Estonia KMKR nr validator
How the KMKR nr format works
- Format
- EE + 9 digits
- Example
- EE123456789
Things to watch for
- This tool checks the format only; no check-digit validation is performed
^EE[0-9]{9}$Estonia calls its VAT number a KMKR nr (käibemaksukohustuslase number), issued by the Maksu- ja Tolliamet (Estonian Tax and Customs Board) to businesses registered for VAT. The format is uncomplicated by regional standards: “EE” followed by exactly 9 digits, no variation by entity type, no embedded check letters — EE123456789.
Where this gets confusing is regionally, not domestically: Estonia sits between Latvia (11-digit VAT numbers) and Lithuania (9 or 12 digits, depending on whether it’s a company or a branch), so a business checking suppliers across all three Baltic states can easily paste the wrong country’s number into the wrong field, or assume a 9-digit number must be Estonian when it could be a Lithuanian company number instead.
The check, explained
This validator confirms the “EE” prefix and counts exactly 9 digits, entirely in your browser, with no signup and nothing sent to a server. It’s a structural length check — Estonia’s official VAT check-digit calculation isn’t implemented here, so a pass confirms shape, not a verified checksum.
What’s left to verify
A correctly shaped KMKR number isn’t confirmation of an active registration. Businesses deregister, and reissued numbers happen. Use the EU’s VIES lookup or the Maksu- ja Tolliamet directly to confirm a number is currently live before relying on it commercially.
Scope: KMKR format validation only — not registration status, the low-threshold VAT registration rules Estonia applies, or filing obligations.
Content last reviewed 2026-07-07.
KMKR nr FAQ
What does KMKR nr mean?
It's short for käibemaksukohustuslase number — Estonia's VAT registration number, shown on invoices and EU paperwork as 'EE' followed by 9 digits, e.g. EE123456789.
How is an Estonian VAT number different from Latvia's or Lithuania's?
Purely by length and prefix: Estonia's is a flat 9 digits after 'EE', while Latvia's runs to 11 digits and Lithuania's varies between 9 and 12 depending on entity type — easy to mix up if you're checking numbers from all three Baltic states.
Does a correctly formatted KMKR number mean it's active?
No — this tool checks format only. Confirm live registration through Estonia's Maksu- ja Tolliamet (Tax and Customs Board) or the EU's VIES lookup.