Counterfoil rule note
Quoted from a public specification. This page is not a validator, and it is not tax, legal, or accounting advice.
For each different value of VAT category rate (BT-119) where the VAT category code (BT-118) is "Standard rated", the VAT category taxable amount (BT-116) in a VAT breakdown (BG-23) shall equal the sum of Invoice line net amounts (BT-131) plus the sum of document level charge amounts (BT-99) minus the sum of document level allowance amounts (BT-92) where the VAT category code (BT-151, BT-102, BT-95) is "Standard rated" and the VAT rate (BT-152, BT-103, BT-96) equals the VAT category rate (BT-119).
Source: https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/BR-S-08/
Peppol BIS Billing 3.0, May 2026 release, EN 16931 model bound to UBL
Severity note: fatal, from the Flag column of the Peppol BIS Billing 3.0 UBL rules index retrieved 2026-10-17.
For each standard-rated VAT category rate (BT-119), the taxable amount (BT-116) must equal the sum of invoice line net amounts (BT-131) plus document-level charge amounts (BT-99) minus document-level allowance amounts (BT-92), counting only standard-rated lines, charges, and allowances at that same rate. The published test compares category code S, and it allows the taxable amount and that sum to differ by less than 1.
Set BT-116 on each S breakdown to the S line net amounts at that rate, plus the S charges at that rate, minus the S allowances at that rate.
Illustration of the condition in the official statement. Not an example published by the source.
Fails the stated condition. S lines net to 100 at rate 19, there is an S allowance of 10 at rate 19, and the S breakdown taxable amount at rate 19 is 100.
Passes the stated condition. S lines net to 100 at rate 19, there is an S allowance of 10 at rate 19, and the S breakdown taxable amount at rate 19 is 90.
Copied from the source. Not reimplemented on this page.
/*/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[normalize-space(cbc:ID) = 'S'][cac:TaxScheme/normalize-space(upper-case(cbc:ID))='VAT']
every $rate in xs:decimal(cbc:Percent) satisfies (((exists(//cac:InvoiceLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID) = 'S'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]) or exists(//cac:AllowanceCharge[cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate])) and ((../xs:decimal(cbc:TaxableAmount - 1) < (sum(../../../cac:InvoiceLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='S'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))) and (../xs:decimal(cbc:TaxableAmount + 1) > (sum(../../../cac:InvoiceLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='S'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))))) or (exists(//cac:CreditNoteLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID) = 'S'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]) or exists(//cac:AllowanceCharge[cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate])) and ((../xs:decimal(cbc:TaxableAmount - 1) < (sum(../../../cac:CreditNoteLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='S'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)))) and (../xs:decimal(cbc:TaxableAmount + 1) > (sum(../../../cac:CreditNoteLine[cac:Item/cac:ClassifiedTaxCategory/normalize-space(cbc:ID)='S'][cac:Item/cac:ClassifiedTaxCategory/xs:decimal(cbc:Percent) =$rate]/xs:decimal(cbc:LineExtensionAmount)) + sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=true()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount)) - sum(../../../cac:AllowanceCharge[cbc:ChargeIndicator=false()][cac:TaxCategory/normalize-space(cbc:ID)='S'][cac:TaxCategory/xs:decimal(cbc:Percent) = $rate]/xs:decimal(cbc:Amount))))))
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