SAB 122, issued by the SEC on January 23, 2025, rescinded SAB 121 and removed the rule that forced banks custodying crypto to gross up their balance sheets with a matching asset and liability. Banks now apply normal loss-contingency accounting (ASC 450 / IAS 37). Custodied crypto stays off the balance sheet, and the path to bank custody of stablecoins is open.
The change in one paragraph
SAB 121, issued March 2022, required any entity safeguarding crypto assets for customers to recognize both an asset and a corresponding liability on its balance sheet at fair value. For a bank, that gross-up triggered regulatory-capital consequences that effectively made custody uneconomic at scale. SAB 122 rescinds that guidance and tells custodians to apply existing contingency accounting instead: recognize a liability when a loss is probable and reasonably estimable, otherwise disclose.
What banks can hold under SAB 122
SAB 122 is an accounting bulletin. It does not itself enumerate eligible assets. Eligibility for any specific crypto asset still flows through the prudential regulators: OCC for national banks, the Federal Reserve for state member banks, the FDIC for state non-member banks, and state banking departments for state trust charters. Recent OCC interpretive letters have progressively broadened the custody perimeter for crypto assets at national banks.
In practice, post-SAB 122, banks have expanded custody offerings across three asset classes:
Payment stablecoins. USDC, USDT, and bank-issued tokens. Reserve custody for stablecoin issuers is now a live business line for trust banks.
Bitcoin and ether. Mainline custody for institutional clients. Several national trust banks have launched dedicated custody products.
Tokenized securities and treasuries. The fastest-growing category, particularly tokenized money-market funds.
The accounting mechanics
Under SAB 121, the bank's balance sheet looked like this for every dollar of crypto custodied:
Asset: digital asset at fair value
Liability: safeguarding obligation at fair value
The numbers offset, but they hit risk-weighted assets and leverage ratios. Under SAB 122, the bank applies ASC 450 (US GAAP) or IAS 37 (IFRS):
Recognize a liability ONLY when a loss contingency is probable and estimable.
Disclose the nature of safeguarding obligations and any material concentrations qualitatively and, where appropriate, quantitatively.
Net effect: in routine custody, the customer's crypto stays off the bank's balance sheet, which is how custody of cash equivalents and securities has always worked.
Why this opened stablecoin custody specifically
Stablecoin issuers need two things from a bank partner: reserve custody (the dollars and Treasuries backing the token) and, increasingly, token custody for institutional holders. SAB 121 made the second leg uneconomic. With SAB 122 in force, the same trust bank that custodies the reserves can custody the token for a corporate treasury client.
For issuers building toward GENIUS Act compliance, this is structural. GENIUS requires monthly reserve attestation, segregated reserves, and qualified custodians. SAB 122 lets banks step into that role at scale.
What SAB 122 does NOT do
It does not authorize banks to take principal positions in crypto. SAB 122 governs accounting for custody, not for trading-book or banking-book exposure.
It does not preempt prudential regulators. The OCC, Fed, and FDIC still set the supervisory expectations. A bank still needs the right charter and the right interpretive coverage to custody a given asset.
It does not eliminate disclosure. Material safeguarding obligations still get disclosed in the notes to financial statements.
It does not contain an eligible-asset list. Any content that claims SAB 122 lists which assets banks can hold is wrong. Eligibility runs through banking-regulator interpretive letters.
Operator implications: stablecoin issuers
If you are a stablecoin issuer, SAB 122 changes your bank-partner conversations in three ways:
Reserve custody pricing falls. Banks no longer price in capital cost for safeguarding obligations. Custody fees for reserve assets have compressed since Q2 2025, with issuers reporting materially lower bank custody pricing on stablecoin reserves.
Token-level custody is now buy-side viable. Corporate treasuries that wanted bank custody of stablecoins (not just the underlying) now have it. This is a distribution channel that did not exist pre-SAB 122.
Audit cycles get shorter. Issuers undergoing monthly attestation under GENIUS find that custody-bank attestations now sit in familiar accounting frameworks. Auditors move faster.
Operator implications: banks
For banks, the post-SAB 122 build looks like this:
Apply existing GAAP loss-contingency framework. No special chart-of-accounts changes for typical custody.
Map each custodied asset against your prudential regulator's interpretive coverage. If no letter covers it, do not custody it without supervisory non-objection.
Build disclosure language in the 10-K notes that describes the nature and scale of safeguarding obligations.
Stress-test for the contingencies that DO trigger SAB 122 liability recognition: smart-contract failure of a stablecoin you custody, loss of private-key control, sanctions-driven asset freezes.
Comparison: SAB 121 vs SAB 122
Effective dates. SAB 121 in force March 2022 to January 23 2025. SAB 122 in force from January 23 2025.
Balance sheet treatment. SAB 121: gross-up. SAB 122: off balance sheet absent contingency.
Capital impact for banks. SAB 121: punitive. SAB 122: parity with traditional custody.
Disclosure. SAB 121: gross-up plus notes. SAB 122: notes only, with contingency language.
Practical effect on bank custody offerings. SAB 121: blocked. SAB 122: open.
The road from SAB 122 to the current bank-custody market
SAB 122 was the first move. The follow-on building blocks have been:
OCC interpretive letters clarifying which crypto activities national banks can conduct.
GENIUS Act passage (July 2025) creating a payment-stablecoin framework that depends on bank custody.
Federal Reserve and FDIC guidance updates removing pre-clearance burdens for state member and non-member banks.
Operators evaluating a bank custody partner today should ask for three things: the SAB 122 disclosure language, the prudential-regulator interpretive coverage by asset, and the contingency-recognition policy.
Bottom line
SAB 122 did not invent bank crypto custody. It removed the single largest accounting barrier to it. The eligible-asset list still flows through prudential regulators, but the path is open and the market has moved through it. For stablecoin operators, the post-SAB 122 era means real bank partners for real reserve and token custody, priced like custody of any other asset.
Sources
SEC Staff Accounting Bulletin No. 122, January 23 2025
SEC Staff Accounting Bulletin No. 121, March 31 2022 (rescinded)
ASC 450, IAS 37 (loss-contingency frameworks)
OCC interpretive letters on crypto custody (see the OCC's published interpretive letter index)