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Check company IDs and EU VAT numbers
Check Czech and Slovak IČO checksums and EU VAT number formats.
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Company ID in Czechia and Slovakia
View companyEU VAT number format
How it works
Enter all eight IČO digits, including leading zeros. The check uses mod 11. Slovak VAT numbers have SK plus ten digits and are not derived from IČO. For Czech legal entities CZ + IČO is only a candidate VAT number. Czech personal VAT IDs are checked for format only; no personal information is derived. Other EU countries receive format checks only. Confirm registration separately in VIES.
Inputs stay in your browser. Calculations do not establish company existence, tax registration, account existence or recipient identity.
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