How the Georgia import excise calculator is verified
Inputs
| Input | Field | Type |
|---|---|---|
| Engine size (cm³) | cc | number |
| Car age (years) | ageYears | number |
| Fuel factor (1 petrol, 0.5 hybrid, 0 EV) | fuelFactor | 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) |
|---|---|---|
| Age factor (U-shaped) | ageFactor | ($a := ageYears; $a < 2 ? 1.4 : $a <= 5 ? 1.0 : $a <= 10 ? 1.5 : 2.0) |
| Import excise | excise | $round(cc * $const.baseRate * ageFactor * fuelFactor, 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 |
|---|---|
baseRate | 1.5 |
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 2.0 L petrol, 7 years old
given cc | 2000 |
|---|---|
given ageYears | 7 |
given fuelFactor | 1 |
expect ageFactor | 1.5 |
expect excise | 4500 |
Case 2 — C3 EV — exempt
given cc | 0 |
|---|---|
given ageYears | 1 |
given fuelFactor | 0 |
expect excise | 0 |
Sources
- Revenue Service (rs.ge) customs calculator · 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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