Hungarian Adóazonosító jel Validator
Personal tax identification number in Hungary (NAV).
About Hungarian Tax ID
Issued by Nemzeti Adó- és Vámhivatal (NAV).
Required for all employment and tax returns.
Anatomy of Hungarian Adóazonosító jel
Composed of 10 digits:
| Position | Field | Length | Meaning | Example |
|---|---|---|---|---|
| 1 | Prefix | 1 digit | Fixed digit '8' for individuals | 8 |
| 2 to 6 | Days since 1867 | 5 digits | Days elapsed since Jan 1, 1867 | 40111 |
| 7 to 9 | Sequence | 3 digits | Tie-breaker sequence | 123 |
| 10 | Check Digit | 1 digit | Modulo 11 check digit | 4 |
Official Modulo 11 Algorithm (NAV)
Official calculation rule:
Sum = Σ(d[i] * i); Check = Sum mod 11
- 1. Multiply digits by position 1..9.
- 2. Sum the products.
- 3. Check digit is remainder mod 11.
- 4. Remainder 10 is rejected.