ONESOURCE Determination vs Vatstack

ONESOURCE Determination automates calculations for sales tax, use tax, GST, VAT, and excise tax. The web-based product connects with ERP, financial, billing, e-commerce, point-of-sale, and payment systems through pre-built or custom integrations. It supplies global tax rates, rules, and calculations in real time, with cloud synchronization to support high transaction volumes. Deployment includes a cloud-based indirect-tax engine and an edge-computing option. Determination Anywhere supports business-specific security and data-residency requirements. Tax content covers specialized jurisdictions and industries, with industry offerings for oil and gas, retail, manufacturing, and technology. Configuration features include company structures, global calculations, and tax-return streamlining. Thomson Reuters says its automated calculations and certified processes aim to reduce audit-triggering mistakes; the processes are backed by SSAE 18 and ISAE 3402 certifications. Pricing is on request, and a free demo can be requested.

Vatstack is a VAT API for businesses selling telecommunications, broadcasting and electronic services to customers around the world. It provides rates for domestic and cross-border sales, updating them when government changes take effect. The API can calculate VAT-inclusive or VAT-exclusive prices, determine customer location from an IP address or billing address, verify VAT numbers for exemption, and adjust rates for some digital products such as ebooks. Real-time VAT and GST checks cover the 27 EU member states, Australia, Norway, Singapore, Switzerland and the United Kingdom. EU and UK checks include a consultation number, and validation records are stored in the cloud and replicated between EU data centers on AWS. Users can import a CSV for bulk checks. Vatstack compiles VAT OSS and EC Sales List reports using European Central Bank exchange rates, and integrates with Stripe to sync invoices, location evidence and tax IDs and to adjust reports after refunds. A free plan is available; paid plans start at $15/mo.