Where the Regime Sits Now
The UK stablecoin trajectory has been long. HM Treasury's response to the consultation on the UK's future financial services regulatory regime for cryptoassets ran through 2023 and 2024. The FCA published CP25/14 on the broader cryptoasset regime and CP25/15 on the stablecoin-specific provisions during 2025. PS26/6, published on 30 June 2026, brings the two together as final rules. The regime is now moving into implementation.
Two categories of firm are directly in scope. First, UK-based issuers of fiat-referenced stablecoins used in payments or as a store of value. Second, UK firms providing services related to those stablecoins — custody, exchange, transfer, on-ramp/off-ramp. For firms that also hold e-money authorisation, the FCA has clarified the interaction: an e-money token issued under the FSMA regime remains e-money for regulatory-perimeter purposes but must additionally meet the FSMA stablecoin standards.
Reserve Backing: The Financial Discipline
The central financial commitment of the regime is on reserve backing. Every stablecoin in issue must be matched, at all times, by high-quality liquid assets held in segregated custody, with reserves refreshed daily to the outstanding token supply. The specifics that CFOs need to model:
The economic implication is significant. In the 2023 rate environment, holding £100 million of reserves in HQLA generated £5 million per annum in yield, which materially funded issuer operations. At April 2026 rates (approximately 3.75 per cent), the same reserve base yields approximately £3.75 million, and if the BoE reaches the expected 3.0 to 3.5 per cent terminal rate, the yield falls further. Stablecoin business models built on 2023 assumptions need to reforecast reserve income at 2026 rate levels, and possibly at lower levels through 2027.
Custody and Segregation
Reserves must be held in segregated accounts at a permitted custodian, with clear legal segregation from the issuer's own assets. The FCA's final rules confirm that the segregation must survive an insolvency event of the issuer — token holders must have direct recourse to the reserve pool. This is a stricter standard than most e-money safeguarding arrangements have historically achieved, and it requires legal restructuring for firms whose current safeguarding uses commingled accounts.
The three specific requirements are:
- Legal trust or statutory trust structure. The reserve assets must be held on trust for token holders, with a trust document that names the token-holder pool as beneficiaries.
- Permitted custodian. The custodian must be authorised in the UK or an FCA-recognised equivalent jurisdiction, and must not be an affiliate of the issuer.
- Daily reconciliation with independent verification. A qualified independent third party must attest to the reserve balance at least monthly; the daily internal reconciliation must be auditable.
Redemption Rights: The Operational Commitment
Every token holder must have a legal right to redeem their tokens at par, in fiat, within one business day of a valid redemption request. This is a material operational commitment. Two features of the redemption regime require finance and operations planning.
Redemption Windows and Capacity
The one-business-day standard applies to normal-market conditions. The FCA has left room for issuers to specify redemption-window mechanics in periods of stress, but the base expectation is that redemption capacity must be maintained on a rolling basis. This means reserve liquidity — the portion of reserves in cash or overnight instruments — must be sufficient to meet plausible redemption spikes.
Redemption Cost Recovery
Issuers may charge for redemption only where the charge is cost-based (e.g. a fixed fee to cover payment rails) and disclosed in advance. Percentage-based redemption fees or discretionary "gating" fees are not permitted. This closes off a common source of issuer economics that was present in less-regulated stablecoin models.
"The UK stablecoin regime is closer to e-money-plus than to a novel category. Firms with existing e-money authorisation will find the transition manageable; firms operating stablecoin-adjacent products under lighter regimes will find the reserve, custody and redemption disciplines materially more demanding than their current baseline."
Disclosure and Reporting
The disclosure regime has three components: whitepaper at issuance, ongoing periodic disclosure, and reserve attestation.
- Issuance whitepaper. A prospectus-like document covering the token's structure, redemption rights, reserve composition, custodian arrangements, and issuer solvency. Must be filed with the FCA and published on the issuer's website.
- Ongoing periodic disclosure. Quarterly disclosure of total tokens in issue, reserve composition, reserve currency mix, and any material change in custodian or reserve manager. The specific templates are set out in PS26/6 Annex 4.
- Monthly reserve attestation. An independent third party must attest to the reserve balance being at or above the 1:1 threshold. The attestation must be published on the issuer's website within 15 business days of the attestation date.
For a CFO, the monthly attestation is the most process-heavy item. It requires monthly close discipline, custodian data feeds that can be reconciled by a third party, and an audit-quality trail on reserve composition. Firms should plan for a lead time of six to eight weeks to onboard an attestation provider once the reserve structure is in place.
Implementation Timeline
The regime phases in from Q4 2026 for new applications and Q2 2027 for existing firms transitioning under the temporary regime. For a CFO planning implementation:
Key Takeaways
- PS26/6 was published on 30 June 2026, finalising the UK stablecoin regime alongside the broader FSMA 2023 crypto rules. Implementation begins in Q4 2026 and completes 30 June 2027.
- Reserves must be held 1:1 at all times in HQLA (cash, overnight deposits, short-dated gilts, T-bills), with a recommended 2 per cent prudential buffer above the floor.
- Reserve yield at 3.75 per cent generates approximately £3.75 million per £100 million of reserves — materially less than the 2023 environment. Stablecoin business models built on peak-rate yield assumptions need to reforecast.
- Custody must be segregated in a trust structure at a permitted third-party custodian, with independent monthly attestation and daily internal reconciliation.
- Token holders must have a legal right to redeem at par within one business day, with only cost-based redemption fees permitted.
- Disclosure includes issuance whitepaper, quarterly periodic disclosure, and monthly reserve attestation published within 15 business days.
- Firms operating under the temporary permissions regime must achieve full authorisation by 30 June 2027. Plan the authorisation process for a six-month completion window, not twelve.