Why does Liechtenstein use a CHE number?

Liechtenstein shares the Swiss Unternehmens-Identifikationsnummer (UID) system, so its company numbers use the same CHE prefix and the same modulo-11 check-digit algorithm as Switzerland. The two countries operate a common UID register.

How is the UID check digit calculated?

Weight the first 8 digits by 5,4,3,2,7,6,5,4, sum the products, and compute 11 minus the sum modulo 11. If that yields 11 the check digit is 0; if it yields 10 no valid check digit exists; otherwise it is the value itself, which must equal the 9th digit.

What do the MWST or HR suffixes mean?

MWST marks the number as registered for VAT (Mehrwertsteuer) and HR marks it as entered in the commercial register (Handelsregister). These suffixes are labels only and are ignored when computing the check digit.

Does a valid check digit mean the company is VAT-registered?

No. A valid check digit only confirms the UID is internally well-formed. It does not confirm the company is registered for FL MWST (VAT) or active — use the official UID register to verify status.

Is my data sent anywhere?

No. The modulo-11 calculation runs entirely in your browser. The number you enter never leaves your device and no register lookup is made.

Liechtenstein UID Validator

Liechtenstein does not maintain a separate company-number scheme — it shares Switzerland’s Unternehmens-Identifikationsnummer (UID). That means a Liechtenstein company UID looks like CHE-123.456.788 and is validated with the identical modulo-11 check-digit algorithm. This free tool runs that check in your browser, which is what you need when verifying a UID for FL MWST (VAT) or AHR (commercial register) filings.

How it works

The Swiss/Liechtenstein UID carries 9 digits after the CHE prefix, the last of which is a modulo-11 check digit over the first 8:

Drop the CHE prefix and any MWST or HR suffix, leaving 9 digits.
Weight the first 8 digits by 5, 4, 3, 2, 7, 6, 5, 4.
Sum the weighted products and take the remainder modulo 11.
Compute 11 - remainder. If the result is 11, the check digit is 0; if it is 10, no valid check digit exists and the number is invalid; otherwise it is the value itself.
That expected check digit must equal the 9th digit.

Example and notes

For CHE-123.456.788, the first 8 digits 12345678 are weighted and summed, and the algorithm computes the expected 9th digit, comparing it against the 8 supplied. The tool shows the weighted sum and both the expected and actual check digits so the result is fully transparent.

A passing check digit confirms the UID is well-formed but says nothing about whether the company is registered for VAT or currently active — only the official UID register can confirm that. Everything runs locally, so no number is sent anywhere.