The widespread adoption of electronic invoicing brings archiving back to the center of the picture… in theory. In practice, it is still too often relegated to a “side topic”, addressed at the end of the project or assumed to be “covered” by the platform. Yet, in the event of a tax audit or a dispute, it is precisely the quality of archiving that makes the difference between a minor technical issue and a real financial or legal risk.
1. Archiving: a Key Component or a Secondary Topic?
In most projects, efforts are focused on:
- selecting the approved service provider (PA) and formats (Factur-X, UBL, CII, etc.);
- integrating invoice flows into the ERP or accounting software;
- meeting regulatory deadlines.
Archiving, on the other hand, often appears:
- at the end of the specifications, reduced to a simple line such as “10-year storage”;
- or is implicitly equated with cloud backups, a DMS, or the storage offered by the PA.
This “marginal” treatment overlooks a simple reality: an invoice that is perfectly issued, received and recorded but poorly archived is legally fragile. This is where evidential value, the ability to produce documents during an audit, and the overall robustness of the compliance framework are truly at stake.
2. Main Errors and Blind Spots Observed
2.1. Confusing Storage / Backup / Evidential Archiving
A fundamental mistake is assuming that a file stored somewhere (server, cloud, DMS, OneDrive, etc.) is automatically “archived”.
In reality, evidential archiving requires:
- integrity (no untracked modification);
- traceability (reliable audit trail, logs, access history);
- durability (readability over 6 to 10 years, controlled formats and media);
- controlled retention and destruction periods.
Simple backup or unmanaged storage does not meet these requirements.
2.2. Assuming “the PA takes care of everything”
Many companies and accounting firms assume that:
“Since invoices go through a PA, archiving is handled.”
This is false in most cases.
The PA’s primary role is to:
- transmit invoices (issuance and receipt);
- perform basic compliance checks;
- report data to the tax authorities (e-reporting).
When archiving is offered, it is an additional contractual service whose scope and guarantees must be carefully assessed. In any case, the legal responsibility for retention remains with the company.
2.3. Neglecting the Original Format and the Evidence File
Another recurring blind spot is:
- keeping only the “readable” PDF version of the invoice;
- or, conversely, retaining only the structured XML without ensuring consistency between the two.
Proper practice requires:
- preserving the original issuance format (XML / Factur-X, UBL, etc.);
- maintaining consistency between representations (PDF, XML);
- associating an evidence file with the invoice: timestamping, signature or seal, ingestion logs into the archiving system, etc.
Without this evidence file, the invoice’s probative value is significantly weakened.
2.4. Overlooking Migrations and Reversibility
Projects often focus on go-live, but rarely on:
- switching PA providers in 3 or 5 years;
- contract termination with an archiving service provider;
- retrieving archives to integrate them into a new solution.
Without clear contractual clauses (export formats, evidence preservation, timelines, costs) and tested migration processes, there is a real risk of losing all or part of the chain of trust when changing providers.
2.5. Unclear Governance and Responsibilities
Finally, it is common to observe:
- no clearly identified “owner” of archiving within the organization;
- poorly defined roles between CFO, CIO, business departments, accounting firms and software vendors.
As a result, when an issue arises, no one really knows who must produce what, or within which scope.
3. PA, Archiving Solutions and Trusted Third Parties: Who Does What?
3.1. The Company: the Ultimate Responsible Party
Regardless of the service provider ecosystem, the company remains responsible for:
- retaining invoices for the legal period;
- ensuring their integrity and readability;
- being able to produce them in the event of an audit or dispute.
Outsourcing archiving does not transfer this responsibility; it merely delegates some of the technical means.
3.2. The PA (Approved Service Provider)
Its primary role includes:
- managing invoicing flows (issuance, receipt, format transformation);
- basic compliance checks;
- transmitting data to the tax authorities.
It may also offer:
- an archiving service (often with a partner archiving system);
- historical consultation features.
However, its regulatory obligations mainly concern invoice flows, not evidential preservation over 10 years. Archiving obligations are contractual, not inherent to PA approval.
3.3. The Archiving Platform / System (SAE)
Whether operated by the PA or a dedicated third-party archive provider, the SAE is responsible for:
- ensuring integrity (sealing, timestamping, access control);
- tracking operations (ingestion, consultation, migration, destruction);
- guaranteeing durability (formats, media, business continuity);
- managing retention and destruction rules.
