Onesource determination

Global tax determination software

Calculate accurate sales and use tax, GST, VAT, and excise tax

What can ONESOURCE Determination do for you?

Calculating, collecting, and reporting indirect tax gets more complicated as your business grows. You need to accurately report on sales and use tax, goods and services tax (GST), value-added tax (VAT), and excise tax – no matter how often the rates or rules change. Our global tax determination software allows companies to automate tax calculations on transactions without the headache of maintaining an in-house solution. 65% of Fortune 500 companies and multinational corporations have relied on our market-leading tax engine for more than a decade. Now you can also harness the power of edge computing with our latest deployment option, ONESOURCE Determination Anywhere, for optimal performance and control. 


See how it works

Have questions about indirect tax automation? Thomson Reuters has answers. Learn how ONESOURCE Determination simplifies configuring a company structure, setting up tax calculations for global jurisdictions, streamlining tax returns, and more.

We wanted to use a simple system, a single set of rules that the tax department could control — not IT and not the end user — to make sure that our tax liability was accurate.

What you get with our global tax determination software

Automate tax determination

Automate the calculation of taxes globally with an automated solution for sales tax, use tax, GST, VAT, and excise tax.

Integrate to business systems

Connect to ERP, financial, billing, e-commerce, POS or payment systems through pre-built and custom integrations.

Trust our tax

Reduce the risk of audit-triggering mistakes, using our in-house expertise backed by SSAE 18 and ISAE 3402 certified processes.

Customize tax rules and policies

Ensure global tax liability needs are met by creating custom tax rules and policies no matter where business takes you across the globe.

Rely on a single source of truth

Manage tax and reporting from a single source across all business systems

Improve tax engine performance

Maximize control, performance, and reliability with our new edge computing deployment, ONESOURCE Determination Anywhere

Powerful indirect tax integrations to ERP and financial applications

With Thomson Reuters ONESOURCE Determination, keep using the business systems you know and love, while improving the way you manage global transaction tax.

  • Make global tax calculations and compliance consistent across the business.   Seamlessly integrate with existing business platforms and applications including ERP, CRM, e-commerce, POS, or other financial systems.
  • Use standard APIs to connect ONESOURCE Determination to business workflows, applications, or platforms  without a complex software implementation.
  • Tailor an integration to a specific workflow or processes without disrupting the business.

Visit our integrations directory for more information.

Ready to start a conversation?

See why Fortune 500 companies have relied on ONESOURCE Determination for more than a decade. Drop us a line and someone from our sales team will walk you through a personalized demo.

Or you can call a regional representative at

+1 888 885 0206