DeFi and the UK Regulatory Perimeter: What the FCA’s Activity-Based Approach Means
DeFi UK regulation sits at the crossroads of technology, market conduct and legal perimeter-setting. This explainer unpacks the UK authorities’ current statements, the practical logic behind an activity-based approach, and what firms, developers, users and observers should — and should not — take away from the regulators’ public positions. It uses only official FCA and HM Treasury material and related OneGeneration News reporting to explain the policy architecture, the questions regulators say they will use case by case, and the gaps that remain.
DeFi UK regulation: quick summary of the statutory framework
- The FCA has published a policy statement and final rules setting out its approach to cryptoassets and related activities; the FCA describes the Financial Services and Markets Act 2000 (Cryptoassets) Regulations 2026 as having passed Parliament on 4 February 2026. The FCA says the Regulations brought a broad range of cryptoasset activities into its regulatory perimeter beyond anti-money‑laundering and financial‑promotion standards, and that the full scope of regulated activities expands from 25 October 2027. (Source: FCA policy statement, 30 June 2026.)
- HM Treasury has explained the policy context for the new regime and said it published a draft statutory instrument, that it confirmed it would proceed broadly in line with earlier proposals, and that it laid final legislation in Parliament on 15 December 2025. HM Treasury’s summary describes new regulated activities including operating a cryptoasset trading platform and issuing a stablecoin, plus arrangements for admissions, disclosures and market abuse. (Source: HM Treasury policy note, updated 16 December 2025.)
- The FCA also published a discussion paper (DP25/1) on regulating cryptoasset activities in May 2025 and updated that material on 30 June 2026. The FCA describes DP25/1 as part of the historical policy development; it says views were sought on trading platforms, intermediaries, lending and borrowing, staking and decentralised finance. The FCA says final rules and guidance were published on 30 June 2026 and will apply to cryptoasset firms authorised under FSMA on or after 25 October 2027. (Source: FCA DP25/1.)
- Separate from the new perimeter rules, the FCA has set out that financial‑promotion rules already apply to cryptoasset marketing to UK consumers regardless of where a firm is based or the technology used, and that the FCA describes four lawful communication routes for cryptoasset promotions. The FCA additionally states that cryptoassets remain high risk and that the market will be largely unregulated even after this regime comes into force. (Source: FCA guidance on marketing to UK consumers.)
What the FCA says about DeFi UK regulation
- The FCA’s policy statement sets out the authority’s position on cryptoasset activities and explicitly addresses DeFi as a subject of its rules and guidance work. The FCA says its rules and guidance will apply to DeFi firms where there is an identifiable controlling entity, consistent with the perimeter defined by HM Treasury. The FCA describes its approach to DeFi as case by case: scope will be assessed in light of the facts and particular arrangements in each situation. (Source: FCA policy statement, 30 June 2026.)
- The FCA says it will consult on tailored DeFi guidance, including objective indicators of decentralisation and expectations on operational resilience and financial‑crime risk. The FCA states that the aim of that consultation will be to avoid unnecessarily prescriptive rules that could hinder innovation. The FCA frames this as an effort to balance regulatory obligations with preserving constructive technologies where appropriate. (Source: FCA policy statement, 30 June 2026.)
- The FCA lists activity‑specific rules for trading platforms, intermediaries, custody, lending and borrowing, and staking; it links those categories to its broader supervisory framework. The FCA also sets out that the full scope of regulated activities expands from 25 October 2027 under the statutory Regulations. (Source: FCA policy statement, 30 June 2026.)
Why a label is not a perimeter answer
- The FCA’s material emphasises regulated activity rather than labels. The authority’s published position repeatedly describes the legal perimeter as activity‑driven and contingent on whether a given arrangement meets the statutory and regulatory definitions. The FCA says it will take a fact‑sensitive approach. That means simply calling something “DeFi” is not in itself presented as determinative of whether UK regulatory requirements apply. (Source: FCA policy statement, 30 June 2026.)
- The FCA’s use of an “identifiable controlling entity” test in its published statements shows why regulators are focusing on functions and relationships rather than names. The FCA expressly links its DeFi work to that concept; it says rules and guidance will apply where such an entity exists, consistent with the Treasury‑defined perimeter. But the FCA also says it will assess decentralisation and control on a case‑by‑case basis and consult on objective indicators. Do not treat the FCA’s comments as a checklist that concludes a real arrangement’s legal status. (Source: FCA policy statement, 30 June 2026.)
