SEC finalizes payment stablecoin custody rules

After eight months of comment-and-revision, the SEC finalized the custody-and-segregation rules implementing GENIUS Section 4. The rules take effect 180 days after publication in the Federal Register.

What it says

Permitted payment stablecoin issuers must:

• Hold reserves with a qualified custodian as defined by the Investment Advisers Act, plus a narrow list of federally chartered banks. State trust companies make the list only if their state regime is on the SEC's pre-approved list (currently NY, NJ, WY).
• Segregate reserves operationally from issuer corporate assets. Commingling — even temporarily — is grounds for charter suspension.
• Provide monthly third-party attestation of reserve composition by a PCAOB-registered firm. Attestations must be publicly published within 15 days of the reporting period.
• Maintain a 12-month rolling liquidity stress test with results filed quarterly with the OCC.

Why it matters

The custody rules close the operational ambiguity that has been the only legitimate concern about GENIUS implementation. Compliant issuers (USDC, the major bank-issued stablecoins) were already operating substantially within these parameters. Less-compliant historical practice now has a clear remediation path.

Net: payment stablecoins are now regulated as functionally cash-equivalent on the operational side. Institutional treasury operations can hold USDC under the same custody framework they apply to bank deposits.

What's still pending

• State trust company approvals. Several large state regimes (TX, FL, CA) are not yet on the SEC's pre-approved list. This affects regional issuers seeking state pathways.
• Cross-border reserve treatment. US-issuer reserves held offshore (e.g., at international branches) still operate under separate guidance pending final rule-making.
• Tokenized bank deposit treatment. Bank-issued tokens that behave like stablecoins but are legally deposits remain in a distinct regulatory category.

For institutional allocators

If you hold USDC or comparable compliant stablecoins, no operational change is required. Your custodian is almost certainly already aligned with the final rules.

If you hold non-compliant issuance (older offshore products, smaller emerging issuers), evaluate whether continued exposure is consistent with your compliance posture as the 180-day implementation window closes.

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Briefing · IMPCT Institute · Regulatory