LOGISTICS 101
Shipping pallets internationally can be straightforward when the right information and documents are in place. But when customs requirements are missed or shipment details do not line up, pallets can be delayed, held for inspection, or rejected at the border altogether.
For businesses, a border problem rarely stays a paperwork problem. It turns into storage charges, missed delivery dates, frustrated customers, and disruption that ripples down the supply chain. The good news is that the large majority of border rejections come down to avoidable mistakes — and almost all of them can be caught before a shipment leaves the warehouse.
This guide explains what border rejection actually means, the most common reasons pallets are stopped, what happens when a shipment is held, and the practical steps that keep freight moving through customs smoothly.
What border rejection means
When goods cross an international border, customs authorities check that the shipment complies with that country's import and export rules. They rely almost entirely on the documents and declarations provided, supported where necessary by a physical inspection of the goods.
A pallet can be held, inspected, or turned away for two broad reasons: something is wrong with the paperwork, or something is wrong with the physical shipment. Paperwork problems are by far the most common. A recent analysis of more than 600,000 UK customs declarations found an average error rate of around 34%, and modern customs systems have only become more sensitive to discrepancies. Physical problems are less frequent but just as disruptive, and the single biggest one is non-compliant wood packaging.
A held shipment is not always a rejected one. Many are simply delayed until a missing document is supplied or a discrepancy is corrected. But every hold costs time and often money, which is why prevention matters far more than cure.
The most common reasons pallets are stopped
Most border problems trace back to the same handful of issues:
- vague or inaccurate product descriptions
- incorrect commodity (HS) codes
- incomplete or inconsistent commercial invoices
- missing or mismatched EORI and importer details
- incorrect declared value
- confusion between country of dispatch and country of origin
- missing licences, certificates, or permits
- restricted or prohibited goods
- non-compliant ISPM 15 wood packaging
- Incoterms confusion over who is responsible for duties
Each of these is worth understanding in turn, because the fix is almost always simple once you know what customs are looking for.
Commercial invoice mistakes
The commercial invoice sits at the foundation of customs clearance. It is the primary document authorities use to assess duty, verify origin, and confirm the value of a consignment. If it is incomplete or inconsistent with the rest of the shipment, clearance stalls while authorities ask questions.
A complete commercial invoice should clearly show the full names and addresses of both sender and receiver, EORI or tax numbers where required, a detailed description of the goods, the commodity code, the country of origin, the value and currency, the quantity, the agreed Incoterms, and the reason for export.
The single most important principle is consistency. Every figure and detail on the invoice must match the customs declaration and the actual contents of the pallet. If the invoice states one value and the declaration states another, that gap alone can trap the shipment. A brief check that the invoice, packing list, and declaration all agree takes a few minutes and prevents days of delay.
One common valuation trap is worth flagging: when freight and insurance costs are bundled into a single invoice total, customs may be unable to calculate the dutiable value correctly. Depending on the Incoterms used, this can lead to overpaid duty or a valuation query that holds the shipment until corrected figures are provided.
Commodity code (HS code) errors
Every product moving internationally must be classified under a commodity code, also known as a tariff or HS code. In the UK, import classifications run to ten digits, and the UK Trade Tariff contains over 200,000 of them. This single code determines the duty rate, the VAT, whether any licences are required, and whether restrictions apply.
Getting it wrong is one of the most common and costly mistakes in international shipping. A wrong code can mean overpaid or underpaid duty, and underpayment can trigger a post-clearance demand from HMRC plus interest and penalties. In serious cases it can lead to a compliance investigation affecting past and future shipments.
A particularly common error is copying the code a supplier provides without checking it. A supplier’s code — especially on invoices from outside the UK — is often based on their own country’s export tariff and may not match the correct UK import code. The legal responsibility for declaring the right code sits with the importer, not the supplier. It is always worth verifying the code against the official UK Trade Tariff before shipping.
Wrong or missing EORI and importer details
Both the exporter and, in most cases, the importer need a valid EORI (Economic Operators Registration and Identification) number. For shipments into the UK, the importer needs an active GB EORI — without one, clearance cannot proceed.
A subtler problem catches out even experienced shippers. If the company name and address on the commercial invoice do not exactly match the details registered against the EORI number, automated customs systems can reject the mismatch and hold the cargo until it is resolved. It is worth confirming that EORI details are active and that they match your paperwork exactly before dispatch, rather than discovering the problem when the shipment is already stuck.
Incorrect declared value
Declared value sits at the heart of how customs assess duty and VAT, so it attracts close attention. A value that looks too low invites suspicion of under-declaration, while an inconsistent value across documents triggers a query.
