# Corporate tax provision for enterprise buyers: what AI models recommend, September 2026 Gane 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://www.gane.ai/index/finance/tax/corporate-tax-provision/2026-09/enterprise This is the permanent record of the September 2026 Edition, published September 17, 2026 and superseded since. The current standing: https://www.gane.ai/index/finance/tax/corporate-tax-provision/enterprise/index.md **Standing:** Thomson Reuters ONESOURCE Tax Provision leads with 64% of first choices; verdict clear leader. 44 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) | 64% | 5% | 58 | | 2 | [CSC Corptax Accounting for Income Taxes](https://www.gane.ai/index/finance/vendors/csc-corptax-accounting-for-income-taxes/index.md) | 5% | 7% | 27 | | 3 | [Sovos Tax Provision](https://www.gane.ai/index/finance/vendors/sovos-tax-provision/index.md) | 5% | 11% | 28 | | 6 | [Bloomberg Tax Provision](https://www.gane.ai/index/finance/vendors/bloomberg-tax-provision/index.md) | 2% | 9% | 34 | | 7 | [Wolters Kluwer CCH Tagetik Tax Provision](https://www.gane.ai/index/finance/vendors/wolters-kluwer-cch-tagetik-tax-provision/index.md) | 2% | 0% | 21 | | 8 | [Longview Tax](https://www.gane.ai/index/finance/vendors/longview-tax/index.md) | 2% | 19% | 26 | | 9 | [Vertex](https://www.gane.ai/index/finance/vendors/vertex/index.md) | 2% | 0% | 11 | | 14 | [Oracle Tax Reporting](https://www.gane.ai/index/finance/vendors/oracle-tax-reporting/index.md) | 0% | 0% | 15 | | 15 | [Workiva Tax and Provision](https://www.gane.ai/index/finance/vendors/workiva-tax-and-provision/index.md) | 0% | 0% | 10 | Rank is by share of first choices among all 59 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, Longview Tax, Oracle Tax Reporting - GPT-5.4 mini: Thomson Reuters ONESOURCE Tax Provision; alternatives CSC Corptax Accounting for Income Taxes - 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, Sovos Tax Provision, Wolters Kluwer CCH Tagetik Tax Provision, Workiva Tax and Provision - Grok 4.20: 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 Sovos Tax Provision, Wolters Kluwer CCH Tagetik Tax Provision, Workiva Tax and 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: - tax.thomsonreuters.com: 44 answers, 85 citations - worldmetrics.org: 41 answers, 113 citations - zipdo.co: 32 answers, 52 citations - wifitalents.com: 29 answers, 49 citations - gitnux.org: 28 answers, 53 citations - pro.bloombergtax.com: 27 answers, 58 citations - cbh.com: 26 answers, 27 citations - gartner.com: 25 answers, 35 citations Pages named in the most answers: - https://cbh.com/insights/articles/tax-provision-automation-guide-benefits-software-roadmap (26 answers) - https://zipdo.co/best/corporate-tax-provision-software (25 answers) - https://worldmetrics.org/best/tax-provision-software (24 answers) - https://gartner.com/reviews/market/tax-software (23 answers) - https://theaccountingclub.net/best-corporate-tax-software (23 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) - Thomson Reuters ONESOURCE Tax Provision: 3 of 58 labels negative. "Avoid per-seat models (like ONESOURCE at $25K-$80K per seat) for large user bases" (Kimi K2, budget 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) ## Record - Method: https://www.gane.ai/index/finance/methodology - License: CC BY 4.0. Cite as Gane Index, September 2026 Edition, www.gane.ai/index/finance.