EORI Number for Slovenia

What is the EORI number in Slovenia?

Slovenia's customs authority, Financial Administration of the Republic of Slovenia (FURS), identifies traders using the EORI (Economic Operators Registration and Identification) number — a single reference quoted on every customs declaration. The number takes the form SI plus a national identifier, shaped like SI12345678, and once issued it is recognised for customs purposes across the whole EU, not just Slovenia. No EORI on file means no import or export can be declared under your name.

Who needs an SI EORI number?

The rule is simple: if you're established in Slovenia and your name appears on a customs declaration as importer or exporter, you need an EORI number first. That applies whether you're a limited company, a sole trader or a partnership, and whether the goods are inbound stock from outside the EU, outbound sales to overseas customers, or cross-border orders placed through an online marketplace. A forwarder or courier can submit the declaration on your behalf, but it will still show your EORI, not theirs.

There is only one place to register: the EU member state where your business is legally established. For a company based in Slovenia, that is Financial Administration of the Republic of Slovenia (FURS). The SI-prefixed EORI it issues is then usable on customs declarations across the entire EU, all 27 member states, so there's no need to apply again elsewhere in the bloc. A non-EU business can likewise obtain its EORI in Slovenia if that's where it first lodges an EU customs declaration.

Great Britain sits outside this EU-wide recognition, so a SI EORI on its own will not clear a UK import. If your Slovenia business imports into the UK in its own name, apply separately to HMRC for a GB EORI — see our UK EORI guide.

How to apply for an EORI number in Slovenia

1. Check whether you already have one. Authorities often assign EORI numbers automatically when a business first interacts with customs. Search old customs correspondence or ask your forwarder, and try our EORI checker with your likely number — the format is usually SI plus your national tax or business identifier.
2. Gather your business details. You will typically need your company registration number, VAT or tax ID, legal form, registered address and contact details of an authorised person.
3. Apply with Financial Administration of the Republic of Slovenia (FURS). Applications go through the official portal — varies with completeness; apply before your first customs declaration. Registration is free of charge; no official authority charges for issuing an EORI.
4. Validate before your first shipment. Once issued, confirm the number is active with our free checker so your first declaration is not rejected over a typo or a not-yet-propagated registration.

Official Slovenia EORI application page

Checking and using your Slovenia EORI number

EU EORI validation (EU EOS) + FURS confirmation. Because the EOS database behind SI numbers is EU-wide, not just Slovenia's own system, counterparties anywhere in the bloc can look your number up too — a routine step many businesses take before trading with a new supplier or customer.

Once active, your EORI appears on every customs document tied to your business: import and export declarations, transit paperwork, safety and security filings, and any customs authorisations you hold. Couriers such as DHL, FedEx and UPS will ask for it before they can clear commercial goods in your name. Keep the exact string handy in your shipping profiles — a single mistyped character is enough to stop a consignment at the border. You can compare your number against the national pattern in our EORI format hub, which covers every country's structure with valid examples.