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

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

| | First-choice share | Rank | Negative rate | Labels | Models naming it |
|---|---|---|---|---|---|
| Thomson Reuters ONESOURCE Tax Provision | 26% | #1 of 9 | 15% | 33 | 12 of 12 |
| Avalara | 7% | #5 of 9 | 27% | 11 | 9 of 12 |

## The direct prompt, model by model

- GPT-5.4 mini: thomson reuters onesource tax provision first (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: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: CSC Corptax, Wolters Kluwer CCH Tagetik Tax Provision & Reporting)
- Grok 4.1 Fast: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: TaxPoint, Taxfyle, Vertex Tax Accounting)
- Mistral Small: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- DeepSeek V4 Flash: thomson reuters onesource tax provision first (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: Sovos Tax Provision, Vertex Tax Accounting)
- Llama 4 Maverick: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Avalara, CCH Axcess Tax, Taxfyle)
- Kimi K2: thomson reuters onesource tax provision first (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: thomson reuters onesource tax provision first (first choices: Thomson Reuters ONESOURCE Tax Provision) (alternatives: Bloomberg Tax Provision, Longview Tax, Sovos Tax Provision)
- MiniMax M2.5: thomson reuters onesource tax provision first (first choices: Bloomberg Tax Provision, Thomson Reuters ONESOURCE Tax Provision) (alternatives: CCH Tagetik Tax Provision & Reporting, Taxfyle, Vertex Tax Accounting)
- Gemini 3.5 Flash: neither first, one named (first choices: Bloomberg Tax Provision) (alternatives: Exactera Tax Provision, Longview Tax, Thomson Reuters ONESOURCE Tax Provision, Vena Solutions)
- Claude Haiku 4.5: neither named (alternatives: Bloomberg Tax Provision, CSC Corptax, Longview Tax, Thomson Reuters ONESOURCE)
- Qwen 3.7 Flash: neither named (first choices: Longview Tax) (alternatives: Bloomberg Tax Provision, CSC Corptax, Thomson Reuters ONESOURCE)

## What the models said about Thomson Reuters ONESOURCE Tax Provision

- "mid-market enterprises or lean tax teams (fewer than 5–10 people) should approach them with caution" (Gemini 3.5 Flash, negative prompt, soft negative)
- "these systems may represent more cost, complexity, and implementation friction than you need" (Gemini 3.5 Flash, scale prompt, soft negative)
- "routinely costs between $50,000 and $100,000+ annually in licensing and implementation fees" (Gemini 3.5 Flash, budget prompt, soft negative)
- "For most mid-market B2B companies, ONESOURCE Tax Provision is the safest choice due to its balance of power, audit readiness, and scalability." (Kimi K2, direct prompt, first choice)
- "Leading solution for automating ASC 740 tax provision calculations, ETR analysis, and financial disclosures with robust integrations" (Claude Haiku 4.5, comparative prompt, first choice)
- "OTP is the market-heavyweight software.... Best For: Large, multinational corporations seeking an end-to-end global tax ecosystem." (Gemini 3.5 Flash, comparative 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.