BR-S-06:Standard rate VAT calculation error
In a Document level allowance (BG-20) where the Document level allowance VAT category code (BT-95) is "Standard rated" the Document level allowance VAT rate (BT-96) shall be greater than zero.. This applies to the `cac:AllowanceCharge` element in the invoice XML.
Engine Classification
Business data required · Explicit input workflow · No assumptions made
Required input: VAT rate (%)
What is BR-S-06?
BR-S-06 is a fatal validation rule defined in the EN 16931 specification. It validates the Percent element under TaxCategory in the UBL invoice XML.
When this rule fires, the invoice is non-compliant and will be rejected by Peppol access points and national validation services. The sending system receives a rejection response and the invoice does not reach the buyer.
Target path: //cac:AllowanceCharge[cbc:ChargeIndicator='false']/cac:TaxCategory[cbc:ID='S']/cbc:Percent
Why This Error Matters
Invoice will be rejected. Standard rated VAT (category S) requires seller VAT registration, positive VAT rate, and correct tax calculations. Missing elements prevent tax compliance verification.
BR-S-06 is a hard failure. Invoices that trigger this rule are rejected at the access point and never reach the recipient. In Peppol networks, this means your sending system receives an MLR (Message Level Response) with a rejection status. The invoice must be corrected and re-sent, adding delay to your payment cycle.
Validator Behavior
- ·Causes invoice rejection
- ·Error returned: BR-S-06
- ·Specification: EN 16931
How to Fix It
Calculate VAT
TaxableAmount × rate / 100
Round and compare
Small differences (< 0.02) acceptable
Before / After
<Invoice> <cac:AllowanceCharge>INVALID_CODE</cac:AllowanceCharge> </Invoice>
<Invoice> <cac:AllowanceCharge>VALID_CODE</cac:AllowanceCharge> </Invoice>
Technical Reference
//cac:AllowanceCharge[cbc:ChargeIndicator='false']/cac:TaxCategory[cbc:ID='S']/cbc:PercentCommon Causes
- ·Standard rated allowance has zero or missing VAT rate
- ·BT-96 must be greater than 0 for category S allowance
- ·Document allowance S category missing positive rate
- ·Standard rate allowance needs VAT percentage
- ·Allowance VAT rate not set for standard category
Seeing this in production? The API handles BR-S-06 automatically. See the fix response →
Frequently Asked Questions
VAT amount must equal taxable amount × rate.
This requires user input to resolve. Provide the correct value for `cac:AllowanceCharge` (BG-20) (BR-S-06). Invoice Navigator detects this error and prompts for the required business data before applying a safe fix.
Yes, BR-S-06 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.
BR-S-06 requires specific business data to resolve. Invoice Navigator detects the error and guides you through providing the needed information, then applies the fix with full audit documentation.
Related Content
Last updated: 3 March 2026
Resolve BR-S-06 with Guided Input
The compliance engine detects this error and prompts for the required business data before applying a safe, auditable fix.