Sales Tax & VAT Automation platforms determine, calculate, and file transactional taxes — sales tax, use tax, VAT, and GST — across jurisdictions in real time at the point of transaction. Core capabilities include tax rate lookup and calculation engine integration (API-based), product taxability mapping, exemption certificate management, multi-jurisdiction return preparation and filing, remittance automation, and audit-ready transaction logs. The category spans enterprise indirect tax suites (Vertex, Thomson Reuters ONESOURCE Indirect Tax, Sovos) and cloud-native automation platforms (Avalara, TaxJar, Anrok) that emphasize API speed and SaaS billing integration.