More than 170,000 businesses were registered under the EU’s OSS and IOSS schemes by the end of 2024, and those systems moved over €33 billion in VAT that year alone (European Commission, 2025). If you sell into the EU from outside its borders, IOSS is the mechanism that decides whether your customer pays VAT at checkout or gets an unpleasant surprise from a courier at the door. This guide walks through who needs to register, how the process actually works, and what happens if you skip it.
Key Takeaways
- IOSS lets non-EU sellers collect VAT at checkout on consignments worth €150 or less, instead of leaving customers to pay it on delivery (European Commission, 2025).
- Non-EU sellers generally cannot register for IOSS directly; they need an EU-established intermediary to register and file on their behalf (Hellotax, 2026).
- Sellers who trade only through marketplaces like Amazon or Etsy usually don’t need their own IOSS number, since the platform is deemed the supplier and collects VAT itself.
- Missing three consecutive IOSS filing periods gets a business struck off the scheme with a two-year lockout before it can re-register (VAT Digital, 2026).
- Since 1 July 2026, IOSS-registered sellers also collect a flat 3 euro customs duty per item type on orders under €150 - a new responsibility that non-IOSS sellers currently don’t share for the same order value (Gerlach Customs, 2026).
What Is IOSS, and Who Actually Needs to Register?
IOSS, the Import One-Stop Shop, is the EU system that lets sellers outside the bloc collect import VAT at the moment of sale rather than at the border, covering consignments with an intrinsic value of €150 or less (Hellotax, 2026). It exists because, since 2021, every parcel entering the EU owes VAT from the first euro, with no exemption for low-value orders.
Intrinsic value means the price of the goods themselves at the time of sale, and shipping or insurance can be excluded from that figure only if they’re itemized separately on the invoice (VAT Digital, 2026). Anything priced above €150, or shipments of excise goods like alcohol and tobacco, falls outside IOSS entirely and follows the standard import process instead.
Sellers often assume IOSS is optional paperwork they can put off. It isn’t a legal requirement to register, but skipping it doesn’t remove the VAT obligation, it just shifts who collects it and when. The tax gets paid either way; the only question is whether your customer pays it cleanly at checkout or gets stopped by a courier holding their parcel hostage for VAT plus a handling fee.
For the mechanics of what happens to a parcel once it crosses into the EU, see the 150 euro import threshold guide, which covers the buyer’s side of this same system.
Can You Register for IOSS Directly, or Do You Need an Intermediary?
Sellers established outside the EU generally cannot register for IOSS on their own; they need to appoint an EU-established intermediary to handle registration and ongoing compliance (Hellotax, 2026). That intermediary registers your business, obtains your IOSS VAT identification number, files your monthly returns, pays over the VAT you’ve collected, and keeps the records tax authorities expect to see.
The rule is tightening, not loosening. UK-based sellers shipping to the EU now face mandatory intermediary registration starting April 1, 2026, closing a gap that had let some UK businesses operate without one (VATupdate, 2026). If your business sits outside the EU and Northern Ireland, assume you’ll need an intermediary rather than hoping you’re an exception.
EU-established sellers are the one group that can skip this step. If your company has a genuine establishment inside the EU, you can register for IOSS directly through your home country’s tax portal, no intermediary required.
[INTERNAL-LINK: getting an EORI number as a non-EU seller → step-by-step registration guide]
What Are the Actual Steps to Register for IOSS?
Registration runs through your chosen intermediary rather than a form you fill out yourself: you supply your legal business name, address, and EORI number, the intermediary registers your business with its home tax authority, and you receive a unique IOSS VAT identification number in return. That number then has to appear on every customs declaration your parcels carry.
IOSS itself accounts for a smaller slice of that revenue than the Union OSS scheme, which covers intra-EU distance sales rather than imports. That’s expected: Import OSS only applies to non-EU sellers shipping consignments under €150, a narrower base than the domestic EU sales the Union OSS scheme covers.
Isn’t it odd that a scheme built specifically for imports collects less than the one covering EU-to-EU sales? It reflects the customer base, not the compliance burden. Far more sellers trade within the EU than ship into it from outside, so Union OSS naturally carries more volume even though Import OSS is the scheme most relevant to a non-EU seller reading this guide.
Also read: How customs valuation works → guide on declared value and duty calculation
Do You Need Your Own IOSS Number If You Sell Through Amazon or Etsy?
Usually not. Marketplaces that facilitate the sale are treated as the “deemed supplier” for VAT purposes on consignments up to €150, which means the platform collects and remits the VAT rather than the individual seller. If every order you fill runs through a marketplace like Amazon, Etsy, or a similar platform, that platform’s own IOSS registration already covers your shipments.
The deemed supplier rule shifts, but doesn’t remove, the compliance burden. Sellers still need to confirm the marketplace is actually collecting VAT correctly on their listings and hasn’t misclassified a product category, since an error on the platform’s end can still leave the seller fielding customer complaints about surprise charges.
Cross-referencing the 93% IOSS coverage rate on EU e-commerce imports with how few individual sellers hold their own IOSS number suggests most of that coverage comes from a small number of large marketplaces registering once and covering thousands of third-party sellers underneath them, not from mass individual registration.
Sellers running their own storefront, through Shopify or a similar platform without built-in marketplace facilitator status, don’t get this coverage automatically and need to register in their own name.
What Happens After You’re Registered?
