---
id: "fi_ytunnus"
kind: "datatype"
status: "draft"
is_pii: false
categories: ["companies"]
country: ["FI"]
langs: ["fi", "sv"]
quality: 100
url: "http://registry.apicrafter.io/datatype/fi_ytunnus"
---

# Finnish business ID (Y-tunnus) (`fi_ytunnus`)

> **Draft.** Draft records have not been reviewed yet and may be incomplete or wrong; do not treat them as authoritative for legal or compliance decisions.

Y-tunnus (yritys- ja yhteisötunnus, in Swedish FO-nummer), the business identity code of companies and organisations in Finland: seven digits, a hyphen and a weighted check digit.

- Personal data (PII): no
- Categories: Companies/business/organizations (companies)
- Countries: Finland (FI)
- Languages: Finnish (fi), Swedish (sv)
- Classification: identifier

## Detection

Regular expression (Python `re`):

```
^\d{7}-?\d$
```

## Examples

- `2731651-5` — Synthetic number with a valid check digit
- `7162313-3` — Synthetic number with a valid check digit
- `273165157` (invalid example) — One character too many

## Mappings

- orgid: `FI-PRO`
- stdnum: `fi.ytunnus`
- wikidata: `P12980`

## Supported by tools

- `dataprep`
- `pythonstdnum`

## Translations

- fi: Yritys- ja yhteisötunnus (Y-tunnus)
- sv: FO-nummer

## Sources

- wikipedia: <https://fi.wikipedia.org/wiki/Y-tunnus>
- other: <https://arthurdejong.org/python-stdnum/doc/2.2/stdnum.fi.ytunnus.html>
- other: <https://docs.dataprep.ai/user_guide/clean/clean_fi_ytunnus.html>
- wikidata: <https://www.wikidata.org/wiki/Property:P12980>

## Quality

Score 100/100.

JSON: <http://registry.apicrafter.io/api/v1/datatypes/fi_ytunnus.json> · Edit: <https://github.com/apicrafter/metacrafter-registry/edit/main/data/datatypes/FI/companies/fi_ytunnus.yaml>