Do You Actually Need a Registered IOSS Intermediary?

IOSS gets talked about like it's one simple thing: register, charge VAT at checkout, file one monthly return. In practice it's two very different processes depending on one fact most sellers don't think to check first — where your business is actually established. Get that wrong and you either waste time trying to self-register when you can't, or pay an intermediary for a role you never needed.

What IOSS actually covers, briefly

The Import One-Stop Shop lets sellers charge EU VAT at checkout on goods imported from outside the EU, valued at €150 or less per consignment, and report it through a single monthly return — instead of the buyer getting hit with VAT and a customs handling fee when the parcel arrives. It only applies to physical goods under that threshold; it doesn't cover digital services, goods already stored in the EU, or shipments above €150.

If your business is established in the EU: you don't need an intermediary at all

This is the case most people overthink. If your business is established in an EU member state, you register for IOSS directly with your own country's tax authority. No intermediary, no extra fee for one, no joint-liability arrangement. The single IOSS number then covers your distance sales of imported goods across all 27 member states.

If your business is established outside the EU: you almost certainly do

Here's the part that surprises non-EU sellers: businesses established outside the EU generally cannot register for IOSS on their own. They have to appoint an EU-established intermediary to register and file on their behalf. As of writing, the only exception is businesses established in a country with a VAT mutual assistance agreement with the EU — currently, that's Norway. Everyone else established outside the EU — US, UK, most of Latin America, most of Asia — needs one.

Why this isn't a paperwork formality: "jointly and severally liable"

This is the phrase that explains almost everything else about how IOSS intermediary services are priced and screened. An IOSS intermediary isn't just filing a form on your behalf — they become jointly and severally liable for the VAT you report. If something goes wrong with your filings, the tax authority can pursue the intermediary directly, not just you.

That's why intermediary services aren't a free registration checkbox: providers screen who they'll represent, charge for the exposure they're taking on, and maintain records for years. It's also exactly why some providers explicitly choose not to offer this service at all, even when they handle everything adjacent to it — reconciliation, VAT calculation, filing prep, monitoring an intermediary you've already appointed. Taking on someone else's joint tax liability is a different business than helping them stay compliant, and conflating the two creates a real conflict of interest: the person checking your filings shouldn't also be the one who filed them.

The exception a lot of sellers miss: marketplaces as deemed suppliers

If you sell exclusively through a marketplace like Amazon, Etsy, or a similar platform that's already registered as a "deemed supplier" under IOSS, the marketplace typically handles VAT collection and IOSS reporting for those specific sales itself. You may not need your own IOSS registration — or an intermediary — for sales made through that channel. This changes the moment you also sell through your own website or a platform that isn't a deemed supplier; then those sales fall back to your own IOSS status.

A related 2026 development worth knowing about

Starting April 2026, the UK introduced its own version of this requirement for its VAT IOSS-equivalent scheme: businesses outside the UK and Northern Ireland must use an intermediary to register, with Northern Ireland and Norway-based businesses able to register directly. This is a separate scheme from EU IOSS — don't conflate the two — but if your business ships into both the EU and the UK/Northern Ireland, you're now looking at two parallel intermediary questions, not one.

The question isn't "do I need IOSS." It's "where is my business established, and does that answer require someone else to take on liability for me."

If you're EU-established, this whole question resolves itself — register directly and move on. If you're not, the honest next step is deciding who you want jointly liable for your VAT filings, and being clear-eyed that the person who verifies your numbers and the person who assumes that liability don't have to be — and often shouldn't be — the same one.

Related reading: Cross-Border VAT Services (OSS/IOSS)