The UK is the only major economy putting a hard ceiling on how many sterling stablecoins can exist — a £40 billion issuance cap per systemic token. Here's why the Bank of England wants it, and what it means for anyone holding GBP stablecoins.
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The UK has done something no other big economy has tried: it wants to put a hard number on how many sterling stablecoins are allowed to exist. The Bank of England's plan caps issuance of any single systemic sterling stablecoin at around £40 billion. Cross that line and the issuer can't simply print more. It's a deliberate brake — and it's made Britain the odd one out.
Compare the neighbours. Europe's MiCA rules set no overall ceiling on euro tokens. America's GENIUS Act demands full reserve backing but doesn't limit total supply. Only the UK has reached for a cap on the headline number itself.
The short version: the Bank of England is worried about what happens to ordinary bank deposits if too much money leaves them. A systemic sterling stablecoin is one that gets so widely used for payments that its failure could shake the financial system. The cap is meant to keep that genie in a bottle while everyone learns how these things behave at scale.
Here's the mechanism the Bank frets about. If millions of people move savings out of high-street bank accounts and into stablecoins, banks have less deposit funding to lend against. Lending gets tighter, mortgages and business loans included. The Bank has been blunt that it doesn't want a sudden, disorderly drain. A ceiling slows the migration to a walk rather than a sprint.
There's also the boring-but-vital matter of redemption. If a £40 billion token had to be cashed out in a panic, the reserves backing it would need selling fast, and fire sales of even safe assets move markets. Keeping the cap modest keeps the cleanup manageable if something breaks.
The design shifted this year, and it matters. Earlier proposals floated per-user holding limits — something like £10,000 to £20,000 of stablecoins per person. Those drew heavy criticism for being unworkable and faintly absurd: how do you police one person's holdings across self-custody wallets? In 2026 the approach moved toward an issuance cap on the systemic token itself, reportedly in the region of £40 billion, rather than policing individuals.
That's a real improvement. Telling a business it can't hold more than £20,000 of a payment instrument would have killed the use case for anyone moving real money. Capping total issuance is clumsy too, but at least it doesn't turn every treasurer into a rule-breaker for holding a working balance.
The catch is what happens when a popular token bumps the ceiling. Demand for the eleventh billion of a token that's already at £40 billion doesn't vanish — it either spills into a second issuer, leaks into dollar stablecoins instead, or sits unmet. None of those is obviously the outcome the Bank wants.
The cap sits inside a much bigger build-out. The UK passed the Financial Services and Markets Act 2000 (Cryptoassets) Regulations 2026 in February, and the full regime is expected to switch on around 25 October 2027. Stablecoins are split across two regulators: the FCA authorises issuers of UK qualifying stablecoins, and the Bank of England takes over supervision once a token becomes systemic.
To issue a UK qualifying stablecoin legally, the issuer has to be established in the UK and run the whole lifecycle here — offering, redemption, reserve management, the lot. That's a stricter "home base" rule than the US or EU impose, and combined with the issuance cap, it tells you the UK's instinct is caution first, scale later.
For context on how the digital pound and private stablecoins are meant to coexist, the Bank still frames central bank money, tokenised deposits and regulated stablecoins as three rails living side by side rather than one winner.
For now, very little changes day to day. Today's biggest stablecoins are dollar-denominated — Tether and Circle's USDC dominate, and neither is sterling. A £40 billion sterling cap only bites once a genuinely large GBP token exists, which it mostly doesn't yet. The rule is pre-emptive, drawn up before the thing it governs is even built.
The longer-term effect is subtler. A cap signals that the UK doesn't want sterling stablecoins to get too big, and that signal shapes where issuers choose to launch. If building a sterling token means a ceiling on your own success, some issuers will simply prioritise dollar tokens — which is how you end up with a digital economy that quietly runs on someone else's currency. That's the irony critics keep pointing at: a rule meant to protect sterling could end up sidelining it.
Sensible instinct, awkward instrument. The Bank is right to be wary — letting an untested payment token swell to hundreds of billions before anyone understands the run dynamics would be reckless. But a fixed pound figure is a blunt tool for a fast-moving market, and £40 billion that looks generous in 2026 could look quaint by 2030. The smart version of this policy is one that ratchets the cap up as confidence and reserve quality improve. Whether the regime is nimble enough to do that, we'll find out.
What is the UK's £40 billion stablecoin cap? It's a proposed ceiling from the Bank of England on how much of a single systemic sterling stablecoin can be issued — roughly £40 billion. Beyond that limit, the issuer can't expand supply. It applies to large, payment-critical sterling tokens, not to dollar stablecoins.
Does the cap limit how much crypto I can personally hold? No. Earlier plans floated per-person holding limits, but the 2026 approach targets total issuance of the token rather than individual wallets. There's no rule capping how much of a stablecoin you can personally own.
Why doesn't the EU or US have a stablecoin cap? The EU's MiCA framework and the US GENIUS Act both regulate reserves and issuer conduct but place no ceiling on total token supply. The UK is currently the only major economy proposing an outright issuance cap on its native-currency stablecoin.
When do these rules take effect? The UK's broader cryptoasset regime is expected to come into force around 25 October 2027. Firms can begin applying for FCA authorisation from 30 September 2026, with the application window running to 28 February 2027.
Will the cap hurt sterling stablecoins? Possibly. Critics argue a ceiling discourages issuers from building sterling tokens, nudging them toward uncapped dollar stablecoins instead. Supporters say the cap is a temporary safety measure that can be lifted as the market matures.
This article is general information about UK crypto regulation and is not financial or investment advice. Cryptoasset values can fall as well as rise, and most cryptoassets are not protected by the Financial Services Compensation Scheme. Always do your own research.
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