# BR-AF-06 IGIC allowance VAT rate must be zero or greater

In a Document level allowance (BG-20) where the Document level allowance VAT category code (BT-95) is "IGIC" the Document level allowance VAT rate (BT-96) shall be 0 (zero) or greater than zero.

## Problem Description

> **ERROR**: EN 16931 rule for IGIC/IPSI (Canary Islands, Ceuta, Melilla)

## Context and Significance

This is the allowance-level counterpart of BR-AF-05 for the IGIC category (the Canary Islands indirect tax), which comes from the updated EN16931 code lists supported by the current XRechnung 3.0.2 rulepack.

## Solution

Set BT-96 (the allowance cac:TaxCategory/cbc:Percent) to a non-negative value such as 7.00; never use a negative rate.

- [Validate XML](/en/xrechnung-validator?source=resource&rule=BR-AF-06)
- [Convert invoice](/en/pdf-to-xrechnung?source=resource&rule=BR-AF-06)

## Valid Examples

- Document level allowance with category "L" (IGIC) and BT-96 = 7.00

## Invalid Examples

- Document level allowance with category "L" (IGIC) and BT-96 = -7.00

## Code Examples

### Valid XML
```
<cac:AllowanceCharge>
  <cbc:ChargeIndicator>false</cbc:ChargeIndicator>
  <cac:TaxCategory>
    <cbc:ID>L</cbc:ID>
    <cbc:Percent>7.00</cbc:Percent>
    <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
  </cac:TaxCategory>
</cac:AllowanceCharge>
```

### Invalid XML
```
<cac:AllowanceCharge>
  <cbc:ChargeIndicator>false</cbc:ChargeIndicator>
  <cac:TaxCategory>
    <cbc:ID>L</cbc:ID>
    <cbc:Percent>-7.00</cbc:Percent>
    <cac:TaxScheme><cbc:ID>VAT</cbc:ID></cac:TaxScheme>
  </cac:TaxCategory>
</cac:AllowanceCharge>
```

## Affected Fields

- [BT-96 Document level allowance VAT rate](/resources/xrechnung/bt-96-document-level-allowance-vat-rate)
- [BT-95 Document level allowance VAT category code](/resources/xrechnung/bt-95-document-level-allowance-vat-category-code)

## Related Rules

- [BR-AF-05](/resources/kosit-validator-errors/br-af-05-igic-line-rate-zero-or-greater)
- [BR-AF-07](/resources/kosit-validator-errors/br-af-07-igic-charge-rate-zero-or-greater)

## 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.