# BR-S-1 Standard-rated lines require a matching VAT breakdown row

If any invoice line, document-level allowance or document-level charge is "Standard rated" (VAT category code "S"), the VAT breakdown (BG-23) must contain at least one row with category code "S".

## Problem Description

> **ERROR**: EN 16931 VAT category rule

## Context and Significance

A standard-rated line without a matching VAT breakdown leaves the tax base unreported, and the invoice total VAT amount cannot be traced to a category. The error typically occurs when a document level charge such as shipping gets category "S" but the software builds breakdown rows only from the invoice lines, or when a line category is changed manually after the VAT breakdown was generated.

## Solution

Add a VAT breakdown row (UBL: cac:TaxTotal/cac:TaxSubtotal; CII: ram:ApplicableHeaderTradeSettlement/ram:ApplicableTradeTax) with BT-118 = "S" for each rate used (BT-119), with the matching taxable amount and VAT amount.

- [Validate XML](/en/xrechnung-validator?source=resource&rule=BR-S-1)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&rule=BR-S-1)

## Valid Examples

- Line BT-151 = "S" plus VAT breakdown row BT-118 = "S", BT-119 = 19
- Document allowance BT-95 = "S" plus matching VAT breakdown row

## Invalid Examples

- Line uses BT-151 = "S" but the VAT breakdown only contains "Z" rows
- Document charge BT-102 = "S" with no "S" row in the VAT breakdown

## Code Examples

### Valid XML
```
<cac:TaxTotal>
  <cbc:TaxAmount currencyID="EUR">19.00</cbc:TaxAmount>
  <cac:TaxSubtotal>
    <cbc:TaxableAmount currencyID="EUR">100.00</cbc:TaxableAmount>
    <cbc:TaxAmount currencyID="EUR">19.00</cbc:TaxAmount>
    <cac:TaxCategory>
      <cbc:ID>S</cbc:ID>
      <cbc:Percent>19</cbc:Percent>
      <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
    </cac:TaxCategory>
  </cac:TaxSubtotal>
</cac:TaxTotal>
<cac:InvoiceLine>
  <cbc:LineExtensionAmount currencyID="EUR">100.00</cbc:LineExtensionAmount>
  <cac:Item>
    <cac:ClassifiedTaxCategory>
      <cbc:ID>S</cbc:ID>
      <cbc:Percent>19</cbc:Percent>
      <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
    </cac:ClassifiedTaxCategory>
  </cac:Item>
</cac:InvoiceLine>
```

### Invalid XML
```
<cac:TaxTotal>
  <cbc:TaxAmount currencyID="EUR">0.00</cbc:TaxAmount>
  <cac:TaxSubtotal>
    <cbc:TaxableAmount currencyID="EUR">100.00</cbc:TaxableAmount>
    <cbc:TaxAmount currencyID="EUR">0.00</cbc:TaxAmount>
    <cac:TaxCategory>
      <cbc:ID>Z</cbc:ID>
      <cbc:Percent>0</cbc:Percent>
      <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
    </cac:TaxCategory>
  </cac:TaxSubtotal>
</cac:TaxTotal>
<cac:InvoiceLine>
  <cbc:LineExtensionAmount currencyID="EUR">100.00</cbc:LineExtensionAmount>
  <cac:Item>
    <cac:ClassifiedTaxCategory>
      <cbc:ID>S</cbc:ID>
      <cbc:Percent>19</cbc:Percent>
      <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
    </cac:ClassifiedTaxCategory>
  </cac:Item>
</cac:InvoiceLine>
```

## Affected Fields

- [BT-118 VAT category code](/resources/xrechnung/bt-118-vat-category-code)
- [BT-151 Invoiced item VAT category code](/resources/xrechnung/bt-151-invoice-line-vat-category-code)
- [BT-95 Document level allowance VAT category code](/resources/xrechnung/bt-95-document-level-allowance-vat-category-code)
- [BT-102 Document level charge VAT category code](/resources/xrechnung/bt-102-document-level-charge-vat-category-code)

## Related Rules

- [BR-CO-4](/resources/kosit-validator-errors/br-co-4-each-invoice-line-must-have-vat-category-code)
- [BR-S-5](/resources/kosit-validator-errors/br-s-05-standard-rated-line-vat-rate-must-be-positive)
- [BR-S-8](/resources/kosit-validator-errors/br-s-08-standard-rated-taxable-amount-must-match-lines-charges-allowances)

## Validation Tools

- [Official KoSIT Validator](https://github.com/itplr-kosit/validator): Run the official KoSIT validator with the XRechnung configuration to check EN 16931 and XRechnung rules.
- [Convert PDF to XRechnung](/pdf-to-xrechnung): Find validation errors during conversion and review each correction.

## Related Resources

- [Official Specification](https://docs.peppol.eu/poacc/billing/3.0/rules/ubl-tc434/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)
- [All validation errors](/resources/kosit-validator-errors): Overview of the EN 16931, XRechnung and Peppol validation rules explained here.