Finland Y-tunnus Validator
Online validator for Finnish Business ID (Yritys- ja yhteisötunnus / Y-tunnus) with Modulo 11 check.
About the Yritys- ja yhteisötunnus (Y-tunnus)
Finnish business registry identification code.
Supports both hyphenated and non-hyphenated formats.
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 first 7 base digits.
- 2. Multiply by weights [7, 9, 10, 5, 8, 4, 2].
- 3. Compute sum and remainder modulo 11.
- 4. Check validity: remainder 1 is invalid; 0 yields 0; otherwise 11 - remainder.
- 5. Compare with digit 8.