Activity-specific rules listed by the FCA (table)
| Activity area | What the FCA says (summary, as stated by the FCA) |
|---|---|
| Trading platforms | The FCA lists trading platforms as one activity for which it has activity‑specific rules. |
| Intermediaries | The FCA lists intermediaries as subject to activity‑specific rules. |
| Custody | The FCA lists custody as one activity covered by its rules and guidance. |
| Lending and borrowing | The FCA lists lending and borrowing as activity‑specific rules. |
| Staking | The FCA lists staking as an activity for which rules and guidance exist. |
Identifiable controlling entity: what the FCA highlights
- The FCA frequently refers to an “identifiable controlling entity” in its public statements about DeFi. The FCA says rules and guidance will apply to DeFi firms where such an entity is present and that this is consistent with the Treasury‑defined perimeter. The FCA adds that it will consider objective indicators of decentralisation in future work. (Source: FCA policy statement, 30 June 2026.)
- The FCA’s emphasis on this concept reflects the authority’s activity‑based approach: identifying who performs or controls regulated activities is central to determining whether those activities fall within the UK perimeter as set by statute and by FCA rules. The FCA does not in its statement provide a single formula; instead it signals consultation on tailored guidance to set out objective indicators. (Source: FCA policy statement, 30 June 2026.)
The FCA’s case-by-case approach and tailored guidance
- The FCA says it will take a case‑by‑case approach to scope. The authority explains that “DeFi” covers a wide range of architectures, arrangements and governance styles, and that a one‑size‑fits‑all approach could be inappropriate. Consequently, the FCA says it will consult on tailored guidance, including objective indicators of decentralisation and expectations on operational resilience and financial‑crime risks. (Source: FCA policy statement, 30 June 2026.)
- The FCA also says it aims to avoid unnecessarily prescriptive rules that could hinder innovation, indicating a preference in its statement for proportionate, targeted measures tied to particular risks and activities. The FCA’s public language frames this as a balance between regulatory protection and avoiding undue constraint on novel arrangements. (Source: FCA policy statement, 30 June 2026.)
DeFi UK regulation: a dated timeline
- November 2024: HM Treasury says it confirmed it would proceed broadly in line with earlier proposals. (Source: HM Treasury policy note.)
- April 2025: HM Treasury published draft statutory provisions. (Source: HM Treasury policy note.)
- 2 May 2025: The FCA published DP25/1, a discussion paper seeking views on approaches to trading platforms, intermediaries, lending and borrowing, staking and decentralised finance. (Source: FCA DP25/1.)
- 15 December 2025: HM Treasury says it laid final legislation in Parliament. (Source: HM Treasury policy note, updated 16 December 2025.)
- 4 February 2026: The FCA says the Financial Services and Markets Act 2000 (Cryptoassets) Regulations 2026 passed Parliament on this date. (Source: FCA policy statement, 30 June 2026.)
- 6 February 2026 (update date on FCA marketing guidance): The FCA updated its guidance on cryptoasset firms marketing to UK consumers. That page states that financial‑promotion rules apply to cryptoasset marketing to UK consumers regardless of where a firm is based or the technology used, and that cryptoassets remain high risk and that the market will be largely unregulated even after the regime comes into force. (Source: FCA marketing guidance, updated 6 February 2026.)
- 30 June 2026: The FCA published final rules and guidance and a policy statement describing its approach; the FCA also updated DP25/1 on this date and says the final rules and guidance will apply to cryptoasset firms authorised under FSMA on or after 25 October 2027. (Sources: FCA policy statement and DP25/1 update, 30 June 2026.)
- 25 October 2027: The FCA says the full scope of regulated activities expands from this date under the Regulations. (Source: FCA policy statement, 30 June 2026.)
How the Treasury framed the regulated activities (policy context)
- HM Treasury’s policy note summarises the legislative intent behind the new regime. HM Treasury says it confirmed the approach in November 2024, published draft provisions in April 2025, and laid final legislation in Parliament on 15 December 2025. The Treasury’s summary highlights that the regime will create new regulated activities for cryptoassets, including operating a cryptoasset trading platform and issuing a stablecoin, and that it will add admissions, disclosures and market‑abuse arrangements. The document is presented as legislative policy context and not as a substitute for case‑specific legal analysis. (Source: HM Treasury policy note, updated 16 December 2025.)
