What Should You Do If HMRC Conducts a Surprise Audit?
- TBA
- 2 days ago
- 6 min read
Whether engaging in commercial trade or simply working and living in the UK, you may encounter an audit by HM Revenue and Customs (HMRC), because tax inspections often happen routinely.
Even if you declare and pay taxes on time, you may still be subject to a 'surprise’ inspection by the tax authorities, or need to comply with routine document or information requests.
Today, we’ll share three typical cases we’ve helped our clients handle, along with the correct ways to respond.
Case 1: Purchasing agent VAT refund
Client A is a sole trader focusing on cross-border purchasing. Due to large purchase amounts, the VAT paid monthly amounted to thousands of pounds. After gaining a detailed understanding of Client A’s business model—including purchasing channels, sales destinations, annual purchase volume, and whether imports to the UK were involved—we then helped them reduce costs by applying for the appropriate VAT refunds.
When applying for the refunds, we assisted Client A in preparing detailed application evidence and materials, clearly stating the export purpose of the goods, all eligible purchase invoices, and export customs vouchers.
Ultimately, we successfully helped Client A obtain the VAT refund.
Case 2: Multiple HMRC audits, all resulting in successful refunds
Client B is a seller operating a cross-border e-commerce shop and encountered multiple HMRC audits.
The first instance was due to a large refund request amount, which attracted the attention of the tax authorities and led to an HMRC review.
After receiving Client B’s request for help, we immediately collected all of the client’s receipts and information for the claimed deductions. Then, based on VAT deduction rules, we explained to the tax office in detail how each refund amount was calculated. HMRC eventually certified that the declaration was correct, and the client successfully received the refund.
Due to the previous audit history, Client B was audited again after amending a declaration amount. This investigation lasted for three years (HMRC required a review of the seller’s tax returns, income, and expenditure invoices for the past three years). Similarly, after we organised all materials and provided detailed calculations and explanations to the tax office, we once again helped the client receive a high-value refund.
Note that HMRC audits are also recorded by customs.
Client B had previously been reviewed by HMRC during a customs declaration because customs believed the price was higher than the declared value during clearance. Once it is determined that the declared value is too low, they will require the amount to be increased. In this scenario, the VAT payment amount will also increase.
Finally, this was successfully resolved under our handling.
Case 3: Personal income tax overpayment refund
Client C worked in the UK for a period covering two tax years. After finishing work and moving to China, they filled out a P800, which is a tax calculation or tax review form, and received an email from HMRC stating that overpaid tax could be refunded (approx. £20,000). However, as their mailing address was in China, they had not received the refund cheque for a long time. Therefore, the client contacted us for assistance.
After understanding the specific situation, we immediately applied for authorisation and handled the matter on their behalf. For clients whose address is not in the UK, we can sometimes act as an agent to receive cheques and forward them.
Ultimately, we contacted HMRC and completed the address change on the second day after receiving the client’s request, and received the refund cheque to post back to the client three working weeks later, successfully securing the £20,000.
TB Accountants tips
UK HMRC can trigger audits for various reasons. Common types of checks involve:
Corporation Tax
VAT
Self-Assessment Tax Returns
For sellers operating cross-border e-commerce in the UK, if you have non-compliant declarations, tax arrears, or long-term/large-amount refunds, you are extremely likely to be audited by the UK tax authorities.
Improper handling could face store closure or even huge fines. If your email inbox receives an email starting with CFSS followed by 7 digits, this indicates that you may be subject to a tax audit. You can contact us to handle this for you.
HMRC’s 'radar': which situations are easily targeted?
HMRC has entered the 'data-driven' era.
Its powerful ‘Connect’ data analysis system integrates dozens of data sources from banks, employers, property transactions, social media, and even online platforms.
When your tax return shows the following 'red flags', the risk of being audited rises significantly:
Data anomalies and mismatches
This is the most common and direct trigger.
For example, if the income in your Self-Assessment tax return does not match the information HMRC has obtained from your employer (via the PAYE system), banks (interest income), or e-commerce platforms (such as Amazon or eBay).
Suspicious elements in the tax return
Simple calculation errors can trigger doubts about the accuracy of the entire return.
Additionally, if the proportion of declared business expenses is too high, or includes a large amount of suspicious private consumption (such as excessive 'business entertainment' or car expenses that do not match the scale of the business), this can also alert HMRC.
If a business declares losses for many consecutive years, especially if the industry is generally profitable, HMRC will suspect whether you are counting personal living expenses as company costs, or whether you are truly operating with a view to profit.
Being in a high-risk industry or sector
HMRC concentrates resources on reviewing specific areas.
Traditional high-risk industries include sectors with active cash transactions such as construction, catering, and retail.
Under new regulations, online platforms must report seller income to HMRC. If you are active on e-commerce platforms like eBay but have not declared it, you are easily identified.
Additionally, HMRC has established a special anti-fraud team to conduct extremely strict reviews of R&D refund applications from SMEs, especially start-ups, and strictly controls the definition of 'qualifying R&D activities'.
For individuals using existing 'non-dom' rules for tax planning, HMRC will strengthen reviews, focusing on inheritance tax, capital gains tax, and overseas income.
Lifestyle disconnected from declared income
The Connect system can outline your life profile through public data.
For example, if your declared taxable income can only support a basic standard of living, but data shows you purchased expensive property, luxury cars, or went on frequent luxury trips. Life status shared on social media can become indirect evidence for investigation.
Having a poor record If you have a history of late filing, late payment, or under-reporting tax, you will be on HMRC’s 'watch list', and the probability of being checked again is higher.
Dealing with it calmly: a professional action guide after receiving an audit notice
Stay calm and inform your professional tax advisor immediately
Do not panic, and do not ignore it. HMRC letters have strict reply deadlines. Immediately forward the full text of the notice to your tax advisor or accountant.
Let the tax advisor lead communication
Tax advisors are proficient in tax law and communication skills, knowing how to respond precisely to HMRC’s requests to avoid expanding the scope of the investigation or falling into a disadvantageous position due to unprofessional wording.
Prepare and provide documents methodically
Your advisor will help you understand the scope of HMRC’s request and guide you in collecting the necessary supporting documents. Typical documents include: Bank statements, invoices, receipts, contracts, account books, payroll records, etc.
Understand the type of review and potential outcomes
Some reviews only target a specific issue (such as travel expenses). The scope is limited and usually easier to resolve. On the other hand, some reviews involve an in-depth review of all your tax affairs, which is more complex.
Of course, the best strategy for dealing with audits is to avoid being audited!
The following three points should be noted:
Accuracy and timeliness: Ensure all tax returns are accurate and submitted before the deadline.
Keep complete records: Retain all business records and documents as required by law. Clear, organised records are the most powerful weapon in dealing with reviews.
Seek professional advice: Establish a long-term partnership with a trusted tax advisor. Taking TB Accountants as an example, we can not only help you declare compliantly but also provide forward-looking tax planning to avoid risks from the source.
Why TB Accountants?
Professional Assurance: Our team includes ACA members and ACCA-certified professionals, delivering services to the highest industry standards.
Responsive Service: We respond to your inquiries within 24 hours, ensuring efficient communication across time zones.
Multilingual Support: Services available in English, Mandarin, Cantonese, Japanese, French, German, Spanish, Italian, Turkish, and more.
Trusted by Clients Worldwide: Consistently praised by global clients for proactive, professional, and reliable accounting and tax support.
For individuals and businesses looking for UK taxation services, use our contact form to get in touch for more information.
Get in touch with us at info@tbagroup.uk or for a free one-to-one consultation.
