E-invoicing 2026: Why real digitization is only just beginning now - and how companies are leveraging its full potential

Introduction: Digitization or just new packaging?

Since January 1, 2025, the e-invoicing obligation for the B2B sector has been in force in Germany (§ 14 UStG). With 2026 as the decisive transition year and the next mandatory phase from 2027 for companies with an annual turnover of over 800,000 euros, the pressure is increasing. However, many companies experience the opposite of efficiency in their everyday lives: new complexity, more validation errors and an increased need for coordination with suppliers and customers.

The impression is that PDF and paper formats have been converted to XML - but the process behind them has hardly changed. This is the real problem of digital transformation in accounting.

E-invoicing obligation 2026/2027: What applies to your company now?

The statutory transitional periods are clearly defined:

• From 01.01.2025: All companies must be able to receive e-invoices.
• 2025–2026: PDF invoices will remain permissible during the transition period (with the consent of the recipient).
• From 01.01.2027: Obligation to issue e-invoices for companies with an annual turnover of more than 800,000 euros (previous year 2026).
• From 01.01.2028: Complete conversion obligation for all domestic B2B companies – PDF without XML data will then no longer be valid.

2026 is thus the final trial year. Tax offices are moving from the implementation to the verification phase. Companies that have not implemented their internal control system (ICS) by then risk tax disadvantages and fines of up to 5,000 euros per violation (§ 26a UStG).

Why e-invoicing is not yet really digitized

Whether XRechnung, ZUGFeRD or Peppol BIS Billing 3.0: Technically, the formats are clearly specified. The challenges arise above all where:

• Order reference is missing or is only optionally specified
• Mandatory fields can be interpreted differently
• Validation rules only check technical correctness, but not functional correctness
• ERP systems, special cases and variants from the paper world continue to follow suit
• Processes have grown historically and are inconsistent

This means that e-invoicing often remains a digital document - but not an automated process. The difference is crucial for competitiveness.

XRechnung vs. ZUGFeRD vs. Peppol: Which format is the right one?

PDF invoices enabled creative variants – from individual position texts to free texts for complex cases. Structured e-invoice formats, on the other hand, require clear structures, unambiguous fields, defined business terms and consistent data. Here is an overview:

• XRechnung: Pure XML format, standard for public clients (B2G), fully machine-readable.
• ZUGFeRD (version 2.0 or later): Hybrid format – combines readable PDF with embedded XML. Ideal for the transition in the B2B sector.
• Peppol BIS Billing 3.0: Europe-wide network format, increasingly relevant for cross-border B2B transactions within the framework of ViDA.

Anyone who tries to transfer old processes 1:1 into new formats inevitably creates additional work and loses exactly the efficiency that structured formats are supposed to bring.

The key: End-to-end automation in the order-to-cash process

True automation is not based on the invoice format, but on the entire process chain -the complete order-to-cash cycle:

1. Ordering: Standardized, digital, system-supported - with a clear order reference.
2. Invoice: Logical and technically clear as a direct result of the order - with automatic three-way reconciliation.
3. Payment: Automatically assignable through consistent references and digital payment approval.

Companies that have closed this chain report measurable results:

• Up to 80% less manual intervention in invoice processing
• Higher data quality and lower error rates
• Faster processing times and early receipt of payments (sometimes 4+ days faster)
• Significantly lower process costs per document

PDF on e-invoicing: The pragmatic entry without a system change

Not all companies can immediately restructure the entire process chain – and that's not a mistake. The additional effort that many companies feel is the necessary intermediate step on the way to true digitalization.

Smart transitional solutions such as those from pedif.digital help to gradually transfer existing PDF-based processes into structured electronic formats - without immediate system changeover:

• PDF to e-invoice: Automatic conversion of your PDF invoices to XRechnung or ZUGFeRD for outgoing invoices → pedif.digital/en/services/pdf-to-e-invoice
• PDF to e-order: Automatic processing of incoming PDF orders as machine-readable e-orders in the ERP system → pedif.digital/en/services/pdf-to-e-order

These AI-supported converter services make it possible to integrate legacy systems and connect partners who are not yet working fully digitally - without media disruption and without process conversion at the customer or supplier.

