EU VAT for UK E-commerce: OSS, IOSS and When Each Applies

The One-Stop Shop (OSS) schemes are the EU answer to the compliance multiplier that B2C cross-border sales would otherwise create. Without OSS, a UK seller selling regularly into every EU member state would face up to twenty-six member-state VAT registrations, each with its own language, portal, return cycle, and audit risk. OSS collapses that into a single quarterly EU return filed through one member state, which redistributes the collected VAT to the relevant consumer countries.

This piece sits inside the cross-border VAT pillar and walks both OSS variants from a UK seller perspective: when each applies, how to register, what the returns look like, and where OSS does not solve the problem. Its Week 3 companions cover US sales tax nexus for UK e-commerce brands and the VAT treatment of digital products and downloadable e-commerce goods, the latter being the supply type that drives most UK Non-Union OSS use.

Two OSS schemes, not one

There are two distinct OSS schemes, and the right one for a UK seller depends on where the seller is established and what is being supplied. They share the OSS branding but cover different scenarios.

• Union OSS: for sellers established in the EU, covering B2C distance sales of goods within the EU and B2C electronically supplied services to EU consumers from an EU establishment.
• Non-Union OSS: for sellers established outside the EU, covering B2C supplies of services (including electronically supplied services) to EU consumers.

A UK-only seller with no EU establishment is in the Non-Union OSS lane for digital and other B2C services into the EU. Union OSS only becomes relevant where the UK seller has an EU subsidiary, fixed establishment, or warehouse in a member state, in which case Union OSS can be used for the EU-origin supplies from that establishment.

A side-by-side comparison

Why most UK sellers use Non-Union OSS

After Brexit, the UK is a third country from the EU perspective. A UK-established seller with no EU fixed establishment is therefore eligible for Non-Union OSS for B2C services into the EU but not for Union OSS, because Union OSS requires either EU establishment for the seller or for the supply itself to originate from an EU establishment. Most UK SaaS, online course, digital content, and online membership businesses fall squarely into Non-Union OSS for their EU consumer revenue.

A UK seller with an EU subsidiary or warehouse, for example a UK group with a German subsidiary holding EU inventory, can use Union OSS for the EU subsidiary B2C distance sales of goods into other member states. The choice of OSS scheme follows the entity making the supply rather than the broader group, which means UK-parent groups commonly run Union OSS at the EU subsidiary and Non-Union OSS at the UK parent in parallel.

Goods versus services within OSS

A frequent confusion: Union OSS covers B2C distance sales of goods between EU member states, where the goods are physically moved from one member state to another for a consumer. Non-Union OSS does not cover this; it covers services. For UK sellers, B2C distance sales of physical goods into the EU come from outside the EU and therefore either fit IOSS (low value below €150) or face standard import VAT and customs at the EU border. OSS is not the route for the physical-goods leg of UK to EU sales for a UK-only seller, which is one of the most common misunderstandings of the post-Brexit framework.

Registering for Non-Union OSS

A UK seller chooses one EU member state of registration. The choice is typically driven by language, processing reputation, and intermediary availability. Ireland is a common choice for English-language administration; Luxembourg and the Netherlands are also frequently used. The seller registers directly through the chosen member state OSS portal, providing entity details, the supplies that will be covered, and a contact for tax correspondence. Registration takes a few weeks in practice. Once approved, the seller is issued with an OSS reference, and EU B2C service supplies from the registration date are reported through that scheme.

The quarterly Non-Union OSS return

Non-Union OSS returns are filed quarterly, due by the end of the month following the quarter. The Q1 return covering January to March is due by 30 April. The return is filed through the registration member state portal in that state language, although most portals offer English support. The return is a country-by-country breakdown: for each EU consumer member state, total taxable supplies, the VAT rate applied, and the VAT due. The seller pays the total VAT to the registration member state, which then redistributes country shares to the relevant consumer states.

