A small change has appeared on every company card in the Estonian e-Business Register: a new line labelled EUID, directly under the registry code. Here is what it is, why it exists and whether you need to do anything about it, with our own company as the example.
Quick answer
Every company card in the Estonian e-Business Register now shows an EUID number, the European Unique Identifier. For Eesti Firma OÜ it reads EEARIREG.14164797: country code, register code and the company’s own registry code in a single string. The EUID is assigned automatically, costs nothing and does not replace the registry code. Its job is to identify an Estonian company unambiguously when EU business registers exchange data through the Business Registers Interconnection System (BRIS). It has nothing to do with the EU Digital Identity Wallet for individuals.
Where to find the EUID on an Estonian company card
Search for any company at ariregister.rik.ee and open the General information (Üldinfo) block. A new line labelled EUID now sits directly under the registry code. Our own company as the EUID example:
| Field | Eesti Firma OÜ |
|---|---|
| Registry code (registrikood) | 14164797 |
| EUID | EEARIREG.14164797 |
| Legal form | Private limited company (osaühing) |
| Status | Entered in the register |
Nothing about the company’s legal position has changed, and there is nothing to apply for. The Centre of Registers and Information Systems (RIK) generates the identifier from data the register already holds.
EUID format: how to read the number
The EUID code follows one fixed structure across the EU and EEA. Reading EEARIREG.14164797 from left to right:
- EE — the ISO two-letter country code for Estonia
- ARIREG — the identifier of the Estonian Business Register (äriregister)
- 14164797 — the registry code, separated from the register identifier by a full stop
The EU format also allows an optional check digit at the end; the Estonian identifier does not use one. A German GmbH or a Latvian SIA carries an identifier of the same shape, each pointing back to its own national register and its own domestic number.
The legal basis: EU Company Law Directive and BRIS
The European Unique Identifier is required by the EU Company Law Directive. Article 16 of Directive (EU) 2017/1132 requires every member state to give its companies an EUID so that they can be identified without ambiguity when registers communicate. The technical format is set out in Commission Implementing Regulation (EU) 2021/1042, which sets the technical rules for the register interconnection system.
That system is BRIS, the Business Registers Interconnection System. It links the business registers of all EU member states plus Iceland, Liechtenstein and Norway to a central European platform and provides one public search point on the European e-Justice Portal. Searching is free, although some countries charge for individual documents. The details shown come straight from the national registers; the central platform keeps only a search index.
EUID vs registry code: why a European identifier is needed
National registry codes are only unique within their own country. An eight-digit number that means Eesti Firma OÜ in Estonia may exist in another country’s register, attached to an entirely different company. When registers talk to each other electronically, they need a key that cannot be misread, so the EUID embeds the country and the register in the number itself. The registry code identifies the company in Estonia; the EUID identifies it across Europe.
Registers use the EUID in every structured message they exchange through BRIS: when a company opens or closes a branch in another member state; when a parent company’s details change, or it enters liquidation or insolvency, and the branch register must be informed; and when a cross-border merger, division or conversion moves a company from one register to another.
What the EUID means in practice for an Estonian company
For day-to-day business inside Estonia the EUID changes nothing. The registry code remains the number for contracts, invoices, tax filings and bank paperwork, and the Directive itself says companies need not print the EUID on letterheads or order forms.
The identifier becomes useful for cross-border company identification:
- Verification by foreign partners and banks. A counterparty elsewhere in the EU can look your company up on the e-Justice Portal and see official register data without needing to navigate the Estonian register or read Estonian.
- Branches abroad. When an Estonian company registers a branch in another member state, the parent’s EUID is the reference that links the two registers.
- Cross-border restructuring. Mergers, divisions and conversions across borders are processed between registers using the EUID.
One practical note: the European Business Register (EBR) look-up has been withdrawn from the e-Business Register following the closure of the EBR platform. BRIS on the e-Justice Portal is now the standard route for checking companies across EU registers, and the EUID number is the reference it runs on.
Keeping your company card in order
The EUID gives foreign parties a direct route to your Estonian register entry, so what they see is exactly what the card shows: board members, registered address, contact person, share capital and annual reports. Any out-of-date detail is now visible EU-wide, not just in Estonia.
Eesti Firma maintains company records and files register applications for clients, from initial company formation in Estonia to a registered legal address and ongoing accounting. If you are not sure what your company card shows to the outside world, we can review it with you.
Frequently asked questions
EUID stands for European Unique Identifier. It is a company identification code made up of a country code, a business register identifier and the company’s national registration number, used so that EU and EEA business registers can identify a company without ambiguity.
No. The Estonian Business Register assigns it automatically to every registered company and displays it on the company card.
For an Estonian company, open it at ariregister.rik.ee and look at the General information section, where the EUID is shown directly below the registry code. For a company elsewhere in Europe, check its national register or search for it through BRIS on the European e-Justice Portal.
No. The registry code remains the main identifier in Estonia. The EUID is an additional, EU-wide reference built from the same number.
No. The EU Digital Identity Wallet (EUDI) is a personal identification scheme for individuals. The EUID is a company identifier issued by business registers; beyond the similar acronym, the two have nothing in common.
No. A VAT number is issued by the Estonian Tax and Customs Board for VAT purposes only. The EUID is issued by the business register and identifies the company for register-to-register communication.
Yes. On the European e-Justice Portal you search by company name or domestic registration number, and basic register data is shown free of charge, just as it is on the Estonian register itself.
