# Thomson Reuters ONESOURCE Tax Provision: how AI models rank it, October 2026

Finance AI Recommendation Index, October 2026 Edition. Named in 57 judge labels across 1 categories by 14 of 14 models. Page: https://finance-ai-index.com/vendors/thomson-reuters-onesource-tax-provision/

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| Corporate tax provision | 21% | 1 | 39% | 57 |

## What the models said for it

- "Often tops lists for consolidated provisions... ONESOURCE in audit-proofing; Analyst reports like Gartner often rate ONESOURCE/Vertex highly for this segment." (Grok 4.1 Fast, Corporate tax provision)
- "Thomson Reuters ONESOURCE Tax Provision is the most cited first choice in the mid-market set, and is the accepted enterprise standard" (Muse Glimmer 30B, Corporate tax provision)
- "1. ONESOURCE Tax Provision (by Thomson Reuters) ... Real-time capabilities and robust integration with other tax workflow tools." (Mistral Small, Corporate tax provision)
- "Best known for large, multinational close and provision workflows... ONESOURCE Tax Provision is positioned for that use case." (GPT-5.4 mini, Corporate tax provision)

## And against it

- "explicitly says to avoid or be cautious about Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax" (Perplexity Sonar, Corporate tax provision)
- ""Avoid for now: OneSource, Corptax, Longview – these are enterprise-grade tools with enterprise-grade price tags."" (Muse Glimmer 30B, Corporate tax provision)
- "Avoid Bloomberg Tax Provision, Thomson Reuters ONESOURCE, and other enterprise\u2011grade provision platforms" (GLM 4.7 FlashX, Corporate tax provision)
- "avoid enterprise-grade tools like ONESOURCE, Corptax, Longview, and Bloomberg Tax Provision" (Mistral Small, Corporate tax provision)

## Movement since September 2026

Floor: 10 points of share, measured on the calibration repeat. A larger change is movement; a smaller one is noise.

- Corporate tax provision: 36% to 21%, −18. Cleared the floor by 8 points · rank 1 of 102, unchanged.

## In its own words

What Thomson Reuters ONESOURCE Tax Provision's own pages state, read 2026-09-28. Stated by the vendor, not checked by the index.

- Positioning: Expedite financial close with automated software that calculates tax estimates in seconds and streamlines reporting. (https://www.thomsonreuters.com/en/reports/total-economic-impact-of-thomson-reuters-onesource)
- For: i team fiscali dei gruppi multinazionali (https://europe.thomsonreuters.com/it/live-webinars/onesource-tax-provision-per-il-tax-accounting-e-la-compliance-fiscale)

## Record

- Method: https://finance-ai-index.com/methodology/
- Raw judge labels and full responses: https://finance-ai-index.com/data/
- License: CC BY 4.0. Cite as Finance AI Recommendation Index, October 2026 Edition, finance-ai-index.com.