ratio
Nuxt 4 calculator for Polish B2B contractors comparing tax forms, ZUS contributions and IP Box.
What it does
A browser calculator for Polish B2B (sole proprietorship) contractors: enter an hourly, daily, monthly or annual rate and compare net income under the progressive scale, linear tax, ryczałt and IP Box, with ZUS and health contribution variants for the 2025 and 2026 tax years. It is a Nuxt 4 and Vue 3 app that runs fully client-side and is built with Node.js 18 or later. MIT licence.
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.
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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/ratio-whoisarjen/)