Treasury proposes stablecoin definitions in first GENIUS Act rulemaking

The Treasury Department has proposed the first federal definitions of what counts as a U.S. stablecoin and which issuers must follow the GENIUS Act, drawing the initial boundaries of the regulated market. CoinDesk reported the proposal Monday.

The Guiding and Establishing National Innovation for U.S. Stablecoins Act — GENIUS, for short — was finished by Congress last year. It splits rulemaking among Treasury, banking regulators, and market regulators, each with its own piece. Monday's proposal follows the advance notice Treasury issued in September. It opens a 60-day comment period running to mid-October.

Treasury is treating stablecoins as a new arena. It studied the longstanding legal regimes that govern securities offerings, including their treatment of offshore activity, and concluded that grafting investment rules onto payment stablecoins would frustrate the statutory purpose: efficient payment and settlement across borders. The proposed definitions lean on the statute's own language, not on precedent, a sign the department wants a bespoke regime.

The line between a security and a payment instrument carries real consequences. It sets compliance duties such as registration, disclosure, and custody, and it shapes whether funds, endowments, and corporate treasuries can hold a stablecoin under their own rules. Treasury's inclinations are clear; the comment period will test how far it goes.

Treasury Secretary Scott Bessent said in a statement that the administration is working to give businesses the regulatory certainty they need to innovate and grow, cement the dollar's role as the world's reserve currency, and keep America the crypto capital of the world.

The proposal raises a long list of interpretive questions, but the industry's focus is on foreign issuers, above all Tether, the sector's leader. Whether offshore companies that serve U.S. customers must register and report is the most commercially consequential issue in the rulebook. The answer will shape the global structure: issuers could set up in the United States, move farther offshore, or serve only non-U.S. clients. A strict extraterritorial reading would put Tether and other major issuers under U.S. oversight; a narrow one would leave offshore issuers beyond the reach of U.S. law.

The timeline adds pressure. The statute gave regulators one year to implement its rules, and that deadline passed last month without being met. The law's effective date is meant to arrive by January 18, and all rules are unlikely to be finalized by then. New rules usually arrive with phase-in periods that give issuers and the banks holding their reserves time to conform. The gap between the statutory schedule and regulatory reality is itself a cost. If the final rules come late with a compliance period, the statutory date becomes a marker rather than a binding deadline. That offers some relief, but it also stretches the period in which issuers must guess what the rules will require.

Then there is Congress. The Digital Asset Market Clarity Act, under consideration on the Hill, would rewrite parts of GENIUS, especially its treatment of rewards programs. Treasury is writing a rulebook for a statute that may change before the rulebook is finished.

For asset managers, funds, and treasury desks, these definitions are the basis of the onchain cash stack. On the same day the SEC staff cleared Franklin Templeton to run cash through a tokenized money fund under Rule 17f-2, Treasury is defining the stablecoin side of that stack. The pieces fit together: the tokenized money fund gives institutions a securities-law-compliant way to hold cash onchain, while a clear stablecoin regime would give them a payment network alternative with its own custody and reporting rules. The final rule's treatment of securities versus payment instruments, and of offshore issuers, will determine which stablecoins institutions can legally hold across custody and settlement rails.

The comment docket is the industry's opening to shape those answers. The questions are broad, the timeline is short, and the law could shift mid-rulemaking. For issuers and the institutions that use their tokens, the next few months decide what compliance means in practice.