Bank of England drafts systemic GBP stablecoin rules with £40B issuance cap
The draft lifts the share of reserves allowed in interest-bearing government debt to 70% and targets final rules by end-2026.
The Bank of England published a policy statement and draft rules for “systemic stablecoins” on June 22, replacing proposed per-user holding limits with a temporary £40 billion ($52.8 billion) issuance cap. The draft also loosens reserve constraints for regulated pound-backed stablecoins as the UK targets a 2027 payments-stablecoin regime.
Key Takeaways
- Draft rules for “systemic stablecoins” were published on 2026-06-22, with HM Treasury set to decide which stablecoins fall into the systemic regime.
- Systemic issuers would be permitted to hold up to 70% of reserves in interest-bearing government debt, up from a prior 60% proposal.
- The Bank of England replaced proposed per-user holding limits with a temporary £40 billion ($52.8 billion) issuance cap described as a regularly reviewed “guardrail.”
- The rulebook is targeted for end-2026 finalization ahead of a planned 2027 rollout, while non-systemic trading-focused stablecoins remain under FCA supervision.
BoE Drafts the UK’s Systemic Stablecoin Rulebook for Payments
The Bank of England (BoE) published a policy statement and draft rules on June 22 covering “systemic stablecoins,” a category defined as stablecoins widely used in payments that could pose risks to UK financial stability.
The designation call sits with HM Treasury, not the BoE. That matters for market structure because the same GBP stablecoin could face very different constraints depending on whether it is deemed systemic, even before any issuer-level supervision is discussed.
The BoE’s framing is explicitly payments-led. This is not a blanket rewrite of stablecoin oversight across the UK. The draft is aimed at pound-backed stablecoins that could scale into retail and merchant flows, where failure modes look more like payments infrastructure risk than exchange collateral risk.
Reserve Rules Loosen: Up to 70% in Interest-Bearing Government Debt
The draft would allow systemic stablecoin issuers to hold up to 70% of reserves in interest-bearing government debt, up from 60% under the previous proposal.
For issuers, that 10-point shift is not cosmetic. A higher allowance for interest-bearing government debt improves the economics of running a regulated GBP stablecoin at scale, especially relative to a tighter reserve mix that would have forced more non-yielding cash-like backing. In practice, better reserve carry can subsidize distribution, compliance, and redemption plumbing, which is where many payment-stablecoin models stall.
The BoE is still signaling a conservative reserve posture, but the direction is clear. The draft is trying to make the regulated model workable without conceding the stability mandate.
From Holding Limits to a £40B Issuance Cap: The New Guardrail
The BoE replaced proposed holding limits with a temporary £40 billion ($52.8 billion) issuance cap. The earlier November 2025 consultation had proposed caps of £20,000 per individual per stablecoin and £10 million per business per stablecoin.
The stated policy objective behind the original holding limits was to prevent large-scale deposit shifts out of banks that could reduce credit availability. The BoE now says respondents warned those limits could reduce stablecoin usability and create operational challenges for issuers.
The new mechanism is a cleaner market constraint. Instead of policing every user and business account, the BoE is putting a single ceiling on total issuance, which is easier to monitor and less likely to create friction in day-to-day payments. The central bank described the cap as temporary, writing: “This guardrail will be reviewed regularly and removed once risks to credit provision have been addressed,” leaving the duration and review criteria as open variables.
Deadlines, Designation Risk, and the Cap Review Path Into 2027
The BoE is targeting end-2026 to finalize the systemic stablecoin rulebook ahead of a planned 2027 rollout. Until that finalization, the market is trading a draft, not a settled regime.
The biggest near-term uncertainty is the implementation path. HM Treasury’s approach to systemic designation will determine who is pulled into the BoE’s perimeter and when. Separately, the £40 billion cap is explicitly subject to regular review, but the draft does not specify timing, triggers, or the process for raising or removing the guardrail once credit-provision risks are addressed.
One more perimeter line matters for traders: the BoE’s systemic regime applies only to stablecoins deemed systemic. Non-systemic stablecoins mainly used for crypto trading remain under Financial Conduct Authority supervision, implying different rulebooks depending on use case and scale.
Why This Draft Matters for GBP Stablecoin Scale and UK Crypto Rails
I see the shift from per-user holding limits to an issuance cap as the most market-relevant change. It reduces friction for real payments usage while keeping a single, monitorable ceiling that regulators can defend as a systemic-risk control. That is a more scalable design than trying to enforce wallet-level limits across households and businesses.
The threshold that matters is whether the cap becomes a short-lived transition tool or a persistent constraint that anchors GBP stablecoin growth below payment-network scale. If the designation process and cap review path stay vague into end-2026, this looks more like a sentiment catalyst than a fundamental shift. If those pieces firm up and the guardrail is credibly removable, the setup starts to look structural rather than narrative-driven, because it would define how quickly GBP stablecoins can become real UK payment rails.
