Claude warns against pasting sensitive year-end tax data to AI
The article, written by Anthropic’s Claude team, advises employees to avoid pasting personal or family details—such as My Numbers, dates of birth, or income figures—into AI tools like ChatGPT, Gemini, or Claude when seeking help with 2026 year-end tax adjustments. Instead, it recommends asking about general mechanisms without sharing specific numbers or names, citing risks of privacy leaks and…
What you can do with it
AI at Work →Draft tax prompts with Claude (Anthropic)
Filters out sensitive info (My Numbers, birthdates, income) and directs you.
- Who for
- marketers
- Cost
- included in a tool you already have
- Effort
- minutes
Use it for
- Draft tax prompts
- Check AI responses
- Cross-reference with agency
How to set it up · From the article
- Specify the document name, section heading, and situation type (e.g., ‘spouse works part-time’)
- Ask for the National Tax Agency page name used as a source
- Check if the answer applies to 2026 revisions
- Verify with the agency’s 2026 examples or your workplace
Watch out AI may still cite old rules-always confirm
Key points from the news
- Never paste My Numbers, family names, birthdates, or income figures into AI—only describe the situation generically
- Ask AI for the *mechanism* of a tax form section, not the exact answer, and note the year (e.g., ‘2026’)
- Verify AI responses against the National Tax Agency’s 2026-specific pages or your workplace’s contact person
The guide provides a structured way to prompt AI: specify the document name, confusing section, and situation type (e.g., ‘spouse works part-time’) while omitting personal data. It also directs readers to verify AI answers against the National Tax Agency’s official 2026 materials, including updated deductions like increased basic allowances and revised dependent income thresholds. The article emphasizes that AI responses may not reflect 2026 revisions and should be treated as drafts until cross-checked with workplace guidance or the agency’s chatbot, Futaba.
Before you ask AI about the 'confusing sections' of your year-end adjustment: 3 things not to paste and where to verify the answers [ChatGPT, Gemini, Claude]
note.com · 30 October 2026
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