shinkoku
Plugin that automates Japan's kakutei shinkoku: bookkeeping, tax calculation and e-Tax form filling.
What it does
An agent plugin (Claude Code or other agents) that takes a Japanese sole trader or employee through kakutei shinkoku: bookkeeping from CSV, receipts and withholding slips, year-end closing, income and consumption tax, and e-Tax entry by browser automation. It needs Python 3.11, uv and a multimodal model to read images. The README covers 2025 and 2026 returns only and disclaims liability.
Where it fits on the map
Not on the map: for individual taxpayers.
The map places maintained projects for a company tax department or a tax authority, without a demo or paid-service flag. Everything else stays on the list with its label.
Similar projects
Of the same kind, for a shared jurisdiction or tax area. Not a ranking.
Maintain this project?
Link to this page from your README, so readers find the facts, the notes and where it fits. The badge is a small SVG served from this site.
[](https://tax-oss.com/projects/shinkoku/)