Global Trade Live: Preparing for a customs audit

Data-Driven Audit Surge

The calendar alignment is deliberate. On 31 March 2026, just before April, HMRC switches on free self-service access to customs data via its new Trade Reporting and Extracting platform. Traders will see commodity codes, values, origins and duties paid in the same format auditors review daily.

This caps a post-Brexit evolution that began with phased controls and repeated delays. With the government quietly shelving its £110 million Single Trade Window project in February 2026 after years of spending, physical friction remains and data-led enforcement has become the main lever. Audits are no longer occasional; they are the default compliance tool.

Importers face the sharpest exposure. Every declaration must now be demonstrably accurate on duty and tax, often across fragmented global supply chains. Exporters to the EU encounter parallel demands under the bloc's full Carbon Border Adjustment Mechanism rollout in 2026. SMEs that have relied on agents for years are especially vulnerable when internal records prove incomplete.

The sums involved are concrete. Retrospective reviews routinely span three years; a consistent tariff misclassification on mid-volume lines can generate six-figure demands once interest and penalties are added. Withdrawal of authorisations such as inward processing relief or authorised economic operator status halts streamlined procedures and damages commercial relationships. Reputational contagion spreads quickly among logistics partners who avoid counterparties under HMRC scrutiny.

A subtler tension lies in the data itself. The same transparency that lets firms run pre-emptive health checks also equips HMRC with automated analytics to surface anomalies at scale. Companies that treat the TRE launch as routine housekeeping rather than a compliance diagnostic may find themselves flagged first. The parallel consultation on scrapping the £135 low-value import duty relief, closing 6 March 2026, signals yet heavier declaration loads ahead even if full implementation waits until 2029.