Treasury drafts the stablecoin perimeter

The Guiding and Establishing National Innovation for U.S. Stablecoins Act settled the principle that payment stablecoins are a regulated payment instrument rather than an open question. It left the perimeter to be drawn later. On August 18 the Department of the Treasury proposed drawing it, publishing GENIUS Act Regulations on Payment Stablecoin Issuance, Offer, and Sale at document 2026-16796.

The proposal implements section 3 of the Act: the statutory prohibitions and limitations on payment stablecoin issuance, offer and sale in the United States. Section 3 is the part of the statute that operates by exclusion. It does not describe how a compliant issuer should behave so much as establish who is not permitted to be one.

That distinction matters more than it sounds. A reserve or disclosure requirement is a condition of operating, and a firm that fails it has a remediation problem. A prohibition on issuance is a question of standing, and a firm on the wrong side of it does not have a compliance programme to fix. It has a business that cannot be conducted.

The commercial consequence falls on distribution rather than issuance. Most institutions that touch a stablecoin do not mint it; they offer it, sell it, or hold it for a customer. Section 3 reaches offer and sale as well as issuance, which is why the rulemaking is being read closely by firms that never intended to run a reserve.

The comment period closes on October 19, 2026, a day before the SEC's separate crypto asset proposal. The two are not the same exercise. Treasury is implementing a statute that already passed. The Commission is proposing a regime under existing securities law. A payment stablecoin that satisfies the GENIUS Act framework sits outside the securities question by design; assets that do not are where the two proceedings begin to interact.

For issuers already operating, the practical work is establishing which of the statutory prohibitions apply to their structure, and whether the answer is different for the issuing entity than for the affiliates that distribute. Group structures assembled before the Act were not built with section 3 in mind.

The proposal is one part of a longer implementation. Section 3 governs who may participate; the provisions on reserves, redemption and supervision are separate exercises with their own timelines. Firms treating this rulemaking as the whole of GENIUS Act compliance will find they have answered only the first question.