UK Stablecoin Regime 2026: FCA Rules, BoE £40bn Cap, 2027 Timeline

Picture the treasurer of a Manchester importer who settles a few million pounds a month with suppliers in Rotterdam and Shenzhen. Last November she read that the Bank of England wanted to cap every company's holding of a big sterling stablecoin at £10 million. By the end of June 2026 that cap was gone, replaced by a ceiling on the coin itself. That one switch tells you most of what you need to know about how Britain's stablecoin rulebook was built: cautious, argued over in public, and then softened at the last minute.

The UK now has a two-regulator system for stablecoins. The Financial Conduct Authority (FCA) writes the rules for anyone issuing a sterling-pegged coin from a UK establishment and for the firms that hold, trade and arrange crypto for customers. The Bank of England steps in only when HM Treasury decides that a coin, or the payment system around it, has become big enough to matter for financial stability. This piece walks through both layers, the numbers that changed in 2026, and the dates between now and the full start in October 2027.

Two regulators, split by function rather than label

The architecture comes from the Financial Services and Markets Act 2000, amended by the Cryptoassets Regulations that HM Treasury steered through Parliament, which create a new set of regulated activities. One of them is issuing a "qualifying stablecoin" in the UK. Another is safeguarding cryptoassets for clients. A third covers running a trading platform. All of them require FCA authorisation from 25 October 2027.

The Bank of England's role is narrower but sharper. Under the Banking Act 2009 it already supervises systemic payment systems, and Treasury can now recognise a stablecoin arrangement as systemic. Once that happens the Bank takes over prudential matters (backing assets, capital, failure planning, the issuance guardrail) while the FCA keeps conduct (Consumer Duty, disclosure, market abuse, financial crime, complaints). The two regulators set this out in a joint document published on 30 June 2026. Recognition does not hand a firm from one regulator to the other. It adds the Bank on top.

Our view: this is a sensible design on paper and an expensive one in practice. A systemic issuer will answer to two supervisors with slightly different rulebooks, and the first one to be recognised will be the test case for whether the coordination actually works.

The FCA layer: what PS26/10 requires of every issuer

On 30 June 2026 the FCA published its final crypto package, five policy statements numbered PS26/9 to PS26/13. The one that matters most for stablecoins is PS26/10 on stablecoin issuance, which finalises the proposals first floated in consultation paper CP25/14. The core obligations:

• Full backing from the moment of minting, including coins the issuer holds on its own balance sheet.
• Statutory trust. Backing assets sit in a trust for holders, so they are ring-fenced if the issuer fails. The terms of that trust will come in a separate consultation.
• A permitted asset list that was not widened. The FCA refused to allow multi-currency backing, and tokenised versions of permitted assets are acceptable.
• A 5% buffer of excess backing is allowed, and up to 20% of the pool may sit with an intragroup custodian.
• Redemption at par by the end of the next business day, with the clock starting only after know-your-customer checks are done.
• No interest or yield passed from backing assets to holders, either by the issuer or by a third party. Third parties can still offer rewards.

Law firm analysis from A&O Shearman notes the FCA dropped a requirement to forecast redemption levels, a small change that removes a lot of modelling work. The companion prudential statement, PS26/12, also halved the operational-risk K-factor for issuance from 2% to 1%, according to KPMG's summary. Both moves read as the FCA listening to the industry that the government says it wants to attract.

The no-yield rule is the one to watch. The FCA said plainly that further work on competition effects does not mean it is about to change its mind. That puts the UK in the same camp as the US and EU on issuer-paid interest, a theme we cover in our comparison of the GENIUS Act and MiCA.

The Bank of England layer: from holding caps to an issuance guardrail

The Bank's November 2025 consultation was the most conservative stablecoin proposal of any major central bank. It suggested limits of £20,000 per individual and £10 million per business for each systemic coin, and required at least 40% of backing to sit in unremunerated deposits at the Bank. Industry pushback was loud, and the House of Lords Financial Services Regulation Committee weighed in with a report on 3 June 2026.

The policy statement of 22 June 2026 changed three big things. Individual and business holding limits were dropped entirely. In their place sits a temporary maximum issuance of £40 billion per systemic stablecoin, which the Bank says it expects to loosen and eventually remove. And the deposit share of backing fell from 40% to 30%, with the other 70% allowed in short-term gilts of up to six months' residual maturity, which can earn a return.

Some details matter for anyone modelling an issuer. The 30% deposit requirement is on a best-endeavours basis, but the Bank wants to hear if deposits fall below 25% for more than five consecutive business days or below 20% at any point. Capital must be the higher of six months of operating costs or the cost of recovery and orderly wind-down, with an early warning if it drops below 110% of that minimum. A coin that is systemic from day one can start with up to 95% in short gilts and only 5% in Bank deposits, stepping towards the 30/70 split as it grows. The Bank will also offer a backstop facility that lends central bank money against gilts in exceptional stress, with details due in 2027.

