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

Gane Index, November 2026 Edition. Named in 53 judge labels across 1 category by 14 of 14 models. Page: https://www.gane.ai/index/finance/vendors/thomson-reuters-onesource-tax-provision

## Standing by category

| Category | Share | Rank | Negative rate | Labels |
|---|---|---|---|---|
| [Corporate tax provision](https://www.gane.ai/index/finance/tax/corporate-tax-provision/index.md) | 17% | 2 | 30% | 53 |

## What the models said for it

- "For corporate tax provisions, use established enterprise software like Thomson Reuters ONESOURCE or Wolters Kluwer CCH Axcess, but vet them through your organization's IT/security team." (Grok 4.20, Corporate tax provision)
- "the "best" corporate tax provision software generally comes down to two top contenders: Bloomberg Tax Provision and Thomson Reuters ONESOURCE" (Qwen 3.7 Flash, Corporate tax provision)
- "I'd suggest starting with either Bloomberg Tax Provision or ONESOURCE Tax Provision as your primary considerations" (MiniMax M2.5, Corporate tax provision)
- "Long-time market leader (historically ~21% market share)... Market-leading calculation engine for complex tax scenarios" (Kimi K2, Corporate tax provision)

## And against it

- "Avoid Enterprise Tools: ONESOURCE, Bloomberg, or Longview are top-rated for robust provision ... but have high licensing, implementation, and training costs" (Grok 4.20, Corporate tax provision)
- "What to avoid on a tight budget: Enterprise provision suites such as Thomson Reuters ONESOURCE Tax Provision" (Muse Glimmer 30B, Corporate tax provision)
- "Avoid as a first choice on a tight budget: ONESOURCE, CSC Corptax, and similar enterprise suites" (Perplexity Sonar, Corporate tax provision)
- "Avoid ONESOURCE and Corptax unless you have a Fortune-500-style tax department." (Muse Glimmer 30B, Corporate tax provision)

## By model

| Model | First choice | Alternative | Mention | Warning | Labels |
|---|---|---|---|---|---|
| Claude Haiku 4.5 | 1 | 1 | 0 | 0 | 2 |
| GPT-5.4 mini | 1 | 1 | 0 | 1 | 3 |
| Gemini 3.5 Flash | 2 | 2 | 0 | 2 | 6 |
| Perplexity Sonar | 1 | 1 | 0 | 1 | 3 |
| Grok 4.20 | 3 | 0 | 1 | 2 | 6 |
| Mistral Small | 3 | 0 | 1 | 1 | 5 |
| DeepSeek V4 Flash | 2 | 0 | 1 | 2 | 5 |
| Llama 4 Maverick | 0 | 1 | 0 | 1 | 2 |
| Qwen 3.7 Flash | 1 | 0 | 1 | 2 | 4 |
| Kimi K2 | 2 | 1 | 0 | 1 | 4 |
| GLM 4.7 FlashX | 1 | 2 | 0 | 0 | 3 |
| MiniMax M2.5 | 2 | 0 | 1 | 0 | 3 |
| GPT-6 Luna | 1 | 0 | 1 | 0 | 2 |
| Muse Glimmer 30B | 1 | 1 | 0 | 3 | 5 |

## Sources returned with these answers

The sites and pages cited by the answers that named Thomson Reuters ONESOURCE Tax Provision, from 149 of the 161 answers that named it (only the models that return a source list).

### Domains cited

- tax.thomsonreuters.com: 94 (its own site)
- gane.ai/index: 67
- pro.bloombergtax.com: 52
- capterra.com: 44
- getapp.com: 38
- softwareadvice.com: 38
- axiobench.com: 35
- rankite.com: 33
- sourceforge.net: 32
- cscglobal.com: 27

### Pages cited

- https://tax.thomsonreuters.com/en/products/onesource-tax-provision: 42
- https://www.gane.ai/index/finance/tax/corporate-tax-provision/enterprise: 38
- https://pro.bloombergtax.com/insights/tax-solutions/buyers-guide-how-to-find-the-right-tax-provision-software: 31
- https://softwareadvice.com/corporate-tax: 27
- https://axiobench.com/best/corporate-tax-provision-software: 24
- https://www.gane.ai/index/finance/tax/corporate-tax-provision: 21
- https://tax.thomsonreuters.com/en/tax-accounting/tax-software-for-larger-businesses: 21
- https://rankite.com/blog/best-tax-provision-software: 20

## 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://www.gane.ai/index/finance/methodology
- License: CC BY 4.0. Cite as Gane Index, November 2026 Edition, www.gane.ai/index/finance.