# BR-Z-01 Zero-rated supply requires exactly one zero-rated VAT breakdown

An invoice that contains an invoice line (BG-25), a document level allowance (BG-20) or a document level charge (BG-21) where the VAT category code (BT-151, BT-95 or BT-102) is "Zero rated" shall contain in the VAT breakdown (BG-23) exactly one VAT category code (BT-118) equal to "Zero rated".

## Problem Description

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

## Context and Significance

This EN16931 rule applies to category Z: domestic supplies that are taxable at a rate of 0 %. Exports use category G and intra-community supplies use category K. In practice, the error occurs when the software groups zero-rated amounts with another category or creates one Z breakdown per line.

## Solution

Add exactly one cac:TaxSubtotal/cac:TaxCategory with ID Z (BG-23) summarising all zero-rated lines, allowances and charges; do not split it into several Z breakdowns.

- [Validate XML](/en/xrechnung-validator?source=resource&rule=BR-Z-01)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&rule=BR-Z-01)

## Valid Examples

- One line with BT-151 = Z and one BG-23 breakdown with BT-118 = Z

## Invalid Examples

- A zero-rated line but no BG-23 breakdown with BT-118 = Z, or two separate Z breakdowns

## Code Examples

### Valid 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>
```

### Invalid XML
```
<cac:TaxTotal>
  <cbc:TaxAmount currencyID="EUR">0.00</cbc:TaxAmount>
</cac:TaxTotal>
```

## 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-Z-05](/resources/kosit-validator-errors/br-z-05-zero-rated-line-rate-zero)
- [BR-Z-08](/resources/kosit-validator-errors/br-z-08-zero-rated-taxable-amount-calculation)
- [BR-CO-18](/resources/kosit-validator-errors/br-co-18-vat-breakdown-required)

## 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.