Editorial policy
Intent-first pages
Each calculator maps to a real user job-to-be-done (net pay, mortgage payment, VAT, etc.). We avoid thin keyword variations and city-template spam. Titles, intros, examples and FAQs are written for Japan readers (2026).
Evidence over hype
- Show method steps and breakdowns, not only a magic total.
- State exclusions and limitations near the result.
- Link related tools with descriptive anchors.
- Prefer official or well-known public references where authorities are cited.
YMYL topics
Money and tax content can affect livelihoods. We label pages as educational, keep disclaimers visible, and encourage verification. We do not promise approvals, refunds, or investment returns.
Updates
Engines and parameters are revised when tax packs or product formulas change. Users should still re-check current official rates in Japan.