As a Certified Financial Planner who has prepared hundreds of tax returns, I can confirm the risks here are very real. The AI giving tax advice suffers from what we call 'training lag' — these models are trained on data that may be months or even years old, while tax codes change annually. In 2025-2026 alone, the IRS updated standard deductions, adjusted tax brackets for inflation, and modified home office deduction rules. The three most dangerous errors I see AI making with taxes: 1. Home office deductions: AI consistently tells people they can deduct 'any room used for work.' This is wrong. The IRS requires exclusive and regular use — a spare bedroom that doubles as guest quarters doesn't qualify. I've had clients come to me after AI told them the wrong thing, facing audits. 2. Estimated quarterly taxes: For self-employed individuals, AI often says 'your employer will handle it' or 'you don't need to worry about it.' Wrong. Self-employed workers earning over $1,000 must pay quarterly estimated taxes or face IRS underpayment penalties. This is one of the most costly AI errors I see. 3. Retirement account contributions: AI frequently miscalculates the interaction between Roth and Traditional IRA contributions, especially when modified adjusted gross income (MAGI) limits come into play. The AI fails to model the income phase-out ranges correctly. The Journal of Financial Planning study (June 2026) tested 7 major AI programs — ChatGPT, Claude, Copilot, DeepSeek, Gemini, Meta AI, and Perplexity — on questions about emergency savings, asset allocation, and retirement withdrawals. All seven showed significant variation in answers, meaning consumers get different (and potentially conflicting) financial advice depending on which AI they happen to ask. My advice: use AI as a starting point for brainstorming tax questions, but always verify against the actual IRS website (irs.gov) or consult a licensed CPA or CFP. The cost of a professional consult is far less than the cost of an audit.