You don’t always get what you want! Mick Jagger’s statement could also apply to HMRC!

Graham Caddock, 14 January 2026

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A HMRC tax investigation can feel intrusive and open-ended, especially where requests for information escalate quickly. However, HMRC’s powers are not unlimited, and taxpayers have clear statutory rights. Understanding those rights early can help control the scope, cost and impact of an enquiry.

When can HMRC open a tax enquiry?

HMRC have the legal right to open a tax enquiry but must normally do so within 12 months of a return being submitted. That enquiry can be into an individual, business or company but can also encompass their related VAT returns. In certain circumstances, HMRC can even “look-back” and open a tax investigation into the previous up to 20 years! This typically applies where HMRC suspects deliberate behaviour or significant errors.

How does a HMRC compliance check start?

A HMRC investigation (or compliance check as they call it) normally starts with a letter or phone call asking for further information, records, explanations or even a meeting. These initial overtures are looking for voluntarily compliance, but HMRC can use their statutory information powers if they feel that the information is reasonably required to check that the correct tax has been paid. By correct, that can refer to past, present or future tax liabilities!

HMRC frequently gets the information it wants just by asking and without resorting to its formal powers. However, care should be taken not to provide too much information or non-relevant details which could widen the scope of an enquiry.

Your rights during a HMRC tax investigation

It should also be remembered a taxpayer has their own statutory rights to defend themselves against a HMRC “fishing expedition”. Before volunteering information or documents, a taxpayer should consider the following:

  • Is the information reasonably required to check the specific tax position?
  • Are the requests proportionate?
  • Is there a clear purpose for the request?
  • Has the information already been supplied?
  • Are the documents more than 6 years old (there are limits)?
  • Are any documents covered by legal professional privilege?
  • Personal or health records should not be handed over

Understanding these boundaries can materially affect the outcome of a HMRC tax investigation.

Statutory information notices and penalties

If a statutory request is issued by HMRC, there can be penalties of up to £3,000 for serious non-compliance. Although there is a right of appeal against a formal information request, tax-payers and advisors should check the validity of any information notice to ensure that it is reasonably required. It’s always possible to engage with HMRC to narrow the scope of the request, however early engagement with the officer will be required.

How can we help

Facing a HMRC tax enquiry or investigation can be stressful, time-consuming and financially risky. Early, specialist advice can make a significant difference.

We support individuals and businesses with:

  • HMRC tax investigations and compliance checks
  • Negotiating and limiting information requests
  • Protecting taxpayer rights
  • Managing penalties and dispute resolution
  • Strategic engagement with HMRC officers

For a confidential conversation about a HMRC tax investigation or enquiry, please contact our Tax Investigations Director, Graham Caddock, at grahamcaddock@lubbockfine.co.uk.