Finland Y-tunnus Generator
Generator for Finnish Business ID (Yritys- ja yhteisötunnus / Y-tunnus) with Modulo 11 check digit.
Waiting for generation...
About the Yritys- ja yhteisötunnus (Y-tunnus)
The Y-tunnus (Business ID) uniquely identifies all companies, associations, and corporations in Finland.
Jointly managed by the Patent and Registration Office (PRH) and the Tax Administration (Verohallinto).
Finnish Y-tunnus Anatomy & Structure
The Business ID follows the standard format NNNNNNN-T (8 characters):
| Position | Field | Length | Rule & Meaning | Example |
|---|---|---|---|---|
| 1 to 7 | Base Company Number | 7 digits | Sequential number issued by PRH or Tax Administration | 0112038 |
| Separator | Hyphen | 1 char | Standard delimiter | - |
| 8 | Check Digit | 1 digit | Weighted Modulo 11 integrity digit | 9 |
Official Algorithm (Modulo 11 PRH / Vero)
Official formula governed by Finnish Business Information Act (272/2001):
Sum = Σ (d[i] * W[i]) [W = 7, 9, 10, 5, 8, 4, 2]; Remainder = Sum mod 11; DV = Remainder === 0 ? 0 : 11 - Remainder.
- 1. Take the first 7 base digits.
- 2. Multiply each digit by weights [7, 9, 10, 5, 8, 4, 2].
- 3. Sum all multiplication results.
- 4. Divide by 11 to obtain the remainder.
- 5. Remainder 1 is forbidden; remainder 0 gives DV 0; otherwise DV is 11 - remainder.