How the UK Crypto Rulebook Compares With MiCA and the GENIUS Act

 

The UK completed a decisive shift in its approach to crypto within the space of a month. On June 22, the Bank of England abandoned its contested plan for individual stablecoin holding caps, replacing them with a 40 billion pound aggregate issuance ceiling per systemic sterling stablecoin. On June 30, the Financial Conduct Authority published its final cryptoasset rulebook, cutting the capital requirement for stablecoin issuers from a proposed 2% to 1% of issuance. The authorization gateway opens September 30, 2026, and the full mandatory regime takes effect October 25, 2027. With that, all three major financial jurisdictions now have their stablecoin rules in place, MiCA is live in the EU, the GENIUS Act is law in the US, and the UK framework is final. The differences across capital, reserves, size limits and supervisory architecture will determine where issuers domicile their businesses and shape the geography of the global stablecoin market for years.

 

 

 

The Bank of England dropped its proposed holding caps of 20,000 pounds per individual and 10 million pounds per business on June 22, replacing them with a temporary 40 billion pound (about $53 billion) aggregate issuance cap per systemic sterling stablecoin, to be raised and eventually removed over time.

 

The FCA's final rulebook, published June 30, cuts the capital requirement for qualifying stablecoin issuers from a proposed 2% to 1% of issued value, while extending redemption timelines and removing some disclosure obligations.

 

The authorization gateway opens September 30, 2026, applications close February 28, 2027, and the mandatory regime takes effect October 25, 2027, bringing trading, custody, lending and stablecoin issuance under a single FCA licensing system.

 

Versus MiCA, the UK framework covers only sterling denominated stablecoins, splits supervision between the FCA and the Bank of England, and manages scale through an aggregate cap rather than MiCA style usage limits.

 

Versus the GENIUS Act, the UK retains a percentage of issuance capital coefficient where the US leans toward flat capital requirements, and the GENIUS Act imposes no issuance size ceiling on any stablecoin.

 

 

The signal in this policy shift matters more than any single clause. Cregis's framework review traces how the Bank of England's November 2025 consultation had proposed a distinctly cautious regime, holdings of a systemic sterling stablecoin capped at 20,000 pounds per individual and 10 million pounds per business, with issuers required to park a substantial share of reserves in unremunerated central bank deposits. Industry pushback centered on a technical reality, a single user can hold the same stablecoin across multiple wallets and venues simultaneously, leaving issuers with no reliable way to track aggregate holdings, which made per user caps unenforceable in practice.

 

On June 22, the central bank published revised rules, scrapping the holding caps entirely in favor of a 40 billion pound aggregate issuance ceiling per systemic coin, which it considers equivalent in effect but far simpler to administer, with an explicit commitment to raise and eventually remove the cap as the market matures. A week later, the FCA's final rulebook continued in the same direction.

 

 

Reuters reported that after industry consultation, the FCA reduced the capital requirement for stablecoin issuers from a proposed 2% to 1% of the total value of stablecoins issued. David Geale, the FCA's executive director for payments and digital finance, was blunt about the reason, feedback indicated the starting point was simply too high. Beyond the capital coefficient, the FCA extended redemption timing requirements and removed certain public disclosure obligations. The Fintech Times quoted The Payments Association's policy director calling the halved capital coefficient the most important element of the package and a major victory for proportionality.

 

 

The framework's skeleton is a two tier supervisory line plus a timetable. Yahoo Finance's summary shows that ordinary issuers of sterling denominated stablecoins sit with the FCA, subject to the 1% capital requirement and annual stress tests using internally designed models submitted for FCA review, while stablecoins designated systemic by the Treasury move to a tougher Bank of England led regime bounded by the 40 billion pound issuance cap, with the FCA and the Bank planning a dedicated consultation on systemic issuers during 2026.

 

On timing, the authorization gateway opens September 30, 2026, the application window runs to February 28, 2027, and the mandatory regime takes effect October 25, 2027. At that point, exchanges, custodians, lending platforms and stablecoin issuers come under a single FCA licensing system for the first time, alongside a dedicated crypto market abuse regime and disclosure rules.

 

 

 

MiCA's stablecoin rules cover all e-money tokens and asset referenced tokens issued or circulating in the EU regardless of the currency they track, meaning dollar stablecoins operating in the bloc need compliance too. The UK framework governs only the issuance of sterling denominated stablecoins, a far narrower perimeter. Architecturally, MiCA runs through national regulators with significant tokens escalating to the European Banking Authority, while the UK splits duties between the FCA and the Bank of England, with the Treasury deciding what counts as systemic.

