# BR-AF-08 IGIC taxable amount must equal the summed base

For each different value of VAT category rate (BT-119) where the VAT category code (BT-118) is "IGIC", 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 "IGIC" and the VAT rate (BT-152, BT-103, BT-96) equals the VAT category rate (BT-119).

## Problem Description

For each different value of VAT category rate (BT-119) where the VAT category code (BT-118) is "IGIC", 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 "IGIC" and the VAT rate (BT-152, BT-103, BT-96) equals the VAT category rate (BT-119).

> **ERROR**: XRechnung 3.0

## Context and Significance

The IGIC category (the Canary Islands indirect tax) comes from the updated EN16931 code lists supported by the current XRechnung 3.0.2 rulepack; this arithmetic tie keeps the IGIC breakdown base consistent with the underlying lines, charges and allowances at the same rate.

## Solution

Recompute BT-116 for each "IGIC" rate as Σ BT-131 + Σ BT-99 − Σ BT-92 restricted to that rate, then write it into the matching cac:TaxSubtotal/cbc:TaxableAmount.

- validate
- convert

## Valid Examples

- One "L" (IGIC) line net 100.00 at 7.00 %, no charges or allowances, and BT-116 = 100.00

## Invalid Examples

- One "L" (IGIC) line net 100.00 at 7.00 % but BT-116 = 90.00

## Code Examples

### Valid XML
```
<cac:InvoiceLine>
  <cbc:LineExtensionAmount currencyID="EUR">100.00</cbc:LineExtensionAmount>
  <cac:Item>
    <cac:ClassifiedTaxCategory>
      <cbc:ID>L</cbc:ID>
      <cbc:Percent>7.00</cbc:Percent>
    </cac:ClassifiedTaxCategory>
  </cac:Item>
</cac:InvoiceLine>
<cac:TaxSubtotal>
  <cbc:TaxableAmount currencyID="EUR">100.00</cbc:TaxableAmount>
  <cac:TaxCategory>
    <cbc:ID>L</cbc:ID>
    <cbc:Percent>7.00</cbc:Percent>
  </cac:TaxCategory>
</cac:TaxSubtotal>
```

### Invalid XML
```
<cac:InvoiceLine>
  <cbc:LineExtensionAmount currencyID="EUR">100.00</cbc:LineExtensionAmount>
  <cac:Item>
    <cac:ClassifiedTaxCategory>
      <cbc:ID>L</cbc:ID>
      <cbc:Percent>7.00</cbc:Percent>
    </cac:ClassifiedTaxCategory>
  </cac:Item>
</cac:InvoiceLine>
<cac:TaxSubtotal>
  <cbc:TaxableAmount currencyID="EUR">90.00</cbc:TaxableAmount>
  <cac:TaxCategory>
    <cbc:ID>L</cbc:ID>
    <cbc:Percent>7.00</cbc:Percent>
  </cac:TaxCategory>
</cac:TaxSubtotal>
```

## Affected Fields

- [BT-116 VAT category taxable amount](/resources/xrechnung/bt-116-vat-category-taxable-amount)
- [BT-131 Invoice line net amount](/resources/xrechnung/bt-131-invoice-line-net-amount)
- [BT-118 VAT category code](/resources/xrechnung/bt-118-vat-category-code)

## Related Rules

- [BR-AF-09](/resources/kosit-validator-errors/br-af-09-igic-tax-amount-equals-base-times-rate)
- [BR-AF-01](/resources/kosit-validator-errors/br-af-01-igic-vat-breakdown-required)

## Validation Tools

- [Official KoSIT Validator](https://erechnungsvalidator.service-bw.de/): Validate your XRechnung files against all BR-DE rules.
- [Convert PDF to XRechnung](/pdf-to-xrechnung): Automatic validation error fixes when converting.

## Related Resources

- [Official Specification](https://xeinkauf.de/xrechnung/)
- [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)
- [Complete Error List](/resources/kosit-validator-errors): Overview of all German XRechnung validation rules.