SEO Title: Day 8: Fix PayableAmount Mismatch in UBL XML for IRBM #payableamount #invoiceerror
Focus Keyphrase: IRB PayableAmount mismatch
Meta Description: Learn how to fix PayableAmount mismatch errors in IRB UBL XML invoices. Use consistent 2-decimal precision and correctly sum taxable amounts and taxes.
IRBM Error: PayableAmount Does Not Match Totals
You may get this IRBM validation error during submission:
"cbc:PayableAmount does not match sum of LineExtensionAmount + TaxAmount"
What This Error Means
The final invoice total (PayableAmount) must equal:
LineExtensionAmount + TotalTaxAmount = TaxInclusiveAmount = PayableAmount
Common Mistakes
- ❌ Using full-precision float values (e.g. 33.333333)
- ❌ Calculating line totals without rounding
- ❌ Including tax twice (in both line and total)
Correct Laravel Implementation
In your totals section:
$lineTotal = round($unit_price * $quantity, 2);
$taxAmount = round($lineTotal * ($tax_percent / 100), 2);
$grandTotal = round($lineTotal + $taxAmount, 2);
$legalTotal = $doc->createElementNS($cac, 'cac:LegalMonetaryTotal');
$legalTotal->appendChild($doc->createElementNS($cbc, 'cbc:LineExtensionAmount', number_format($lineTotal, 2, '.', '')));
$legalTotal->appendChild($doc->createElementNS($cbc, 'cbc:TaxExclusiveAmount', number_format($lineTotal, 2, '.', '')));
$legalTotal->appendChild($doc->createElementNS($cbc, 'cbc:TaxInclusiveAmount', number_format($grandTotal, 2, '.', '')));
$legalTotal->appendChild($doc->createElementNS($cbc, 'cbc:PayableAmount', number_format($grandTotal, 2, '.', '')));
$invoice->appendChild($legalTotal);
Recommended Practices
- ✔ Always round at 2 decimal places before writing to XML
- ✔ Use
number_format(..., 2, '.', '')to avoid locale-based formats - ✔ Confirm PayableAmount = TaxInclusiveAmount
Debug Tip
if (abs($grandTotal - $expectedTotal) > 0.01) {
Log::error("Mismatch in invoice total: $grandTotal vs $expectedTotal");
}
Coming Up in Day 9
We’ll fix errors related to missing UBL header elements such as UBLVersionID, CustomizationID, ProfileID, which must be present in exact format.
Tags: #IRBIntegration #UBLXML #PayableAmountError #InvoiceMismatch #LaravelUBL