The role of DP25/1 in the policy story
- The FCA’s discussion paper DP25/1 (published 2 May 2025 and updated 30 June 2026) is described by the FCA as historical policy development context. The FCA says DP25/1 sought views on its approach to trading platforms, intermediaries, cryptoasset lending and borrowing, staking and decentralised finance. The FCA states in its later publications that final rules and guidance were published on 30 June 2026 and will apply to firms authorised under FSMA on or after 25 October 2027. The FCA’s public material frames DP25/1 as part of the consultation and development process rather than as the final rulebook. (Source: FCA DP25/1.)
Financial promotions as a separate DeFi UK regulation question
- The FCA’s guidance on marketing makes a clear distinction between the perimeter rules that flow from the new Regulations and the pre‑existing financial‑promotion regime. The FCA states that financial‑promotion rules already apply to cryptoasset marketing to UK consumers regardless of where the promoter is based or what technology is used. The FCA describes the forms of communication that can fall within the financial‑promotion definition and flags that compliance with the relevant routes is required for lawful promotions. The FCA also states that cryptoassets remain high risk and that the market will be largely unregulated even after this regime comes into force, underscoring that marketing rules are an existing overlay that operates independently of the new activity definitions. (Source: FCA guidance on marketing to UK consumers, updated 6 February 2026.)
Four lawful routes: what the FCA describes (high level)
| Topic | What the FCA says (high level) |
|---|---|
| Financial‑promotion reach | The FCA says financial‑promotion rules apply to cryptoasset marketing to UK consumers regardless of where a firm is based or the technology used. |
| Forms of communication | The FCA lists websites, mobile apps, social‑media posts and online advertising as examples that can fall within the financial‑promotion definition. |
| Lawful communication routes | The FCA says there are four lawful communication routes for cryptoasset promotions that must be complied with where relevant; the FCA’s guidance describes those routes. |
| Compliance expectation | The FCA says promotions through the relevant lawful routes must comply with FCA rules. |
| Risk statement | The FCA says cryptoassets remain high risk and that the market will be largely unregulated even after the regime takes effect. |
| (Source: FCA page on cryptoasset firms marketing to UK consumers, updated 6 February 2026.) |
Operational resilience and financial‑crime risks in FCA statements
- The FCA explicitly links DeFi guidance to expectations on operational resilience and financial‑crime risk. The authority says it will consult on tailored DeFi guidance that includes expectations in both areas and will consider objective indicators of decentralisation as part of that work. The FCA frames these risks as central to how it will assess the presence and impact of regulated activity in decentralised arrangements. (Source: FCA policy statement, 30 June 2026.)
- At the same time the FCA says it will aim to avoid unnecessarily prescriptive rules that could hinder innovation. The FCA’s public material therefore signals that any measures addressing operational resilience and financial‑crime risk will be considered in light of proportionality and the specific attributes of the arrangements under review. (Source: FCA policy statement, 30 June 2026.)
Hypothetical comparison: why facts and control can matter (labelled hypothetical — cannot determine real status)
The following hypothetical is provided to illustrate the FCA’s stated reasoning on why control and activity matter. This is an abstract comparison only and cannot be used to determine the UK regulatory status of any real arrangement.
| Element | Hypothetical A (centralised functions) | Hypothetical B (distributed functions) |
|---|---|---|
| Governance and decision‑making | Decisions taken by a named, identifiable body that directs operational matters and can be contacted | Decisions taken by dispersed token‑holders and code‑based mechanisms with no single named controller |
| Role in value transfer | A party processes trades and holds customer assets on behalf of users | Smart contracts execute transfers based on code; no single party routinely holds customer assets |
| Points of contact for regulatory obligations | A clear entity exists for licensing, supervision and compliance responsibilities | No single legal entity exists that can carry the standard obligations; multiple contributors and participants are involved |
| How the FCA says it would approach scope | The FCA’s statement indicates that rules and guidance will apply where there is an identifiable controlling entity; such a fact pattern feeds into a perimeter assessment | The FCA says it will take a case‑by‑case approach and consult on objective indicators of decentralisation; distributed arrangements will be assessed on their facts |
Note: The table is a labelled hypothetical offered to explain why the FCA focuses on facts such as control and activity. The FCA’s public statements do not use any single hypothetical or checklist to determine legal status; the table cannot determine the UK regulatory status of any real arrangement. (Source: FCA policy statement, 30 June 2026.)
