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

Gane Index, November 2026 Edition. Asked as "corporate tax provision software" and as "income tax compliance software", six framings each, to fourteen models with search on, on behalf of an enterprise B2B company. Page: https://www.gane.ai/index/finance/tax/corporate-tax-provision/enterprise

**Standing:** Thomson Reuters ONESOURCE Tax Provision leads with 77% of first choices; verdict clear leader. 52 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [Thomson Reuters ONESOURCE Tax Provision](https://www.gane.ai/index/finance/vendors/thomson-reuters-onesource-tax-provision/index.md) | 77% | 7% | 68 |
| 2 | [CSC Corptax Accounting for Income Taxes](https://www.gane.ai/index/finance/vendors/csc-corptax-accounting-for-income-taxes/index.md) | 8% | 6% | 50 |
| 3 | [Vertex](https://www.gane.ai/index/finance/vendors/vertex/index.md) | 4% | 27% | 15 |
| 4 | [Longview Tax](https://www.gane.ai/index/finance/vendors/longview-tax/index.md) | 2% | 8% | 38 |
| 5 | [OneStream Tax Provision](https://www.gane.ai/index/finance/vendors/onestream-tax-provision/index.md) | 2% | 0% | 15 |
| 10 | [Bloomberg Tax Provision](https://www.gane.ai/index/finance/vendors/bloomberg-tax-provision/index.md) | 0% | 14% | 29 |
| 11 | [Oracle Tax Reporting](https://www.gane.ai/index/finance/vendors/oracle-tax-reporting/index.md) | 0% | 17% | 18 |
| 12 | [Vertex Tax Accounting](https://www.gane.ai/index/finance/vendors/vertex-tax-accounting/index.md) | 0% | 0% | 10 |
| 13 | [Sovos Tax Provision](https://www.gane.ai/index/finance/vendors/sovos-tax-provision/index.md) | 0% | 14% | 14 |
| 15 | [Avalara](https://www.gane.ai/index/finance/vendors/avalara/index.md) | 0% | 25% | 12 |

Rank is by share of first choices among all 73 products named; products with the same share are tied, and the order among them carries no meaning. The table lists those with at least 10 labels.

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

- Claude Haiku 4.5: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax Accounting for Income Taxes, OneStream Tax Provision, SAP Tax Compliance
- GPT-5.4 mini: Thomson Reuters ONESOURCE Tax Provision; alternatives Longview Tax, Oracle Tax Reporting, Wolters Kluwer
- Gemini 3.5 Flash: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax Accounting for Income Taxes, Longview Tax, OneStream Tax Provision
- Perplexity Sonar: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, Longview Tax, Oracle Tax Reporting
- Grok 4.20: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, Longview Tax, Vertex Corporate Tax
- Mistral Small: Thomson Reuters ONESOURCE Tax Provision; alternatives CCH Axcess Tax, CSC Corptax Accounting for Income Taxes
- DeepSeek V4 Flash: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax Accounting for Income Taxes
- Llama 4 Maverick: Thomson Reuters ONESOURCE Tax Provision; alternatives Avalara, CSC Corptax Accounting for Income Taxes, OneStream Tax Provision, Taxfyle
- Qwen 3.7 Flash: CSC Corptax Accounting for Income Taxes, Thomson Reuters ONESOURCE Tax Provision; alternatives Longview Tax
- Kimi K2: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax Accounting for Income Taxes, Longview Tax
- GLM 4.7 FlashX: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, Vertex Corporate Tax, Wolters Kluwer CCH Tagetik Tax Provision
- MiniMax M2.5: Thomson Reuters – CorpTax; alternatives Oracle Tax Reporting, SAP Tax Compliance, Thomson Reuters – OneSource Tax Provision, Vertex
- GPT-6 Luna: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax AIT, Longview Tax, Oracle Tax Reporting
- Muse Glimmer 30B: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, OneStream Tax Provision, Sovos Tax Provision, Vertex Tax Accounting