Union OSS for UK groups with an EU establishment

For a UK-parent group with an EU subsidiary holding EU inventory, Union OSS covers two main supply types from the subsidiary. First, B2C distance sales of goods from the subsidiary EU stock to consumers in other EU member states, replacing the previously needed registrations in each destination country. Second, B2C services (including digital) supplied from the EU subsidiary to EU consumers. The Union OSS registration is held at the subsidiary in its member state of establishment, and the quarterly return is filed there.

For most UK-only groups, the answer is simpler: there is no Union OSS lane open, and Non-Union OSS is the route for the services side. Pan-EU FBA inventory does not by itself create an EU establishment for the UK seller, although it does trigger local VAT registrations in each storage country, which is a different mechanic from OSS and is covered in the Pan-EU FBA piece.

Where Union OSS still requires local registrations

Union OSS does not remove the need for local VAT registrations in member states where the seller stores goods. A seller holding inventory in Germany and France must still hold German and French local VAT registrations for those domestic supplies and intra-community movements, even if it uses Union OSS for distance sales of goods into other member states. The two run in parallel for any seller with EU inventory in multiple member states.

Returns, refunds, and corrections

Refunds and returns on previously declared OSS supplies are corrected on subsequent OSS returns rather than amending the original return. A refund issued in Q2 on a Q1 sale reduces the Q2 country-level total by the refunded amount. Where the correction would create a negative VAT figure in a member state in a quarter, the negative balance is carried forward or claimed back through specific procedures defined in the OSS scheme. Persistent corrections in either direction draw scrutiny, so reconciling refund volumes against original sales each quarter is the standard control.

Audit and record-keeping

OSS records must be kept for ten years from the end of the year in which the supply was made, longer than the UK standard six-year retention. The records cover the destination country, taxable amount, VAT rate, VAT due, payment evidence, and supply detail (description, date, customer location evidence). Audits are typically conducted by the member state of registration but can involve any consumer member state, and the seller is expected to produce records in a usable form to any requesting authority. Storing the records consistently in the e-commerce platform or accounting stack with country-of-supply tagging is the practical approach.

What OSS does not cover

• Imports of physical goods from outside the EU; IOSS handles low-value imports, standard customs procedures handle higher-value consignments.
• Domestic supplies within a member state where the seller has a local VAT registration; those go on the local return, not on OSS.
• B2B supplies, which are typically subject to the reverse charge in the customer member state and do not need OSS coverage.
• Sales to non-EU customers, which fall under the rules of the destination country and are outside OSS scope.
• Excise goods such as alcohol and tobacco, which have their own EU framework.

Choosing between OSS and member-state registrations

A UK seller selling into one or two EU member states only might find direct local registrations in those states simpler than OSS, particularly where local advisers are already engaged and the volume is steady. As the number of consumer member states grows, OSS becomes the materially cheaper and simpler answer: one registration, one quarterly return, one payment, instead of multiple parallel local returns. The break-even point is typically around three or four member states for digital services, lower than that for goods because the local registration administrative overhead is larger.

Can I move from local registrations into OSS later?

Yes, and many sellers do as their EU consumer footprint grows. The transition involves registering for OSS in the chosen registration country, then deregistering from the individual member-state local registrations that OSS now replaces. Local registrations in member states where the seller still holds inventory must stay in place because OSS does not cover those domestic supplies. The transition is straightforward administratively but should be sequenced carefully so no quarter has duplicate reporting on the same supplies.

What if I get the OSS versus IOSS scope wrong?

Reporting goods imports through OSS instead of IOSS, or digital services through IOSS instead of OSS, is one of the more common errors for sellers managing both. The fix is to restate the supplies under the correct scheme on subsequent returns and ensure customs paperwork on goods imports is corrected for the proper IOSS number. Persistent mis-categorisation can prompt the registration member state to question whether the seller is operating the correct scheme at all, so taking the time to map supply types correctly at the outset is materially cheaper than correcting later.