The Office of the Comptroller of the Currency has issued a proposed rule outlining the principles for determining whether a state's stablecoin regime is substantially similar to the federal framework established under the GENIUS Act. The comment period for the proposal closed in early June 2026, marking a step toward operationalizing the landmark U.S. stablecoin law.
The GENIUS Act Framework
The GENIUS Act set a federal structure for payment stablecoin issuance in the United States, establishing requirements around reserve backing, redemption rights and issuer supervision. A central feature of the law is a dual pathway: issuers can operate under federal oversight or, in certain cases, under a state regime deemed substantially similar to the federal standard. The proposed rule addresses how that similarity determination is made.
What the Proposal Covers
- Principles for assessing whether a state regime matches the federal standard
- Part of implementing the GENIUS Act's dual federal-state pathway
- Comment period closed in early June 2026
- Complements separate rulemakings on reserves and issuer standards
Why Substantial Similarity Matters
The substantial-similarity test is pivotal because it determines whether state-chartered issuers can operate under their home-state rules or must meet federal requirements directly. A clear, consistent standard gives states a benchmark to measure their frameworks against and gives issuers predictability about which regime governs them. Too lenient a test could invite regulatory arbitrage, while an overly strict one could hollow out the state pathway the law intended to preserve.
Parallel Rulemaking
The OCC's proposal is one of several rulemakings advancing the GENIUS Act. Federal regulators have faced deadlines to finalize technical standards covering reserve audits and cybersecurity, and separate proposals have addressed prudential standards for certain payment stablecoin issuers. Together these efforts translate the statute's broad mandates into the detailed rules issuers must follow.
- The test shapes whether issuers follow state or federal rules
- Balance is needed to avoid both arbitrage and a hollow state path
- Multiple parallel rulemakings are building out the framework
Implications for Issuers
For stablecoin issuers, the emerging rules clarify the compliance landscape they have awaited since the law's passage. Firms weighing whether to pursue federal or state authorization will look closely at how the substantial-similarity principles are finalized, since that determination affects licensing, supervision and operating requirements. The outcome will influence where issuers choose to base their operations within the United States.
The Regulatory Trajectory
The proposal reflects a broader shift in which stablecoins have moved into the regulatory mainstream across several major economies. As U.S. agencies finalize technical standards, the market gains the clarity that many issuers and institutional participants have said they need to engage more fully. Market observers will watch how the OCC incorporates public comments as it moves toward a final rule.
For now, the proposal signals that the machinery of stablecoin regulation is moving from statute to enforceable detail, a process with significant consequences for how the U.S. market develops.