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An Post customs forms for Irish sellers posting overseas

Revenue says goods sent outside the EU, including Great Britain, require a customs declaration. Prepare your item data, choose a label workflow and select Northern Ireland for orders going there.

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Linocut print of a parcel with a blank string tag beside a rubber stamp and an ink pad

For goods sent outside the EU, including Great Britain, complete a customs declaration yourself or through an agent, according to Revenue. Depending on the label workflow, have item descriptions, values and weights ready, or Shopify product weights, HS codes and country of origin.

At a glance

Declaration required
Revenue says goods exported outside the EU, including Great Britain, require a customs declaration.
Item data
Prepare descriptions, values and weights for the Great Britain label workflow.
Shopify product data
Prepare product weights, HS codes and country of origin.
Hub documents
An Post promotional copy says eCommerce Hub can generate CN23 customs documents automatically.
Automation cost
Shiptheory’s Shopify App Store listing prices Earth at $62 a month or $600 a year.
On this page

Check the destination before creating the label

Read the delivery address before choosing the shipping destination. Revenue says goods sent outside the EU, including Great Britain, need a declaration completed by the seller or an agent. Decide who will complete it before processing the order.

EirPost says parcels from Ireland to Northern Ireland need no customs declaration, and asks sellers to select Northern Ireland and finish the address with a postcode beginning with the letters B and T.

For a Northern Ireland order, select Northern Ireland and enter the customer’s postcode beginning with the letters B and T. Read the guide to shipping orders to Northern Ireland when preparing that route for your shop.

For Great Britain and other destinations outside the EU, prepare the declaration data alongside the delivery address. If an agent completes your declarations, arrange that work before you create the shipping label.

Prepare the product and order data

Gather the item description, value and weight for the Great Britain label flow. Work through the goods in the order and prepare the entries before opening the label screen.

  • Write the item description you will enter for the goods.
  • Have the item value ready for the declaration.
  • Have the item weight ready for the label workflow.

EirLink says it reads customs fields from Shopify product weights, HS codes and country of origin, and connecting your own account requires an An Post eCommHub business account with API access enabled and its API key, with postage billed directly at your agreed An Post rates.

For that Shopify connection, open the product records you plan to ship overseas. Review the weight, HS code and country of origin entries before processing those orders. Gather your account details and API key while checking the catalogue.

An Post CN22 and CN23 customs documents

An Post promotional copy published by Business Plus says eCommerce Hub can generate CN23 customs documents automatically for international orders.

EirPost says its Great Britain flow generates an electronic customs declaration from item description, value and weight, while its US page describes a CN22-style declaration generated from item details.

Use the data fields named for your chosen destination and service when preparing the order. For a Hub connection, use the eCommerce Hub and Shopify guide to plan the setup.

Customs functions described by An Post and Shiptheory
OptionCustoms functionOrder handling
An Post eCommerce HubAutomatic CN23 customs documents, according to An Post promotional copyThe promotional copy describes this for international orders
ShiptheoryGenerates customs documents, according to ShiptheoryImports orders, generates labels and updates tracking across connected sales channels

Plan the order connection

Shiptheory says it imports orders, generates labels and customs documents, and updates tracking across connected sales channels.

Before choosing a plan, count the users, sales channels and carriers you want to connect. Then count the shipments you expect to process each month.

  1. Identify the sales channel whose orders you want to import.
  2. List the carriers you need for those orders.
  3. Count the people who need access to the shipping tool.
  4. Compare your monthly shipment count with the plan allowance.

If you connect your own An Post account to Shopify, have API access enabled and get the API key before setup. Check the product customs fields before processing imported overseas orders.

Handle labels, customs documents and tracking

Check the imported order’s destination and item data before generating the label and customs documents. For a Great Britain order, check the description, value and weight entries.

For a workflow that reads Shopify product data, check the weight, HS code and country of origin entries for each product in the order. If a field needs changing, update the product record before creating the label.

Shiptheory says it updates tracking across connected sales channels. Check which of your sales channels you need tracking updates sent to when choosing an order connection.

For Northern Ireland, review the destination selection and postcode beginning with the letters B and T at the address stage. For a US order, prepare the item details used by the declaration workflow before generating its documents.

Compare the software cost and account terms

According to its Shopify App Store listing, Shiptheory’s Earth plan costs $62 a month or $600 a year. Choose the billing period after checking the user, channel, carrier and shipment figures.

Shiptheory Earth plan as listed in the Shopify App Store
Plan termListed allowance or price
Monthly billing$62 a month
Annual billing$600 a year
Users1
Sales channels1
Carriers2
Shipments1,500 a month

If you connect your own An Post account, budget for postage at the rates agreed with An Post. Ask about your account terms if you need to establish the contracted rate before setting customer delivery charges.

Questions

Do I need an An Post customs form for goods sent to Britain?

Revenue says goods exported outside the EU, including Great Britain, require a customs declaration completed by the seller or an agent.

Can An Post eCommerce Hub generate CN23 customs documents?

An Post promotional copy on Business Plus says eCommerce Hub can generate CN23 customs documents automatically for international orders.

Does Shiptheory generate customs documents?

Shiptheory says it imports orders, generates labels and customs documents, and updates tracking across connected sales channels.

How much does Shiptheory cost for a Shopify shop?

Its Shopify App Store listing prices Earth at $62 a month or $600 a year. The plan covers 1 user, 1 sales channel and 2 carriers, with a limit of 1,500 shipments a month.

Sources

  1. Revenue: Exporting goods, read 10 October 2026
  2. EirPost: Send a Parcel from Ireland to UK from €8: EirPost, read 10 October 2026
  3. Business Plus: Unlock business growth with An Post Commerce, read 10 October 2026
  4. EirLink: An Post Shopify integration, read 10 October 2026
  5. Shiptheory: An Post Shipping Integration: Shiptheory, read 10 October 2026
  6. Shopify App Store: Shiptheory, read 10 October 2026
  7. EirPost: Send a Parcel from Ireland to USA from €13.50: EirPost, read 10 October 2026
  8. EirPost: Send a Parcel from Ireland to Northern Ireland from €8: EirPost, read 10 October 2026

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