HM Revenue & Customs (HMRC) is pressing tax professionals with a stark reminder: the deadline for registration under its revamped Mandatory Registration scheme is just one month away. From 18 August 2026, any new entrants to the profession or those lacking existing accounts must comply – with around 8,000 advisers still yet to register.
The Modernising and Mandating Tax Adviser Registration (MMTAR) system has been designed as a streamlined digital platform to replace outdated processes. Its purpose is to standardise interactions between tax experts and HMRC, ensuring high-quality advice for all taxpayers. Free registration can be completed online, with an interactive tool available on GOV.UK to aid advisers in determining their eligibility and necessary steps.
HMRC's Director of Intermediaries, Robert Jones, stresses the significance of compliance: "These measures are aimed at fostering a fairer and more transparent tax advice landscape. We're committed to supporting high-quality advisers who adhere to our standards – boosting public trust in professional advice." HMRC has invested £36 million into this modernisation project as part of its growth plan.
For households and businesses, the new registration scheme offers greater assurance when seeking tax guidance. By standardising registration processes and setting clear conditions for advisers, instances of poor or unregulated advice are expected to decrease – potentially leading to better financial planning and reduced unexpected tax liabilities.
Failure to comply by 18 August could have severe repercussions: non-registered advisers may face restrictions on HMRC interactions, causing delays or disruptions. In extreme cases, HMRC has warned that sanctions – including fines – may be imposed on uncooperative advisers, indirectly impacting businesses reliant on these professionals.