Britain swapped a cap on users for a cap on issuers, and that is a better trade.

We think the switch was right. Per-person limits would have required issuers and wallets to track every holder across every platform, something nobody had worked out how to do on public blockchains with self-custodied wallets. A ceiling on total issuance is something a single firm can monitor and report daily.

A worked example: the economics of a £5bn systemic sterling coin

Take a hypothetical sterling coin with £5 billion in circulation that Treasury has recognised as systemic, and which has completed its transition to the steady-state split.

1. Backing composition. 30% of £5bn, or £1.5bn, must sit in unremunerated deposits at the Bank of England. The remaining £3.5bn can be in gilts with up to six months to maturity.
2. Income base. Only the £3.5bn earns anything. For every 1 percentage point of gilt yield, the issuer earns £35m a year before costs. Under the November proposal (60% gilts) the same coin would have earned £30m per point; under the systemic-at-launch allowance (95% gilts) it would earn £47.5m per point.
3. Guardrail headroom. The coin can grow eightfold before it hits the £40bn ceiling. At that size, £12bn would be parked at the Bank earning nothing.
4. Holder side. A business holding £25m of the coin for supplier settlements, illegal under the old £10m proposal, is now fine. It earns no interest from the issuer, but could receive payment-linked rewards such as cashback.

Compare that with how dollar issuers make money, where nearly all reserves can be in Treasury bills and repo. The UK's 30% dead-weight is the price of access to central bank money and a liquidity backstop, which is why the model reads more like a narrow bank than a fintech. Our explainer on how stablecoin issuers make money sets out the dollar side of that comparison.

What happens to USDT, USDC and other foreign coins

Dollar stablecoins dominate global supply. Total stablecoin supply is about $306 billion as of October 2026 according to DefiLlama, with USDT around $184 billion and USDC around $73 billion. Neither is a sterling coin, and neither is issued from the UK, so neither falls under the Bank's systemic regime today. They stay under the FCA's perimeter for UK firms that trade, hold or arrange them.

The Bank has said it may defer to a home regulator for non-sterling coins that become systemic in the UK, provided outcomes are similar and cooperation arrangements exist. That clause will matter if dollar coins start to be used widely for retail payments in Britain. It is also where the UK's approach differs most from the EU, which forces foreign coins to be issued by an authorised local entity before they can be offered to the public. For the EU detail see our guide to MiCA's EMT and ART categories.

Draft amendments published by HM Treasury on 21 April 2026 also tweak the edges. They would take UK qualifying stablecoins out of the dealing and arranging activities when used in payments, and pull most UKQS-only transactions out of the financial promotions regime, according to Regulation Tomorrow. The clear intent is to stop the crypto rulebook from accidentally blocking stablecoin payments before a separate payments reform arrives.

The road to October 2027

The calendar is already running. The FCA opened pre-application meetings in the spring and its authorisation gateway on 30 September 2026. Firms that apply by 28 February 2027 get a saving provision to keep operating while their application is assessed; firms that miss it face a hard stop on 25 October 2027 if they are not authorised. The FCA's statutory clock for deciding a complete application is up to six months, or twelve if it is incomplete, which explains the rush.

On the Bank side, the consultation on a draft Code of Practice for systemic issuers closed on 22 September 2026 and the joint BoE-FCA document consultation on 30 September. The Bank intends to finalise the Code by the end of 2026 and publish further consultations, including on special administration for failed issuers, through 2027. A newly recognised issuer faces a transition of up to 12 months for its settlement account and backing assets, plus up to 24 more months to meet capital and reserve requirements.

What this means for remittances and cross-border users

For individuals sending money from the UK, nothing changes yet. Corridors like London to Mumbai still run mainly on bank and card rails, as covered in our UK to India transfer guide. A regulated sterling stablecoin could in time give money transfer firms a 24/7 settlement asset with a legal right to redemption at par, which is a better foundation than today's offshore dollar coins. But the cost of the backing rules and the dual supervision mean the first sterling coins are more likely to come from banks and large payment firms than start-ups.

We would watch three things. First, whether any firm applies to issue a sterling coin through the gateway before the February deadline, which will signal whether the economics work. Second, whether Treasury recognises a coin as systemic before the 2027 start, which would trigger the first real test of joint supervision. Third, whether the £40bn guardrail is relaxed in the final Code. For the wider picture of how other G20 jurisdictions are approaching cross-border settlement, see our G20 cross-border payments explainer.

This article explains rules as published by UK authorities as of July 2026, with timeline updates. It is not legal advice. Firms considering an application should take advice from a qualified UK regulatory lawyer.

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