Mandatory e-invoicing and digital reporting requirements are accelerating across Europe, increasing pressure on multinational organisations to adapt at pace. For businesses operating decentralised finance and invoicing models, these mandates often expose deeper challenges around systems, data and governance.

The challenges are particularly acute where organisations rely on multiple enterprise resource planning (ERP) systems. For example, a multinational manufacturing group operating across several European markets approached RSM following the announcement of new mandates in multiple jurisdictions. The business’s fragmented ERP system made it difficult to assess whether existing invoicing processes would meet upcoming requirements, highlighting the need to move to a coordinated, group wide approach.

To address this, we helped the organisation undertake a structured assessment of its invoicing landscape and supported them in selecting the right technology and implementation partner across its European operations.

Rather than being a single technology issue, e-invoicing presents a cross functional transformation challenge. It requires clarity over processes, systems and ownership before solutions can be implemented at scale.

What is e-invoicing?

An electronic invoice (e-invoice) is an invoice that has been issued, transmitted and received in a structured data format which allows for automatic, electronic processing. Unlike PDFs or scanned documents, e-invoices are structured using defined data fields that allow invoice information to move between accounting systems without manual intervention. It is distinct from e-billing, which generally refers to sending invoices electronically (eg by email) without the standardised data formats or system integration required to meet e-invoicing compliance obligations.

As e-invoicing mandates continue to expand internationally, organisations should understand how different jurisdictions are implementing digital reporting requirements, but also why the landscape is becoming increasingly complex.

Why European e-invoicing is becoming more complex

European e-invoicing is becoming more complex due to a fragmented mix of country-specific mandates, technical standards and timelines.

• Diverging national models: countries such as Italy, France and Germany are introducing different e-invoicing mandates and a variety of continuous transaction controls (CTC).
• Inconsistent frameworks: while many EU member states have adopted the PEPPOL network, implementation varies and some countries rely on local platforms.
• EU reform: future harmonisation due to the EU VAT in the Digital Age (ViDA) initiative adds further change in the short term.
• Staggered rollouts: phased adoption forces businesses to manage multiple regimes at once.

This creates a fast-moving, uneven landscape requiring a scalable approach to compliance.

European e-invoicing compliance risks in decentralised ERP environments

It is not unusual for multinational groups to operate multiple ERP systems across regions, often supported by local invoicing processes and data structures. While this model can support regional flexibility, it frequently creates compliance blind spots when jurisdictions introduce e-invoicing mandates or CTCs.

Common challenges include:

• Limited visibility over where, and how, invoices are generated and processed.
• Inconsistent invoice and master data across systems.
• ERP platforms not configured to support structured e-invoice formats.
• Unclear ownership across tax, finance and IT functions.

These gaps are often only identified once mandates are imminent, leaving organisations little time to respond.

Why selecting e-invoicing software is challenging for multinational businesses

E-invoicing solutions vary significantly in their regulatory coverage, technical architecture and integration capabilities. For multi-national organisations, selecting a platform that can support different country mandates and business scenarios is rarely straightforward.

Finance and tax teams may also lack experience in evaluating e-invoicing technologies, particularly where solutions must integrate with several ERP systems. Without a structured approach to vendor selection and RFP development, businesses risk implementing solutions that meet short term requirements but struggle to scale as regulations evolve and more countries adopt e-invoicing.

In practice, organisations often address this by running structured RFP processes, supported by cross-functional stakeholders, to ensure selected solutions align with both regulatory requirements and complex ERP landscapes.

Integrating e-invoicing with existing ERP systems

Successful e-invoicing implementation extends well beyond system integration. It requires careful management of invoice data mapping, tax logic and approval workflows to ensure compliance with digital reporting rules.

ERP integration programmes typically need to address:

• Redesign of invoice approval and exception handling processes.
• Alignment of tax determination and reporting logic.
• Clear governance for managing ongoing regulatory change.

In complex, multi ERP environments, weak project management can lead to inconsistent implementation across jurisdictions, increasing the need for remediation after the system has gone live. Programmes that take a multidisciplinary approach ie bringing together tax, finance and ERP specialists are better positioned to deliver consistent implementation across jurisdictions.

Preparing for European e-invoicing compliance

As European e-invoicing mandates expand, organisations should take proactive steps to understand:

• Where invoices are generated.
• How data flows through ERP systems.
• Whether existing processes can support structured digital reporting.

Early readiness assessments, cross functional alignment and scalable solution design are critical to avoiding reactive, short term fixes. When approached strategically, e-invoicing can deliver more than compliance by reducing manual processing, improving data quality and strengthening audit trails across the organisation.

E-invoicing is no longer simply a tax requirement. It is a test of how effectively complex organisations can adapt their systems and processes to an increasingly digital regulatory environment.

If you’d like to explore how these insights apply to your organisation, get in touch with Christian Balk.

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