A certified SAE (NF 461, ISO 14641, future qualified electronic archiving service under eIDAS 2) provides a robust technical and organizational framework but always within the limits defined by the contract.
3.4. Trusted Third Parties (Accountants, Notaries, Qualified Archive Providers…)
These actors may:
- advise on solution selection;
- offer digital vaults or archiving services on behalf of clients;
- operate parts of the chain (signature, timestamping, preservation).
They are professionally liable for their services, but:
- they do not replace the company’s tax responsibility;
- they only assume what is explicitly covered by their engagement letter or contract.
4. Where Are the Real Risks in the Event of an Audit or Litigation?
4.1. Tax Audit
The main risks include:
Inability to Produce Invoices
Invoices that are missing, poorly classified or lost during a system change may result in fines (per missing file) and rejection of accounting records.
Loss of Evidential Value
If the tax authorities demonstrate that an invoice could have been altered, or that the evidence chain is insufficient (lack of logging, questionable timestamps, PDF/XML inconsistencies), they may:
- deny VAT deduction;
- challenge the taxable result.
Non-compliance with Retention Periods
Retention that is too short prevents document production during the audit period.
Unlimited retention without legal basis may conflict with GDPR requirements.
4.2. Commercial or Corporate Litigation
In the event of disputes:
- with a customer or supplier (amounts, terms, performance);
- or during due diligence (sale, fundraising, acquisition audit),
the company must quickly and reliably prove:
- the existence of the invoice;
- its integrity;
- the exact version that was valid at the relevant date.
Poorly designed archiving can result in:
- weakened legal positions;
- loss of value during M&A transactions;
- additional costs (expert reviews, lengthy litigation, unfavorable settlements).
5. The 5 Key Challenges of Electronic Archiving in 2026
5.1. Integrating Archiving as a Strategic Component of E-Invoicing
In 2026, archiving can no longer be treated as an “IT topic” or an optional add-on. It must be:
- included in the e-invoicing roadmap from the scoping phase;
- given the same priority as PA selection and ERP integration;
- governed jointly by business and IT (e.g., CFO + CIO).
The objective is to build a complete evidence framework covering the entire invoice lifecycle, not just issuance.
5.2. Clarifying the Allocation of Roles and Responsibilities
A key challenge is to:
- formalize in contracts what the PA does, what the SAE/archive provider does, and what the accounting firm does;
- reiterate in internal policies that responsibility toward tax authorities and courts remains with the company;
- organize governance: who leads, who arbitrates, who validates technical and contractual choices.
This clarity avoids gaps and grey areas when incidents occur.
5.3. Addressing Corporate and Firm Blind Spots
Successful projects explicitly address:
- the clear distinction between storage, backup and evidential archiving;
- preservation of the original format and PDF/XML consistency;
- existence of a documented and reliable audit trail;
- anticipation of migrations (PA exit, archive provider change, mergers);
- active management of retention and destruction periods (tax and GDPR compliance).
5.4. Taking Audit and Litigation Risks Seriously
This is not a theoretical issue. The goal is to concretely reduce:
- tax reassessment risks (VAT, corporate tax, penalties);
- loss or weakness of evidence in commercial disputes;
- reservations or valuation discounts during financing or divestment operations.
A well-chosen and well-integrated SAE is a compliance and value-creation asset, not just a cost.
5.5. Choosing the Right Technical Architecture: SaaS or On-Premise
The SaaS vs. On-Premise choice is a structuring decision:
-SaaS (Hosted SAE):
- regulatory updates managed by the provider;
- scalability, availability, lower entry costs;
- dependency on the vendor, reversibility and data location challenges.
-On-Premise (Internal SAE):
- full infrastructure control, maximum sovereignty;
- deep integration into the existing IS;
- higher implementation and ongoing compliance costs (standards, security, DR/BC).
The right choice depends on:
- organization size;
- data sensitivity and sovereignty constraints;
- internal capabilities (IT, security, compliance);
- time horizon (short-term project vs. multi-year roadmap).
Conclusion
In 2026, electronic archiving is no longer a “nice to have” but a central pillar of electronic invoicing compliance. Organizations that succeed in their transition will be those that:
- integrate the SAE from the design phase of their e-invoicing framework;
- clearly define roles between PA, archive providers, trusted third parties and internal teams;
- proactively address technical, organizational and contractual blind spots.
Simply put, the question is no longer “Do we need serious electronic archiving?” but “How much will a poorly designed archiving strategy cost the company the day it is put to the test?”
