HMRC anti-avoidance privilege rules start 19 June 2026

A new HMRC statutory instrument comes into force on 19 June 2026, and it answers a very specific but important question: what happens when HMRC asks for information in an anti-avoidance case and the recipient says some of that material is legally privileged? In the text you shared, the answer is a timed dispute process that ends either in written agreement or in a tribunal ruling. The instrument was signed on 27 May 2026 by HMRC Commissioners Jonathan Athow and Myrtle Lloyd, laid before the House of Commons on 29 May, and is due to take effect on 19 June. That may sound narrow, but it goes to a bigger issue you will see again and again in public life: when the state wants information, who decides what it may not have? The wider anti-avoidance information notice system sits in the Finance Act 2026, and HMRC said in its November 2025 policy paper that these notices were meant to help it investigate promoter organisations and identify the people behind them. (legislation.gov.uk)

If you are new to delegated legislation, this is a useful example to keep. Parliament passed the main framework in the Finance Act 2026. Section 186 says some material is 'excepted information', including material protected by legal professional privilege, and then gives HMRC Commissioners power to make separate regulations for sorting out disputes about that privilege. (legislation.gov.uk) **What this means:** the big rule is in the Act, but the day-to-day procedure sits in a later statutory instrument. The Act also says these regulations are made by statutory instrument and can be annulled by a resolution of the House of Commons. In Westminster terms, that points to the negative procedure. That last label is an inference from the Act’s wording. (legislation.gov.uk)

Legal professional privilege can sound forbidding, but the basic idea is simple enough. It protects certain confidential communications between a client and a professional legal adviser, so the government cannot simply force them into the open. In this part of the Finance Act 2026, privileged information appears alongside personal records and journalistic material in the list of material an anti-avoidance information notice does not require a person to provide. (legislation.gov.uk) That safeguard matters because HMRC’s anti-avoidance notice powers are part of a wider push against marketed tax avoidance. GOV.UK’s November 2025 policy paper says the package was aimed at promoters and enablers of tax avoidance, not at wiping away legal protections. So these new regulations are best understood as a way to test privilege claims, not a way to ignore them. (gov.uk)

In the regulations you shared, the clock starts with the recipient of the information notice. If HMRC and the recipient disagree about whether material is privileged, the recipient must send HMRC a list of the disputed material by the deadline in the notice, or by a later date HMRC agrees, so long as that later date falls within 20 working days after the original deadline. The list should describe the material and its contents, unless giving that description would itself reveal privileged information. HMRC must then say which items on that list it thinks are not privileged. If there is still a live disagreement, the recipient must apply to the tribunal within 20 working days of HMRC’s notification and include copies of the material still in dispute. Until that argument is settled, the recipient is treated as having complied with the notice in relation to the disputed material.

The tribunal’s role here is deliberately narrow, and that is worth noticing. It is not there to rerun the whole tax dispute. It is there to decide whether, and to what extent, the disputed material is privileged. The regulations also leave room for HMRC and the recipient to settle the point by written agreement at any stage, which means not every dispute has to end in a formal decision. **What it means for you:** process can be a protection in its own right. The regulations define a working day by excluding weekends and bank holidays anywhere in the UK, and they also make clear that a representative may act for the recipient. That is the law taking a vague row about confidentiality and turning it into a timetable with checkpoints.

HMRC did not produce these rules in a vacuum. Its November 2025 policy paper on tackling promoters of marketed tax avoidance said anti-avoidance information notices were designed to help HMRC investigate promoter organisations, identify responsible individuals, and support enforcement with civil penalties and, in more serious cases, criminal sanctions for non-compliance. The Finance Act 2026 then put those notice powers and penalty rules into law. (gov.uk) Seen in that light, these privilege-dispute regulations are the balancing piece. HMRC gets a route to challenge claims it thinks go too far, while the recipient gets a defined route to put the question before an independent tribunal. That is why a small procedural instrument can matter just as much as a louder headline announcement. (legislation.gov.uk)

It is easy to skim a statutory instrument like this and assume it is only for tax specialists. But it is also a neat civics lesson. You can see Parliament making the broad rule in the Finance Act, HMRC Commissioners filling in the practical steps through delegated legislation, and the tribunal acting as referee when state power meets legal confidentiality. (legislation.gov.uk) So the main takeaway is straightforward. From 19 June 2026, there is a formal path for disputes over privilege under HMRC’s anti-avoidance information notice regime. If you want to understand how law works in real life, this is a strong example: not only who has power, but how that power is checked, timed and argued over.