Automate indirect tax and e-invoicing with ONESOURCE

ONESOURCE is Thomson Reuters' integrated tax and trade technology platform, designed to help businesses manage their tax obligations across the full compliance lifecycle — from the moment a transaction occurs through to filing and reporting.

Rather than relying on multiple disconnected point solutions, ONESOURCE brings together a connected suite of products giving your tax team a single platform to manage compliance across countries and jurisdictions.

The ONESOURCE Indirect Tax suite includes:

ONESOURCE Determination automates the real-time calculation of indirect tax — including VAT, GST, and sales tax — for both accounts receivable and accounts payable transactions. It applies country-specific, product-specific, and customer-specific rules to ensure the right tax rate is applied to every transaction, almost instantly.

ONESOURCE Pagero manages the end-to-end exchange of e-invoices and business documents across global networks. It handles format conversion, routing through government platforms and Peppol-connected networks, and local validation — ensuring invoices are compliant and delivered correctly, regardless of country or mandate.

ONESOURCE Reconciliations automates the comparison of e-invoice data and VAT/GST return data to identify and resolve discrepancies. It classifies line-level differences, prioritises those that affect return boxes, and supports audit readiness — all without manual data extraction.

ONESOURCE Indirect Compliance AI brings AI-powered automation to the indirect tax compliance process, combining country-specific regulatory content with intelligent workflows and resolutions to streamline return preparation, reduce manual effort, and keep pace with regulatory change across jurisdictions.

AI is embedded across the ONESOURCE platform, helping tax teams reduce manual effort, improve accuracy, and keep pace with a constantly evolving regulatory landscape.

Key ways AI is used across the suite:

• Smarter compliance workflows — ONESOURCE Indirect Compliance AI uses agentic AI to automate the most time-consuming parts of the compliance process — from data validation through to return preparation — so your team can focus on higher-value work.
• Trusted, grounded content — Unlike generic AI tools, ONESOURCE combines its AI capabilities with Thomson Reuters' expert-maintained regulatory content, covering tax rules, rates, and filing requirements globally. This grounds the AI in verified, up-to-date information — reducing the risk of errors and hallucinations.

As AI continues to evolve, Thomson Reuters is committed to embedding it responsibly across ONESOURCE — pairing technology with the trusted content and expertise that compliance teams depend on.

Risk is reduced by validating data upfront, rather than correcting issues after submission. ONESOURCE helps by:

• Applying country-specific rules before invoices are sent
• Ensuring invoices are routed through approved channels
• Providing clear visibility into submission and acceptance status
• Maintaining audit-ready records throughout the process

This significantly reduces rejected invoices, delayed payments, and downstream compliance issues.

ONESOURCE is designed to integrate with any ERP system, invoice workflow tool, or tax technology platform. Integration options include:

• Pre-built connectors for major ERP systems
• API integration for real-time, transactional connectivity
• SFTP for batch data exchange

This flexibility means you can connect ONESOURCE to your existing technology stack without significant re-engineering.

E-invoicing models vary widely across countries, and ONESOURCE manages this complexity through a single connectivity layer. This includes:

• Format management and automatic conversion between standards
• Integration with Peppol and other exchange networks
• Connectivity to government platforms where clearance or reporting is required
• Ongoing updates as formats and validation rules change

Businesses do not need to build or maintain separate integrations for each country — ONESOURCE handles this centrally.

E-invoicing mandates increasingly require structured, machine-readable invoices, submission through approved networks or government platforms, and near-real-time or continuous reporting.

ONESOURCE supports this by:

• Accepting invoices in virtually any format and automatically converting them to the recipient's required standard (e.g. EN 16931-based formats)
• Managing format conversions seamlessly, eliminating manual intervention or the need to maintain multiple integration points
• Routing invoices through the correct government or certified channels
• Applying local validation rules before submission
• Tracking acceptance, rejection, and reporting status throughout

This helps businesses stay compliant as mandates evolve, without having to redesign processes country by country.

ONESOURCE is supported by our teams and services across the full solution lifecycle, including:

• Structured implementation methodologies to get you live efficiently
• Ongoing automated regulatory content updates as rules and rates change
• Continuous monitoring of mandate changes and format updates
• Operational customer support for live environments

This means compliance is maintained not just at go-live, but as regulations continue to evolve.

While ERPs cover a broad range of business functions, a dedicated tax engine is built specifically to handle the complexities of indirect tax for the supply of goods and services globally. Key differences include:

• Product tax coding and real-time rate lookup tailored for indirect tax
• International indirect tax compliance, covering rules across multiple jurisdictions
• Global tax content that is managed and maintained within the engine, so applicable legislative changes are automatically applied to transactions

This specialist focus means greater accuracy, less manual maintenance, and lower compliance risk than relying on ERP tax functionality alone.

Automating the comparison of e-invoice and VAT return data at line level eliminates manual groundwork. Discrepancies are detected, classified, and prioritised automatically — so instead of spending time finding the problem, your team can focus on resolving it.

Key time-savers include:

• No more manual data extraction — data flows directly from ONESOURCE Pagero and ONESOURCE Indirect Compliance AI, removing the need to pull and reformat data from multiple systems
• Instant discrepancy detection — line-level differences are identified and classified automatically, with those impacting return boxes flagged as the priority
• Flexible data imports — data from any other source can be brought in, so you can standardise your reconciliation process across all systems in one place
• Audit-ready records — reconciliation outputs are structured and stored so your team is always prepared, without additional effort at audit time

The result is a reconciliation process that takes hours rather than days — and a team that spends less time on data and more time on decisions.

With the right foundation, yes — and that's exactly what ONESOURCE Indirect Compliance AI is built to do.

ONESOURCE Indirect Compliance AI pairs agentic AI with Thomson Reuters' expert-maintained tax content, covering indirect tax rules, rates, and filing requirements across jurisdictions globally. This means it's not making educated guesses — it's working from the same verified knowledge base that tax professionals trust.

Your team stays in control with human-in-the-loop controls— the AI just removes the manual, time-consuming work that gets in the way.