When importing goods into the UK under a trade agreement, you may be eligible for reduced or zero customs duty.
Importer’s Knowledge UK is a method that allows businesses to claim preferential duty rates without relying on an exporter’s declaration — but it comes with strict compliance rules. Here’s what every UK importer should know before using it.
This guide explains what Importer’s Knowledge means, when to use it, what documents you need, and how to stay compliant with HMRC and UK–EU Trade and Cooperation Agreement (TCA) requirements.
What Is Importer’s Knowledge (IOK)?
Importer’s Knowledge is a method that allows a UK importer to claim preferential duty rates based on information they already hold about a product’s origin — without needing a statement on origin from the exporter.
In other words, the importer declares that the goods qualify as “originating” under a free trade agreement (FTA), and holds all the necessary proof at the time of import.
This process is detailed in official HMRC guidance on proving originating status and claiming preference using Importer’s Knowledge
It’s a convenient option, but it carries risk:
If HMRC later finds that evidence wasn’t in place at the time of import, the importer will be liable for unpaid duties and any penalties.
When Can You Use Importer’s Knowledge?
You can use Importer’s Knowledge if you have direct access to the information that confirms the origin of your goods.
For example, if you’re an importer who supplied machinery, materials, or technology to an EU-based manufacturer and the finished goods are shipped back to the UK, you likely have sufficient documentation and insight into the production process to support an IOK claim.
However, if you don’t have clear evidence, it’s safer to rely on the exporter’s declaration of origin instead.
Evidence Required for Importer’s Knowledge Claims
If you make an import declaration under Importer’s Knowledge, you must be able to show full traceability of your goods. HMRC can request this evidence during an audit, so it must be held at the time of import — not created afterwards.
Here’s what you need to retain:
| Evidence Type | What to Record or Show |
|---|---|
| Commodity code (HS code) | The correct classification of your goods |
| Production process | Description of how the goods were made, including origin of materials |
| Origin rule applied | Whether goods are wholly obtained or sufficiently worked or processed |
| Value evidence | Product value and value of non-originating materials to verify compliance with the value rule |
| Weight evidence | Product weight and any non-originating materials if the rule of origin is based on weight |
| List of non-originating materials | With their tariff codes (2-, 4-, or 6-digit, as required) |
| Transformation records | Whether goods were altered or transformed in transit |
| Additional supporting documents | Supplier declarations, invoices, production records, or bills of materials |
Keep these records for at least three years, or longer if required under the specific trade agreement.
Using Importer’s Knowledge Under the UK–EU Trade and Cooperation Agreement
The UK–EU TCA allows importers to use either:
- An exporter’s statement on origin, or
- Importer’s Knowledge (IOK)
You can identify which method has been used by checking the document code in Box 44 of your customs declaration:
| Code | Meaning |
|---|---|
| U110 + U111 | Exporter’s statement on origin used as evidence |
| U112 | Importer’s Knowledge used as evidence |
When U112 is declared, the importer bears full responsibility for holding valid proof of origin.
Key Difference Between Exporter’s Declaration and Importer’s Knowledge
| Method | Who Holds Evidence | HMRC Audit Access |
|---|---|---|
| Exporter’s Statement on Origin | Exporter | HMRC can request documents through the exporter’s national customs authority |
| Importer’s Knowledge (U112) | Importer | HMRC cannot request supporting evidence from abroad — responsibility lies solely with the UK importer |
This distinction is important. If you use Importer’s Knowledge without proper documentation, HMRC will hold you, the importer, accountable — not your supplier or manufacturer.
Common Mistakes When Using Importer’s Knowledge
- Assuming goods qualify by country of dispatch
Just because goods were shipped from the EU doesn’t mean they originate there. Always verify compliance with origin rules. - Claiming without documentary proof
You must hold the evidence before import — retrospective collection doesn’t satisfy HMRC audits. - Incorrect tariff classification
Misclassifying goods can invalidate your origin claim. - Mixing materials from multiple origins without record
You must show exactly how much non-originating material was used.
Best Practice Tips for UK Importers
- Verify supplier information early. Ask for origin documentation before shipping.
- Keep detailed records. File production, sourcing, and transport documents securely.
- Double-check your declaration codes. Ensure the correct preference code (U112) is applied only when confident in your evidence.
- Seek expert help. Customs rules differ between trade agreements — getting professional advice avoids costly errors.
Summary: Proceed With Care
Importer’s Knowledge can simplify trade and save you money — but only if you meet all the compliance requirements.
It’s best suited for importers who have direct insight into the production process or strong relationships with their suppliers.
If you’re unsure whether your goods qualify, it’s safer to use the exporter’s statement on origin.
Need help with Importer’s Knowledge or Rules of Origin?
At Transportify, we help importers navigate customs regulations, prepare origin evidence, and stay compliant with HMRC requirements under the UK–EU Trade and Cooperation Agreement and other FTAs.
📧 Get expert customs support: solutions@transportify.co.uk
🔗 Learn more: transportify.co.uk/
