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How far back can HMRC investigate?

Home → Tax Investigations → Tax Investigation FAQs → How far back can HMRC investigate?

HMRC will investigate further back the more serious they think a case could be. If they suspect deliberate tax evasion, they can investigate as far back as 20 years. More commonly, investigations into careless tax returns can go back 6 years and investigations into innocent errors can go back up to 4 years.

An investigation will often start with an enquiry into the last year’s tax return. During their investigation into your most recent documents, HMRC will attempt to determine if:

  • There have been no mistakes, in which case they can close the investigation;
  • The mistake was due to an innocent error, in which case they may go back 4 years;
  • The mistake was due to your negligence, in which case they may go back 6 years;
  • The mistake was a deliberate attempt to avoid paying tax, in which case they may go back 20 years.

At any stage in the investigation, HMRC may change its stance on the reason for any mistakes or omissions. For example, if it initially believes that a mistake was a one-off, innocent error but then finds grounds to suspect ongoing negligence, the investigation will be extended to look further back resulting in HMRC requesting more information.

HMRC can also start investigations into an individual’s finances upon information it receives from sources other than the tax return, such as Land Registry information or overseas banking details which can trigger an enquiry. These investigations can go back a similar length of time.

Of course, the further back the HMRC wishes to look, the more stressful and difficult a tax investigation can be for many people. The amount of information and detail requested by HMRC can be overwhelming so it is important to obtain specialist advice at an early stage to ensure you make the right decisions, including challenging HMRC if it is appropriate to do so.

Regardless of what stage of a tax investigation you are at, if you haven’t spoken to a lawyer yet we recommend you doing so. Call our tax investigation team today for a confidential initial telephone conversation, completely free and with no obligation for the future.

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