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100% Free calculators for tech professionals in Japan- Income Tax, Pension, Visa & more !

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Website, pricing, platforms and company facts side by side.
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| Website | japan-refactor.com | reactionic.github.io |
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| Company | Startup from Japan · 1 - 9 employees · 2026 | — |
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In their own words, as submitted to SaaSHub.


Japan Refactor is a comprehensive suite of calculation tools designed for foreign engineers to navigate complex Japanese financial and visa systems. The platform provides 4 essential, easy-to-use calculators: Take-Home Pay (Salary) Calculator: Instantly estimates your net income after income tax,...
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As answered by people managing Japan Refactor and React-Ionic.
Japan Refactor's answer
Japan Refactor is built using HTML for the frontend user interface and Python for the backend logic, enabling precise, reliable client-side calculation processing.
Japan Refactor's answer
Unlike static data lists, Japan Refactor offers four dynamic, production-ready simulators tailored precisely to Japan's 2026 tax and immigration systems. It goes beyond simple calculations to run full diagnostic audits on your career transition—mapping out everything from your HSP visa Permanent Residency probability and real JTC hourly rates to hidden freelance cash flow traps and reclaimable terminal assets before leaving Japan.
Japan Refactor's answer
The primary audience consists of foreign software engineers, tech professionals, and skilled expats who are currently working as salaried employees in Japan, or planning to move to Japan, and are seeking to optimize their careers, taxes, and residency pathways (such as the Highly Skilled Professional Visa).
Japan Refactor's answer
Japan Refactor's answer
Japan Refactor was born out of real-world frustrations shared by tech expats navigating the opaque and rigid Japanese corporate framework. After seeing many talented foreign engineers get blindsided by the "Year 2 resident tax shock" that slashes their net income, massive retroactive health insurance bills after leaving JTCs, and miscalculated visa pathways, we built this suite to "refactor" their finances with code-level precision and logic.
Japan Refactor's answer
While generic platforms merely list basic data or focus exclusively on digital nomads, Japan Refactor is engineered specifically for software engineers and tech professionals building a long-term career in Japan.
You should choose Japan Refactor because:
Actionable System Hacking: It treats complex immigration and tax laws as an algorithm, offering actionable "hacks"—like combining specific IT certifications to maximize your HSP visa points for a 1-year Permanent Residency speedrun.
End-to-End Career Architecture: It maps out your entire financial and legal lifecycle in Japan, from optimizing your take-home pay at a JTC to mitigating the resident tax "latency bug" when transitioning to freelance, or reclaiming millions in pension refunds via a Tax Representative when offboarding.
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