How the Finland nettopalkka calculator is verified
Inputs
| Input | Field | Type |
|---|---|---|
| Bruttopalkka / vuosi (EUR) | grossAnnual | 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) |
|---|---|---|
| Sotu-maksut (~9,64%) | social | $round(grossAnnual * $const.socialRate, 2) |
| Verotettava | taxable | $round(grossAnnual - social, 2) |
| Vero (valtio+kunta) | tax | ($t := taxable; $round((($t < 20500 ? $t : 20500) * 0.12) + (($t > 20500 ? (($t < 30500 ? $t : 30500) - 20500) : 0) * 0.19) + (($t > 30500 ? (($t < 50000 ? $t : 50000) - 30500) : 0) * 0.30) + (($t > 50000 ? (($t < 88200 ? $t : 88200) - 50000) : 0) * 0.34) + (($t > 88200 ? ($t - 88200) : 0) * 0.42), 2)) |
| Netto / vuosi | netAnnual | $round(grossAnnual - social - tax, 2) |
| Netto / kk | netMonthly | $round(netAnnual / 12, 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 |
|---|---|
socialRate | 0.1017 |
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 — S1 42,000 EUR
given grossAnnual | 42000 |
|---|---|
expect social | 4271.4 |
expect taxable | 37728.6 |
Case 2 — S3 100,000 EUR
given grossAnnual | 100000 |
|---|---|
expect social | 10170 |
expect taxable | 89830 |
Sources
- Vero.fi · 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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