What Do Treasury's GENIUS Act Rules Mean for Issuers?

In brief: The US Treasury has moved past the GENIUS Act's early July milestone and into active rulemaking, issuing an Advance Notice of Proposed Rulemaking on September 19, 2025 that asks the market how to implement the first federal framework for dollar-payment stablecoins. The law, signed July 18, 2025, requires one-to-one backing in cash and short-dated Treasuries, monthly reserve disclosure, and either federal or substantially similar state supervision. For institutions weighing issuance or reserve mandates, the open questions now sit in the detail rather than the statute.

The Guiding and Establishing National Innovation for U.S. Stablecoins Act, known as the GENIUS Act, is the first United States federal law to set a comprehensive framework for dollar-payment stablecoins, and it was signed into law on July 18, 2025 after passing the Senate 68 to 30 and the House 308 to 122. A payment stablecoin under the Act is a digital instrument redeemable at a fixed monetary value and backed by identifiable reserve assets, issued only by a permitted issuer. That definition matters because the statute deliberately places these instruments outside securities and commodities law and largely inside a banking-style supervisory framework, a point the White House underscored when it described the result as the first federal regulatory system for stablecoins built on strong reserve requirements.

What did Treasury actually do after the July deadline?

Treasury opened the implementation phase. On September 19, 2025, the department published an Advance Notice of Proposed Rulemaking in the Federal Register, inviting public comment on how the GENIUS Act should be carried into practice. An advance notice is a scoping step: rather than proposing binding text, Treasury set out the questions it needs answered before it drafts rules, covering reserve composition, custody, anti-money-laundering obligations, and the treatment of issuers that operate across state lines.

The comment window drew immediate pressure from the industry. The American Bankers Association asked Treasury to extend the deadline, arguing the questions were too consequential to answer on the original schedule, and Treasury granted a brief extension before the period closed. That sequence tells institutions something useful: the framework is set in law, but the operating detail is still being negotiated in the open, and the firms that engage early are shaping the rules they will later be measured against.

What does the GENIUS Act require of a stablecoin issuer?

The core obligation is full backing. Under Section 4, every permitted payment stablecoin issuer must hold identifiable reserves on at least a one-to-one basis, with the fair value of reserves equal to or greater than the par value of coins in circulation at all times. The Congressional Research Service summarizes the permitted reserve set narrowly: coins and currency, deposits at insured banks and credit unions, short-dated Treasury bills, repurchase and reverse repurchase agreements backed by Treasuries, government money market funds, and central bank reserves. Skadden notes that eligible Treasury instruments are capped at a remaining maturity of 93 days or less, a deliberate constraint that keeps reserves short, liquid, and easy to value.

Beyond backing, the Act layers on transparency and supervision. Issuers must publish the composition of their reserves every month and support redemption at par. The Richmond Fed describes the resulting structure as a dual federal-state regime, and the supervisory path depends on scale. Issuers above $10 billion in outstanding stablecoins fall under a federal regulator such as the Office of the Comptroller of the Currency, while smaller issuers may remain under a state framework, provided that framework is certified as substantially similar to the federal standard.

The practical reading for a treasurer or an asset manager is that a compliant payment stablecoin behaves less like a speculative instrument and more like a narrowly regulated cash equivalent: par-redeemable, short-reserved, disclosed monthly, and auditable. That is the profile institutions can actually underwrite against.

How does the US framework compare with the EU and Hong Kong?

The GENIUS Act arrives into a field where other major jurisdictions moved first, and the comparison is instructive for any institution operating across borders.

The World Economic Forum has framed the US and EU regimes as converging in substance even as they differ in mechanism, both demanding full reserves and redemption rights while diverging on how much sits in bank deposits versus government securities. Hong Kong's Stablecoins Ordinance, which took effect on August 1, 2025, similarly requires full backing in high-quality liquid assets under Monetary Authority licensing. For an issuer contemplating multiple markets, the headline is convergence on principle and divergence on plumbing, which means reserve construction and disclosure will need to be jurisdiction-aware rather than one-size-fits-all.

Why does the rulemaking detail matter more than the statute now?

Because the statute settled the direction and the rules will set the cost of compliance. The GENIUS Act tells an issuer it must hold Treasuries and disclose monthly; the rulemaking will decide what a disclosure must contain, how custody is verified, which state regimes qualify as substantially similar, and how anti-money-laundering duties attach to a permitted issuer. Those answers determine whether issuance is operationally feasible for a mid-sized institution or effectively reserved for the largest balance sheets.

The fact that the comment period drew extension requests from the banking sector is a signal in itself. It shows that the regulated community sees real stakes in the granular questions, not just the headline framework, and that the window to influence the operating standard is genuinely open rather than ceremonial. Institutions that treat this phase as a formality will inherit rules written by those who did not.

For firms building toward programmable, composable, and auditable dollar instruments, the direction of travel is now clear enough to plan against: full reserves, short maturities, monthly transparency, and a supervisory home determined by scale. The task is to design issuance and reserve mandates that satisfy the letter of the GENIUS Act while staying legible across MiCA and other regimes, and to do it before the proposed rules harden the detail into a binding standard.