Foundation · 2 min
What you need to know
What is a VAT number?
A VAT number is an identifier issued through a jurisdiction’s VAT registration system. Its format and permitted use depend on the issuing authority.
What is a GST registration number?
A GST registration number identifies a registered person or business under a particular GST system. Do not assume the same format or meaning across countries.
When does an ecommerce merchant need a tax ID?
A merchant may need a tax identifier when registration, invoicing, imports, filings or local business activity requires one. The answer depends on entity, market, and transaction model.
Should customer tax IDs be collected at checkout?
Collect it when B2B treatment, invoice requirements or another valid purpose needs it. Make the field conditional and explain why it is requested instead of burdening every shopper.
How should business tax IDs be validated?
Validate format and, where available and appropriate, query the issuing authority or approved service. Keep evidence and handle unavailable services without silently declaring an invalid number valid.
How should tax IDs appear on invoices?
Show required seller and customer identifiers in the prescribed location and format for that invoice type. Do not expose tax IDs on public pages or unrelated documents.
Can tax treatment change for B2B customers?
Yes. A verified business customer may qualify for different place-of-supply, reverse-charge, exemption or documentation treatment. A business name alone is not sufficient evidence.
A quick store check
Test a valid, invalid, and unavailable tax-ID validation result without blocking ordinary consumer checkout.
Foundation · 2 min
Frequently asked questions
Should tax IDs be stored in customer notes?
No. Use a controlled field with validation status, access limits, and retention rules.
Is format validation proof of registration?
No. It only checks shape unless an authoritative status service confirms more.