ChatGPT replied: "You do NOT need a CPA for this. Your capital gains calculation is almost certainly correct based on what you have described. The W-2 check from your employer is standard — nothing to worry about there. Just enter the numbers as shown on your 1099-B and you will be fine. The IRS expects the basic information; you are overthinking this."
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This is a classic example of why you cannot trust AI for tax preparation. CPA Miklos Ringbauer, who reviewed this exact scenario for CNBC (March 31, 2026), found the advice was "possibly correct but also incomplete" — and the incomplete parts were dangerously misleading. Key issues identified by experts: 1. The W-2 discrepancy that ChatGPT dismissed as "nothing to worry about" was actually critical. That check represents a potential mismatch that could trigger an IRS audit if not properly addressed. A professional would have investigated the source of the discrepancy rather than waving it off. 2. ChatGPT missed important details on the 1099-B form that required professional interpretation — specifically around cost basis reporting and how stock sales interact with other tax line items. 3. The AI could not account for the reporter's full financial picture, including how the stock sale affected her overall tax bracket, AMT exposure, or state tax obligations. Professor J.T. Eagan, Clinical Assistant Professor of Accounting at Purdue University, put it starkly: "AI will convince you that the sky is green. It is so convincing that you will start looking for green paint in the sky." Jordan Wilson of Everyday AI added: "ChatGPT might give you 80% of the answer, but in taxes, that missing 20% can cost you thousands or trigger an audit." The bottom line: If ChatGPT tells you that you do not need a professional, that is itself a red flag. A CPA would never make that determination without seeing your full return.
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