legal clarity needed to operationalize these activities without regulatory uncertainty.

Prerequisites

Understanding this guidance requires familiarity with several regulatory and technical concepts. The OCC’s authority derives from the National Bank Act, which defines permissible banking activities and their incidental powers. An activity qualifies as incidental when it is convenient or useful in four ways: it facilitates banking products, enhances sales ability, improves efficiency, or enables the bank to use required capacity to avoid economic waste.

On the technical side, gas fees are the mechanism by which blockchain networks prioritize and process transactions. When a bank submits a transaction to Ethereum — whether settling a tokenized deposit, executing a smart contract, or transferring a digital asset — it must pay a fee denominated in ETH. The fee amount fluctuates based on network congestion and transaction complexity, requiring banks to maintain a working balance of crypto assets.

The OCC emphasized that this letter was issued in response to a specific bank’s request, not on the agency’s own initiative. The requesting bank demonstrated how its risk and compliance processes would support safe and sound operations, establishing a template that other institutions can follow.

Step-by-Step Walkthrough

Step 1: Legal Authorization Assessment. Banks must determine which crypto-asset activities they intend to pursue and confirm that each falls within permissible banking activities. The OCC letter identifies four categories: paying network fees, receiving fees as a validator, facilitating customer transactions, and testing platforms. Each category requires a separate operational and compliance assessment.

Step 2: Risk Framework Development. The OCC acknowledges that crypto assets pose risks through price volatility and cyber threats. Banks must develop risk management frameworks that address market risk from crypto price fluctuations, operational risk from key management and custody, cybersecurity risk from wallet and key exposure, and compliance risk from anti-money laundering and sanctions requirements.

Step 3: Custody and Key Management. Holding crypto assets as principal requires robust custody solutions. Banks must implement multi-signature wallets, hardware security modules for key storage, cold storage for the majority of holdings, and hot wallets with strict transaction limits for operational needs. The amount held should be limited to what is reasonably necessary for anticipated fee payments.

Step 4: Operational Integration. Banks need to integrate blockchain fee payment into their existing treasury management systems. This includes real-time monitoring of gas prices across target networks, automated replenishment of crypto asset balances, accounting treatment that properly categorizes crypto holdings, and audit trails for all crypto asset movements.

Step 5: Regulatory Reporting. Crypto asset holdings must be reported on Call Reports and Thrift Financial Reports. Banks should work with their examiners to determine the appropriate reporting treatment and ensure that holdings are transparently disclosed to regulators.

Troubleshooting

Several practical challenges are likely to emerge. First, determining the appropriate amount of crypto assets to hold requires forecasting network fee expenses, which can vary dramatically. During periods of high network congestion, gas fees on Ethereum can spike by orders of magnitude. Banks should maintain conservative estimates and establish protocols for rapid replenishment when balances fall below threshold levels.

Second, accounting standards for crypto assets held for operational purposes remain evolving. Unlike crypto assets held for investment or trading, assets maintained for fee payment have a distinct operational purpose that may warrant different accounting treatment. Banks should consult with their external auditors early in the implementation process.

Third, inter-agency coordination is essential. While the OCC oversees national banks, the Federal Reserve and FDIC have their own supervisory frameworks. Banks should engage with all relevant regulators to ensure consistent expectations across the supervisory landscape.

Fourth, the OCC’s guidance is permissive, not mandatory. Banks that choose to hold crypto assets must demonstrate that they can do so safely and soundly. Institutions without the technical expertise or risk management infrastructure should consider partnering with qualified custodians before building internal capabilities.

Mastering the Skill

Interpretive Letter 1186 represents a significant step in the integration of traditional banking and blockchain infrastructure. With Bitcoin trading at approximately $92,949 and Ethereum at $3,123 on the day of issuance, the cryptocurrency market’s maturity and institutional adoption make this regulatory clarity both timely and necessary.

Banks that develop expertise in crypto asset management for operational purposes will be well-positioned as blockchain-based financial services expand. The ability to pay gas fees directly, serve as validator nodes, and facilitate customer transactions onchain creates competitive advantages that will compound as tokenized assets, decentralized finance protocols, and blockchain-based payment systems gain mainstream adoption.

The key insight is that the OCC framed crypto asset holdings not as a new banking activity but as an extension of existing banking powers — comparable to holding foreign exchange for customer transactions. This framing suggests that future guidance may continue to expand permissible crypto activities under the same incidental powers framework, providing a gradual but steady path toward full integration of banking and blockchain operations.

Disclaimer: This article is for informational purposes only and does not constitute financial, legal, or investment advice. Always conduct your own research and consult qualified professionals before making any investment or regulatory decisions.