Once registered, you file an IOSS return every month, even if it’s a nil return for a month with no EU sales, and the deadline falls at the end of the month following the reporting period (VAT Digital, 2026). Every customs declaration on every parcel needs your IOSS VAT identification number attached, and supporting records have to be kept for 10 years from the end of the year the sale happened in.
That 93% figure is worth sitting with if you’re still on the 7% side of it. Most of your competitors’ EU customers already see VAT baked into the price they click “buy” on. If your checkout doesn’t do the same, you’re one of a shrinking minority whose customers get an unexpected bill after the fact, which shows up in return rates and refused deliveries far more than in one-star reviews.
For the fuller mechanics of how VAT stacks with customs duty once a parcel is past the IOSS stage, see how customs valuation and duty calculation actually works.
What Does It Cost to Register and Stay Compliant?
Intermediary pricing varies widely: some charge a flat monthly subscription that bundles in a set number of orders, others charge roughly 1% of the value declared through IOSS each month, and one-time registration fees separately from ongoing service run in the range of €99. There’s no single “IOSS costs €X” answer; the right structure depends on order volume.
A seller shipping a few hundred low-value parcels a month typically fits comfortably inside a flat subscription tier, where the marginal cost per order is small. A seller with highly seasonal volume, heavy in Q4 and thin the rest of the year, often comes out ahead on a percentage-of-value or per-order model instead, since a flat monthly fee gets expensive during slow months.
| Registered for IOSS | Not registered | |
|---|---|---|
| VAT collection point | Checkout, included in price | Courier, on delivery |
| Customer sees | Final price upfront (plus the new flat duty below) | VAT bill at the door |
| Customs duty, orders under €150 | Flat €3 per item type, since 1 July 2026 | None - still outside the new rule’s scope, for now |
| Typical handling fee, orders under €150 | None | None |
| Ongoing seller cost | Intermediary fee (flat, %, or per-order) | None directly, but higher refusal/return rates |
| Compliance burden | Monthly filing, 10-year records | None (no registration) |
The row that matters most for conversion still isn’t the seller’s cost line, it’s what the customer sees. A courier collecting VAT on delivery, with no warning at checkout, remains the kind of unexpected charge that gets a parcel refused at the door - the new flat duty on IOSS orders is small enough (a few euros, not a surprise VAT bill) that it hasn’t changed that calculus, but it does mean “IOSS-registered” no longer means “nothing else to collect.”
[INTERNAL-LINK: total landed cost calculator → interactive tool for import cost estimates]
What Happens If You Miss a Filing Deadline?
The Member State where you’re registered sends an automatic reminder on the 10th day after a missed due date, and further non-payment escalates from there (VAT Digital, 2026). One late return is recoverable. A pattern isn’t.
Miss three consecutive return periods without settling up, and the tax authority can strike your business off the IOSS scheme entirely, with a two-year lockout before you’re eligible to register again (VAT Digital, 2026). During that lockout, every parcel you ship reverts to standard import treatment: no VAT collected at checkout, courier collection at the border instead, and the exact customer friction IOSS was built to avoid.
The two-year exclusion is longer than most sellers expect for what can be, in practice, a bookkeeping failure rather than deliberate non-compliance. A reliable intermediary matters less for the registration paperwork itself and more for making sure a missed reminder email doesn’t turn into a two-year competitive disadvantage against sellers who never lapsed.
[INTERNAL-LINK: how to appeal a customs valuation decision → dispute and refund process guide]
Frequently Asked Questions
Does every online seller need to register for IOSS?
No. Sellers trading only through a marketplace like Amazon or Etsy are typically covered by the platform’s own registration under the deemed supplier rule. Sellers running an independent storefront and shipping consignments of €150 or less into the EU are the ones who need their own registration.
What’s the difference between OSS and IOSS?
OSS (Union and non-Union schemes) covers VAT on sales already inside the EU or digital services sold to EU consumers, while IOSS specifically covers imported goods valued at €150 or less. Together they moved over €33 billion in VAT in 2024 (European Commission, 2025).
Can a UK-based seller register for and use IOSS?
Yes, but from April 1, 2026, UK sellers shipping into the EU need to appoint an EU-established intermediary to do so, the same requirement that already applied to other non-EU sellers (VATupdate, 2026).
What happens to orders over €150? Does IOSS cover them?
No. IOSS only applies to consignments with an intrinsic value of €150 or less. Orders above that threshold follow the standard import process: customs duty applies, VAT is calculated on the combined value, and a courier handling fee is typically charged at delivery.
How long does IOSS registration actually take?
Timelines vary by intermediary and home tax authority, but most providers quote registration turnaround in days to a few weeks once you’ve supplied your business details and EORI number. The bigger time cost is usually choosing an intermediary, not the registration itself.
The Bottom Line
IOSS registration isn’t legally mandatory, but the VAT obligation it addresses doesn’t go away if you skip it, it just moves the collection point from your checkout to your customer’s doorstep. Non-EU sellers need an EU-established intermediary to register, marketplace sellers are usually covered already, and the ongoing burden is a monthly filing and a decade of recordkeeping. Since 1 July 2026, registered sellers also carry the new flat 3 euro per-item customs duty on sub-150 euro orders - a small addition, but a real one, and worth factoring into pricing and margin conversations, not just the compliance checklist. With 93% of EU e-commerce imports already collecting VAT this way, the question for most sellers isn’t whether to register, but how long they can afford to be part of the shrinking minority that doesn’t.
Also read: how tariffs affect small business pricing, a guide to managing margin compression for importers.