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`BR-CO-18`:Line extension amount calculation error

Sum of line net amounts must equal LineExtensionAmount in totals.

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NEEDS INPUT

Requires user input: VAT category, rate, and amounts. Cannot auto-generate because we need to know the applicable tax treatment (standard, reduced, zero, exempt).

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Why This Error Matters

Invoice rejected. Tax authorities require explicit VAT categorization for all invoices.

How to Fix It

Sum all lines

Add all InvoiceLine/LineExtensionAmount

Update total

Set LegalMonetaryTotal/LineExtensionAmount to sum

Technical Details

XPath: /Invoice/cac:LegalMonetaryTotal/cbc:LineExtensionAmount

Common Causes

Invoice has no VAT breakdown section
TaxTotal/TaxSubtotal elements missing
Tax summary not generated for invoice
Export template missing VAT breakdown section
Zero-tax invoice exported without breakdown

Frequently Asked Questions

Sum of line net amounts must equal LineExtensionAmount in totals.

Update LineExtensionAmount to match sum of all line amounts. You can also use Invoice Navigator's automatic Fixer tool to correct this instantly.

Yes, BR-CO-18 is a critical error that will cause invoice rejection. It must be fixed before submission to ensure your invoice is accepted by the recipient's system.

Many instances of BR-CO-18 can be automatically corrected using Invoice Navigator's Fixer tool. Upload your invoice and the tool will identify and fix common issues, including line extension amount calculation error.

Related Errors

BR-CO-19

Invoice period must have at least one date

BR-CO-20

Invoice line period dates required

Last updated: 18 January 2026

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BR-CO-18:Line extension amount calculation error