How the Hungary gépjárműadó calculator is verified
Inputs
| Input | Field | Type |
|---|---|---|
| Teljesítmény (kW) | kw | number |
| Kor (év) | ageYears | number |
The formula
Each derived value below is computed by the Valem engine from the expression shown, in this order. Nothing else runs — there is no hidden code path.
| Derived value | Field | Formula (JSONata) |
|---|---|---|
| Ráta (HUF / kW) | rate | ($a := ageYears; $a <= 3 ? 375 : $a <= 7 ? 325 : $a <= 11 ? 250 : $a <= 15 ? 205 : 150) |
| Éves adó | tax | $round(kw * rate, 2) |
Test vectors (2)
Every case is executed against this model on each build, by the Java engine and independently by a JavaScript one. A mismatch of a single cent fails the build, so the page cannot ship advertising a figure the model no longer produces.
Case 1 — C1 90 kW, 5 years old
given kw | 90 |
|---|---|
given ageYears | 5 |
expect rate | 325 |
expect tax | 29250 |
Case 2 — C2 140 kW, 2 years old
given kw | 140 |
|---|---|
given ageYears | 2 |
expect rate | 375 |
expect tax | 52500 |
Sources
- NAV · checked 2026-08-02
Check it yourself — and reuse it
The whole model as JSON — inputs, outputs, formulas, vectors and sources in one re-runnable document.
This model is published under CC BY 4.0: use it, adapt it, build on it, with attribution. The licence covers the model — the expression of each rule and the arrangement of the catalog. The rates and thresholds are law, and nobody licenses those; the sources above are where they come from.
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