Under-declaring value — whether deliberately or by mistake — is a serious issue that can lead to penalties, not just delays. Equally, failing to include freight or insurance in the customs value where the Incoterms require it can result in an inaccurate declaration. The safest approach is to declare the true transaction value, make sure it is identical across all documents, and break out freight and insurance costs clearly where relevant.
Country of origin and rules of origin
This is one of the most widely misunderstood areas of international shipping, and a common reason businesses either overpay duty or run into compliance problems.
The country of origin is not necessarily the country a shipment is sent from. Origin is the country where the goods were wholly produced or underwent their last substantial transformation. A pallet dispatched from Germany does not automatically have German origin if the goods were made elsewhere.
This distinction matters because the UK has trade agreements with many countries that offer preferential (reduced or zero) duty rates — but only for goods that genuinely meet the rules of origin for that agreement. A common and costly assumption is that because goods are shipped from a country the UK has an agreement with, they automatically qualify. They do not. Under the UK-EU Trade and Cooperation Agreement, for example, goods only qualify for zero tariff if they meet specific product rules, and a product assembled from a high proportion of non-originating parts may not qualify even if final assembly took place locally.
To claim a preferential rate, you generally need proof of origin documentation, such as a statement on origin, from your supplier. Claiming preference without the goods actually meeting the criteria is risky: if HMRC cannot verify the claim, it can demand back-duty on relevant shipments going back up to three years. It is far safer to confirm genuine origin and hold the supporting evidence than to assume eligibility.
Missing licences, certificates, or permits
Some goods need additional documentation before they can legally enter another country. If those documents are missing, the shipment is very likely to be held or refused.
Depending on the goods and destination, this can include import or export licences, health certificates, phytosanitary certificates, or proof of origin. Additional checks are particularly common for food products, plants and wood products, chemicals, medical goods, animal products, and other controlled goods. A shipment containing certain wooden products, for instance, may require phytosanitary certification before entering some countries.
Requirements vary significantly between destinations, so it is always worth checking what the specific country requires well before shipping rather than discovering a gap at the border.
Restricted and prohibited goods
Border inspections sometimes uncover goods that are prohibited, restricted, or that require special approval. This can lead to refusal, seizure, fines, return of the goods, or in serious cases destruction.
Restricted and prohibited goods vary by country, but commonly include hazardous materials, certain chemicals, weapons, counterfeit goods, alcohol and tobacco, controlled medicines, and uncertified animal or plant products. Some of these are not banned outright but require additional declarations, certificates, or licences before they can be imported. If you are unsure whether your goods are restricted in the destination country, it is always safer to check before booking than to risk seizure later.
ISPM 15 pallet and wood packaging failures
The most common physical reason a pallet is rejected has nothing to do with the goods on top — it is the wood underneath.
ISPM 15 is the international standard requiring solid wood packaging — pallets, crates, and dunnage — used in international trade to be heat-treated and stamped with the official IPPC mark. The rule applies to wood packaging moving between Great Britain and other countries, including the EU. Customs officers actively look for the mark as proof of treatment, and a pallet that fails can hold up an entire consignment regardless of how perfect the paperwork is.
Several points catch businesses out:
- The IPPC mark must be clearly visible on at least two opposite sides. If it is hidden under stretch wrap or labels, customs cannot verify it, and an unverifiable mark is treated as a missing one.
- Hand-drawn or altered marks are not accepted and can lead to automatic rejection.
- Plywood, OSB, and plastic pallets are exempt, which is why some exporters switch to them for high-risk or high-frequency routes.
- Condition matters. Even a compliant pallet can be rejected if it carries bark, oil stains, debris, or visible pests.
- Enforcement is strictest for destinations such as the United States, Australia, China, and Canada.
Because ISPM 15 problems cannot be fixed once the pallet has been collected, this is firmly a pre-dispatch check. For a full breakdown, see our ISPM 15 compliance guide.
Incoterms confusion — who pays the duty?
Incoterms define who is responsible for each stage of the shipment, including duties and import clearance. Confusion here does not usually cause an outright rejection, but it regularly causes delays, unexpected bills, and refused deliveries when neither party realises they were responsible for clearance.
The three that cause the most confusion are:
- EXW (Ex Works) — the buyer takes responsibility almost from the seller's door, including export and import formalities.
- DAP (Delivered at Place) — the seller delivers to the destination, but the buyer is responsible for import duties and VAT.
- DDP (Delivered Duty Paid) — the seller takes responsibility for everything, including import duties and clearance in the destination country.
The most common real-world problem is a buyer who does not realise that under DAP or EXW, they are the importer of record and liable for the duty. The shipment arrives, a duty bill lands, nobody is prepared for it, and the pallet sits in a depot accruing storage charges while the issue is sorted out. Agreeing Incoterms clearly in advance — and making sure both sides understand what they mean — prevents this entirely.
