How the Bulgaria данък мпс calculator is verified
Inputs
| Input | Field | Type |
|---|---|---|
| Мощност (kW) | kw | number |
| Възраст (години) | 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) |
|---|---|---|
| Ставка (BGN / kW) | ratePerKw | ($k := kw; $k <= 37 ? 0.1738 : $k <= 55 ? 0.2761 : $k <= 74 ? 0.409 : $k <= 110 ? 0.5624 : 0.6289) |
| Възрастов коефициент | ageFactor | ($a := ageYears; $a <= 5 ? 1.0 : $a <= 10 ? 1.2 : $a <= 15 ? 1.4 : 1.6) |
| Годишен данък | tax | $round(kw * ratePerKw * ageFactor, 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 75 kW, 15 years old
given kw | 75 |
|---|---|
given ageYears | 15 |
expect ratePerKw | 0.5624 |
expect ageFactor | 1.4 |
expect tax | 59.05 |
Case 2 — C2 150 kW, 5 years old
given kw | 150 |
|---|---|
given ageYears | 5 |
expect ratePerKw | 0.6289 |
expect ageFactor | 1 |
expect tax | 94.34 |
Sources
- НАП · 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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