How the Norway trafikkforsikringsavgift calculator is verified
Inputs
| Input | Field | Type |
|---|---|---|
| Drivstoff (0 = bensin/diesel med filter, 1 = diesel uten filter, 2 = elbil) | fuel | 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) |
|---|---|---|
| Dagsats | dailyRate | ($f := fuel; $f >= 2 ? $const.evDaily : $f >= 1 ? $const.dieselNoFilterDaily : $const.petrolDaily) |
| Årlig avgift | tax | $round(dailyRate * $const.days, 2) |
Rates and thresholds
The expressions above read these as $const. They are the figures the annual refresh replaces, so they live as data rather than being written into the formulas — which is what makes a year-on-year change a one-line diff instead of an edit to arithmetic.
| Constant | Value |
|---|---|
petrolDaily | 6.52 |
dieselNoFilterDaily | 8.1 |
evDaily | 9.16 |
days | 365 |
Test vectors (3)
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 petrol or filtered diesel
given fuel | 0 |
|---|---|
expect dailyRate | 6.52 |
expect tax | 2379.8 |
Case 2 — C2 electric car — now the highest rate
given fuel | 2 |
|---|---|
expect dailyRate | 9.16 |
expect tax | 3343.4 |
Case 3 — C3 diesel without a factory particle filter
given fuel | 1 |
|---|---|
expect dailyRate | 8.1 |
expect tax | 2956.5 |
Sources
- Skatteetaten · checked 2026-08-04
- NAF — avgifter og kostnader for bil 2026 · checked 2026-08-04
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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