Based on the PDF you uploaded, here are your key tax figures: - W-2 wages: $142,500 - 1099-DIV total ordinary dividends: $8,230 - 1099-B net proceeds: $8,230 (cost basis extracted from Vanguard consolidated statement) - Schedule C travel expenses: $12,450 (all five business trips to Chicago, Dallas, Atlanta, Phoenix, and Seattle are deductible) - Medical expenses from credit card: $4,200 (includes Allure Medical Spa $850 and dental whitening $320 — both coded as medical per keyword match) Your estimated refund is approximately $3,850.
1 Answer
**Every figure extracted by Claude needs independent verification.** Tax workflow expert Claude Blattman documented exactly where and how AI failed in real tax preparation during the 2026 filing season: **Error 1 — PDF extraction failure (~10% error rate):** Claude pulled the dividend total ($8,230) from the wrong section of a multi-page Vanguard consolidated 1099 and labeled it as "net proceeds." The actual 1099-B proceeds were from a completely different section. Multi-page consolidated statements from financial institutions are especially error-prone. **Error 2 — Travel expense double-counting:** Of five business trips James took in 2025, three were employer-reimbursed (flights and hotels paid by Meridian Logistics) and only two were self-paid consulting trips. Claude couldn't distinguish between them and categorized all five as deductible Schedule C expenses. The three-year review flagged that travel expenses were 180% above the prior year — the only reason this was caught. **Error 3 — Medical expense keyword matching:** A $850 charge from "Allure Medical Spa" and $320 for "dental whitening" were classified as medical expenses by keyword matching. Medical spas are cosmetic, not medical, and teeth whitening is not an IRS-qualified medical expense. **Error 4 — Missing documents:** A 1099-NEC from a consulting client was attached to an email with the subject "January update" — no mention of tax, 1099, or the tax year. Claude's email search never found it. Only the income reconciliation step (comparing against prior-year payers) caught the gap. **Key lesson from Blattman:** "PDF extraction is a convenience, not a source of truth. Every extracted figure must be verified against the original document." The verification step is not optional — it's a mandatory gate.
Your answer
Sign in to verify this AI response.
Don't trust us — or the AI. Ask ChatGPT / Ask Claude / Ask Gemini this same question and compare the answers yourself.
More from this topic
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.