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Tax IDs identify a business for tax purposes. They appear in two places in the Numeral API:
  • Merchant profiles — stored on a merchant to identify the selling entity for documentation and reporting. Set when creating or updating a merchant via POST /tax/merchants.
  • Calculation requests — passed on customer.tax_ids when the customer type is BUSINESS. Numeral uses the tax ID to determine whether reverse-charge or zero-rate rules apply — for example, a VAT-registered business purchasing across EU borders may owe zero tax rather than the standard rate.
A tax ID has two fields: type (from the table below) and value (the actual number):
An object can hold more than one tax ID — for example, a business registered in both the US and the EU:
For customers, tax_ids is required for BUSINESS type outside the US, and not allowed for CONSUMER type.

Supported Tax ID Types