UK Stablecoin Regulation: A Principles-Based Approach to Payment Assets

The UK’s stablecoin regulatory journey began in January 2021, when HM Treasury published a consultation paper on the regulatory approach to cryptoassets and stablecoins — one of the earliest major government consultations on stablecoin regulation globally. The timing was not accidental: the prospect of Facebook’s Libra (later Diem) had concentrated regulatory minds across the G7, and the possibility of a privately issued global stablecoin achieving significant monetary scale prompted governments to consider their regulatory responses before the fact rather than after.

What emerged from three years of consultation was a framework that diverges in meaningful ways from both the EU’s prescriptive MiCA approach and the US GENIUS Act’s congressional model — reflecting the UK’s post-Brexit opportunity and apparent intention to design financial regulation on its own terms.

The Consultation Process: 2021 to 2023

HM Treasury’s January 2021 consultation set out a broad question: how should the UK regulate cryptoassets, stablecoins, and the potential issuance of a central bank digital currency? Responses from industry, consumer groups, academics, and financial institutions provided the evidence base for subsequent policy development. The consultation distinguished between different types of stablecoin — fiat-backed, commodity-backed, algorithmic, and crypto-collateralised — and proposed focusing regulatory attention first on fiat-backed stablecoins used as a means of payment.

This sequencing decision — payment stablecoins first — proved durable. The post-2022 collapse of the TerraUSD algorithmic stablecoin and the broader crypto market downturn reinforced the policy rationale for treating fiat-backed payment stablecoins as the priority regulatory case, given their potential for significant adoption and their closest equivalence to regulated electronic money. Algorithmic stablecoins and crypto-collateralised models were placed outside the initial regulatory perimeter.

In February 2023, HM Treasury published a more detailed consultation on the future financial services regulatory regime for cryptoassets, which included proposals for a comprehensive UK crypto regulatory framework under FSMA 2000 powers — the framework ultimately enacted through FSMA 2023 and the December 2025 statutory instruments. The 2023 paper confirmed the priority treatment of fiat-backed stablecoins and set out the proposed regulatory architecture for stablecoin issuers, custodians, and service providers.

The Three-Stage Regulatory Approach

The UK framework distinguishes between three categories of regulated entity in the stablecoin ecosystem. First, stablecoin issuers — entities that create and issue fiat-backed stablecoins — face the most demanding regulatory obligations, including requirements to maintain adequate backing assets, demonstrate redemption capability, and satisfy FCA authorisation standards. The framework requires that sterling-backed stablecoins intended for payment use must be backed by pound sterling assets held in trust.

Second, custodians of stablecoins — firms that hold stablecoins on behalf of users — face custody obligations analogous to those for other financial assets, including segregation requirements, operational resilience standards, and consumer protection duties. Third, service providers facilitating stablecoin transactions — exchanges, payment processors, and wallet providers — face requirements calibrated to the services they provide.

The Bank of England’s role is reserved for systemic stablecoins — those reaching a scale at which their failure or operational disruption could pose risks to UK financial stability. The Bank of England (Financial Market Infrastructure) Act 2022 gave the Bank powers to oversee systemic payment system operators, and systemic stablecoins would fall within this designation. This creates a tiered oversight structure: the FCA for the majority of stablecoin businesses; the Bank of England for those reaching systemic scale — with HM Treasury determining the designation thresholds.

Principles-Based Design

The defining characteristic of the UK framework is its principles-based approach. Rather than prescribing specific reserve asset compositions, minimum capital ratios, or maximum token quantities as MiCA does for e-money tokens, the UK framework establishes outcomes that authorised stablecoin issuers must achieve — maintaining redemption capability at par, protecting backing assets, managing operational risks — and leaves issuers to demonstrate how they achieve those outcomes.

This approach is philosophically consistent with the FCA’s general regulatory philosophy and with the UK’s ambition to create a post-Brexit regulatory environment that is responsive to innovation rather than locked into prescriptive rule structures. It gives issuers flexibility in how they structure their reserve arrangements, capital buffers, and operational infrastructure, provided they can demonstrate satisfactory outcomes in FCA authorisation and ongoing supervision.

The trade-off is comparability and market confidence. MiCA’s prescriptive requirements for e-money token issuers — 30% of reserve in bank deposits, daily reconciliation, prohibition on interest payments — are demanding, but they create a standardised baseline that investors and users can assess across different issuers. The UK’s principles-based approach may produce better-designed individual regimes for sophisticated issuers but makes it harder for retail users to compare regulatory protections across different stablecoins.

Comparison with MiCA and the US GENIUS Act

MiCA’s e-money token category is the closest EU analogy to UK fiat-backed payment stablecoins. MiCA requires e-money token issuers to be authorised as credit institutions or electronic money institutions under existing EU law — a route that leverages existing regulatory frameworks but imposes the corresponding capital and compliance requirements. The reserve requirements are detailed and prescriptive, including minimum proportions held in bank deposits and investment funds.

The US GENIUS Act — the Guiding and Establishing National Innovation for US Stablecoins Act — takes a federal framework approach that requires stablecoin issuers to obtain either federal or state-level licences, maintain 1:1 reserve backing in specified high-quality liquid assets, and prohibit the payment of yield to stablecoin holders. Its approach is more prescriptive than the UK’s on reserve composition but less prescriptive than MiCA on institutional structure.

The UK framework’s key differentiator from both is the combination of principles-based design with the Bank of England’s backstop role for systemic stablecoins — a structure that treats the monetary policy implications of large-scale stablecoin issuance more seriously than either MiCA or the GENIUS Act by ensuring the central bank retains oversight authority when scale warrants it.

For global stablecoin issuers, the UK framework adds a third major jurisdiction’s requirements to navigate. The practical question — whether the UK’s principles-based approach makes authorisation more or less demanding than MiCA or US licensing — will depend on the FCA’s application of its principles in individual authorisation decisions, which will only become clear as the October 2027 go-live approaches and the first applications are assessed.