yritysnumero
Yritysnumero, commonly referred to as the Finnish Y-tunnus (Y-tunnus, business ID), is a unique identifier assigned to companies and other entities that conduct business in Finland. It is used to identify the entity in official records, taxation, invoicing, and interactions with public authorities and financial institutions. The term is often used interchangeably with Y-tunnus in everyday Finnish, and appears in public registers and the Yritys- ja yhteisötunnukset (YTJ) database.
The standard format is seven digits, a hyphen and a check digit (for example 1234567-8). The number
Public authorities and other entities validate the Y-tunnus in numerous services; the Yritys- ja yhteisötunnukset service