 

 

This is the most interesting divergence. MiCA restrains non euro stablecoins through usage limits, requiring issuers to halt new issuance once a token's use in euro area payments crosses defined thresholds for daily transaction counts and value. The UK instead caps the outstanding stock of a systemic coin at 40 billion pounds regardless of how it is used. MiCA polices purpose while the UK polices quantity, the former trying to keep stablecoins out of the payment system, the latter trying to bound their aggregate footprint in financial stability terms. For issuers, the UK cap is more transparent and predictable, but it is also a harder ceiling.

 

 

MiCA's own funds and reserve rules are likewise proportional, with significant tokens facing higher shares of reserves held at credit institutions. The UK's 1% coefficient, after the cut, sits broadly in line with international practice, though the head of sterling stablecoin issuer BCP Technologies publicly argued that even 1% remains challenging and noted that US rules are likely to adopt flat capital requirements, a criticism that captures the core UK versus US difference in approach.

 

 

The GENIUS Act, signed into US law in July 2025, takes a chartering route. Payment stablecoins may only be issued by bank subsidiaries, federally chartered nonbank issuers, or smaller state regulated issuers, reserves must be held one to one in cash and short term Treasuries and similar high quality liquid assets, reserve composition must be disclosed regularly, and paying interest to holders is prohibited.

 

Against the UK framework, three differences stand out. First, the US imposes no issuance size ceiling on any stablecoin, so the combined issuance of Tether and Circle, above two hundred billion dollars, poses no obstacle under US rules while the same scale would exceed the UK's 40 billion pound cap several times over. Second, US capital requirements are expected to take flat form rather than a percentage of issuance, friendlier to large issuers. Third, the US framework naturally serves dollar stablecoins, roughly 99% of the global market, while the UK framework serves sterling stablecoins, currently a tiny fraction of it. Rule strictness is only one variable. The disparity in market base is the more fundamental gap in the transatlantic contest.

 

 

For issuers, the UK's appeal has improved at the margin but comes with a visible ceiling. The 1% coefficient, a predictable authorization process and London's financial infrastructure are positives. The 40 billion pound cap, an October 2027 start date and sterling's limited share of international payments are negatives. The rational configuration for global issuers is likely a US GENIUS base, a MiCA license for EU coverage, and the UK as a complementary venue for sterling business and institutional settlement use cases.

 

For ordinary investors, the direct effect of finalized rules is greater credibility and supply of sterling stablecoins, with regulated sterling options gradually appearing in cross border payments and tokenized settlement. The compliance wave across jurisdictions is also lowering systemic risk in crypto broadly, since the transparency and redeemability of the assets underpinning USDT and USDC denominated trading pairs on major platforms such as MEXC are improving systematically as these laws take hold.

 

 

 

 

First, the dedicated rules for systemic issuers, with an FCA and Bank of England consultation due in 2026, where the reserve composition requirements, especially whether unremunerated central bank deposits survive, will determine the commercial viability of systemic sterling stablecoins. Second, the trajectory of the 40 billion pound cap, which the Bank has promised to raise and eventually remove without giving a schedule, since the pace of that increase effectively sets the growth rate of the sterling stablecoin ecosystem. Third, the companion rules for DeFi and tokenization, with the FCA having flagged consultations on decentralized finance guidance and operational resilience standards for distributed ledger technology.

 

 

Politically, Coin Insider noted that the transition following Prime Minister Keir Starmer's resignation adds uncertainty to the remaining rulemaking, and crypto policy is not a cross party consensus issue in the UK. Competitively, an October 2027 start means the UK opens for business two to three years behind the US and EU, and path dependence in issuers, liquidity and talent is hard to reverse once formed. Operationally, coordination costs between the FCA and the Bank under the two tier structure, and the gray zone around what qualifies as systemic, could generate friction in implementation.

 

 

What genuinely matters in the UK's shift is not any single clause but a change in regulatory methodology. Retreating from holding caps to issuance caps, and from 2% to 1%, amounts to regulators conceding a reality, that for a global, freely transferable asset like a stablecoin, user side controls are technically unenforceable and the only workable lever is the issuance side. That insight has direct reference value for jurisdictions still drafting rules, including several Asian financial centers.