Myth-versus-distinction table
| Common claim or myth | What the FCA or HM Treasury says (distinction) |
|---|---|
| “If it’s called DeFi, it’s outside the UK perimeter.” (Myth) | The FCA says a label alone is not a perimeter answer. The authority will look at whether regulated activity is being carried out and whether there is an identifiable controlling entity, taking a case‑by‑case approach. (Source: FCA policy statement, 30 June 2026.) |
| “A DeFi label automatically means no controlling entity.” (Myth) | The FCA points to the concept of an identifiable controlling entity and says rules and guidance will apply where such an entity exists; the question is factual and not resolved by terminology alone. (Source: FCA policy statement, 30 June 2026.) |
| “Financial promotions won’t apply to decentralised systems.” (Myth) | The FCA says financial‑promotion rules apply to cryptoasset marketing to UK consumers regardless of where a firm is based or the technology used; forms of communication such as websites, apps and social media can be captured. (Source: FCA marketing guidance, updated 6 February 2026.) |
| “DP25/1 was the final rulebook.” (Myth) | The FCA describes DP25/1 as a discussion paper that sought views; the FCA also says final rules and guidance were published on 30 June 2026 and DP25/1 should be treated as historical policy development context. (Source: FCA DP25/1, updated 30 June 2026.) |
| “Everything changes on one date in 2027.” (Myth) | The FCA says the full scope of regulated activities expands from 25 October 2027 under the Regulations; HM Treasury has set out the draft SI and policy context. Understanding of what is in scope before and after that date depends on the statutory and regulatory definitions and on FCA guidance. (Sources: FCA policy statement, 30 June 2026; HM Treasury policy note, updated 16 December 2025.) |
What a reader should not infer
- Do not infer from the FCA’s statements that any particular system, protocol, token, smart contract, wallet, participant, developer, DAO or person is authorised, exempt, unregulated, compliant, unlawful, safe, or within the UK regulatory perimeter. The FCA’s public materials emphasise case‑by‑case assessment and identifiable controlling entities; they do not make blanket determinations about named real‑world arrangements. (Source: FCA policy statement, 30 June 2026.)
- Do not treat the FCA’s consultation on objective indicators of decentralisation as a definitive checklist. The FCA says it will consult on guidance and indicators; until such guidance is final and considered with the statutory text, the regulator’s statements are a signalling of approach rather than a substitute for legal or compliance advice on specific facts. (Source: FCA policy statement, 30 June 2026.)
- Do not assume that marketing to UK consumers is outside the FCA’s reach because an arrangement is decentralised or because promotion occurs outside the UK. The FCA says financial‑promotion rules apply to cryptoasset marketing to UK consumers regardless of where a promoter is based or the technology used. (Source: FCA marketing guidance, updated 6 February 2026.)
- Do not assume that the market will be comprehensively regulated after the new regime. The FCA explicitly says that cryptoassets remain high risk and that the market will be largely unregulated even after the regime comes into force. (Source: FCA marketing guidance, updated 6 February 2026.)
Questions to ask before acting
The FCA and HM Treasury documents suggest areas of factual inquiry that matter when assessing whether UK regulatory obligations might arise. The following questions are intended as general prompts for due diligence, not as a substitute for professional advice.
| Topic area | Example questions (fact‑gathering prompts) |
|---|---|
| Who performs regulated activities? | Which parties perform functions that the Regulations list as regulated activities (for example, operating trading platforms, custody, lending)? Who is contractually or practically responsible? (Sources: FCA policy statement; HM Treasury policy note.) |
| Is there an identifiable controlling entity? | Is there a named organisation or jurisdiction where responsibility is concentrated? Who would be the contact point for supervision or enforcement? (Source: FCA policy statement.) |
| What are the governance and decision pathways? | How are operational decisions made and executed? Are there on‑chain or off‑chain governance processes that create practical control points? (Source: FCA policy statement.) |
| How are assets handled and who has custody? | Where do assets reside during activity? Which party — if any — has custody or de‑facto control of customer assets? (Source: FCA policy statement.) |
| Where and how are customers marketed to? | Are marketing communications likely to reach UK consumers? Do communications fall within the financial‑promotion definition as described by the FCA? (Source: FCA marketing guidance, updated 6 February 2026.) |
| What resilience and anti‑financial‑crime measures exist? | What operational resilience, AML/CFT and KYC arrangements are in place and who is responsible for them? Are they consistent with the expectations the FCA says it will consult on? (Source: FCA policy statement.) |
| Timing and transitional position | Does the activity fall before or after the FCA’s stated expansion of scope from 25 October 2027? How do the statutory timelines described by Treasury and the FCA affect preparatory steps? (Sources: HM Treasury policy note; FCA policy statement.) |
This explainer sets out what the FCA and HM Treasury have said about how decentralised finance (DeFi) fits within the UK regulatory perimeter, and how a reader can check the primary sources. It uses only material published by the FCA and HM Treasury listed in the source pack. It does not determine the regulatory status of any particular protocol, person, service or communication; nor does it give legal, tax, investment or compliance advice. The FCA’s descriptions of regulatory approach are not themselves determinations about specific arrangements.
