The Treasury Department has finally broken the regulatory silence surrounding the GENIUS Act. On September 30, 2026, the agency published an interim final rule (Federal Register 2026-19966), marking the first instance of binding, effective-upon-publication regulation under the statute. For months, the industry has been parsing a series of proposed rules — from the OCC, the Fed, and Treasury’s own Section 3 efforts — that functioned as little more than signals of intent. This rule, however, is operational.
The regulation establishes the procedural machinery for the Stablecoin Certification Review Committee (SCRC), a body chaired by the Treasury Secretary and including the heads of the Federal Reserve and the FDIC. Its mandate is to evaluate whether state-level regulatory regimes are “substantially similar” to federal standards. While the rule is procedural rather than substantive, it is the gatekeeper for the entire state-level pathway. There is, however, a significant operational caveat: the SCRC will not actually accept certifications until the Office of Management and Budget grants Paperwork Reduction Act (PRA) approval for the required information collection. Until that administrative box is checked, the committee’s doors remain effectively locked.
The core of the rule is the $10 billion threshold, a hard line that enforces a structural bifurcation in the stablecoin market. Issuers with consolidated total outstanding issuance of $10 billion or less may opt for state regulation, provided their home state’s regime passes the SCRC’s “substantially similar” test. Issuers exceeding that $10 billion cap are categorically excluded from this state pathway and must transition to the federal framework within 360 days, unless they secure a specific waiver under Section 4(d)(3). This creates a two-tier system where the regulatory burden scales not just with complexity, but with the sheer volume of circulating supply.
The market implications of this threshold are immediate and exclusionary. Tether and Circle, the two largest players in the space, are well above the $10 billion mark and are effectively barred from the state-level route. Circle, having already secured an OCC charter in December 2025, is already navigating the federal track. Tether’s status as a non-U.S. entity renders the state pathway moot, as the GENIUS Act Section 4(c) state pathway applies only to issuers organized under U.S. or state law. The state-level option is designed for smaller U.S. trust-charter or SPDI-issued stablecoins — a sandbox for sub-$10 billion issuers while systemic players are funneled into the federal fold.
This bifurcation has already drawn scrutiny from the American Bankers Association (ABA). The ABA has raised concerns that state-certified frameworks could inadvertently permit stablecoin issuers to engage in activities beyond the narrow scope defined by the GENIUS Act. If a state regime is deemed “substantially similar” but allows for broader operational latitude, it could create a regulatory arbitrage opportunity that the SCRC will have to police during its annual recertification process. The committee’s power to deny recertification based on material changes or significant shifts in circumstances provides a mechanism for course correction, but it also introduces a layer of perpetual uncertainty for state-regulated issuers.
The timing of this rule is particularly pointed. Seven federal agencies famously missed the July 18, 2026 statutory rulemaking deadline, leaving the industry to speculate on the pace of implementation in our previous coverage of the deadline miss. While the OCC has committed to a final implementing rule by November 2026, the Treasury’s move suggests a desire to regain control of the narrative. This rule follows a long period of regulatory deadlines that felt more like suggestions than mandates, and it arrives as the industry continues to monitor capital flows in anticipation of the January 18, 2027, effective date for the GENIUS Act.
Looking ahead, the January 18, 2028 deadline for initial state certification looms large. States that had prudential regimes in place before January 14, 2026, will benefit from an expedited timeline, but the broader challenge remains the “substantial similarity” standard. With the comment period open until November 30, 2026, and the Treasury still working through Docket TREAS-DO-2026-0232 regarding the principles of that similarity, the industry is currently in a holding pattern. The rule is live, but the real test of the GENIUS Act’s bifurcated architecture will only begin once the PRA approval is secured and the first state applications hit the SCRC’s desk.