How to validate a Swiss UID number online?

Enter the UID number (starting with CHE), we check format and checksum, then verify against official sources via our API.

Is UID verification free?

Format and checksum validation are free; server lookups may be rate-limited.

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Validate Swiss UID Number Online

Quickly and accurately validate UID numbers (UID-Nummer/No IDE/IDI/NIE) for businesses across Switzerland.

Tax ID Number:

Frequently Asked Questions

What is the Swiss UID number?

The UID (Unternehmens-Identifikationsnummer) is known by different names in Switzerland's official languages:
• German: UID-Nummer (Unternehmens-Identifikationsnummer)
• French: No IDE (Numéro d'identification des entreprises)
• Italian: IDI (Numero d'identificazione delle imprese)
• Romansh: NIE (Numer d'identificaziun da las interpresas)
It consists of 'CHE' followed by 9 digits and is used for tax and business registration purposes.

How can I validate a Swiss UID number online?

You can validate any Swiss UID number using Lookuptax's free checker. Enter the number (starting with CHE) to confirm validity and retrieve business details instantly.

Is UID validation mandatory for invoices?

Yes. For B2B transactions, validating the buyer's UID ensures accurate invoicing, compliance with Swiss tax law, and prevents tax filing errors.

Can I integrate UID validation into my billing system?

Yes. Lookuptax provides a UID validation API that can be integrated with invoicing, ERP, or billing platforms to automate compliance.

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