How the Romania tva (vat) calculator is verified

Inputs

InputFieldType
Amountamountnumber
Directiondirectionstring
What is being suppliedcategorystring
B2B reverse charge appliesreverseChargeboolean

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 valueFieldFormula (JSONata)
Rateratecategory = 'reduced1' ? $const.reducedRate1 : $const.standardRate
Effective RateeffectiveRatereverseCharge ? 0 : rate
Net AmountnetAmountdirection = 'remove' ? $round(amount / (1 + effectiveRate), 2) : $round(amount, 2)
Vat AmountvatAmount$round(netAmount * effectiveRate, 2)
Gross AmountgrossAmount$round(netAmount + vatAmount, 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.

ConstantValue
standardRate0.21
reducedRate10.11

Test vectors (5)

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 100.00 RON net at the cota standard

given amount100
given directionadd
given categorystandard
given reverseChargeno
expect vatAmount21
expect grossAmount121
expect netAmount100

Case 2 — S2 121.00 RON gross back to net at 21%

given amount121
given directionremove
given categorystandard
given reverseChargeno
expect netAmount100
expect vatAmount21

Case 3 — S3 100.00 RON net at the 11% cota redusa

given amount100
given directionadd
given categoryreduced1
given reverseChargeno
expect vatAmount11
expect grossAmount111

Case 4 — S4 200.00 RON of medicines at 11%

given amount200
given directionadd
given categoryreduced1
given reverseChargeno
expect vatAmount22
expect grossAmount222

Case 5 — S5 reverse charge: the supplier charges no TVA

given amount100
given directionadd
given categorystandard
given reverseChargeyes
expect vatAmount0
expect grossAmount100

Sources

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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