Example
The published standard example CHE-109.322.551 passes its check digit. A valid check digit still does not prove that a real business exists or is active.
How the check works
The validator normalizes common spacing and punctuation and checks the official eight-digit Modulo 11 calculation. It does not contact the Swiss UID register and cannot confirm that a number is assigned, active, or VAT-registered.
Frequently asked questions
Does a matching check digit mean the company is active?
No. It only checks number structure and its Modulo 11 check digit. Search the official UID register to confirm assignment and current status.
Does this confirm VAT registration?
No. A MWST, TVA or IVA suffix is not proof of current VAT registration. The supplement can change; verify status in the official register.
Can I check a list?
Yes. Paste one number per line. The local checker accepts up to 100 non-empty lines per batch and can export the results as CSV.
Limits and accuracy
This offline format check does not contact a registry, confirm a business identity, or validate current VAT status. A correct checksum can still belong to an unassigned, inactive, or mistyped number.