OneSource Tax

ONESOURCE is Thomson Reuters' corporate tax software suite covering direct tax, indirect tax, trade, and statutory reporting. Its income tax compliance module prepares and e-files federal, state, local, and international corporate returns, while its provision module calculates tax estimates for financial reporting with drill-down review. The platform also spans transfer pricing, global trade management, and workflow tools for tax departments coordinating across jurisdictions. It serves corporate tax and finance teams at organizations ranging from mid-sized companies to large multinationals, with Thomson Reuters citing tens of thousands of business users worldwide. Its central value is automating compliance calculations and filings that would otherwise be assembled manually in spreadsheets across many entities and jurisdictions.