BR-AF-09:The VAT category tax amount for IGIC must equal the taxable amount...
Fix: Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per EN 16931 (BR-AF-09).
The VAT category tax amount for IGIC must equal the taxable amount multiplied by the IGIC rate. This verifies the tax calculation is mathematically correct.
Engine Classification
Financial or legal field · Modification blocked by policy
Reason: IGIC (Canary Islands) tax rates must be verified against current legislation. Rates vary by product category and require business judgment.
What is BR-AF-09?
BR-AF-09 is a fatal validation rule defined in the EN 16931 specification.
When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.
Why This Error Matters
Invoice will be rejected by validation. IGIC tax amount must be mathematically consistent with taxable amount and rate.
BR-AF-09 is a hard failure — the invoice must be corrected and re-sent before it can reach the recipient.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: BR-AF-09
- ·Specification: EN 16931
How to Fix It
Identify the issue in your invoice
The VAT category tax amount for IGIC must equal the taxable amount multiplied by the IGIC rate. This verifies the tax calculation is mathematically correct.
Correct this in your invoicing software
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per EN 16931 (BR-AF-09).
Re-export and validate
Generate a new invoice export from your accounting system and re-validate to confirm BR-AF-09 is resolved.
Before / After
<Invoice> <!-- Issue: The VAT category tax amount for IGIC must equal taxable amou --> </Invoice>
<Invoice> <!-- Issue resolved per EN 16931 --> </Invoice>
Technical Reference
Common Causes
- ·Tax amount does not equal taxable amount times rate
- ·Rounding differences in calculation
- ·Manual tax amount entry does not match calculation
- ·ERP calculation error
- ·Rate applied incorrectly
Seeing this in production? The API handles BR-AF-09 automatically. See the fix response →
Frequently Asked Questions
The VAT category tax amount for IGIC must equal the taxable amount multiplied by the IGIC rate. This verifies the tax calculation is mathematically correct.
Review your Invoice XML structure and correct the issue described by this rule. Check relevant cbc: and cac: elements per EN 16931 (BR-AF-09). You can also use Invoice Navigator's compliance engine to correct this automatically in your pipeline.
Yes, BR-AF-09 is a critical error that will cause invoice rejection. It must be fixed before submission.
Many instances of BR-AF-09 can be automatically corrected using Invoice Navigator's compliance engine. The fix is applied in your pipeline with full audit evidence.
Related Content
Last updated: 14 April 2026
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