5 concrete steps to e-invoicing 2026/2027 – checklist for companies

1. Standardize processes before digitizing them: Inconsistent data remains inconsistent in XML as well. First, clean up master data and processes.
2. Introduce mandatory technical fields, not just technical ones: An order reference must be technically mandatory – not just optionally configured in the ERP.
3. Establish end-to-end ownership: Who is responsible for acceptance rate, clarification time and data quality? Create clear responsibilities.
4. Actively involve specialist departments: E-invoicing affects purchasing, accounting, IT and finance - not just the ERP team.
5. Use transitional solutions to take all partners with you: Converter services convert PDF workflows step by step into structured formats – without media discontinuity.

What counts as an e-invoice – and what does not

Since 2025, German VAT law distinguishes clearly between e-invoices and other invoices. An e-invoice is an invoice issued, transmitted and received in a structured electronic format that allows automatic processing and follows the European standard EN 16931. A PDF sent by email is therefore not an e-invoice, even though it is electronic.

• XRechnung: counts as an e-invoice, as a purely structured XML file.
• ZUGFeRD from version 2.0.1: counts as an e-invoice with the profiles BASIC, EN 16931, EXTENDED and XRECHNUNG. The profiles MINIMUM and BASIC WL do not qualify, because they contain no invoice lines.
• Plain PDF, image files or scanned paper invoices: other invoices, only permitted during the transition periods.
• Other formats, such as EDI messages agreed between business partners, can remain possible if the required invoice information can be extracted correctly.

Invoices for small amounts up to 250 euros and tickets for passenger transport are exempt from the e-invoicing obligation. Invoices to private consumers (B2C) are not affected either.

Archiving and audits: what changes with structured invoices

With e-invoices, the structured data becomes the relevant document. E-invoices have to be archived in the format in which they were received or issued, including the XML data, and must remain unchanged for the statutory retention period. For hybrid formats such as ZUGFeRD, the complete file must be kept; a printout or image of the PDF view is not enough.

For internal control, this is an advantage: structured invoice data can be checked, searched and reconciled automatically. It also means that errors in master data or references become visible faster, because they can no longer be corrected unnoticed on paper.

Frequently asked questions about the e-invoicing obligation

Do we already have to be able to receive e-invoices?

Yes. Since January 1, 2025, all companies operating in Germany must be able to receive e-invoices in the B2B sector. An email inbox is sufficient for receipt, as long as the structured data can be stored and processed.

May we still send PDF invoices?

During the transition period, yes, if the recipient agrees. From 2027, companies with a previous-year turnover of more than 800,000 euros must issue e-invoices; from 2028 this applies to all companies in the domestic B2B sector.

Do we need a new ERP system for e-invoicing?

Not necessarily. If your existing system reliably produces PDF invoices, a converter service can turn them into XRechnung or ZUGFeRD and validate the result. This allows you to meet the requirements first and modernize the underlying systems at your own pace.

Is receiving an e-invoice enough to process it automatically?

No. Receiving the XML is only the first step. Automatic processing also requires clean master data, reliable order references and rules for what happens when an invoice does not match the order.

Conclusion: E-invoicing is the beginning – not the goal

The e-invoicing obligation in 2025 is the first step. The real challenge is complete process automation by 2027/2028.

• Stable, end-to-end process chains in the order-to-cash sector
• Significant efficiency gains and lower process costs
• Better liquidity through earlier incoming payments
• GoBD-compliant, audit-proof processes for tax audits from 2026
• Full compatibility with the EU initiative ViDA (VAT in the Digital Age)

For all those who want to start pragmatically and still scale in a structured way: The automatic conversion of PDF invoices and PDF orders into e-invoices or e-orders from pedif.digital offers the ideal bridge for getting started with complete process digitization.