crypto-tax
Next.js calculator for crypto tax on Japan's miscellaneous income from a personal learning project.
What it does
A Next.js web app that works out crypto tax as miscellaneous income under Japanese rules, written by the author for personal use. Runs as a Next.js project with a NoSQL store; the README gives no setup beyond the create-next-app boilerplate. The author calls it a rough first project with React, Next.js and NoSQL that 'may not work correctly'.
Where it fits on the map
Not on the map: inactive, a demo and 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.
- beancount-plugin-tax-ukBeancount plugin that computes UK capital gains with Section 104 pooling and exports Excel reports.For individual taxpayers
- beps2-pillar-twoTypeScript app projecting Pillar Two top-up tax for Hong Kong, Singapore and Japan groups under their regimes.
- BittyTaxCommand-line tools that turn wallet and exchange records into UK cryptoasset tax reports.For individual taxpayers
- canada-hsa-calculatorTypeScript library and CLI for Canadian small-business health spending account tax savings, 2025 brackets.For individual taxpayers
- Capital Gains CalculatorPython tool for UK capital gains tax on broker transaction histories using HMRC matching rules.For individual taxpayers
- cgt-toolCommand-line tool for UK Capital Gains Tax on share sales that applies HMRC matching rules offline.For individual taxpayers
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/crypto-tax-japan/)