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Accountancy practices

AML obligations for external accountants, auditors, insolvency practitioners and tax advisers, with reporting and supervision explained.

Independent regulatory guidanceSources reviewed: 16 October 2026UK jurisdiction
01 · Legal perimeter

Scope and supervision

Responsible supervisor

An eligible professional-body supervisor, or HMRC where the business is not supervised by a qualifying body. OPBAS oversees professional-body AML supervision.

Regulation 11 defines auditors, insolvency practitioners, external accountants and tax advisers. Tax-adviser scope includes material aid, assistance or advice concerning another person's tax affairs provided by way of business, directly or through third parties.

Determine whether bookkeeping, accounts preparation, tax assistance or related services bring the business into scope, and whether a relevant exemption applies. Internal work for an employer is not automatically the same as providing external accountancy services by way of business.

Professional membership alone does not establish that a practice is appropriately supervised for every service. HMRC registration is required where applicable if the business is not supervised by an eligible professional body. OPBAS supervises the professional-body supervisors, not every individual practice directly.

02 · Sector requirements

Rules specific to this sector

Apply the statutory definitions to the work actually performed. A business assisting with tax affairs can be covered even if its main title is not 'tax adviser'. Providing TCSP services may create additional scope and registration considerations under Regulation 12.

The CCAB accountancy guidance helps interpret the obligations for the sector, but is not a blanket safe harbour. Approved guidance can be relevant to supervisory and court consideration; it does not excuse conduct contrary to legislation.

Practical application

Record service scope, the responsible supervisor and any required registration. Use the current guidance edition and check statutory amendments.

HMRC accountancy service provider registration guidance (opens in a new tab)

03 · Regulatory framework

Core regulations explained

These duties apply where the business and activity fall within the relevant statutory scope. Sector-specific provisions, exceptions and proportionality conditions must be considered alongside each explanation.

Regulation 18 requires a relevant person to identify and assess its money-laundering and terrorist-financing risks. The assessment must consider customers, countries or geographical areas, products or services, transactions and delivery channels, as well as information made available by the supervisory authority. Its extent must be appropriate to the size and nature of the business.

Keep a written record and keep the assessment up to date unless the supervisor has determined that an individual documented assessment is unnecessary for the sector. Regulation 18A separately addresses proliferation-financing risk: the risk of breaches, non-implementation or evasion of financial sanctions connected with proliferation of weapons of mass destruction.

Practical application

Record the evidence behind each risk rating, the controls used to reduce the risk and the remaining exposure. Reconsider the assessment when the business model, customer base or relevant threats change.

MLR 2017, Regulations 18–18A (opens in a new tab)

Typology hotspots

Recurring risk indicators

  • Complex or offshore corporate structures
  • Tax-abusive arrangements and R&D relief fraud
  • Insolvency instructions with suspected pre-pack asset transfers
  • Introduced business without evidenced source of instruction
  • Non-face-to-face onboarding without compensating controls
How we help

Advisory support for the sector

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