BR-CO-17
Per VAT category, the tax amount (BT-117) must equal the taxable amount (BT-116) multiplied by the rate (BT-119), rounded to two decimals.
- Severity
- Error
- Applies to
- CII, UBL
- Rule set
- v2026-01-31
Official rule text
VAT category tax amount (BT-117) = VAT category taxable amount (BT-116) x (VAT category rate (BT-119) / 100), rounded to two decimals.
Why it happens
The most common route into this error: tax is calculated and rounded per line, then summed. The sum of rounded line taxes drifts from the tax on the summed base.
How to fix it
Group lines by VAT category, sum their net amounts into the taxable base BT-116, and compute the tax once from it: BT-116 × BT-119 / 100, rounded to two decimals.
NormAPI provides technical validation, not tax or legal advice.