 

The likeliest misreading is to interpret the UK's softening as a bid to take the stablecoin market from the US. The real configuration of the three frameworks is closer to division of labor than competition. The GENIUS Act entrenches dollar stablecoin dominance globally, MiCA builds a defensive perimeter for the EU, and the UK framework's practical aim is to give London's wholesale finance and tokenized settlement businesses a compliant sterling instrument. The 40 billion pound cap itself says the Bank of England wants a controlled institutional test bed, not a mass retail stablecoin market.

 

What investors should watch next is not the rule text but the applicant list. Once the gateway opens on September 30, 2026, which institutions file for sterling stablecoin issuance licenses, and above all whether incumbent banks and payment giants step in, will say more about this framework's commercial pull than any policy commentary.

 

The broader lesson for crypto is that the global stablecoin regulatory jigsaw is nearly complete, and the industry's competitive dimension is shifting from where business is permitted to where it runs most efficiently. Compliance costs, capital coefficients, reserve yields and license portability are becoming the core financial variables for issuers. Stablecoins are turning into a regulated money market fund business, and that transformation is decisive for the institutionalization of the entire crypto market.

 

 

 

The framework has two tiers. Ordinary issuers of sterling denominated stablecoins are supervised by the FCA, with capital equal to 1% of issuance, annual stress tests, and redemption and disclosure rules. Stablecoins designated systemic by the Treasury move to a tougher Bank of England regime bounded by a 40 billion pound aggregate issuance cap. Authorization applications open September 30, 2026, and the full regime becomes mandatory on October 25, 2027, alongside unified licensing for trading, custody and lending.

 

 

The original plan capped holdings of a systemic stablecoin at 20,000 pounds per individual and 10 million pounds per business, but industry feedback showed the rule was unenforceable, since one user can hold the same coin across multiple wallets and venues with no reliable way for issuers to track aggregate positions. On June 22 the Bank replaced the caps with a 40 billion pound aggregate issuance ceiling per systemic coin, judging it equivalent in effect but far simpler to administer, with a commitment to raise and eventually remove it.

 

 

Three differences stand out. On scope, MiCA governs all stablecoins circulating in the EU while the UK governs only sterling denominated issuance. On scale controls, MiCA imposes payment usage limits on non euro stablecoins while the UK sets a direct 40 billion pound stock cap on systemic coins. On architecture, MiCA runs through national regulators with escalation to the European Banking Authority, while the UK splits supervision between the FCA and the Bank of England. In short, MiCA polices purpose and the UK polices quantity.

 

 

The GENIUS Act uses a chartering model, restricting issuance to bank subsidiaries, federally chartered nonbanks and smaller state regulated issuers, with one to one reserves in cash and short term Treasuries, regular reserve disclosures and a ban on paying interest to holders, and it imposes no size ceiling on issuance. The UK keeps a 1% of issuance capital coefficient and caps systemic coins at 40 billion pounds. The more fundamental difference is market base, with dollar stablecoins near 99% of the global market versus sterling's tiny share.

 

 

Direct effects are limited. The FCA's issuance rules cover only sterling denominated stablecoins, so USDT and USDC issuance falls outside their perimeter. Once the full framework takes effect, however, exchanges and custodians serving UK users will need FCA authorization, so the distribution and use of dollar stablecoins in the UK market will face compliance requirements indirectly. For the two major issuers, the main arenas remain GENIUS Act and MiCA compliance.

 

 

No special action is needed, but two developments are worth tracking. On service availability, platforms that fail to apply or win authorization during the September 2026 to February 2027 window will be unable to continue serving UK users, so UK based investors should check whether their platforms are in the applicant pool. On product supply, regulated sterling stablecoins will add compliant options for cross border payments and tokenized settlement. Overall, the regime raises market transparency and asset redeemability, a long term positive for investors.

 

 

This content is provided for informational purposes only and does not constitute investment advice, financial advice, legal advice, tax advice or a recommendation to buy or sell any asset. Prices of crypto assets, equities and other financial instruments are highly volatile, and regulatory changes can materially affect related assets and businesses. Past performance is not indicative of future results. The data and information cited here are drawn from public sources and, with regulatory detail still evolving, are not guaranteed to be complete or current. Users should conduct their own research, assess their individual risk tolerance and consult licensed professionals where appropriate before making any investment or compliance decision. The MEXC Crypto Pulse Team accepts no liability for any direct or indirect losses arising from the use of or reliance on this content.

 

 

The MEXC Crypto Pulse Team focuses on crypto market trends, on-chain narratives, fintech developments, and digital asset ecosystem research. The team tracks public market data, company announcements, third-party market platforms, and industry news sources to help users better understand market structure, risks, and opportunities.

 

 

 

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