HMRC is increasing tax investigations

Newsletter issue – March 2026

HMRC is intensifying checks on individuals and small businesses. Many investigations begin because of avoidable mistakes that trigger automated red flags. Here are six common mistakes that can trigger an HMRC investigation:

1. Living beyond your declared means-if your lifestyle (cars, holidays, property) doesn't match your reported income, HMRC's data-matching systems may flag you. They compare bank data, land registry records, and even social media activity.
2. Running a cash-heavy business-businesses like restaurants, salons, and trades are considered higher risk. Poor record-keeping or unbanked cash can raise suspicion.
3. Late or incorrect tax filings-missing deadlines or frequently amending returns suggests disorganisation or possible avoidance.Repeated issues put you firmly on HMRC's radar.
4. Mixing personal and business finances-sole traders often fall into this trap. It makes audits harder and can look suspicious. A separate business bank account is strongly recommended.
5. Unrealistic or excessive expense claims-HMRC algorithms flag unusually high expenses, especially for travel, meals, or home-office use. Claims must be wholly and exclusively for business.
6. Sudden or unexplained changes in income-sharp drops in turnover or profit without a clear reason can prompt scrutiny. HMRC expects documented explanations (e.g. losing a major client).

Good record-keeping and accurate reporting are essential. If you are unsure, please get in touch to discuss your situation to avoid unnecessary stress and costs.