Free Tax ID Calculator
Learn how tax IDs are calculated. Italian Codice Fiscale algorithm included. 100% in your browser.
How the Italian Codice Fiscale works
- 3 letters from surname (consonants first, then vowels, padded with X)
- 3 letters from name (if 4+ consonants: 1st, 3rd, 4th; else consonants+vowels)
- 2 digits year + 1 letter month (A-T) + 2 digits day (females +40)
- 4-character municipality code (cadastral code)
- 1 check character calculated from the first 15 characters
How the Tax ID Calculator Works
Enter last name, first name, birth date, gender, and the 4-character municipality cadastral code. The tool applies the official Italian Codice Fiscale algorithm: extracting consonants and vowels, encoding birth date with month letters, and computing the check character.
When to Use This Calculator
- Verifying your Italian tax ID code matches your personal data correctly
- Learning how the Codice Fiscale algorithm works for educational purposes
- Validating tax ID formats when developing software for the Italian market
Frequently Asked Questions
Where do I find my municipality code?
Municipality codes (codici catastali) are on the Agenzia delle Entrate website. Common examples: F205 for Milan, H501 for Rome, L219 for Turin.
Is this legally valid for official documents?
This demonstrates the algorithm and verifies structure. For official purposes the Codice Fiscale must be issued by the Agenzia delle Entrate.
Why does the day change for females?
The algorithm adds 40 to the birth day for females. A woman born on the 15th has 55 in the day field, encoding gender within the date portion.
All calculations happen in your browser. No data is sent to any server.
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