# Bloomberg Tax Provision vs Vertex: which do AI models recommend for corporate tax provision, September 2026

Finance AI Recommendation Index, September 2026 Edition, Corporate tax provision. Three of twelve models named Bloomberg Tax Provision first on the direct prompt; zero named Vertex. Page: https://finance-ai-index.com/tax/corporate-tax-provision/bloomberg-tax-provision-vs-vertex/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Bloomberg Tax Provision | 10% | #2 of 9 | 14% | 43 | 11 of 12 |
| Vertex | 2% | #6 of 9 | 40% | 10 | 7 of 12 |

## The direct prompt, model by model

- Gemini 3.5 Flash: bloomberg tax provision first (first choices: Bloomberg Tax Provision) (alternatives: Exactera Tax Provision, Longview Tax, Thomson Reuters ONESOURCE Tax Provision, Vena Solutions)
- DeepSeek V4 Flash: bloomberg tax provision first (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- MiniMax M2.5: bloomberg tax provision first (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Tagetik Tax Provision & Reporting, Taxfyle, Vertex Tax Accounting)
- Claude Haiku 4.5: neither first, one named (alternatives: Bloomberg Tax Provision, CSC Corptax, Longview Tax, Thomson Reuters ONESOURCE)
- Qwen 3.7 Flash: neither first, one named (first choices: Longview Tax) (alternatives: Bloomberg Tax Provision, CSC Corptax, Thomson Reuters ONESOURCE)
- GLM 4.7 FlashX: neither first, one named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, Longview Tax, Sovos Tax Provision)
- GPT-5.4 mini: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Axcess/ProSystem fx tax provision offerings, Longview Tax, ONESOURCE Income Tax / Direct Tax Essential)
- Perplexity Sonar: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CSC Corptax, Wolters Kluwer CCH Tagetik Tax Provision & Reporting)
- Grok 4.1 Fast: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: TaxPoint, Taxfyle, Vertex Tax Accounting)
- Mistral Small: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- Llama 4 Maverick: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Avalara, CCH Axcess Tax, Taxfyle)
- Kimi K2: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Tagetik, FloQast Tax Provision, Longview Tax, Lucasys Tax Provision, Sovos Tax Provision)

## What the models said about Bloomberg Tax Provision

- "Bloomberg Tax Provision: An enterprise-grade platform with high implementation overhead." (Qwen 3.7 Flash, budget prompt, hard negative)
- "significantly cheaper than enterprise solutions like Bloomberg (often $50k-$100k+)" (DeepSeek V4 Flash, budget prompt, soft negative)
- "Deep analytics, but lighter on full compliance | Costly for pure filing needs" (Grok 4.1 Fast, paraphrase prompt, soft negative)
- "Frequently the "go-to" for mid-market companies. It is highly regarded for its transparent calculations (no black box), rapid implementation, and excellent customer support." (Gemini 3.5 Flash, scale prompt, first choice)
- "If you want the absolute best mix of rapid setup (<2 months), robust calculation, and intuitive interface, choose Bloomberg Tax Provision." (Gemini 3.5 Flash, direct prompt, first choice)
- "Choose Corptax or Bloomberg if you need comprehensive enterprise-grade automation with the highest audit standards" (Kimi K2, comparative prompt, first choice)

## What the models said about Vertex

- "Enterprise-focused, indirect tax only (no provision)" (Kimi K2, budget prompt, hard negative)
- "consider Vertex for indirect tax, but it is not the clearest provision-first choice from the sources I found" (GPT-5.4 mini, direct prompt, soft negative)
- "Corporate income tax (direct tax) | Thomson Reuters ONESOURCE or Vertex" (GLM 4.7 FlashX, paraphrase prompt, first choice)

Share is the count of first choices across the direct, paraphrase, budget and scale prompts over all twelve models, for a mid-market B2B company; rank is within the category. Comparisons are drawn for the top eight products in each category. Published under CC BY 4.0; the output is the models' output, and nothing here is a recommendation by the index.