Physical customs inspections
Not every pallet is physically inspected, but customs can select any shipment for examination. Inspections may be entirely random, or they may be triggered by incomplete documentation, values that look inaccurate, suspected restricted goods, or inconsistencies in the paperwork.
During an inspection, customs may open the shipment, verify quantities, inspect the packaging, review the paperwork, and request additional information. It is worth being realistic about this: even a perfectly prepared, fully compliant shipment can be selected for a random check and delayed as a result. Good preparation dramatically reduces the chance of a hold, but it cannot eliminate the possibility of a random inspection entirely.
What happens if a pallet is stopped
If a shipment cannot clear customs, the outcome depends on the issue and the destination country’s rules. The shipment may be delayed pending additional documents, undergo further inspection, incur storage charges, be returned to the sender, be refused entry, or require corrected customs declarations. It may also face additional duties or penalties, and in serious cases involving prohibited goods, customs may seize or destroy it. Depending on the route and location, storage, demurrage, or handling charges may begin accruing while the shipment is held awaiting customs release — and these can add up quickly.
Beyond the direct cost, a border hold creates knock-on problems for delivery schedules and customer orders — which is often the more damaging consequence for time-sensitive freight.
An important change for EU shipments in 2026
If you ship low-value goods to the EU, there is a significant change to be aware of. From July 2026, the EU is removing its €150 duty de minimis exemption. Previously, goods valued under €150 could enter the EU duty-free. Once the change takes effect, every import into the EU becomes subject to customs duty regardless of value.
For e-commerce businesses and anyone shipping smaller consignments to the EU, this means duty now needs to be factored into pricing and paperwork on shipments that were previously exempt. It is worth reviewing your EU shipping process ahead of the change rather than being caught out afterwards.
How to prevent border problems
Good preparation is the single best defence against customs delays and rejected pallets.
Make sure all paperwork matches. Quantities, values, weights, descriptions, and consignee details should be identical across the invoice, packing list, and customs declaration. Inconsistent paperwork is one of the quickest ways to trigger an inspection.
Use specific product descriptions. State what the goods are, what they are made from, and what they are used for. “Metal machine components” clears far more easily than “parts.”
Verify your commodity codes. Confirm the correct UK code against the Trade Tariff rather than relying on a supplier’s export code, and check whether any licences or restrictions apply.
Confirm EORI details are active and matching. Check that the name and address tied to the EORI match the invoice exactly.
Get origin right. Confirm where the goods genuinely originate, and only claim preferential rates when you hold the supporting evidence.
Agree Incoterms clearly. Make sure both parties know who is responsible for duties and import clearance before the shipment moves.
Get the pallet right. For international wood packaging, confirm ISPM 15 compliance and that the IPPC mark is visible on at least two opposite sides after wrapping.
Keep records and photographs. Before collection, photograph the pallet, keep copies of invoices and customs documents, and save booking and tracking information. This helps if customs request clarification or a dispute arises later.
On more complex routes or higher-value shipments, many businesses also use a customs broker to reduce the risk of declaration errors and keep clearance moving.
Border-ready checklist
Before dispatching international pallet freight, check that:
- product descriptions are accurate and specific
- the commercial invoice is complete and consistent
- shipment values are correct and match the declaration
- commodity codes are verified against UK classifications
- EORI numbers are active and match the paperwork
- country of origin is correct and preference claims are supported
- any required certificates or licences are included
- Incoterms are agreed and understood by both parties
- ISPM 15 wood packaging requirements are met
- restricted goods rules have been checked for the destination
- all paperwork matches the shipment exactly
A short review before booking can prevent significant delays and costs later.
What we can and cannot control
To keep responsibilities clear, it is worth setting out where our role begins and ends. We can help you understand what documentation is usually required, guide you through preparing your shipment, and support you throughout the booking process.
What we cannot control is the customs authority’s decisions. Duty assessments, the timing of clearance, whether a shipment is selected for inspection, and final release all sit with customs in the destination country. Responsibility for declaring goods accurately, holding the right certificates, and ensuring the shipment is compliant ultimately rests with the shipper. Our role is to make that process as smooth and well-informed as possible.
Final thoughts
International pallet shipping does not need to be complicated, but customs clearance depends heavily on accurate information and proper preparation. Most border problems happen for the same handful of reasons: inaccurate shipment details, incomplete or inconsistent paperwork, undeclared or restricted goods, missing certificates, and non-compliant wood packaging.
With accurate declarations, consistent paperwork, the right commodity codes, correct origin information, and a compliant pallet, international shipments move through customs far more smoothly and with far fewer delays.
At Pallet2Ship, we help businesses move freight internationally with straightforward guidance and reliable support throughout the process. If you are unsure what documents your shipment requires, our team can help you understand the requirements before booking, helping reduce the risk of delays, rejected pallets, and unnecessary customs issues later on.