DeFi UK regulation: reading control, activity and communication as separate questions
The FCA’s published regime makes three distinct questions relevant when thinking about DeFi arrangements: who controls or operates the arrangement; what activity is being carried out; and how any communications about the arrangement are presented to UK audiences.
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Control: The FCA’s 30 June 2026 overview of the cryptoasset regime states that, for DeFi, rules and guidance apply where there is an identifiable controlling entity, and that scope is assessed on a case-by-case basis. The FCA says it will consult on objective indicators of decentralisation as part of the tailored guidance it plans to publish. That is an FCA description of the factors it will use to decide when a DeFi arrangement falls within regulatory requirements; it is not a conclusion about the status of any specific arrangement.
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Activity: HM Treasury’s policy note describes the new regulated activities that the legislative package creates and explains the broader legislative and policy context for those activities. The FCA overview records that the 2026 Cryptoassets Regulations brought a broad range of activities into the regulatory perimeter, and that the full scope of the regime expands on 25 October 2027. That dates and scope information are facts from the FCA and HM Treasury materials; whether a particular activity is within scope for a particular arrangement depends on applying those statutory and regulatory definitions to the facts of that arrangement.
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Communication (financial promotion): The FCA’s marketing guidance states that the financial-promotion regime applies to UK-facing cryptoasset marketing regardless of the location of the sender or the technology used. The FCA lists channels such as websites, apps, social media and online advertising as examples that can be caught by the financial-promotion rules. That is the FCA’s stated scope for communications; it does not by itself determine whether any given message does or does not meet the legal test in a particular case.
Readers should treat these three questions as analytically separate. The presence of an identifiable controlling entity is relevant to the application of some parts of the cryptoasset regime, but a marketing message aimed at UK consumers may be within the financial-promotion regime irrespective of whether a controlling entity is identifiable. Likewise, an activity that the HM Treasury and FCA describe as a regulated activity under the 2026 framework may only be engaged in by particular persons or arrangements subject to regulatory obligations depending on how the FCA’s case-by-case approach applies.
Neither this explainer nor the FCA sources determine the regulatory status of any particular protocol, person, service or communication.
Why future tailored guidance matters
The FCA’s materials make clear that some aspects of how the regime will operate for DeFi are intentionally subject to further work. The FCA says it will publish tailored guidance and will consult on objective indicators of decentralisation and expectations on operational resilience and financial-crime risk. That consultation is intended to set out the factors the FCA will consider when assessing whether a DeFi arrangement has an identifiable controlling entity and when, therefore, regulatory obligations apply.
There are two practical implications from the FCA’s stated approach:
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Clarifying indicators: The FCA proposes to consult on objective indicators of decentralisation. Those indicators, once consulted on and finalised, will help market participants and observers apply the FCA’s descriptive framework in particular cases. Until the FCA publishes that guidance, the FCA says scope for DeFi will continue to be judged on a case-by-case basis.
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Operational resilience and financial‑crime expectations: The FCA’s overview highlights expectations on operational resilience and financial-crime risk as areas where tailored guidance will set out the FCA’s supervisory approach for DeFi arrangements with identifiable controlling entities. The content and application of those expectations will be clarified through the FCA’s forthcoming consultation and guidance.
The FCA’s discussion paper DP25/1 (published in 2025) sought views on regulating cryptoasset activities, including DeFi, and the FCA’s policy position evolved into the final rules set out on 30 June 2026. The 30 June 2026 regime therefore incorporates the results of that earlier consultation work, while also committing to further tailored guidance specifically addressing how decentralisation is to be assessed and how resilience and financial-crime risk are to be treated.
