# Corporate tax provision: 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 a mid-market B2B company. Page: https://finance-ai-index.com/tax/corporate-tax-provision/

**Standing:** Thomson Reuters ONESOURCE Tax Provision leads with 26% of first choices; verdict contested. 42 first choices across the direct, paraphrase, budget and scale prompts.

## First-choice share

| # | Product | Share | Negative rate | Labels |
|---|---|---|---|---|
| 1 | Thomson Reuters ONESOURCE Tax Provision | 26% | 15% | 33 |
| 2 | Bloomberg Tax Provision | 10% | 14% | 43 |
| 3 | Thomson Reuters ONESOURCE | 10% | 16% | 19 |
| 4 | Longview Tax | 7% | 18% | 28 |
| 5 | Avalara | 7% | 27% | 11 |
| 6 | Vertex | 2% | 40% | 10 |
| 7 | Sovos Tax Provision | 0% | 0% | 21 |
| 8 | Workiva | 0% | 9% | 11 |
| 9 | CSC Corptax | 0% | 33% | 24 |

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

- Claude Haiku 4.5: no first choice; alternatives Bloomberg Tax Provision, CSC Corptax, Longview Tax, Thomson Reuters ONESOURCE
- GPT-5.4 mini: Thomson Reuters ONESOURCE Tax Provision; alternatives CCH Axcess/ProSystem fx tax provision offerings, Longview Tax, ONESOURCE Income Tax / Direct Tax Essential
- Gemini 3.5 Flash: Bloomberg Tax Provision; alternatives Exactera Tax Provision, Longview Tax, Thomson Reuters ONESOURCE Tax Provision, Vena Solutions
- Perplexity Sonar: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax, Wolters Kluwer CCH Tagetik Tax Provision & Reporting
- Grok 4.1 Fast: Thomson Reuters ONESOURCE Tax Provision; alternatives TaxPoint, Taxfyle, Vertex Tax Accounting
- Mistral Small: Thomson Reuters ONESOURCE Tax Provision; alternatives Sovos Tax Provision, Vertex Tax Accounting
- DeepSeek V4 Flash: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision; alternatives Sovos Tax Provision, Vertex Tax Accounting
- Llama 4 Maverick: Thomson Reuters ONESOURCE Tax Provision; alternatives Avalara, CCH Axcess Tax, Taxfyle
- Qwen 3.7 Flash: Longview Tax; alternatives Bloomberg Tax Provision, CSC Corptax, Thomson Reuters ONESOURCE
- Kimi K2: Thomson Reuters ONESOURCE Tax Provision; alternatives CCH Tagetik, FloQast Tax Provision, Longview Tax, Lucasys Tax Provision
- GLM 4.7 FlashX: Thomson Reuters ONESOURCE Tax Provision; alternatives Bloomberg Tax Provision, Longview Tax, Sovos Tax Provision
- MiniMax M2.5: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision; alternatives CCH Tagetik Tax Provision & Reporting, Taxfyle, Vertex Tax Accounting

## Sources the answers cite

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

- worldmetrics.org: 42 answers, 98 citations
- zipdo.co: 39 answers, 56 citations
- gitnux.org: 37 answers, 68 citations
- pro.bloombergtax.com: 34 answers, 54 citations
- tax.thomsonreuters.com: 33 answers, 59 citations
- wifitalents.com: 30 answers, 50 citations
- cbh.com: 16 answers, 16 citations
- guideflow.com: 15 answers, 15 citations

Pages named in the most answers:

- https://zipdo.co/best/corporate-tax-provision-software (32 answers)
- https://worldmetrics.org/best/tax-provision-software (28 answers)
- https://wifitalents.com/best/tax-provision-software (24 answers)
- https://worldmetrics.org/best/corporate-tax-software (20 answers)
- https://pro.bloombergtax.com/insights/tax-solutions/buyers-guide-how-to-find-the-right-tax-provision-software (17 answers)
- https://worldmetrics.org/best/corporate-tax-provision-software (17 answers)
- https://cbh.com/insights/articles/tax-provision-automation-guide-benefits-software-roadmap (15 answers)
- https://gitnux.org/best/tax-provisioning-software (15 answers)
- https://gartner.com/reviews/market/tax-software (14 answers)
- https://rightworks.com/blog/best-accounting-tax-software-applications (14 answers)

## Warned against

- Excel: 6 of 7 labels negative. "Many companies rely upon Excel for calculating their provision for income taxes, but many limitations exist when trying to use Excel to accurately calculate income taxes under ASC 740." (Claude Haiku 4.5, negative prompt)
- CSC Corptax: 8 of 24 labels negative. "Avoid for Limited Budgets ... Corptax (Wolters Kluwer): Average deal sizes are ~$80k\u2013$130k" (Qwen 3.7 Flash, budget prompt)
- Longview Tax: 5 of 28 labels negative. "Avoid: Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax." (DeepSeek V4 Flash, budget prompt)
- Bloomberg Tax Provision: 6 of 43 labels negative. "Bloomberg Tax Provision: An enterprise-grade platform with high implementation overhead." (Qwen 3.7 Flash, 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.