Avoiding Costly Delays: The Most Common UK Import Declaration Mistakes (and How to Prevent Them)

For any UK-based business engaged in international trade, a correctly filed Import Declaration is more than just a regulatory formality—it’s the key to getting goods released swiftly and avoiding costly delays, penalties, and compliance risks.

Whether you're importing finished goods, raw materials, or specialist equipment, the moment your shipment lands in the UK, HMRC expects precise information that aligns with customs protocols. Yet, too many importers underestimate the complexity involved. From misclassified tariff codes to incorrect procedure codes, even experienced traders make mistakes that can stall goods at the border, inflate storage costs, or even lead to audits.

This article focuses on the most common errors importers make on import declarations, the real-world consequences they carry, and how to avoid them. If you’re looking to keep your supply chain running smoothly, this is where you start.

What Is an Import Declaration?

An Import Declaration is a digital submission to HMRC, typically through the Customs Declaration Service (CDS), that provides detailed information about goods entering the UK. This includes:

  • Commodity codes (HS/Tariff codes)

  • Customs Procedure Codes (CPCs)

  • Value and currency

  • Origin and destination

  • EORI number of the importer

  • Any applicable licenses or certificates

HMRC uses this information to calculate duties and VAT, verify compliance with trade rules, and decide whether to release or inspect the shipment.

1. Incorrect Tariff Classification (HS Code Errors)

The Mistake: Assigning the wrong HS (Harmonised System) code to your goods.

The Impact: HS codes drive duty rates, licensing needs, and quota applications. A misclassification can result in underpaid duties, post-clearance corrections, and even retroactive penalties. In severe cases, it may trigger shipment seizure.

The Fix: Use HMRC’s Trade Tariff tool or apply for a Binding Tariff Information (BTI) ruling. If you're unsure, Customs Declarations UK can assist in verifying the correct commodity code based on product specifications.

2. Omitting or Misusing the Customs Procedure Code (CPC)

The Mistake: Applying the wrong CPC, which tells HMRC the reason goods are being imported—e.g., for free circulation, warehousing, or inward processing.

The Impact: Using an incorrect CPC can result in higher duties or legal non-compliance. For example, using CPC 40 00 000 (free circulation) for goods meant for temporary import can trigger unnecessary charges and future audits.

The Fix: Always double-check your CPC against your intended use of the goods. Customs Declarations UK provides guidance on selecting the right CPC for your import purpose.

Undeclared or Incorrect Valuation

The Mistake: Providing an inaccurate value for customs purposes, either by mistake or in an attempt to reduce import duty.

The Impact: HMRC may adjust the value and back-charge duties and VAT—with added interest. Persistent misvaluations can put your company on a customs watch list.

The Fix: Declare the full transactional value, including shipping, insurance, and additional costs. Maintain clear records of all invoices and contracts. CDUK’s platform supports accurate customs valuation entry and flagging inconsistencies before submission.

4. Missing Licences or Import Certificates

The Mistake: Failing to attach required licences for restricted or controlled goods, such as chemicals, foodstuffs, or medical devices.

The Impact: Goods are held at the border until proper documentation is provided—causing delays, spoilage (for perishables), or penalty notices.

The Fix: Identify licensing requirements in advance. If you're unsure, CDUK helps importers check licence needs and submit them correctly through the CDS.

5. Inconsistent Documentation

The Mistake: Submitting an Import Declaration that doesn’t match your commercial invoice, packing list, or transport documentation.

The Impact: Customs may query your entry, delaying clearance or suspending the goods until clarification is provided.

The Fix: Ensure all documents show matching product descriptions, quantities, weights, and values. Customs Declarations UK automates this cross-verification step to reduce manual errors.

6. Late or Missed Entry Summary Declarations (ENS)

The Mistake: Overlooking the Entry Summary Declaration when required—especially for goods coming from the EU into Great Britain post-Brexit.

The Impact: Without a valid ENS, goods may not be allowed entry or may be flagged for inspection, delaying your entire consignment.

The Fix: Confirm with your carrier or logistics partner that the ENS has been filed. CDUK provides ENS tracking and filing support to ensure compliance.

Why These Mistakes Keep Happening

Many importers rely on freight forwarders or internal admin teams unfamiliar with changing UK customs procedures. Post-Brexit updates, the move from CHIEF to CDS, and regular tariff amendments make staying compliant harder than ever.

While larger corporations have in-house customs teams, SMEs are particularly vulnerable to fines, clearance delays, and preventable audits due to documentation errors.

Let the Experts Handle It: Customs Declarations UK

At Customs Declarations UK, we specialise in accurate, compliant, and fully managed import declarations through the UK’s CDS system. Whether you're importing one container a month or managing daily shipments, our platform and expert team ensure your data is correct, your documents are aligned, and your goods clear the border without friction.

Our services include:

  • HS code classification support

  • CPC and valuation guidance

  • Licence and certificate compliance checks

  • ENS and import declaration filing

  • Audit-proof documentation storage

With Customs Declarations UK, you get peace of mind, speed, and compliance—backed by real people and smart automation.

Final Thoughts

The Import Declaration may seem like just another form—but get it wrong, and you could face days of delay, increased costs, or worse. In a time where efficiency, accuracy, and reliability define business success, there's no room for customs guesswork.

Avoid costly mistakes and stay ahead of UK import requirements by partnering with experts who know the process inside out. Customs Declarations UK is here to make sure every import you file is smooth, accurate, and HMRC-ready.

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