If you sell from the UK, US, Canada, Australia, Switzerland or another non-EU country to EU consumers, this change matters. It does not only affect tax teams. It affects checkout pricing, courier data, customer experience and delivery reliability.

For many merchants, the first sign of the change is a message from a courier or logistics partner asking for an IOSS number. That can be confusing if you have never dealt with IOSS before. The good news is that the idea is simple: IOSS helps you collect EU VAT at checkout and use a cleaner import process for eligible EU orders.

What is changing on 1 July 2026?

The EU is introducing a temporary €3 customs duty for goods imported into the EU in orders up to €150. The European Commission says this duty applies from 1 July 2026 and replaces the previous customs duty exemption for those orders until the wider customs reform takes effect. You can read the official Commission guidance here: European Commission guidance on the temporary €3 customs duty.

The Council of the EU has also confirmed that the interim €3 customs duty applies from 1 July 2026 to 1 July 2028, after which it is expected to be replaced by the new EU customs reform system. You can read the Council update here: Council final green light to new customs duty rules.

Why are sellers being asked to register for IOSS?

Many sellers are not searching for IOSS because they suddenly became interested in VAT schemes. They are searching because a courier, fulfilment centre, shipping platform or marketplace told them they need an IOSS number.

That request is usually practical. Couriers need customs data that works. They need a process that can handle EU VAT, the new customs duty and the import declaration flow without creating delays at the destination country. IOSS is one of the main ways to make that process more predictable for ecommerce orders.

The European Commission describes IOSS as a simplification that allows businesses to declare and pay VAT through a single registration instead of dealing with separate VAT processes in multiple countries. You can read the Commission’s IOSS information here: European Commission update on IOSS for ecommerce imports.

What is IOSS in plain English?

IOSS stands for Import One Stop Shop. It is an EU VAT scheme for businesses selling goods to EU consumers from outside the EU in orders up to €150.

Instead of the customer being asked to pay VAT when the parcel arrives, IOSS allows the seller to collect VAT at checkout. The seller then reports and pays the VAT through the IOSS process.

For the customer, this usually creates a clearer buying experience. They see the tax at checkout instead of receiving an unexpected payment request during delivery. For the seller, it creates a more structured way to handle EU VAT.

Why the €3 customs duty makes IOSS more urgent

Before 1 July 2026, many ecommerce sellers treated IOSS mainly as a VAT question. After 1 July 2026, it also becomes part of a bigger customs readiness question.

The new €3 customs duty means there is another amount that may need to be handled in the import process. That makes the difference between a clean IOSS route and a non-IOSS route much more important.

From the seller’s point of view, the problem is simple. If your checkout, tax setup and logistics data are not ready, the customer may face confusion, delays or unexpected delivery charges. That is exactly what most ecommerce merchants want to avoid.

Why couriers care about IOSS and Centralised Clearance

When goods enter the EU, customs clearance has to happen before the shipment can continue to the customer.

With IOSS, couriers can use Centralised Clearance. This means the customs process can be handled centrally in the EU country where the goods first enter, often the Netherlands, instead of running separate customs procedures in the customer’s destination country.

Without IOSS, Centralised Clearance cannot be used. The shipment must follow the destination country’s customs process instead.

From 1 July 2026, this becomes more important because the €3 customs duty needs to be handled as part of the import process. Some destination-country customs systems and courier flows are not ready to process the new duty efficiently for non-IOSS shipments.

What if DPD, DHL or FedEx asked you for an IOSS number?

We created courier-specific pages for merchants who have been asked for an IOSS number by a particular logistics provider. These pages explain the issue in the language sellers are likely to search for.

EAS is not limited to one courier. Your EAS IOSS setup can be used with DHL, DPD, FedEx, UPS, Royal Mail, Evri, postal operators, fulfilment partners, shipping platforms and other logistics companies that require your IOSS number.

What sellers need to do before 1 July 2026

The right preparation depends on your store, catalogue, courier process and existing tax setup. For most SME merchants, the practical checklist is straightforward.

How EAS helps with fast IOSS registration

EAS is designed for sellers who need a practical answer quickly. We do not only help with the registration. We help with the full setup around it.

All EAS IOSS plans include IOSS registration, IOSS intermediary service, automated data collection, reporting and filing, and free online store configuration for supported platforms. We also help prepare your checkout for the new €3 customs duty where it applies.

EAS supports Shopify, WooCommerce, Wix, Squarespace, Shopware, PrestaShop, custom-built stores and API-based workflows.

Why not just wait?

Waiting can feel easier, but it increases the risk of rushing later. Couriers and logistics companies are already preparing their networks before the change. If your business waits until the last moment, you may be trying to register, configure your checkout, adjust your shipping data and explain delivery changes to customers all at the same time.

The earlier you prepare, the easier it is to make the change calmly. You can also avoid a situation where EU orders are disrupted because the IOSS number, checkout setup or courier workflow is not ready.

What about larger businesses?

This article is written mainly for SME merchants, but the same issue applies to larger sellers. In fact, larger businesses often face more complexity because they may use several platforms, fulfilment centres, countries of dispatch and logistics partners.

For larger businesses, the question is not only “how do we get an IOSS number?” It is also “how do we make the IOSS number work across all our systems and logistics flows?”

EAS can support both simple and more complex setups, including API-based workflows and multiple store configurations.

Common mistakes to avoid

Thinking IOSS is only a tax number

The number is important, but it is not enough on its own. Your store setup, tax collection and monthly reporting also need to work.

Leaving the checkout unchanged

If your checkout does not collect the right amounts, the customer experience can suffer. EAS helps configure supported stores for EU VAT and the €3 customs duty where applicable.

Assuming one courier setup solves everything

Many sellers use multiple logistics partners. EAS IOSS can be used across courier, postal, fulfilment and shipping platform workflows where an IOSS number is required.

Managing IOSS manually

Manual reporting becomes difficult as order volumes grow. EAS automates the data collection, reporting and filing process.

Bottom line

The 1 July 2026 change is important, but it does not need to be confusing.

If you sell to EU consumers from outside the EU, and your courier or shipping partner has asked for an IOSS number, the safest practical approach is to register early, configure your store properly and make sure reporting is automated.

EAS helps businesses do exactly that. You get IOSS registration, intermediary service, store configuration, automated reporting and support for the new €3 customs duty in one service.

Official sources: European Commission guidance on the temporary €3 customs duty, European Commission IOSS information, Council of the EU confirmation of the interim duty rules.