ChatGPT's answers on financial and tax prompts are consistently correct, so AI tax help is reliable enough for the 26% of Americans now using it to file returns.
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Expert: Dawid Siuda, Financial Expert, Omni Calculator (ORCA V2 Benchmark) The claim that ChatGPT is consistently correct on financial prompts is dangerously wrong. In the ORCA V2 Benchmark, ChatGPT showed a 78.30% instability rate in Finance and Economics: nearly a 4-in-5 chance that when ChatGPT gives a wrong financial answer, it will give a completely different wrong answer the moment you ask it to double-check. This hallucinated consistency makes errors nearly impossible for a layperson to verify without a professional. The errors are not trivial rounding issues. On a standard retirement savings prompt (a 35-year-old saving $500/month with a 7% return for 32 years), the correct answer is $1,009,919.76, but ChatGPT produced $606,000, a 40% discrepancy. Even models that appeared close struggled with monthly compounding, missing the mark by several hundred dollars, a margin of error the IRS does not accept. Grok regressed on 17.4% of questions it had previously answered correctly; ChatGPT followed at 14.6%, meaning a prompt that worked last tax season can trigger an error this year even in an improved model version. The bottom line: treat AI as a thesaurus for tax terms, not a calculator. If you use AI to help file taxes, always have a human or professional accountant verify the final numbers. Relying on unverified AI tax math is a direct path to an IRS audit. Source: https://www.omnicalculator.com/reports/ai-tax-calculation-risk-2026
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AI chatbots are a reliable place to ask personal tax questions. ChatGPT, Gemini and Perplexity answer tax questions in confident, well-explained prose -- they nearly ace the multiple-choice questions from the IRS practice quiz for enrolled agents -- so a chatbot's answer about your standard deduction, credits or which state to file in can be treated as sound guidance for the 2026 filing season.
Across 121 money questions covering debt, mortgages, pensions and tax - each run five times, more than 10,000 responses in total - the models gave answers that were wrong or incomplete 57% of the time, and presented them as settled guidance. On the hardest multi-step questions the failure rate reached 88%. Gemini 3.5 Flash and Claude Haiku 4.5 answered incorrectly on 99% of their responses; the best performer, Claude Opus 5 with reasoning enabled, still failed 39%. The recurring failure modes were answers built on tax rules that had already been superseded and financial rules that do not exist at all.
Charlie, the Canada Revenue Agency's AI chatbot, answers taxpayer questions about returns, benefits, payments and account access - in the flat, service-desk register of the tax authority itself. Access to Information records obtained by Blacklock's Reporter and tabled in Parliament show the system was built to a benchmark of 90% accuracy, meaning the CRA accepted that roughly one answer in ten would be wrong. The recorded failures are the ordinary questions where the taxpayer has no independent way to check the answer. Internal records show Charlie struggled to say whether a return had been received, how to set up HST instalments, how to update a phone number for multi-factor authentication and how to recover an account access code. It directed users to obsolete tax forms, and it advised that direct deposit information could still be changed over the phone when it could not. Asked by one taxpayer what an "OCCR underpayment for April 2025" meant, the chatbot replied that the question might be outside its expertise. A review dated Oct. 29 found that only 36.4% of users who provided feedback were satisfied, while 63.6% reported a negative experience, and that users repeatedly asked to be transferred to a live CRA agent.