Insight

HMRC Audit Triggers: What Gets Your Business Flagged?

Written by: Shaun Hall | 13/04/2026 | Read time: 5 minutes
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Increasing data analytics

HM Revenue and Customs (HMRC) is increasing its use of data analytics to identify customs non-compliance. With compliance yield now at record levels, businesses are no longer selected for audit at random. They are being targeted based on risk indicators.

Understanding what triggers an audit is critical to reducing exposure.

  • HMRC uses a combination of CDS declaration data, import and export trends, industry benchmarking, and historical compliance behaviour to identify inconsistencies and anomalies across large datasets.
  • One of the most common triggers is inconsistent commodity codes. If similar goods are declared under different classifications, this raises immediate concern. This often includes the same product being declared under multiple codes, the use of generic or catch-all codes, or classification changes without clear justification.
  • Unusual valuation patterns are another key trigger. HMRC closely reviews declared values against expected benchmarks. Common issues include values that appear too low, missing elements such as freight or insurance, and inconsistent pricing across shipments. Intercompany transactions are particularly scrutinised in this area.
  • Incorrect use of preferential origin is also a major risk. Claiming reduced or zero duty without the appropriate supporting evidence will almost always result in challenge. This includes missing supplier declarations, incorrect application of rules of origin, or an inability to provide documentation during an audit.
  • Sudden changes in import behaviour can also attract attention. Significant shifts in import volumes, sourcing countries, or duty profiles may indicate underlying compliance issues and prompt HMRC to review activity more closely.
  • The use of duty reliefs and special procedures is another area of focus. Frequent use of regimes such as inward processing, customs warehousing, or returned goods relief without robust audit trails increases the likelihood of review.
  • HMRC also increasingly challenges businesses that rely entirely on customs brokers without maintaining internal oversight. Importers are legally responsible for their declarations, regardless of whether an agent is used. A lack of internal controls is often viewed as a compliance weakness. 

If a business is flagged, HMRC may request supporting documentation covering classification, origin, and valuation. This can lead to a desk-based review or a full audit. HMRC typically reviews up to three or four years of historical declarations and may issue duty reassessments and financial penalties where errors are identified.

To reduce risk, businesses should standardise their commodity code classifications, validate valuation methodologies (particularly for intercompany transactions), and ensure robust origin evidence is maintained. Regular review of CDS data to identify inconsistencies is critical, alongside implementing a structured customs compliance framework.

HMRC audits are no longer reactive. They are data-driven and targeted. If your data tells the wrong story, your business becomes the next audit. 

If you are concerned about your audit exposure, Frontiera can support with a structured customs audit risk review to identify issues before HMRC does.

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