# Corporate tax provision: 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 a mid-market B2B company. Page: https://www.gane.ai/index/finance/tax/corporate-tax-provision/2026-11

**Standing:** Bloomberg Tax Provision leads with 19% of first choices; verdict contested. 59 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| Rank | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | [Bloomberg Tax Provision](https://www.gane.ai/index/finance/vendors/bloomberg-tax-provision/index.md) | 19% | 17% | 42 |
| 2 | [Thomson Reuters ONESOURCE Tax Provision](https://www.gane.ai/index/finance/vendors/thomson-reuters-onesource-tax-provision/index.md) | 17% | 30% | 53 |
| 3 | [Longview Tax](https://www.gane.ai/index/finance/vendors/longview-tax/index.md) | 10% | 16% | 45 |
| 6 | [Avalara](https://www.gane.ai/index/finance/vendors/avalara/index.md) | 5% | 21% | 19 |
| 9 | [OneStream Tax Provision](https://www.gane.ai/index/finance/vendors/onestream-tax-provision/index.md) | 2% | 0% | 11 |
| 10 | [Sovos Tax Provision](https://www.gane.ai/index/finance/vendors/sovos-tax-provision/index.md) | 2% | 0% | 13 |
| 12 | [CSC Corptax Accounting for Income Taxes](https://www.gane.ai/index/finance/vendors/csc-corptax-accounting-for-income-taxes/index.md) | 2% | 32% | 28 |
| 24 | [TurboTax Business](https://www.gane.ai/index/finance/vendors/turbotax-business/index.md) | 0% | 9% | 11 |
| 26 | [Oracle Tax Reporting](https://www.gane.ai/index/finance/vendors/oracle-tax-reporting/index.md) | 0% | 21% | 14 |
| 27 | [Vertex](https://www.gane.ai/index/finance/vendors/vertex/index.md) | 0% | 17% | 12 |
| 30 | [Workiva Tax and Provision](https://www.gane.ai/index/finance/vendors/workiva-tax-and-provision/index.md) | 0% | 23% | 13 |

Rank is by share of first choices among all 94 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: Bloomberg Tax Provision, OneStream Tax Provision; alternatives CCH Axcess Tax from Wolters Kluwer, CSC Corptax AIT
- GPT-5.4 mini: Wolters Kluwer CCH Tagetik Tax Provision; alternatives Longview Tax, Thomson Reuters ONESOURCE Tax Provision
- Gemini 3.5 Flash: Bloomberg Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, OneStream Tax Provision, Oracle Tax Reporting, Thomson Reuters ONESOURCE Tax Provision
- Perplexity Sonar: Bloomberg Tax Provision; alternatives Longview Tax, Thomson Reuters ONESOURCE Tax Provision
- Grok 4.20: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, CSC Corptax Accounting for Income Taxes, Exactera Tax Provision, Longview Tax
- Mistral Small: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision; alternatives Taxfyle
- DeepSeek V4 Flash: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, Longview Tax
- Llama 4 Maverick: Taxfyle; alternatives Avalara, Longview Tax, Thomson Reuters ONESOURCE Tax Provision
- Qwen 3.7 Flash: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, Longview Tax
- Kimi K2: Bloomberg Tax Provision; alternatives CSC Corptax Accounting for Income Taxes, Longview Tax, Thomson Reuters ONESOURCE Tax Provision
- GLM 4.7 FlashX: Avalara, Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, Commenda, Longview Tax
- MiniMax M2.5: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision; alternatives Account Ability, Longview Tax
- GPT-6 Luna: Thomson Reuters ONESOURCE Tax Provision; alternatives Corptax AIT, Longview Tax, Tax Series
- Muse Glimmer 30B: Taxfyle; alternatives Avalara, Bloomberg Tax Provision, Longview Tax by insightsoftware, Thomson Reuters ONESOURCE Tax Provision

