What is a customs audit checklist?
A customs audit checklist is a structured list of the records, evidence and controls an importer should be able to produce if HM Revenue & Customs (HMRC) reviews its declarations after clearance. A useful checklist covers six areas: preference evidence, tariff classification, customs valuation, special procedures, declaration data quality and agent oversight.
HMRC's systems process around 4.4 million declaration lines a day, and audits are selected by risk profiling — not at random. When officers review an importer, they are testing one thing: whether your declarations are supported. The right commodity code, a customs value that reconciles, a valid proof of origin behind every preferential rate, procedures operated within their authorisations, and records that match your commercial reality.
The window matters. HMRC can generally issue a post-clearance demand up to three years after the original declaration — and considerably further where errors were deliberate — while import records should be kept for at least four years. The same three-year period works in your favour too: duty you have overpaid is generally reclaimable for up to three years from entry. For the full picture of how that window operates, see the post-clearance audit guide.
Work through the six sections below honestly. Every item you cannot tick — and every "not sure" — is exactly where an auditor would start.
The UK customs compliance checklist.
Six risk dimensions, twenty-eight checkable items. Each one is a question an HMRC officer can ask — and expect an evidenced answer to.
Preference evidence
Preferential duty rates are only as strong as the origin evidence behind them — and missing proofs are the first thing an auditor asks to see.
- You hold a valid proof of origin — a statement on origin, supplier's declaration, EUR.1 movement certificate or REX (Registered Exporter) reference — for every preferential duty rate claimed in the last three years.
- Long-term supplier declarations are in date, and you have a renewal process that catches them before they expire.
- Each preference claim can be traced to the specific trade agreement and rule of origin it relies on.
- Preference is re-checked whenever sourcing changes — a new factory, supplier or country of dispatch can invalidate origin.
- You review where eligible preference is going unclaimed as well as where it is claimed. In our analysis of 2.3 million UK textile declarations, 53% showed preference-claim gaps — duty paid that a valid claim would have removed. See origin & preference audit.
Tariff classification
One wrong commodity code changes the duty rate on every entry that inherits it.
- Every commodity code in live use has a documented rationale — a product specification, written classification logic, or a ruling.
- Codes are reviewed when products change and when the UK tariff schedule updates, not set once and copied forward.
- The same product is never declared under different codes across entries, agents or ports.
- Borderline or high-duty classifications with material exposure are supported by an Advance Tariff Ruling (ATR) or written professional advice.
- Someone in your business owns commodity-code decisions — agents and brokers are given codes, not left to guess them.
Customs valuation
Small per-entry valuation gaps compound across a full import book — in either direction.
- You can show how the customs value on each entry was built up: the price paid or payable, plus required additions, minus permitted deductions.
- Additions such as assists, tooling, royalties and licence fees are consistently included where they apply.
- Freight and insurance are treated correctly for the Incoterms actually used on each shipment, not defaulted.
- Prices from related parties are supported by evidence that the relationship did not influence the price.
- Retrospective adjustments — rebates, credit notes, transfer-pricing true-ups — are reflected in the declared values they affect.
Special procedures & reliefs
Special procedures suspend or remove duty — until the paperwork discipline slips and the relief fails on inspection.
- Every special procedure you use — Inward Processing, Customs Warehousing, Temporary Admission, Authorised Use — has a valid authorisation, and you operate within its conditions.
- Bills of discharge are submitted on time, and your stock and throughput records reconcile to them.
- Returned Goods Relief (RGR) claims are supported by evidence of the original export — particularly important for returns-heavy ecommerce operations.
- You periodically review entries that paid full duty for reliefs that were available but never applied — a common source of reclaimable overpaid duty.
Declaration data quality
17% of UK declarations contain errors. Inconsistent data is exactly the pattern risk profiling is built to find.
- You pull your own declaration data — MSS (Management Support System) or CDS (Customs Declaration Service) reports — at least quarterly, rather than relying on agent paperwork.
- Declared values, weights, quantities and currencies reconcile against commercial invoices and shipping records.
- Anomalies — duplicate entries, outlier values, mismatched units — are investigated and corrected, not left to accumulate.
- EORI (Economic Operators Registration and Identification) numbers, procedure codes and document codes are correct and consistent across your entries.
- When you find an error, you disclose and correct it promptly — voluntary disclosure before HMRC finds the same error is generally treated more favourably.
Agent oversight
Your agents file entries in your name. The entries — and the errors in them — are your liability, not theirs.
- A written authorisation is in place for every customs agent, and you know whether each one acts as your direct or indirect representative.
- You hold copies of the declarations filed in your name — not just the agent's invoices.
- You audit a sample of agent-filed entries against your own commercial records on a regular cycle.
- Agent error rates are monitored, and recurring mistakes feed back into your standing instructions.
A checklist tells you what to check. Your data tells you where you stand.
How often should you run through this checklist?
As a minimum: pull and reconcile your own declaration data quarterly, and work through the full checklist at least once a year. Compliance drifts — products change, tariff schedules update, supplier declarations expire — so a checklist completed once and filed away protects nobody.
Re-run the relevant sections whenever something changes:
To understand what puts an importer on HMRC's radar in the first place, see our guide to what triggers an HMRC customs audit.
How do you check this against your actual declarations?
A checklist scores your intentions. Your declaration history scores your reality — and the two often disagree, because errors accumulate quietly across hundreds of entries filed by different people over several years.
That's why we publish this checklist free and ungated, and why the next step isn't a download — it's your data. The free compliance check walks you through the same six dimensions interactively and gives you a banded readiness view in minutes. From there, BorderAudit's audit readiness score analyses your actual declarations across every dimension on this page and quantifies the duty at risk in each one.
BorderAudit is a post-clearance customs audit platform used by 200+ businesses. It checks every declaration — not a sample — against the six dimensions above, surfacing both compliance risk and overpaid duty while the three-year window is still open.
The customs audit checklist, answered.
Stop scoring yourself on intentions.
The free compliance check walks the same six dimensions against your answers in minutes — then the platform checks every declaration, not a sample, while the three-year window is still open. Free to start. Flat pricing. No success fees.