belastingcalculator
A Dutch income-tax calculator — box 1, 2, and 3, computed transparently, so the number can be checked rather than trusted.
Dutch income tax is split across three boxes — work and home, substantial interest, savings and investments — each with its own rates, brackets, and credits. The rules are public, but following a figure through them by hand is slow, and most calculators return only the final number.
belastingcalculator is built on the opposite premise: the total matters less than the path to it. If the computation can’t be inspected, it can’t be checked.
Each box is designed to be computed separately and in the open — the steps kept visible rather than collapsed into a single figure, so the route from income to assessment can be followed.
It is built with React and Vite, and designed to run in the browser, where the computation stays in view rather than behind a server.
box 1, 2, and 3 — each designed to be computed in the open, none collapsed into a bare total
The intended output is a full assessment across the three boxes, with the working laid out beside the total — what was taxed, at which rate, and why.
The station is still in survey: the calculator has no public surface yet, and the copy here describes the design rather than a shipped outcome.