April 2026 Deadline: All Tax Advisers Must Register with HMRC – Or Risk Being Locked Out

Mandatory registration for all UK tax advisers is coming into force from April 2026. This blog breaks down what it means, who’s affected, and what you need to do to stay compliant—and stay in business.

HMRCTAX ADVISORSMANDATORYREGISTRATION

The Tax Faculty

8/7/20252 min read

HMRC to Regulate the Regulators: Mandatory Tax Adviser Registration Incoming

Big changes are coming for accountants and tax advisers. From 1 April 2026, every professional interacting with HMRC on behalf of clients must be officially registered and meet minimum standards, under new legislation aimed at raising trust and cracking down on rogue operators.

The upcoming rules will apply to anyone providing tax advice as part of their business—whether you're filing returns, liaising with HMRC, or even just helping with documents that could impact a client’s tax position.

An online registration process will go live in 2026 (with a non-digital option for those who are digitally excluded), followed by a minimum 3-month transitional period. You'll need to submit:

Your name and address
Details of each senior manager
A declaration confirming you meet eligibility standards
Any additional information HMRC requires

While a few exceptions apply—such as advisers working solely on customs matters—the vast majority of professionals in practice will be caught by this rule.

📌 HMRC has committed to issuing guidance ahead of the deadline, so watch this space.

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Capital Gains Tax Expertise: The Tax Faculty LLP Managing Partner Charles Tateson Named UK Capital Gains Tax Advisor of the Year 2023

The Finance Monthly Taxation Awards recognises the achievements of tax professionals from around the globe.

Winning such an award is no small feat. It is a reflection of hard work, extensive knowledge, and an ability to navigate the intricacies of the UK tax system.

Read more about Charles and the award here.

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