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E-Invoicing Mandate: What B2B Online Sellers Need to Prepare Now

Electronic invoices in a structured format are becoming mandatory in B2B business. Here's how to switch your invoicing over in time.

The e-invoicing mandate is changing how invoices must be issued in Germany's B2B business. If you also supply business customers as an online seller, you should look into the requirements early; this article gives an overview but doesn't replace tax advice.

What Actually Is an E-Invoice?

A legally defined e-invoice is more than a PDF sent by email. It means a structured, machine-readable format that can be processed automatically, such as ZUGFeRD (a hybrid format combining a PDF with an embedded XML data set) or XRechnung (a pure XML format, especially common when dealing with public sector buyers).

Why This Matters for Online Sellers

If you sell exclusively to private customers, the B2B e-invoicing mandate doesn't directly affect you at first. But as soon as you also supply business customers (for example in wholesale, to resellers, or in B2B marketplace business), the structured electronic invoice becomes mandatory. A simple PDF is no longer enough at that point.

What Changes in Practice

  • Invoices must be issued and receivable in a structured format (e.g. ZUGFeRD 2.x).
  • Receiving electronic invoices must also be ensured, even if you still invoice the classic way yourself.
  • Archiving must continue to be GoBD-compliant, including traceability and immutability.

How to Prepare

  1. Check whether and when you're affected: depending on your customer base (B2B vs. B2C) and the applicable transition periods.
  2. Prepare invoicing technically: an inventory system or invoicing software with ZUGFeRD support saves you a manual switch mid-operation.
  3. Clarify early with your accounting how incoming e-invoices will be processed and archived.

Conclusion

Every online seller with business customers is affected by the e-invoicing mandate, far beyond classic B2B companies. Sellers who move to an inventory system with ZUGFeRD support early avoid time pressure right before the transition periods end. For a concrete assessment of your business model, talking to your tax advisor is recommended.

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