Could HM Revenue & Customs (HMRC) investigate you even if you've submitted your tax return correctly?
Yes!
It's probably something most individuals and business owners don't realise till it's too late.
HMRC can open an enquiry into your tax affairs for a variety of reasons. Sometimes it's because something may not look right. On other occasions it's due to information that doesn't match. And there are other times where it's because your return has been selected for further review.
So, that doesn't necessarily mean you've done anything wrong. But it does mean you'll need to respond. For that reason, we've written this guide to help explain:
The short answer is yes!
A significant misconception we come across is that clients think HMRC only investigates people and businesses they believe have intentionally done something wrong. That's just not the case.
Whether you're:
HMRC has the power to open an investigation into anyone and look into your tax affairs. Sometimes there will be a clear reason. On other occasions it'll be because information doesn't match records held elsewhere.
The important point is that receiving a letter from HMRC doesn't mean you've done anything wrong.
You will however need to respond, provide relevant information, and likely spend time dealing with them as they conduct their enquiry.
The role of HMRC is to administer the tax system and make sure that the correct amount of tax is collected from people and organisations.
To do this, it uses sophisticated technology to compare data and information from a range of sources which include tax returns, payroll records, banks, employers, Companies House and other third parties.
From this an enquiry could come about because:
Just remember that an investigation isn't necessarily an accusation.
Quite often HMRC is asking these questions so that they can better understand your circumstances.
No, and this is probably the most important takeaway for you.
Often many investigations uncover little more than an innocent mistake, or a misunderstanding which can be understandable given how complex the UK tax system is. Especially if you're doing it yourself.
On many occasions these investigations also confirm that everything has been reported correctly in our experience. The point is some enquiries are opened without HMRC suggesting there's been any wrongdoing. You can be selected randomly.
However, responding properly is absolutely essential. This means you'll have to supply records, answer questions, and explain how some figures were calculated. It's essential to have organised records and professional support to make this process far less stressful.
The key is not to panic in such circumstances, but be prepared if HMRC contacts you.
Often the tax bill isn't the biggest expense. Many business owners and individuals don't realise that dealing with, and responding to HMRC requires considerable professional time. Remember that professionals often operate on some form of hourly rate.
Depending on the complexity of an investigation, your accountant may need to:
Some enquiries are resolved quickly but others can last for many months.
This means as the work involved increases, so too do the professional fees, and sometimes that can run into several thousand pounds depending on the complexity of the case.
Unfortunately that's often the cost many people don't anticipate.
You can't prevent HMRC from opening an enquiry, but you can prepare for the possibility.
One way of doing this is that at our firm, many of our clients choose to take advantage of our Tax Investigation Service.
This doesn't prevent an investigation from happening. Instead it's there to help cover the professional fees associated with dealing with an HMRC enquiry should one take place.
If, as a client, HMRC contacts you then our experienced advisors can help manage the process on your behalf (subject to certain limits and conditions) without you having to worry about the professional costs for representing you accumulating along the way.
This can provide reassurance whilst also allowing you to focus on your business whilst we deal with these matters.
Tax investigations can impact a wide range of taxpayers, not just large businesses.
It may be wise to consider tax investigation services if you're:
The danger is many people assume it will never happen to them. Remember, HMRC enquiries aren't limited to businesses with complex affairs, or those who have avoided tax.
So whilst good record keeping is essential, keep in mind that it doesn't remove the possibility of an enquiry.
Most people don't expect to receive a letter from HMRC. If one does arrive, their first thoughts are often:
These are understandable questions and they can lead to feelings of angst.
This is why many of our clients choose our Tax Investigation Service. It not only helps cover the professional fees of dealing with an HMRC enquiry, but also ensures an experienced advisor manages the process on your behalf. That way you're likely to be far less distracted by it and can continue to focus on your business or personal affairs.
Ultimately, it's about peace of mind. Hopefully you'll never need to use it. But if HMRC does get in touch, you'll know experienced professionals are there to guide you through the process.
You have to decide if tax investigation services are appropriate to your circumstances.
Many people choose them for the same reason they seek professional tax advice, they value certainty if something ever did go awry. Remember, if HMRC ever opens an enquiry, you'll still need to respond, provide information, and deal with the full process.
Choosing tax investigation services and having experienced professionals handle those discussions on your behalf means you can save considerable potential time, stress, and hassle, while feeling reassured throughout the duration of an enquiry.
The hope is you'll never need to use the service.
But as with many of our clients, you may value the peace of mind from knowing it's there should the unexpected ever happen.
1. Don't ignore the letter
2. Respond within the timelines provided
3. Gather all relevant records
4. Don't guess at all if you're unsure of any answers
5. Consult an accountant as soon as possible
Why do tax investigations occur?
HMRC is attempting to bridge something referred to as the 'tax gap'. This is the difference between the amount of tax the UK actually collects compared to the tax that it could gather. Investigations are a way of ensuring compliance and improving the tax take (how much comes in) so that there's sufficient revenue going to the Treasury to fund public services.
Yes, HMRC investigate individuals, sole traders, landlords, partnerships, company directors, and limited companies. Just remember that an enquiry doesn't mean you've done anything wrong necessarily. Sometimes investigations are opened as part of HMRC's compliance checks or to clarify information from a tax return.
Unfortunately there's no clear answer to this. It all depends on the complexity of the enquiry. Some investigations can be resolved in weeks, others can take several months, and in some cases even over a year. As a general rule, the more information HMRC requests, the longer the process is likely to take.
This depends on your circumstances. In more straightforward cases HMRC will look back up to 4 years. If it believes tax has been lost from particularly careless behaviour or with deliberate intent, then it has the powers to look back much further, potentially up to 20 years.
Typically HMRC will request records that support the figures that were filed in your tax return. This can include:
Yes, HMRC enquiries aren't always accusations of wrongdoing. They can arise because information needs to be checked and clarified, if figures appear unusual, or through random selection.
No, that's not the case. Tax investigation services are relevant, depending on their circumstances, to individuals who complete Self Assessment tax returns, landlords, sole traders, and company directors.
You mustn't ignore the correspondence. Read the letter carefully, respond within any deadlines it states, and be sure to talk to your accountant immediately. Remember professionals are used to dealing with such matters on behalf of their clients which means they should ensure the enquiry is handled correctly, efficiently, and effectively.
Whilst you can't guarantee HMRC won't open an enquiry, doing the following is generally good housekeeping when it comes to matters oftaxation and potential enquiries:
If you're not sure if your tax return is correct, seek professional advice. Doing so is likely far preferable to not knowing.
This post was created on 10/10/2019 and updated on 22/07/2026.
Please be aware that information provided by this blog is subject to regular legal and regulatory change. We recommend that you do not take any information held within our website or guides (eBooks) as a definitive guide to the law on the relevant matter being discussed. We suggest your course of action should be to seek legal or professional advice where necessary rather than relying on the content supplied by the author(s) of this blog.