Check VAT number format by EU country

A VAT number can look plausible and still use the wrong structure for its country. This checker reads the two-letter prefix, selects the corresponding EU format, and tests the remaining characters against that country's published pattern. It handles the different lengths and required letters used across the EU, while ignoring ordinary spaces, dots, and hyphens. The result is a fast syntax check, not a confirmation that a business exists or that its VAT registration is currently active.

What a VAT format check can tell you

A format check answers a narrow but useful question: could this string be a VAT number issued under the syntax used by the stated EU country? The country prefix controls the test. German numbers, for example, have a different length from Belgian numbers, while Austrian, Dutch, Irish, Spanish, Cypriot, and French formats may require letters in particular positions.

The checker converts letters to uppercase, removes ordinary spaces, periods, and hyphens, and then applies the matching country rule. A string can therefore pass the structural test and still be mistyped, unassigned, expired, or associated with a different organization. Treat a positive result as permission to continue validation, not as proof of registration or identity.

How to enter country prefixes and separators

Enter the complete VAT number, beginning with its two-letter VAT prefix. Most prefixes match the familiar country code, but Greece uses EL for EU VAT purposes, so a Greek entry must begin with EL rather than GR. The checker recognizes the current 27 EU member-state VAT prefixes and returns an input error when the prefix is unknown.

That distinction matters: a recognized country with a badly shaped number produces a normal result with valid set to false, whereas an unknown prefix means there is no country rule to apply. Spaces, full stops, and hyphens are accepted as visual separators and removed before matching, which makes values copied from invoices easier to use. Other punctuation is retained and will normally make the format invalid.

Do not add labels such as VAT, TVA, or MwSt around the number. Although many formats contain only digits after the prefix, several countries require one or more letters. Preserve those letters; replacing them with digits changes the format and should correctly fail the check.

The normalized value in the response shows exactly which compact string was evaluated.

Format validation versus registration verification

Syntax validation belongs near the start of an intake workflow. It is deterministic, immediate, and does not send the supplied identifier to an external registry. Use it while a person is filling in a billing form, when importing supplier records, or before placing VAT numbers into a queue for a slower authoritative check.

A false result gives you a clear reason to ask for a corrected value before making any network request. A true result only says that the characters occupy allowed positions for that prefix. It does not query VIES, a national tax authority, or a company register, and it cannot establish whether the number was issued, is active for cross-border transactions, or belongs to the named customer.

For tax decisions, invoice zero-rating, or compliance evidence, follow a successful format check with the appropriate official registration verification and retain whatever evidence your process requires. This separation also makes failures easier to understand: local syntax errors can be corrected instantly, while registry outages, unavailable member-state services, and genuine inactive registrations remain part of the later verification stage rather than being confused with formatting mistakes.