Introduction

Receiving a letter from HMRC informing you of a tax enquiry can be stressful for any individual or business. While many enquiries are selected at random, certain patterns and behaviours are more likely to attract HMRC’s attention. Understanding these common triggers can help reduce the risk of an investigation and ensure your tax affairs remain compliant.

1. Late Tax Returns

One of the most common reasons businesses attract HMRC’s attention is repeatedly filing tax returns after the deadline. Although a single late submission may not trigger an enquiry, persistent delays can indicate poor record-keeping or compliance issues.

How to avoid it: Keep a tax calendar and submit returns well before the deadline.

2. Incorrect VAT Returns

HMRC closely monitors VAT returns for unusual figures, frequent amendments and inconsistencies. Large VAT repayment claims or sudden changes in turnover can also prompt further checks.

How to avoid it: Ensure your bookkeeping is accurate and reconcile your VAT records before submission.

3. Large Fluctuations in Income or Profit

Significant increases or decreases in turnover, profits or expenses compared with previous years or businesses in the same industry may raise questions.

How to avoid it: Maintain clear records explaining any major changes, such as expansion, new contracts or economic conditions.

4. Cash-Intensive Businesses

Businesses such as restaurants, cafés, takeaways, taxis, salons and convenience stores often receive greater scrutiny because cash transactions can be more difficult to verify.

How to avoid it: Record every sale accurately and bank cash regularly to create a clear audit trail.

5. Excessive Business Expenses

Claiming unusually high travel, entertaining, home office or motor expenses compared with your income may trigger HMRC to request supporting evidence.

How to avoid it: Only claim expenses that are wholly and exclusively for business purposes and keep all receipts.

6. Lifestyle Doesn’t Match Declared Income

If someone declares a relatively modest income while purchasing expensive properties, luxury vehicles or other high-value assets, HMRC may question how those purchases were funded.

How to avoid it: Maintain documentation showing legitimate funding sources such as savings, inheritances, loans or investment income.

7. Errors or Inconsistencies on Tax Returns

Simple mistakes, missing information or figures that do not match data HMRC already holds (for example, PAYE or bank interest) can trigger further enquiries.

How to avoid it: Review all tax returns carefully before submission or have them checked by a qualified accountant.

8. Information from Third Parties

HMRC receives information from banks, Companies House, employers, overseas tax authorities, online platforms and other organisations. If these records do not match your tax return, HMRC may investigate further.

How to avoid it: Ensure your tax returns accurately reflect all taxable income and disclosures.

9. Industry-Specific Campaigns

HMRC regularly carries out compliance campaigns targeting sectors where errors or under-reporting have historically been more common, including construction, property, hospitality and online businesses.

How to avoid it: Stay up to date with HMRC guidance and seek professional advice if you are unsure about your obligations.

10. Random Compliance Checks

Not every HMRC enquiry is triggered by a problem. Some investigations are selected entirely at random to encourage compliance across the tax system.

How to avoid it: Keep complete and organised records throughout the year so you are always prepared if selected.

What Should You Do If HMRC Contacts You?

If you receive a letter from HMRC, don’t ignore it. Respond promptly, gather the requested information and seek professional advice if you are unsure how to proceed. Early engagement often leads to quicker and more efficient resolution.

How SKN Chartered Accountants Can Help

At SKN Chartered Accountants, we help businesses and individuals maintain accurate records, prepare compliant tax returns and deal with HMRC enquiries professionally. Whether you need assistance with Corporation Tax, VAT, Self Assessment or an ongoing HMRC investigation, our experienced team is here to support you.

Contact SKN Chartered Accountants today for expert advice and peace of mind.

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