# Corporate tax provision for enterprise buyers: what AI models recommend, September 2026

Finance AI Recommendation Index, September 2026 Edition. Asked as "corporate tax provision software" and as "income tax compliance software", six framings each, to twelve models with search on, on behalf of an enterprise B2B company. Page: https://finance-ai-index.com/tax/corporate-tax-provision/enterprise/

**Standing:** Thomson Reuters ONESOURCE Tax Provision leads with 43% of first choices; verdict clear leader. 44 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| # | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | Thomson Reuters ONESOURCE Tax Provision | 43% | 3% | 36 |
| 2 | Thomson Reuters ONESOURCE | 20% | 10% | 20 |
| 3 | CSC Corptax | 5% | 7% | 27 |
| 4 | Sovos Tax Provision | 5% | 11% | 28 |
| 5 | Bloomberg Tax Provision | 2% | 9% | 34 |
| 6 | Longview Tax | 2% | 19% | 26 |
| 7 | CCH Tagetik | 2% | 0% | 14 |
| 8 | Vertex | 2% | 0% | 11 |
| 9 | Oracle Tax Reporting | 0% | 0% | 10 |

## Each model's first choice on the direct prompt

- Claude Haiku 4.5: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax, Longview Tax, Oracle Tax Reporting
- GPT-5.4 mini: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax
- Gemini 3.5 Flash: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax, Longview Tax, OneStream Tax Provision
- Perplexity Sonar: Thomson Reuters ONESOURCE; alternatives CCH Tagetik, CSC Corptax, Sovos Tax Provision, Workiva
- Grok 4.1 Fast: Thomson Reuters ONESOURCE Tax Provision; alternatives Longview Tax, Sovos Tax Provision
- Mistral Small: Thomson Reuters ONESOURCE Tax Provision; alternatives Longview Tax, Sovos Tax Provision
- DeepSeek V4 Flash: Thomson Reuters ONESOURCE Tax Provision; alternatives CCH Tagetik, Sovos Tax Provision, Workiva Tax Provision
- Llama 4 Maverick: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, Longview Tax, Sovos Tax Provision
- Qwen 3.7 Flash: Thomson Reuters ONESOURCE Tax Provision; alternatives Longview Tax, Wolters Kluwer CCH Tagetik Tax Provision
- Kimi K2: Sovos Tax Provision, Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, Longview Tax, Oracle Tax Reporting
- GLM 4.7 FlashX: Thomson Reuters ONESOURCE Tax Provision; alternatives Longview Tax, Sovos Tax Provision
- MiniMax M2.5: Thomson Reuters ONESOURCE Tax Provision; alternatives OneStream Tax Provision, Sovos Tax Provision

## Sources the answers cite

68 of 72 answers came back with a source list, from 12 of 12 models. Sites named in the most answers:

- worldmetrics.org: 41 answers, 113 citations
- tax.thomsonreuters.com: 40 answers, 78 citations
- zipdo.co: 32 answers, 52 citations
- wifitalents.com: 29 answers, 49 citations
- gitnux.org: 28 answers, 53 citations
- wolterskluwer.com: 24 answers, 32 citations
- cbh.com: 24 answers, 25 citations
- theaccountingclub.net: 23 answers, 23 citations

Pages named in the most answers:

- https://zipdo.co/best/corporate-tax-provision-software (25 answers)
- https://cbh.com/insights/articles/tax-provision-automation-guide-benefits-software-roadmap (24 answers)
- https://worldmetrics.org/best/tax-provision-software (24 answers)
- https://theaccountingclub.net/best-corporate-tax-software (23 answers)
- https://gartner.com/reviews/market/tax-software (22 answers)
- https://worldmetrics.org/best/corp-tax-software (22 answers)
- https://worldmetrics.org/best/corporate-tax-software (22 answers)
- https://viewpointanalysis.com/post/tax-management-software-options-2026 (20 answers)
- https://wifitalents.com/best/tax-provision-software (19 answers)
- https://wolterskluwer.com/en/solutions/cch-tagetik/tax-provision-reporting (19 answers)

## Warned against

- Longview Tax: 5 of 26 labels negative. "Legacy Tools with Stale Architecture (e.g., Longview Tax) ... Longview Tax scored significantly lower (6.2/10)" (DeepSeek V4 Flash, negative prompt)
- Spreadsheets: 3 of 3 labels negative. "The risk of inaccuracies and lack of auditability makes them a poor choice for large enterprises" (Mistral Small, negative prompt)
- Bloomberg Tax Provision: 3 of 34 labels negative. "Pricing is often opaque or quote-based, and it lacks the per-user flexibility of Tagetik for very large, distributed teams." (GLM 4.7 FlashX, budget prompt)
- Sovos Tax Provision: 3 of 28 labels negative. "Pricing is modular and driven by transaction volume, jurisdictions, and modules, making it less predictable" (Mistral Small, budget prompt)

## 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, September 2026 Edition, finance-ai-index.com.