Short answer: IOSS, the Import One Stop Shop, is an EU scheme that lets sellers outside the EU collect VAT at checkout on orders of 150 euros or less, then remit it through a single monthly return instead of registering in every member state. For a US brand, the practical effect is a cleaner checkout: VAT is calculated and shown up front, the parcel clears customs faster because the VAT is already paid, and the customer never gets a surprise bill from the carrier. The catch is that IOSS only covers goods up to 150 euros, it requires an EU-established intermediary for non-EU sellers, and you still need correct HS codes and product values, because the scheme does not fix bad data.
What IOSS actually does
Before IOSS, a US brand shipping a 40 dollar order to France had an ugly choice: register for VAT in France, or ship duties-unpaid and let the customer get hit with VAT plus a carrier handling fee on delivery. IOSS creates a third path. The seller registers once, charges the destination country's VAT rate at checkout, and files one return covering all EU sales. The parcel arrives with VAT prepaid, which customs can verify electronically, so it moves through instead of stopping for collection.
The scheme applies to business-to-consumer sales of goods valued at 150 euros or less, excluding excise goods like alcohol and tobacco. That threshold covers the large majority of DTC orders. Above 150 euros, normal import VAT procedures apply. IOSS is optional, not mandatory, but for brands doing real EU volume it has become the default way to sell without friction.
What changes at checkout
With IOSS, the checkout shows VAT as a line item at the rate of the customer's country, which varies from 17 to 27 percent across the EU. That means your checkout has to know the destination country's rate and apply it per order, not use a single blended EU rate. Most brands handle this through their shipping or tax app, but the rates change occasionally, so the mapping needs maintenance, not a one-time setup.
The customer experience improvement is the real payoff. IOSS orders arrive without the carrier demanding payment at the door, which eliminates the single biggest driver of refused cross-border deliveries. Refusal rates on duties-unpaid parcels run high enough to matter; IOSS removes the surprise entirely. The trade-off is operational: you are now responsible for collecting the right VAT on every order and remitting it monthly, which means checkout accuracy becomes a tax-compliance function.
The intermediary requirement
Non-EU sellers cannot register for IOSS directly. You need an intermediary established in the EU who registers on your behalf and takes on joint liability for the VAT. This is the part brands underestimate. The intermediary is on the hook if you under-collect, so reputable ones audit your product data and checkout setup before taking you on, and they charge a monthly fee plus a per-transaction or percentage cut.
Choosing the intermediary matters more than choosing the scheme. A good one handles the monthly return, keeps you current on rate changes, and flags data problems before they become assessments. A cheap one files whatever numbers you send. Since the liability is shared, vet the intermediary the way you would vet a tax advisor, because that is what they are. The fiscal representative question overlaps here: some brands need both a representative and an IOSS intermediary, and the roles are distinct.
When IOSS is not the answer
IOSS does not cover everything. Orders over 150 euros fall outside it, so brands with high average order values need a parallel process for those shipments. Excise goods are excluded entirely. And IOSS handles VAT only: duties still apply where they apply, and the scheme does nothing about restricted or prohibited goods, which are a separate compliance problem.
It also does not fix bad product data. IOSS parcels still go through customs, and customs still checks that the declared value, description, and HS code are plausible. Brands that treat IOSS as a way to stop thinking about customs paperwork get parcels held anyway. The scheme removes the VAT collection problem at the border; everything else about getting a parcel through customs still applies.
Do I need IOSS if I only get a few EU orders a month?
Probably not yet. At low volume, the intermediary fees can exceed the VAT friction you are solving. Many brands start with duties-unpaid shipping, watch refusal and support-ticket rates, and move to IOSS when EU orders become a real revenue line. The trigger is usually measured pain, not a threshold.
Does IOSS replace the need for an EORI number?
No. IOSS handles VAT collection; the EORI number identifies you to customs as an economic operator. You still need one to move goods through EU customs, and your intermediary will ask for it during onboarding. They solve different halves of the same shipment.
What happens if I collect the wrong VAT rate at checkout?
You owe the difference. The monthly IOSS return is filed per destination country, and under-collection is your liability, shared with your intermediary. Over-collection is a customer-experience problem that eventually becomes a refund problem. Rate tables need to stay current, which is one of the things a good intermediary watches for you.