Late EU VAT Registration 2026 — Penalties & Back-Taxes

If you have just realised that your business has an EU VAT obligation you have not been meeting, you are likely feeling a mix of anxiety and confusion.

Perhaps you did not know the Non-Union OSS threshold is €0 for digital sellers outside the EU, or you have been shipping goods to the EU without understanding how IOSS works.

The most important thing to know is: this is fixable. Tax authorities across the EU deal with late registrations every day. There are processes to follow and potentially penalties to pay, but taking the lead via voluntary disclosure is always viewed more favourably than being discovered in an audit.

Understanding Your Position

You had an obligation to register, you did not, and now you know. You cannot change the past, but you can control how you handle the fix.

In tax compliance, there is a significant distinction between deliberate evasion and a genuine mistake. If you come forward voluntarily to regularise your position, you are treated as a compliant business that made an error.

IOSS Late Registration — Physical Goods

If you sell physical goods to EU consumers and have not registered for IOSS, your situation is often less severe than for digital sellers.

The backup mechanism: when you ship goods without an IOSS number, the courier typically collects VAT from the customer at the door (DAP — Delivered at Place). In this case, the VAT has already been paid to the EU tax authority — it was just paid by your customer rather than by you at checkout.

What to do now:

Back-filing is rarely needed. You do not typically back-file IOSS returns because IOSS is a collection method. If you did not collect it, you did not use the scheme.
Register now. Appoint an intermediary and get your IOSS number to fix the customer experience going forward.
No back-liability. Since VAT was collected at the border, there is generally no unpaid tax to settle for past sales.

Non-Union OSS Late Registration — Digital Services

This is the more serious scenario. If you sell digital services (SaaS, ebooks, software, online courses) to EU consumers, there is no customs border to collect the tax. If you did not charge it, the tax is unpaid.

What happens next:

The registration date. When you register for Non-Union OSS (most commonly in Ireland for English-speaking businesses), you are asked for the date your taxable activities began. You should be honest.
Back-filing. Once registered, you will be required to file returns for the past quarters you missed.
Payment. You will have to pay the total VAT you should have collected from your customers. Since you likely did not charge them, this comes out of your business profits.

How to Calculate What You Owe

Before you register, you need to know the scale of the problem.

Export your transaction history. Pull every sale to an EU customer since the date you should have registered.
Identify the customer’s country. Group sales by the customer’s country using their billing address, IP address, or payment location.
Apply historical rates. Do not use today’s VAT rates. You must use the rate that was active at the time of the sale. If a country raised its VAT rate during the period, apply the old rate to older sales.
Calculate the owed VAT. Total Sales (Gross) ÷ (1 + VAT Rate).
- Example: You sold a €100 ebook to a French customer (20% VAT). The VAT owed is €16.67 (€100 ÷ 1.20).

The Voluntary Disclosure Approach

You have two options:

Wait to be discovered. Risk an audit, higher penalties, and potentially being banned from EU trading.
Voluntary disclosure. Register now, tell the tax authority you missed the deadline, and offer to pay.

Tax authorities in Ireland and the Netherlands in particular have formal voluntary disclosure schemes. If you come forward before they contact you, penalties are frequently waived or significantly reduced. They want the tax money and a compliant seller in the system — not a protracted enforcement action against a small business.

Penalty Structures

Penalties vary by the member state where you register (the “Member State of Identification”) and by the destination countries.

Ireland (Revenue.ie): Generally pragmatic. Voluntary disclosure typically limits penalties to interest on the late payment — currently around 8% per annum.
Germany: Known for being strict. May issue late filing surcharges as a percentage of tax owed.
France: Operates a “right to error” (droit à l’erreur). First mistake fixed voluntarily = very lenient treatment.

A 10% penalty on a genuine mistake is a manageable cost. Being caught in an audit can lead to penalties of 50–100% of tax owed, plus interest. The difference between voluntary disclosure and being found is large.

Getting Professional Help

If your back-liability is significant — generally upwards of €5,000 in unpaid VAT — do not handle this alone.

A VAT specialist who understands EU cross-border rules is worth the fee. They can manage the disclosure to the tax authority and often negotiate the removal of penalties.

Red flags when speaking to accountants:

“Don’t worry about it, they can’t catch you from outside the EU.” (They can, via DAC7 data sharing.)
“Just register from today and ignore the past.” This is a red flag on your registration that can trigger an immediate audit.

What to Do This Week

Audit. Run your sales reports. Determine whether you owe tax (digital) or had a poor customer experience (physical goods).
Quantify. Calculate the rough total you owe across the EU.
Appoint an intermediary if needed. If IOSS applies, choose an intermediary now.
Register. Submit your application for Non-Union OSS or IOSS.
Declare. Once you have portal access, file the back-returns as instructed by your accountant or the tax portal.
Pay. Clear the balance.

Going Forward

Once you are in the system, stay there.

Set quarterly reminders. OSS returns are quarterly (April, July, October, January).
Keep records. EU law requires VAT records to be kept for 10 years.

Errors are common in cross-border trade. What matters is how quickly and professionally you fix them.

Selling from a Specific Country?

The processes above apply to any non-EU seller regularising an EU VAT position. Some countries have specific nuances:

United Kingdom — HMRC is not involved in EU VAT voluntary disclosures (they are separate systems). EU authorities contact you directly. There are also specific considerations around how late IOSS registration interacts with UK VAT obligations for physical goods sellers. See the UK guide to late EU VAT registration.
United States — guide coming soon
Australia — guide coming soon