What is the format of a Swedish VAT number?

A Swedish VAT number (momsregistreringsnummer) is SE followed by 12 digits. The first 10 digits are the company's organisationsnummer and the last two are always 01.

How is a Swedish VAT number validated?

Confirm the SE prefix, that there are 12 digits, that the last two are 01, and that the first 10 digits pass the Luhn check used for the organisationsnummer.

Why is the suffix always 01?

The two trailing digits are a sequence for the entity's VAT registration. In practice it is 01, because Swedish entities register a single VAT number tied to their organisationsnummer.

Does a valid number mean the company is VAT-registered?

No. A passing check confirms the number is well-formed, not that it is active. Use the EU VIES service to confirm a number is currently registered for intra-EU trade.

Is my VAT number sent anywhere?

No. The validation runs entirely in your browser; the number never leaves your device.

Sweden VAT Number Validator

A Swedish VAT number (momsregistreringsnummer) is the identifier you quote on B2B invoices and intra-EU sales. It is built directly from the company’s organisationsnummer, which makes it easy to validate offline. This free tool checks the structure and the embedded Luhn check digit in your browser.

How it works

The number is SE + 12 digits, decomposed as:

First 10 digits — the company’s organisationsnummer.
Last 2 digits — a registration sequence, in practice 01.

Validation:

Confirm the SE prefix and a total of 12 digits.
Confirm the trailing two digits are 01.
Run the Luhn (mod-10) check over the 10-digit organisationsnummer: double every second digit from the right, reduce values over 9 by subtracting 9, sum, and require the total to be a multiple of 10.

Example

SE556036079301: strip SE, take the first 10 digits 5560360793 as the organisationsnummer, confirm the suffix 01, and run Luhn over 5560360793. If the Luhn total ends in 0, the VAT number is well-formed.

Notes

A passing check confirms internal consistency, not active VAT registration. For live status query the EU VIES portal. Everything here runs on your device.