These are FCA descriptions of planned policy and process. They explain the framework for decision-making; they are not the same as a determination about whether any particular arrangement, protocol, person or marketing communication meets the tests the FCA will apply.
Neither this explainer nor the FCA sources determine the regulatory status of any particular protocol, person, service or communication.
DeFi UK regulation: a reader’s source-checking framework
When reading statements about DeFi and the UK perimeter, a disciplined approach is to map questions to the specific primary-source passages that address them. The table below summarises which FCA or HM Treasury source addresses each line of inquiry and what that source says it is for.
| Question to ask | Source to consult | What that source addresses (as published) |
|---|---|---|
| Is there an identifiable controlling entity that may bring a DeFi arrangement into the perimeter? | FCA cryptoasset regime overview (30 June 2026) | The FCA states rules and guidance apply where there is an identifiable controlling entity and that scope is assessed case-by-case; the FCA will consult on objective indicators of decentralisation. |
| What activities have been brought into the regulatory perimeter and when? | FCA cryptoasset regime overview (30 June 2026) and HM Treasury policy note | The FCA says the 2026 Cryptoassets Regulations brought a broad range of activities into the perimeter and that full scope expands on 25 October 2027; HM Treasury’s policy note describes the new regulated activities and legislative-policy context. |
| How will the FCA set expectations on operational resilience and financial‑crime risk for DeFi? | FCA cryptoasset regime overview (30 June 2026) | The FCA states tailored guidance will set out expectations on operational resilience and financial‑crime risk for arrangements with identifiable controlling entities. |
| How are marketing and communications treated for UK audiences? | FCA marketing page (financial-promotion guidance) | The FCA states that the financial-promotion regime applies to UK-facing cryptoasset marketing regardless of location or technology, and lists websites, apps, social media and online advertising among applicable channels. |
| How did the FCA consult before finalising the approach? | FCA DP25/1 (2025) and the FCA’s 30 June 2026 materials | DP25/1 sought views in 2025 on DeFi and other cryptoasset activities; final rules were published 30 June 2026. |
Use that mapping to locate the source text and rely on the wording the FCA and HM Treasury used. Where the FCA says it will consult or will publish guidance, treat that as a policy process rather than a rule that immediately settles the status of any given arrangement.
A reader checking a concrete factual claim should therefore: (a) identify which of the three questions above the claim addresses; (b) find the corresponding passage in the FCA or HM Treasury documents cited; and (c) note whether the source is describing a current rule, a past consultation or a future consultation/guidance. This method keeps the distinction between descriptive source material and any independent conclusion about a specific case.
Neither this explainer nor the FCA sources determine the regulatory status of any particular protocol, person, service or communication.
DeFi UK regulation: editorial distinctions that keep the discussion precise
It is essential to distinguish two different kinds of statement that appear in the FCA and HM Treasury materials:
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Statements about regulatory approach and process. These include the FCA’s description that rules and guidance apply where there is an identifiable controlling entity, that scope is judged case by case, that tailored guidance will address decentralisation indicators and resilience/financial‑crime expectations, and that the 2026 Regulations expanded the perimeter with full scope expanding on 25 October 2027. They also include HM Treasury’s description of the new regulated activities and the legislative-policy context, and the FCA’s guidance on the geographical and technological reach of the financial-promotion regime. These are descriptions of how the regulators propose to apply or have applied policy and law.
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Determinations about the status of particular arrangements. These would be conclusions about whether a named protocol, person, service or message is or is not within the regulatory perimeter. The FCA and HM Treasury documents in the source pack explain approach, timing and consultation plans; they do not, in the material used here, issue determinations about specific named arrangements.
An FCA description of its regulatory approach is not the same as a conclusion about a real arrangement because the former states the tests and supervisory expectations that the FCA will apply, while the latter requires applying those tests to the particular factual matrix of an arrangement. This explainer summarises the FCA’s and HM Treasury’s published approaches; it does not apply those approaches to decide the status of any protocol, person, service or communication.
Finally, a practical editorial rule: whenever a claim would require applying law to live facts to decide regulatory status, refrain from drawing that conclusion here. Use the FCA and HM Treasury materials to explain the tests and processes the UK authorities have published. Avoid saying that any named or unnamed arrangement is or is not regulated. Repeating for emphasis: neither this explainer nor the FCA sources determine the regulatory status of any particular protocol, person, service or communication.
