Britain’s Financial Conduct Authority has told crypto firms how its incoming rulebook applies to them, publishing perimeter guidance on Wednesday, two weeks before applications for authorization open.

The guidance covers issuing qualifying stablecoins, running trading platforms, dealing and arranging deals, safeguarding cryptoassets and arranging staking, and sets out which activities need FCA approval. The application window runs from September 30 to February 28, 2027, and the regime itself takes effect on October 25, 2027.

“This guidance gives firms the clarity they’ve asked for so they can prepare with confidence,” said David Geale, the FCA’s executive director of consumers, payments and competition.

A wide catchment area

The rules reach well beyond British-based companies. Parliament extended its territorial scope so that overseas firms dealing with, arranging for or safeguarding cryptoassets for UK retail consumers count as carrying on business in the UK, said Michelle Kirschner, a partner at Gibson Dunn, and the overseas persons exclusion that firms normally rely on “is simply not available for these activities.”

Two limits apply, with purely institutional business from overseas largely untouched, as well as firms reaching UK consumers only through a UK-authorized dealer or trading platform. “The policy intent is clear,” Kirschner said. “If a firm wants direct access to UK retail customers, it must come onshore and get authorised.”

The February deadline matters more than it looks. Applying inside the window triggers statutory saving provisions that let a firm keep operating while the FCA assesses it, said Thomas Brown, a partner at Shoosmiths. Miss it and the application is still accepted, but without that cover a firm not yet authorized by October 2027 is “likely to be restricted to servicing existing contractual arrangements and may be unable to onboard new customers or enter into new business.”

Until permissions are granted to commence on October 25, 2027, existing money laundering registrations and the financial promotions regime continue to govern. “It will not be the case that anyone will be authorised early,” Kirschner said, though early application does afford additional preparation time. Brown cautioned that firms should avoid treating February 2027 as a “target date rather than a deadline.”

What remains open

The government has amended the underlying legislation to add targeted exclusions and clarifications, and the FCA will consult in October on how the guidance should change. That consultation covers UK qualifying stablecoins, proprietary trading and market making, certain technology providers, decentralized protocols, safeguarding arrangements involving central securities depositaries, and financial promotions.

When the FCA finalized its rulebook in June, it said the regime would reach DeFi where there is an “identifiable controlling entity,” a term neither the legislation nor the regulator has defined. Brown listed what is likely to count, including a foundation or company controlling development, a team with authority to ship upgrades, anyone able to change core parameters, DAO participants with concentrated governance power, entities holding treasury assets, operators of user-facing interfaces, and anyone deriving commercial benefit from the protocol.

But the FCA has declined to publish worked examples, insisting on case-by-case assessment. The hardest questions, including what happens when several parties could each qualify, “have been deferred by the FCA rather than resolved,” Kirschner said, though she noted it “reflects a genuinely difficult perimeter problem that no major jurisdiction has yet cracked.”

Legislation was set out in February, the FCA consulted in April, rules were finalized in June, perimeter guidance arrived this week, the gateway opens this month, and the regime commences in just over a year. The Bank of England, which will supervise systemic stablecoins, replaced individual holding caps with a £40 billion issuance limit in June.

The FCA’s announcement dropped a day after the U.S. Senate declined to advance the Clarity Act, leaving oversight in America to what Kirschner called “an agency-by-agency patchwork that a future administration can rewrite.” Britain has a statute, a rulebook, guidance and a fixed commencement date, she noted, meaning that “for boards making multi-year decisions about where to build, that certainty is worth a great deal.”

Brown expects the result to be “a market divide,” with firms chasing institutional credibility and banking relationships drawn to Britain, while “smaller firms and highly experimental DeFi projects may continue to favour jurisdictions with lighter regulatory burdens.” The UK’s advantage, he said, “is unlikely to be minimal regulation.”