## Sources the answers cite

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

- tax.thomsonreuters.com: 45 answers, 102 citations
- gane.ai/index: 26 answers, 38 citations
- getapp.com: 25 answers, 47 citations
- pro.bloombergtax.com: 24 answers, 51 citations
- capterra.com: 23 answers, 34 citations
- softwareadvice.com: 23 answers, 28 citations
- axiobench.com: 19 answers, 22 citations
- sourceforge.net: 19 answers, 21 citations

Pages named in the most answers:

- https://gane.ai/index/finance/tax/corporate-tax-provision (19 answers)
- https://tax.thomsonreuters.com/en/products/onesource-tax-provision (19 answers)
- https://softwareadvice.com/corporate-tax (17 answers)
- https://axiobench.com/best/corporate-tax-provision-software (14 answers)
- https://getapp.com/finance-accounting-software/corporate-tax/org/mid-size-business (13 answers)
- https://pro.bloombergtax.com/insights/tax-solutions/buyers-guide-how-to-find-the-right-tax-provision-software (13 answers)
- https://getapp.com/all-software/tax-preparation/org/mid-size-business (12 answers)
- https://capterra.com/corporate-tax-software (11 answers)
- https://viewpointanalysis.com/post/tax-management-software-options-2026 (11 answers)
- https://capterra.com/p/10027801/ONESOURCE-Tax-Provision (10 answers)

## Warned against

- Thomson Reuters ONESOURCE Tax Provision: 16 of 53 labels negative. "Avoid Enterprise Tools: ONESOURCE, Bloomberg, or Longview are top-rated for robust provision ... but have high licensing, implementation, and training costs" (Grok 4.20, budget prompt)
- CSC Corptax Accounting for Income Taxes: 9 of 28 labels negative. "Avoid as a first choice on a tight budget: ONESOURCE, CSC Corptax, and similar enterprise suites" (Perplexity Sonar, budget prompt)
- Bloomberg Tax Provision: 7 of 42 labels negative. "Avoid These If Budget-Constrained - Bloomberg Tax Provision — very powerful, but pricing is quote-only and typically $30K–$150K/year." (DeepSeek V4 Flash, budget prompt)
- Longview Tax: 7 of 45 labels negative. "explicitly says to 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.
New leader: Thomson Reuters ONESOURCE Tax Provision (21%) to Bloomberg Tax Provision (19%). Margin 2 points, within noise.

- TaxAct Business: 13% to 5%, −8. Inside the floor by 2 points · rank 3 → 7 of 94.
- Longview Tax: 4% to 10%, +6. Inside the floor by 4 points · rank 5 → 3 of 94.
- Avalara: 0% to 5%, +5. Inside the floor by 5 points · rank 28 → 6 of 94.
- Thomson Reuters ONESOURCE Tax Provision: 21% to 17%, −4. Inside the floor by 6 points · rank 1 → 2 of 94.
- Vertex: 4% to 0%, −4. Inside the floor by 6 points · rank 6 → 27 of 94.
- OneStream Tax Provision: 0% to 2%, +2. Inside the floor by 8 points · rank 20 → 9 of 94.
- CSC Corptax Accounting for Income Taxes: 0% to 2%, +2. Inside the floor by 8 points · rank 91 → 12 of 94.
- TurboTax Business: 2% to 0%, −2. Inside the floor by 8 points · rank 12 → 24 of 94.
- Bloomberg Tax Provision: 19% to 19%, ±0. Inside the floor by 10 points · rank 2 → 1 of 94.
- Sovos Tax Provision: 2% to 2%, ±0. Inside the floor by 10 points · rank 10 of 94, unchanged.
- Oracle Tax Reporting: 0% to 0%, ±0. Inside the floor by 10 points · rank 21 → 26 of 94.
- Workiva Tax and Provision: 0% to 0%, ±0. Inside the floor by 10 points · rank 24 → 30 of 94.

## 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.