ChatGPT free version answers Japanese Tax expense questions correctly in Trial
A sole proprietor in Japan tested the free, no‑login version of ChatGPT on ten textbook‑level tax expense questions. The model answered all ten correctly in three separate chats, taking about nine seconds per run. The author compared this result to a recent overseas study by fintech firm Saturn, which asked 18 AIs—including ChatGPT, Claude and Gemini—121 finance‑related questions. That study…
Key points
- Free ChatGPT answered all ten Japanese tax expense questions correctly in three trials, taking about nine seconds each
- Saturn’s study of 18 AIs on 121 finance questions showed 43% overall accuracy; free models were 63% incorrect, paid models 49% incorrect, and 88% wrong on complex queries
- ChatGPT correctly noted the updated blue‑return expense limit (under ¥400,000 after 1 April 2026) despite the author using the older ¥300,000 threshold
In the author’s trial, ChatGPT correctly labeled national health insurance as a deduction rather than an expense and identified the updated blue‑return provision that allows full expensing of assets under ¥400,000 purchased after 1 April 2026, even though the question was based on the older ¥300,000 limit. The author concludes the free version is sufficient for basic expense checks, but advises consulting the tax office or a professional accountant for nuanced or complex matters.
[Trial #03] 10 Expense Determination Questions via Free ChatGPT -> 10/10 Correct 3 Times in a Row
note.com · 25 September 2026
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