The tool validates a Czech DIČ or a VAT number from another EU country in two steps. First it instantly checks the format and checksum, for Czechia, Slovakia, Poland, Germany and Austria. Then it checks validity in the EU VIES system and shows the company name and address. It tells legal-entity, individual and special Czech DIČ numbers apart.
First we check the format and checksum (CZ, SK, PL, DE, AT), then validity in the EU VIES system.
Czech DIČ numbers appear in VIES only for registered VAT payers. Not valid in VIES doesn't mean the company doesn't exist.
With the country code (CZ45274649) or without; bare digits are treated as Czech.
The checksum reveals a typo without asking any authority.
For intra-EU trade the number must be valid in VIES, otherwise reverse charge can't be applied.
| Country | Format | Check |
|---|---|---|
| Czechia | CZ + 8 digits (company), 9–10 digits (individual) | IČO mod 11, birth number divisible by 11 |
| Slovakia | SK + 10 digits | divisible by 11 |
| Poland | PL + 10 digits | weighted sum mod 11 |
| Germany | DE + 9 digits | ISO 7064 MOD 11,10 |
| Austria | ATU + 8 digits | Luhn variant |
| Rest of the EU | per country | format, validity via VIES |
Company details by IČO are in the ARES lookup.
IČO identifies a company or sole trader; DIČ is for tax. For legal entities the Czech DIČ is usually CZ plus the IČO, for individuals CZ plus their birth number.
If you invoice a business in another EU country without VAT (reverse charge), you must verify it has a valid VAT number. The VIES check is the European Commission's standard tool for this.
No. VIES lists only entities registered for intra-EU VAT. A Czech DIČ of a non-payer won't be there, even if it's valid.
VIES has regular outages, especially at night and for some countries. The format check always works; try VIES later.
I am still setting up contact. Meanwhile, try the tools that already work.
Contact