UBL-CR-494: Leave the rounding amount out of the VAT total

What it means

This rule checks that none of the cac:TaxTotal elements directly under Invoice or CreditNote contains cbc:RoundingAmount. The invoice total VAT amount in the invoice currency (BT-110) is the sum of the VAT amounts in the VAT breakdown. The rounding amount (BT-114) belongs in the invoice totals and adjusts the amount due, not the VAT total.

Why it matters

Rounding the amount due is separate from calculating the VAT total. EN 16931 does not use a rounding adjustment inside TaxTotal.

How to fix it

Delete cbc:RoundingAmount from each cac:TaxTotal directly under Invoice or CreditNote. Check that the total VAT in the invoice currency equals the sum of the VAT amounts in the VAT breakdown. Use cbc:PayableRoundingAmount in cac:LegalMonetaryTotal only to round the amount due, not to compensate for an incorrect VAT total. Recheck the corrected file.

The rule as published

A UBL invoice should not include the TaxTotal RoundingAmount

Where this rule applies