A UK customs audit can happen to any business that regularly imports or exports goods, and being unprepared can turn a routine check into a stressful, drawn-out process. HMRC uses these audits to verify that you’ve correctly declared duty and VAT and that your record-keeping meets the required standard. Our AEO-accredited customs team can help ensure your paperwork is in order well before HMRC comes calling.
What Is a UK Customs Audit?
A customs audit is a review HMRC carries out to check that a business’s import and export declarations, and the duty and VAT paid on them, are accurate and properly supported by records. It’s separate from routine border checks and typically involves HMRC examining a sample of past declarations alongside the underlying commercial documentation.
Audits can cover a specific period, a particular type of goods, or your customs processes more broadly, depending on what has prompted the review.
What Triggers a Customs Audit?
Customs audits can be triggered by a number of factors, including:
- Routine, risk-based selection as part of HMRC’s normal compliance activity
- Inconsistencies spotted between declarations and other data HMRC holds
- A pattern of amended or corrected declarations over time
- Holding certain authorisations or reliefs, such as customs warehousing or duty deferment, which come with ongoing compliance obligations
- A previous audit that identified issues requiring a follow-up review
Being selected for an audit isn’t necessarily a sign that anything has gone wrong, but it does mean your records need to hold up to scrutiny.
What Records Do You Need to Keep for a Customs Audit?
HMRC expects businesses to retain records supporting their customs declarations for several years. This typically includes:
- Commercial invoices and purchase orders
- Packing lists and transport documentation
- Evidence supporting the customs value declared
- Documentation supporting any preferential origin claims
- Records of duty and VAT paid, including any postponed VAT accounting entries
Missing or incomplete records are one of the most common issues that turn a routine audit into a longer, more difficult process.
How Can You Prepare in Advance?
The best preparation happens long before an audit is ever triggered. Practical steps include:
- Keeping declaration records and supporting documents organised and easily retrievable, not scattered across different systems or people
- Periodically reviewing a sample of your own declarations for accuracy, rather than waiting for HMRC to find issues
- Making sure commodity codes and customs valuations are reviewed regularly, particularly if your product range changes
- Working with a customs agent who keeps accurate records on your behalf and can support you if a query arises
What Happens During an Audit?
HMRC will typically request access to specific records and declarations, and may ask questions about your customs processes and how decisions, such as commodity code classification, were made. If discrepancies are found, this can lead to a demand for additional duty or VAT, and in some cases, penalties, depending on the nature and cause of the error.
Having a customs agent who prepared or reviewed the original declarations can make this process much smoother, since they can explain how the figures were calculated.
Which Ports Does This Apply To?
A customs audit isn’t tied to a specific port, since HMRC reviews declarations regardless of where goods entered the UK. MartinTrux supports clients with customs compliance across ports including Southampton and Portsmouth.
Frequently Asked Questions
How far back can HMRC go in a customs audit?
HMRC can typically review records going back several years, so it’s important to retain customs documentation longer than you might expect.
Does being AEO-accredited reduce the chance of an audit?
AEO accreditation reflects a business’s compliance standards and is generally associated with lower risk scoring, though it doesn’t eliminate the possibility of an audit.
What should I do if I find an error while preparing for an audit?
It’s generally best to proactively disclose any errors you identify rather than waiting for HMRC to find them, as this is usually viewed more favourably. A customs specialist can advise on the right way to do this.
How MartinTrux Can Help
MartinTrux has supported UK importers and exporters with customs compliance since 1982, with over 500 years of combined team experience across our Dover, Heathrow, and Manchester offices. We are accredited by HMRC as an Authorised Economic Operator (AEO), and our processes and systems are regularly audited, so we understand what good record-keeping looks like from both sides.
This article is intended as general guidance and not formal legal or customs advice. If you’d like help reviewing your records ahead of a potential audit, get in touch with our team, and we will help.