Tax ID Validation — Tax ID validation checks VAT numbers and other tax registrations against government registries in real time. It gates B2B exemptions and reverse-charge treatment, feeding verified status into the tax engine so invoices and e-invoicing filings hold up under audit.
Tax ID Validation lives in the Design & Setup phase of Define What You Sell — the stage where you design the catalog, pricing, and rules of the offer. In the corpus tool index this phase maps to the CPQ and Billingcategories.