What this does not tell a reader
- This explainer does not provide legal or compliance advice. It summarises and organises the public statements of the FCA and HM Treasury so readers can understand the authorities’ current framing. Use the primary sources if you need a precise legal view; this article does not interpret statutory text beyond the regulators’ own descriptions. (Sources: FCA policy statement; HM Treasury policy note.)
- This explainer does not assess or determine whether any real‑world arrangement, person, product or service is inside or outside the UK regulatory perimeter. The FCA’s material itself frames scope as case by case and dependent on facts such as identifiable controlling entities. Only a fact‑sensitive regulatory or judicial process can resolve the status of a given real arrangement. (Source: FCA policy statement.)
- This explainer does not catalogue enforcement history, nor does it rely on or cite enforcement cases, market statistics, or provider examples. It uses only the FCA and HM Treasury primary‑source statements and OneGeneration News links listed in the Sources and Related Coverage sections.
Explanatory table: the perimeter architecture as presented by the authorities
| Layer | How it is described by the FCA or HM Treasury |
|---|---|
| Statutory definitions | HM Treasury’s policy note describes draft and final provisions creating new regulated activities (e.g. trading platforms, stablecoin issuance) as part of the legislative context. (Source: HM Treasury policy note.) |
| FCA activity rules and guidance | The FCA states it has activity‑specific rules for trading platforms, intermediaries, custody, lending and borrowing, and staking, and that it published final rules and guidance on 30 June 2026. (Source: FCA policy statement.) |
| DeFi treatment | The FCA says it will apply rules and guidance to DeFi firms where there is an identifiable controlling entity and will consult on objective indicators of decentralisation and expectations on resilience and financial‑crime risk. (Source: FCA policy statement.) |
| Financial promotions overlay | The FCA says financial‑promotion rules already apply broadly to cryptoasset marketing to UK consumers regardless of location or technology, and describes four lawful communication routes that must be complied with. (Source: FCA marketing guidance.) |
| Time and scope | The FCA states the full scope of regulated activities expands from 25 October 2027 and that final rules will apply to firms authorised under FSMA on or after that date. (Source: FCA policy statement and DP25/1 update.) |
Explanatory table: policy development milestones (concise)
| Action or document | What the authority says |
|---|---|
| HM Treasury draft SI (April 2025) | HM Treasury published draft statutory provisions as part of the policy process. (Source: HM Treasury policy note.) |
| FCA discussion paper DP25/1 (2 May 2025) | The FCA sought views on trading platforms, intermediaries, lending and borrowing, staking and DeFi; DP25/1 is described as historical policy development context. (Source: FCA DP25/1.) |
| HM Treasury laid final legislation (15 December 2025) | HM Treasury says it laid final legislation in Parliament on this date. (Source: HM Treasury policy note.) |
| FCA marketing guidance update (6 February 2026) | The FCA refreshed guidance on cryptoasset marketing to UK consumers and emphasised financial‑promotion rules apply regardless of promoter location or technology. (Source: FCA marketing guidance.) |
| FCA policy statement and final rules (30 June 2026) | The FCA published a policy statement, final rules and guidance, and an update to DP25/1; the FCA describes the Regulations as having passed Parliament on 4 February 2026 and says full scope expands from 25 October 2027. (Source: FCA policy statement and DP25/1 update.) |
FAQ (concise)
Q: Does DeFi UK regulation mean all DeFi activity is outside the UK perimeter?
A: No. The FCA says it will apply rules and guidance to DeFi firms where there is an identifiable controlling entity and will assess arrangements case by case. The authority’s public material does not treat the DeFi label as determinative. (Source: FCA policy statement, 30 June 2026.)
Q: Are financial promotions already covered by FCA rules?
A: Yes. The FCA states financial‑promotion rules apply to cryptoasset marketing to UK consumers regardless of where a firm is based or the technology used. The FCA describes four lawful communication routes and says promotions via those routes must comply with FCA rules. (Source: FCA marketing guidance, updated 6 February 2026.)
Q: When does the expanded scope take effect?
A: The FCA says the full scope of regulated activities expands from 25 October 2027. The FCA also says final rules and guidance were published on 30 June 2026 and will apply to cryptoasset firms authorised under FSMA on or after 25 October 2027. (Source: FCA policy statement; DP25/1 update.)
