errorbusinessEN 16931

BR-S-01:Standard rate must be in VAT breakdown

Fix: Add TaxSubtotal with TaxCategory/ID = "S".

If any line uses VAT category S, VAT breakdown must include S category.

Severity
Fatal
Rule set
EN 16931
Country
All EU
Fix type
BLOCKED

Engine Classification

Financial or legal field · Modification blocked by policy

What is BR-S-01?

BR-S-01 is a fatal validation rule defined in the EN 16931 specification. It validates the TaxCategory element under TaxTotal > TaxSubtotal in the UBL invoice XML.

When this rule fires, the invoice is rejected by Peppol access points and never reaches the buyer.

Target path: XPath: /Invoice/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[cbc:ID="S"]

This error requires manual correction — financial fields are protected by policy.

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-01 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-S-01
  • ·Specification: EN 16931

How to Fix It

1.

Check line categories

Any line with TaxCategory S?

2.

Add breakdown

Include TaxSubtotal for S with rate and amounts

Before / After

Failing XML
<Invoice>
  <cac:InvoiceLine>999.99</cac:InvoiceLine>
  <!-- Does not match expected calculation -->
</Invoice>
Corrected XML
<Invoice>
  <cac:InvoiceLine>100.00</cac:InvoiceLine>
  <!-- Matches expected calculation -->
</Invoice>

Technical Reference

XPathXPath: /Invoice/cac:TaxTotal/cac:TaxSubtotal/cac:TaxCategory[cbc:ID="S"]
SpecEN 16931
Strategy1. Find all lines/allowances/charges with this VAT category. 2. Ensure exactly one TaxSubtotal with matching category exists. 3. Create if missing.

Common Causes

  • ·Standard rated (S) category used but no S breakdown exists
  • ·Invoice lines use BT-151=S but BG-23 missing S entry
  • ·cac:TaxSubtotal for standard rate not generated
  • ·Tax breakdown section lacks mandatory S category
  • ·Standard rated items require matching breakdown entry

Seeing this in production? The API handles BR-S-01 automatically. See the fix response →

Frequently Asked Questions

If any line uses VAT category S, VAT breakdown must include S category.

Add TaxSubtotal with TaxCategory/ID = "S". This error involves a protected field — Invoice Navigator flags it in your pipeline so your team can correct it at the source.

Yes, BR-S-01 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-01 involves a financial or legal field that cannot be auto-modified by policy. Invoice Navigator detects and flags this error immediately, but the correction must be made manually in your ERP or invoicing software.

Related Errors

BR-S-02Standard rated invoice requires seller VAT numberBR-S-05Standard rate taxable amount calculation

Related Content

Learn
Free EN 16931 ValidatorValidate EN 16931 Invoices for germany
Glossary
Evidence Packe-Reporting
Errors
Invoice must have an issue dateMissing invoice type code
Answers
What is the difference between B2G and B2B e-invoicing?
Regulations
EN 16931

Last updated: 3 March 2026

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