How to prepare for an HMRC tax investigation: A comprehensive guide
Date
March 27, 2025Author
Affinity Associates
Tax investigations by HMRC can be a daunting prospect for any business. Whether you’re a small business owner or manage a larger enterprise, the thought of an HMRC tax investigation can evoke stress and uncertainty. However, with proper preparation and understanding of the process, you can navigate an HMRC tax investigation with confidence. This post will walk you through the process of getting ready for an HMRC tax investigation.
What is an HMRC tax investigation?
What triggers an HMRC tax investigation?
There are a number of reasons why HMRC may select your business for a tax investigation. Some of the most common reasons include:
- Suspicious director salaries – Unusually high or low salaries can raise eyebrows and prompt further investigation.
- Inconsistent tax returns – Significant fluctuations in reported income, especially unexplained drops, will likely trigger an audit.
- Discrepancies from industry benchmarks – If your business’s financial figures deviate significantly from the norm for your industry, HMRC may investigate.
- Underreporting income – Failing to declare all income sources is a serious offence and a common trigger for investigation.
- Large, one-off VAT claims – Substantial VAT refunds, particularly if they seem out of line with your business activity, can lead to scrutiny.
- High turnover, low tax payments – A business generating significant revenue but paying minimal tax is a major red flag.
- Persistent late filing of tax returns – Regularly missing deadlines is a strong indicator of potential issues.
Occasionally, you can be selected at random, so just because you are the subject of an investigation doesn’t automatically mean there is something amiss with your finances.
Steps to prepare for an HMRC tax investigation
Step 1: Organise your financial records
The cornerstone of any HMRC tax investigation is your financial records. HMRC will expect you to provide accurate, complete, and up-to-date records. Here’s how to ensure your records are in order:
Maintain accurate bookkeeping
It is important to keep accurate and up-to-date records of your business’s financial transactions. This will make it easier for you to provide HMRC with the information they need during an investigation.
1. Keep all relevant documents
HMRC may request various documents during a tax investigation, including:
- Invoices and receipts
- Bank statements
- Payroll records
- VAT records (if applicable)
- Expense claims
- Tax returns
2. Reconcile your accounts
Double-check your financial records to ensure that they match your bank statements. This practice helps identify and rectify discrepancies before they become issues during an HMRC tax investigation.
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Step 2: Understand your tax obligations
A thorough understanding of your tax obligations is crucial for compliance. Familiarise yourself with the taxes relevant to your business, such as:
- Corporation tax: For limited companies
- Income tax: For sole traders, partnerships, and limited company directors
- VAT: If your business turnover exceeds the VAT threshold
- PAYE: If you have employees
Ensure that you’re aware of the deadlines for filing tax returns and making payments. Late filings or payments can trigger an HMRC investigation.
Step 3: Conduct a Self Assessment
Before an HMRC tax investigation, it’s wise to conduct a self-assessment of your financial records. This preemptive measure allows you to uncover and rectify any potential issues before they come to HMRC’s attention. Here’s how to go about it:
1. Review your tax returns
Go through your recent tax returns to ensure they’re accurate and complete. Check for any discrepancies or omissions that could raise red flags.
2. Identify potential risk areas
Certain areas are more likely to attract HMRC’s attention, such as:
Expense claims: Ensure that all expense claims are legitimate and supported by receipts.
VAT returns: Verify that your VAT returns are accurate and that you’re claiming the correct amount of VAT.
Payroll: Maintain accurate payroll records and adhere to PAYE rules.
3. Seek professional advice
If you’re uncertain about anything in your tax returns or financial records, consider seeking advice from a qualified accountant or tax advisor. They can help you spot and rectify any errors before they lead to an investigation.
Step 4: Prepare for the investigation
Once you’ve organised your records and conducted a Self Assessment, it’s time to prepare for the investigation. Here’s what to expect and how to prepare:
1. Notification of investigation
HMRC will typically notify you in advance of an investigation, either by phone or in writing. The notification will outline the scope of the investigation and the documents they wish to review.
2. Gather required documents
Gathering all the required documents ready in advance will help the investigation process go smoothly.
3. Designate a point of contact
Designate a knowledgeable point of contact within your business who will liaise with HMRC during the investigation. This person should be familiar with your financial records and tax affairs.
4. Prepare your team
If the investigation involves interviews with staff, ensure that your team is prepared. Provide them with an overview of what to expect and how to respond to HMRC’s questions.
Step 5: During the investigation
The day of the investigation can be stressful, but being well-prepared will help you navigate it with confidence. Here’s what to keep in mind during the investigation:
Be cooperative
Cooperate fully with HMRC during the investigation. Provide all requested documents and answer questions honestly and accurately. Try to stay calm and professional during an investigation. Remember that HMRC’s goal is to ensure compliance, not to catch you out.
Take notes
Take notes during the investigation, especially if HMRC identifies any issues or requests additional information. These notes will be useful for addressing any concerns after the investigation.
Step 6: After the investigation
Once the investigation is complete, there are a few key steps to take:
1. Review HMRC’s findings
HMRC will provide you with a report outlining their findings. Review this report carefully to understand any issues they’ve identified.
2. Address any issues
If HMRC has identified any discrepancies or issues, take prompt action to address them. This may involve amending your tax returns, paying additional tax, or providing further documentation.
3. Seek professional advice if needed
If you’re unsure how to address any issues identified by HMRC, seek advice from a qualified accountant or tax advisor. They can help you navigate the process and ensure compliance.
4. Implement changes to prevent future issues
Learn from the investigation and strengthen your financial management processes. Implement changes in place to prevent similar issues from happening again.
Conclusion
An HMRC tax investigation may seem intimidating, but with the proper preparation, it can be handled effectively. By organising your financial records, understanding your tax obligations, conducting a self-assessment, and preparing for the investigation, you can navigate the process with confidence. Remember, the goal of an HMRC investigation is to ensure compliance and not penalise businesses unnecessarily. A proactive and cooperative approach demonstrates your commitment to compliance, minimising the potential for penalties.
If you are a small business and want to save on tax, then contact Affinity Associates today for more best tax saving tips.
You can also call us at +44 20 8903 2077.