## Sources the answers cite

75 of 84 answers came back with a source list, from 14 of 14 models. Sites named in the most answers:

- tax.thomsonreuters.com: 53 answers, 148 citations
- gane.ai/index: 38 answers, 42 citations
- pro.bloombergtax.com: 20 answers, 36 citations
- cscglobal.com: 20 answers, 30 citations
- rankite.com: 18 answers, 27 citations
- axiobench.com: 17 answers, 25 citations
- sourceforge.net: 15 answers, 15 citations
- gitnux.org: 12 answers, 17 citations

Pages named in the most answers:

- https://gane.ai/index/finance/tax/corporate-tax-provision/enterprise (35 answers)
- https://tax.thomsonreuters.com/en/products/onesource-tax-provision (19 answers)
- https://tax.thomsonreuters.com/en/tax-accounting/tax-software (15 answers)
- https://tax.thomsonreuters.com/en/tax-accounting/tax-software-for-larger-businesses (15 answers)
- https://cscglobal.com/service/corptax (13 answers)
- https://cbh.com/insights/articles/tax-provision-automation-guide-benefits-software-roadmap (12 answers)
- https://pro.bloombergtax.com/insights/tax-solutions/buyers-guide-how-to-find-the-right-tax-provision-software (12 answers)
- https://rankite.com/blog/best-corporate-tax-software (12 answers)
- https://tools.resorsit.com/tools/business-applications/corporate-tax (12 answers)
- https://axiobench.com/best/tax-provisioning-software (11 answers)

## Warned against

- Excel: 5 of 5 labels negative. "While Excel is still widely used, it is error-prone, lacks audit trails, and does not scale well for large, multi-entity organizations." (Mistral Small, negative prompt)
- Thomson Reuters ONESOURCE Tax Provision: 5 of 68 labels negative. "Avoid pure standalone Tax engines with per-seat licensing: Named-user fees for 1,000+ users on specialized tax engines are rarely cost-effective." (Gemini 3.5 Flash, budget prompt)
- CSC Corptax Accounting for Income Taxes: 3 of 50 labels negative. "avoid or be cautious about Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax" (Muse Glimmer 30B, negative prompt)
- Oracle Tax Reporting: 3 of 18 labels negative. "avoid or be cautious about Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax" (Muse Glimmer 30B, negative prompt)

## Movement since October 2026

Floor: 10 points of share, measured on the calibration repeat.
Same leader: Thomson Reuters ONESOURCE Tax Provision at 77%.

- Thomson Reuters ONESOURCE Tax Provision: 46% to 77%, +31. Cleared the floor by 21 points · rank 1 of 73, unchanged.
- CSC Corptax Accounting for Income Taxes: 12% to 8%, −4. Inside the floor by 6 points · rank 2 of 73, unchanged.
- Bloomberg Tax Provision: 4% to 0%, −4. Inside the floor by 6 points · rank 4 → 10 of 73.
- Wolters Kluwer CCH Tagetik Tax Provision: 4% to 0%, −4. Inside the floor by 6 points · rank 5 → 14 of 73.
- Vertex: 2% to 4%, +2. Inside the floor by 8 points · rank 8 → 3 of 73.
- OneStream Tax Provision: 0% to 2%, +2. Inside the floor by 8 points · rank 21 → 5 of 73.
- Sovos Tax Provision: 2% to 0%, −2. Inside the floor by 8 points · rank 6 → 13 of 73.
- Avalara: 2% to 0%, −2. Inside the floor by 8 points · rank 17 → 15 of 73.
- Longview Tax: 2% to 2%, ±0. Inside the floor by 10 points · rank 7 → 4 of 73.
- Oracle Tax Reporting: 0% to 0%, ±0. Inside the floor by 10 points · rank 18 → 11 of 73.
- Vertex Tax Accounting: 0% to 0%, ±0. Inside the floor by 10 points · rank 20 → 12 of 73.

## 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.