# Thomson Reuters ONESOURCE vs Avalara: which do AI models recommend for corporate tax provision, September 2026

Finance AI Recommendation Index, September 2026 Edition, Corporate tax provision. Zero of twelve models named Thomson Reuters ONESOURCE first on the direct prompt; zero named Avalara. Page: https://finance-ai-index.com/tax/corporate-tax-provision/thomson-reuters-onesource-vs-avalara/

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Thomson Reuters ONESOURCE | 10% | #3 of 9 | 16% | 19 | 9 of 12 |
| Avalara | 7% | #5 of 9 | 27% | 11 | 9 of 12 |

## The direct prompt, model by model

- Claude Haiku 4.5: neither first, one named (alternatives: Bloomberg Tax Provision, CSC Corptax, Longview Tax, Thomson Reuters ONESOURCE)
- Llama 4 Maverick: neither first, one named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Avalara, CCH Axcess Tax, Taxfyle)
- Qwen 3.7 Flash: neither first, one named (first choices: Longview Tax) (alternatives: Bloomberg Tax Provision, CSC Corptax, Thomson Reuters ONESOURCE)
- 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)
- Gemini 3.5 Flash: neither named (first choices: Bloomberg Tax Provision) (alternatives: Exactera Tax Provision, Longview Tax, Thomson Reuters ONESOURCE Tax Provision, Vena Solutions)
- 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)
- DeepSeek V4 Flash: neither named (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- 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)
- GLM 4.7 FlashX: neither named (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, Longview Tax, Sovos Tax Provision)
- MiniMax M2.5: neither named (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Tagetik Tax Provision & Reporting, Taxfyle, Vertex Tax Accounting)

## What the models said about Thomson Reuters ONESOURCE

- "Enterprise Options to AVOID on a Limited Budget | Thomson Reuters ONESOURCE | $200K–$2M+/year" (Kimi K2, budget prompt, hard negative)
- "Avoid: Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax." (DeepSeek V4 Flash, budget prompt, hard negative)
- "cannot justify the six-figure price tag of enterprise suites like Bloomberg or Thomson Reuters ONESOURCE" (Qwen 3.7 Flash, budget prompt, soft negative)
- "Choose Thomson Reuters ONESOURCE if you are a larger, audited mid-market C-Corp with multiple subsidiaries" (Gemini 3.5 Flash, paraphrase prompt, first choice)
- "I'd recommend Thomson Reuters ONESOURCE as the top choice for income tax compliance software" (Grok 4.1 Fast, paraphrase prompt, first choice)
- "Corporate income tax (direct tax) | Thomson Reuters ONESOURCE or Vertex" (GLM 4.7 FlashX, paraphrase prompt, first choice)

## What the models said about Avalara

- "Platforms like *Avalara AvaTax*, *TaxJar*, or *Anrok* ... they do not file corporate income taxes" (Gemini 3.5 Flash, paraphrase prompt, hard negative)
- "Automated sales tax tools improperly configured (e.g., Avalara) ... "garbage in, garbage out."" (DeepSeek V4 Flash, negative prompt, soft negative)
- "I would recommend Avalara as the default choice if you need broad, scalable compliance coverage and ERP integration." (Perplexity Sonar, 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.