Customs Postal Data
Identify what data and documentation is required when sending on our globalpriority services
A customs declaration is required for all parcels exported from the UK to overseas destinations, as well as for parcels imported into the UK. As the sender, you’re responsible for ensuring the declaration is full and accurate, as you are legally liable for the parcel’s contents.
Customs authorities rely on this information to check that items meet national regulations and to determine any taxes or duties that may apply. If the declaration is incomplete or inaccurate, your parcel may be delayed, held, or returned by customs - resulting in longer delivery times.
The CN23 is the standard postal customs declaration used internationally to capture essential details about the contents of a parcel to support postal customs clearance processes in both the UK and overseas destinations.
Each destination sets its own import controls and restrictions. Customers should always check whether the items they’re sending require any licences, certificates, or may incur additional charges upon import. For detailed, country specific requirements, please visit our individual country pages.
*Please note: When sending items from Northern Ireland to the EU, customs declarations are not required when sending gifts or goods. Our shipping systems may still prompt for this data and generate a CN23, but it should not be attached to the parcel.
A commercial invoice is a key supporting document used for customs purposes. It provides overseas authorities with the essential information they need to verify the goods being sent, including their value, description, and origin. This allows customs to assess compliance with local regulations and determine any duties or taxes that may be applicable.
Where required, supporting documents such as commercial invoices, certificates, and licences must be physically supplied when sending your item. These documents should be placed in a clear plastic wallet securely affixed to the outside of the parcel, ensuring all information is fully legible.
We recommend attaching the wallet on the same side as the address label wherever possible. If space is limited, it may be placed on the reverse of the parcel, provided it remains clearly visible and securely affixed.
Missing, invalid, or incomplete documentation can result in your item being delayed, held by customs, or returned to the sender. All supporting documents must be completed accurately before collection or drop off at a Post Office® or depot.
As the sender, you are responsible for ensuring that all information provided for customs purposes is true, complete, and accurate. Parcelforce Worldwide cannot be held liable for incorrect or misleading declarations. We strongly advise familiarising yourself with the relevant export and import customs regulations before shipping.
Electronic customs data is mandatory for all international parcels. Pre registration schemes such as the Import One Stop Shop (IOSS) depend on accurate and complete electronic data to ensure items clear customs smoothly and without delay.
Any parcel with missing, incorrect, or incomplete electronic data may be delayed, held by customs, or returned to the sender.
This is the documentation you should see and expect to complete if sending your item via our online journey.
International account holders can enter all the required customs information directly through Click & Drop®. These systems will automatically generate the appropriate documentation, such as CN23 forms or commercial invoices based on the data you provide.
It is essential that the information submitted is a true and accurate reflection of the items being dispatched, as this data forms part of the Electronic Customs Data used by overseas customs authorities. Parcelforce Worldwide cannot be held liable for any inaccuracies; the sender is legally responsible for ensuring all customs information is complete, compliant, and accurately reflects the contents of the parcel.
We strongly recommend familiarising yourself with relevant export and import customs regulations to ensure items can be processed and cleared without delay.
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Certain goods exported to specific countries may require an export licence or additional documentation often issued by relevant regulatory bodies. Where a licence or certificate is required, it must be physically attached to the outside of the parcel in a clearly marked envelope.
Customers must also provide details of these documents electronically during the booking process.
Before shipping, please check with the appropriate government department to confirm whether your goods require any additional licences or certificates. The following resource may be helpful when determining export requirements:
For parcels sent to destinations outside of the UK, the thresholds at which taxes and duties become payable vary by country and are determined by the local customs authorities. We strongly recommend checking the threshold applicable to the destination you are sending to.
Customers should also refer to the destination country’s official customs authority website to ensure they have the most accurate and up to date information on thresholds, import restrictions, and any additional requirements.
For customers sending items from Northern Ireland to the EU, a customs declaration is not required. As NI remains aligned with the EU Customs Union, customs taxes and duties do not apply. Where duties are applicable for other international destinations, they are typically calculated based on the contents, value, and weight of the parcel.
Yes, if you are shipping item/s to the Channel Islands you will require custom declarations. This includes Jersey, Guernsey, Alderney, Herm and Sark. Please note goods to Jersey may also be liable for GST (Goods and Service Tax) which is currently 5%. Find out more about shipping to the Channel Islands at our Worldwide Directory.
There are a range of organisations in the UK who can help you with all the above. As a starting point and for additional information about exporting goods from the UK please visit the HM Revenue & Customs website here.
To check your item is not prohibited or restricted, please click here.
For UPU or country-specific prohibitions and restrictions, please click here.