HMRC Mandatory Registration for Tax Advisers: MMTAR Deadline 18 August 2026
What Happened
HM Revenue & Customs (HMRC) has opened mandatory registration for tax advisers under the Money Laundering, Terrorist Financing and Transfer of Funds (Information on the Payer) Regulations (MMTAR). The first deadline for new tax advisers is 18 August 2026. Registration is free and conducted online via HMRC's new digital system, replacing previous processes. The government is investing £36 million to modernize tax adviser registration.
Why It Matters
Failure to register under MMTAR may result in restrictions on interacting with HMRC on behalf of clients, as well as potential financial penalties. The phased rollout extends to early 2027 for existing ASA holders and financial services firms. This is part of a broader effort by HMRC to strengthen UK AML compliance among tax advisers and align with international standards.
In parallel, HMRC has opened consultations on two related areas: extending powers to recover lower-value tax debts through direct deductions (consultation until 28 August 2026) and modernizing information and inspection powers under Schedule 36 of the Finance Act 2008 (consultation until 7 September 2026). These reforms signal a significant tightening of the UK's tax compliance environment.
What Organizations Should Do
Tax advisers should take the following steps to ensure compliance with the tax adviser registration deadline:
- Verify eligibility – Confirm whether your activities fall under the MMTAR scope (e.g., tax advice, accounting services).
- Gather required information – Prepare individual and firm details, including registration numbers, contact information, and professional qualifications.
- Register via HMRC's online service – Complete the free registration before the 18 August 2026 deadline.
- Maintain ongoing compliance – Implement AML policies, conduct risk assessments, maintain records, and ensure staff training.
Related Resources
For ongoing AML compliance monitoring, consider using AIGovHub's CCM Module, which offers continuous compliance monitoring, automated rule engines, and ERP integration to help firms stay ahead of regulatory obligations.
This content is for informational purposes only and does not constitute legal advice.