5 Customs Classification Mistakes That Mean Fines (And How to Avoid Them)

If your business imports goods, whether electronic components, automotive parts or food and drink products, customs classification is more than a back-office formality. It’s one of the most high-risk compliance areas in international trade. One wrong code can delay shipments, trigger audits and lead to fines in the tens of thousands.

At TariffTel, we’ve helped many businesses classify millions of products accurately and compliantly. Below, we break down the five most common customs classification mistakes across food and drink, manufacturing, electricals and retail, and how to avoid them, whatever industry you’re in. This is precisely where TTVerified adds value — expert-backed, audit-ready classification at scale.

The five customs classification mistakes we see most often are:

1. Underestimating how wrong a code can be.
2. Classifying by hand or with ChatGPT.
3. Assuming a code never changes.
4. Thinking low volume means low risk.
5. Leaving classification to your broker.

Mistake 1: Underestimating how wrong a code can be

Answer: Very wrong, and very expensive.
The Harmonised System (HS) determines import duties, restrictions and safety requirements. A misclassified product can lead to:

• Higher-than-necessary import duties
• Shipment seizures
• Persistent audits from HMRC or equivalent authorities

Example: An electronics importer used a generic code for lithium-ion battery packs instead of one reflecting their classification as dangerous goods. Customs held the shipment, issued a penalty, and flagged the company for future inspections.

Key takeaway: Even similar products can have vastly different codes due to intended use, power capacity or safety risk.

Mistake 2: Classifying by hand or with ChatGPT

Answer: That’s a dangerous assumption.

Manual classification tools or general search engines or AI often lack the nuance needed for modern, multi-component products. Factors like material composition, origin or end use can shift classification.

Industry insight: In our experience, internal teams frequently rely on internal spreadsheets or ad hoc knowledge. We regularly see that 2 in every 5 tariff codes are wrong.

Why TariffTel: We combine algorithmic classification with expert human validation with our TTVerified and TTExplore platforms, so codes are expert-backed and audit-ready, catching the grey areas that trip up even experienced teams.

Mistake 3: Assuming a code never changes

Answer: Because codes – and interpretations – change.

The World Customs Organisation (WCO) updates HS codes every five years, with the next one expected in 2028. In addition to this, HMRC frequently issue binding classification opinions that reframe categories.

Example: A fashion brand used the same HS code for synthetic handbags for three years. After a rule update, those products moved into a new category with a higher tariff rate. The delay in updating resulted in overpayment and retroactive fines – all of which could have been avoided if the company had a process to keep up-to-date with tariff code changes.

Mistake 4: Thinking low volume means low risk

Answer: Yes – especially in regulated sectors.

Electronics, batteries, chemicals and food products are all subject to heightened scrutiny. Even small importers are flagged based on product category, not volume.

Example: A company importing aluminium casings with secondary uses for defence applications triggered a dual-use review. While the parts were benign on their own, their potential classification under Export Control Order 2008 required additional licenses. Something they hadn’t anticipated.

Risk is determined by what you ship – not how much you ship.

Mistake 5: Leaving classification to your broker

Answer: Brokers submit data, but liability rests with you.

Classification is only accurate so long as the information provided is accurate. Brokers typically don’t validate product data. At TariffTel, we work closely with your suppliers who know your product best to ensure all product data is correct.

Example: A UK food importer listed the wrong variety of tomato on documents and submitted this to their broker. With over 10,000 varieties this is easy to do and was a recent update in the HS 2025 amendments. The classification the broker assigned was therefore incorrect and could be corrected by customs leading to fines for misclassification.

The better way: Use a hybrid classification platform, like TariffTel, that ensures the inputs to your customs broker are accurate and aligned to live tariff guidance. Our understanding of the nuances involved in classification mean errors like this do not happen and you have peace of mind.

Why this matters now: Whether retail or electronics

TariffTel has helped leading retail and food and drink and fashion brands such as M&S, ASDA and Primark classify products with expert-backed tariff code accuracy. Now, as electronics and manufacturing firms face increasing scrutiny and tighter margins, our platform, and the people behind it, are proving invaluable across different industries.

High-risk industries need high-certainty classification. Whether it’s microchips or marinara sauce, these products face the same penalties if coded incorrectly. The difference is the complexity and TariffTel is purpose-built to handle the most complex of classifications.

What to do if you’ve already made a mistake

Finding a wrong code is not the disaster it feels like, as long as you act. Work through it in this order.

Check the scope. Pull the affected product and every declaration it has been used on, so you know how far back the error goes. HMRC can review up to three years of records.

Tell HMRC. If you have underpaid duty, make a voluntary disclosure. Coming to HMRC before they come to you usually reduces the penalty.

Reclaim or settle. If you have overpaid, you can claim it back using HMRC form C285, within three years. If you have underpaid, pay the difference as part of your disclosure.

Fix it going forward. Correct the code, record why it changed, and put a process in place so it cannot drift again. This is where a platform with a full audit trail earns its keep.

For the full picture of what errors can cost, read our guide to the consequences of misclassification

Get in touch with our team for more information about TariffTel and how it can support your classification.

Whether you want fast self-serve codes with TTExplore or expert-backed, audit-ready classification with TTVerified, we can help you get every code right, first time.