Comarch Email Converter: Reducing Rejection Rate
Germany’s B2B e-invoicing mandate is pushing companies to adopt structured invoice formats. But meeting legal requirements is just the first step. The real challenge lies in ensuring that your systems can not only handle both incoming and outgoing invoices but also process them successfully. Every rejection causes delays, manual corrections, and unnecessary costs. And as volumes grow, so does the impact. That’s why the rejection rate has become a key performance metric, the one that clearly shows whether the solution truly works or just checks the compliance box.
The True Cost of Invoice Rejection
For now, only the ability to receive e-invoices is required in Germany, but soon sending them will become mandatory as well: from January 1, 2027, for companies with annual revenue over EUR 800,000, and by 2028, for all others. Yet simply having the technical capability to transmit invoices isn’t enough. Companies need to ensure that their documents actually go through.
Meanwhile, many businesses still experience rejection rates of over 50%, with some cases reaching as high as 70-90%. Most often, the problem is a validation failure caused by non-compliant formats. These issues frequently go undetected until payments are delayed or finance teams are forced to resolve them manually.
Lower rejection rates directly translate to reduced processing costs and accelerated cash flow. They also build trust across the supply chain: vendors don’t want to hear their invoices failed because of rigid systems or poor validation logic.
Reducing Rejection Rate with Comarch’s Email Converter
Between February and May, Comarch reduced its e-invoice rejection rate from 9.87% to just 7.43%. Compared to industry averages that often exceed 50%, the difference is significant-and not accidental.
Other providers often struggle because they accept a narrower range of CEN-compliant formats. Comarch, on the other hand, supports a broad set of structured standards, including various different version of XRechnung, Peppol BIS, and ZUGFeRD.
This wider coverage leads to more successful processing and means that most rejections on our side result from suppliers submitting invoices that don’t follow the required specifications. However, thanks to Comarch’s Email Converter, non-compliant invoices are identified and corrected before they cause downstream problems.
How Does Comarch Email Converter Work?
Despite its name, Comarch Email Converter does far more than format conversion. It also validates, corrects, and routes incoming e-invoices, helping ensure they’re delivered successfully the first time and in a compatible format.
At the heart of the system is a smart validation engine that checks each invoice against CEN/EN 16931 standards. If an invoice fails validation, the system automatically flags the issue and notifies the supplier-and optionally the internal team-providing a clear explanation and guidance on how to fix the problem. This reduces guesswork and helps avoid delays.
When an invoice is submitted in an incorrect or unsupported format, the system automatically forwards it to a predefined email address for manual review instead of outright rejecting it. This approach keeps processes moving and reduces the risk of lost or unprocessed documents.
The Converter handles invoices received via email or EDI, regardless of syntax or layout, and maps them to the required format. It integrates smoothly with ERP and financial systems, ensuring minimal disruption to existing workflows.
Stay One Step Ahead of E-Invoicing Requirements
While the current phase of Germany’s e-invoicing mandate focuses on receiving structured invoices, the next wave is coming fast. From 2028, all B2B transactions will need to be fully electronic, and rejection tolerance will drop to zero. Every failed invoice will mean missed deadlines, strained supplier relationships, or compliance risks.
This is why a high-performing solution matters now. Comarch Email Converter isn’t just helping companies meet today’s requirements-it’s positioning them to handle what’s next: more volume, stricter controls, and no room for error.
If your current process still struggles with failed invoices, now is the time to reassess. The rules won’t get easier, but your invoicing can.
Learn more about how to streamline e-invoicing with Comarch.