Q: What did HM Treasury say about new regulated activities?
A: HM Treasury’s policy note says the regime will create new regulated activities for cryptoassets, including operating a cryptoasset trading platform and issuing a stablecoin, and will address admissions, disclosures and market‑abuse arrangements. (Source: HM Treasury policy note, updated 16 December 2025.)
Q: Will the FCA impose a single decentralisation test?
A: The FCA says it will consult on tailored DeFi guidance including objective indicators of decentralisation; it also says it will take a case‑by‑case approach. The FCA does not, in its published statements, present a single conclusive test. (Source: FCA policy statement, 30 June 2026.)
Practical context: preparing without overreading the guidance
- If you are considering activities that might touch the UK perimeter, the FCA’s published material suggests focusing on the factual questions listed earlier: who performs regulated activities, where the practical control points are, who is responsible for custody, how marketing reaches UK consumers, and what resilience and AML/CFT measures are in place. The FCA’s statements indicate these are the kinds of facts that matter to the authority when assessing scope. (Source: FCA policy statement; FCA marketing guidance.)
- Keep in mind the FCA’s repeated emphasis on case‑by‑case assessment and the stated intention to consult on tailored guidance. That suggests working with legal and compliance advisers to document factual positions and to monitor the FCA’s future consultations and guidance for any objective indicators it publishes. (Source: FCA policy statement, 30 June 2026.)
Explanatory table: who should pay attention and why (high level)
| Stakeholder | Why the FCA/HM Treasury statements matter |
|---|---|
| Operators of trading platforms | The FCA lists trading platforms as an activity area and HM Treasury identified operating a cryptoasset trading platform as a new regulated activity in its policy summary. (Sources: FCA policy statement; HM Treasury policy note.) |
| Custody service providers | The FCA lists custody among its activity‑specific rules and highlights the need to consider custody arrangements in perimeter assessments. (Source: FCA policy statement.) |
| Lenders and borrowers | The FCA lists lending and borrowing as activity‑specific rules; these activities are referenced in DP25/1 and the FCA’s final rules. (Sources: FCA DP25/1; FCA policy statement.) |
| Staking service providers | The FCA includes staking among activity areas and says it will publish rules and guidance covering staking. (Source: FCA policy statement.) |
| Marketers and platforms reaching UK consumers | The FCA states that financial‑promotion rules apply to cryptoasset marketing to UK consumers regardless of where a firm is based or the technology used; this is a separate, existing obligation. (Source: FCA marketing guidance.) |
| Developers and governance participants | The FCA’s case‑by‑case approach and focus on identifiable controlling entities mean developers and governance contributors should understand how their roles may be viewed in factual assessments. (Source: FCA policy statement.) |
Conclusion and no‑advice notice
DeFi UK regulation, as described in the FCA’s and HM Treasury’s public statements, is rooted in an activity‑based approach. The FCA says its perimeter decisions will look to the facts of who performs regulated activities, whether there is an identifiable controlling entity, and how decentralisation, operational resilience and financial‑crime risks present themselves in particular arrangements. The Treasury’s policy material sets legislative context for regulated activities such as trading platforms and stablecoin issuance. Financial‑promotion rules are presented by the FCA as an existing, separate overlay that applies broadly to marketing to UK consumers.
None of the authorities’ statements in the sources cited here resolves whether any named or unnamed real‑world arrangement is or is not within the UK regulatory perimeter; the FCA’s material emphasises a case‑by‑case approach and consultation on objective indicators. This article is neutral journalism and general information only. It does not constitute legal, tax, investment, or compliance advice. If you need a determination about a specific arrangement, consult qualified legal or regulatory advisers and the primary sources cited below.
Sources
- FCA overview of cryptoassets regime policy statements, published 30 June 2026: FCA: overview of cryptoassets regime policy statements
- FCA DP25/1: Regulating cryptoasset activities, 2 May 2025, updated 30 June 2026: FCA DP25/1: Regulating cryptoasset activities
- HM Treasury: Regulatory regime for cryptoassets (regulated activities) — Draft SI and Policy Note, updated 16 December 2025: HM Treasury: regulatory regime for cryptoassets
- FCA: Cryptoasset firms marketing to UK consumers, updated 6 February 2026: FCA: cryptoasset firms marketing to UK consumers