Electronic Invoice Archiving: Legal Retention Period, Obligations and Evidentiary Value

Introduction: Why Electronic Invoice Archiving Is a Legal Priority

With the rollout of electronic invoicing 2026-2027 mandated by the 2020 Finance Act and its implementing decrees, French companies must master the rules governing archiving of their dematerialised invoices. Retaining an electronic invoice is not simply a matter of storing files on a hard drive: the law imposes a minimum retention period, strict integrity conditions and the ability to produce the document in the event of a tax audit or dispute. Poor archiving practices expose companies to tax assessments that may recover several years' worth of VAT. This article reviews the applicable retention periods, technical storage requirements, the concept of evidentiary value and the key role of the digital vault.

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What Is the Legal Retention Period for Electronic Invoices?

The question of the legal retention period is central to the concerns of finance teams and chief financial officers. Several regulations apply simultaneously, and their deadlines may differ depending on the nature of the document or the evidence sought.

6 Years Minimum for Tax Law

Article L. 102 B of the Tax Procedure Code (LPF) sets a 6-year minimum retention period for documents subject to the tax authority's right of examination. This period runs from the date of the last transaction recorded in the books or registers in question. In practice, an invoice issued in January 2025 must be retained until at least January 2031.

Moreover, Article L. 169 of the LPF provides for a VAT deduction claim review period of up to 3 years. In cases of fraud, this period extends to 6 years. Invoices are the primary supporting documentation for exercising the right to deduct VAT: their absence during an audit results in systematic rejection of the deduction claim.

10 Years for Commercial Law

Article L. 123-22 of the Commercial Code imposes a retention period of 10 years for all accounting documents, running from the end of the accounting period to which they relate. Invoices, being accounting documents, fall directly under this obligation. This 10-year period is generally accepted as the standard reference, as it covers both tax and commercial obligations.

In practice, an invoice relating to the accounting period ended 31 December 2025 must be retained until 31 December 2035.

5 Years for Civil Obligations

Under common civil law, the standard prescription period is 5 years (Article 2224 of the Civil Code). However, certain contractual liability claims may run for up to 10 years. For invoices related to construction or property work contracts, a ten-year warranty obligation requires retention for at least 10 years. It is therefore always safer to align with the maximum applicable period.

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The Technical Conditions for Archiving with Evidentiary Value

Retaining an electronic invoice for 10 years is not enough: the archiving must guarantee the integrity, readability and authenticity of the document throughout the entire retention period. This is what legal professionals call evidentiary value.

The Legal Framework: Integrity, Authenticity, Readability

Article 289 of the General Tax Code (CGI), amended by Ordinance No. 2022-1299 of 7 October 2022, sets three cumulative conditions for an electronic invoice to be enforceable against the tax authority:

• Authenticity of origin: the identity of the issuer must be certain, guaranteed by a qualified electronic signature within the meaning of the eIDAS regulation, or by a reliably formalised EDI (electronic data interchange).

• Content integrity: the invoice must not have been altered since issuance. A qualified electronic timestamp associated with the signature guarantees this immutability.

• Readability: the format must remain usable throughout the entire retention period, including if the information system changes.

The Factur-X (PDF/A-3 format with embedded XML data) and UBL 2.1 formats meet these requirements, provided suitable archiving is in place. For a complete understanding of the hybrid format, the Factur-X: The Franco-German Electronic Invoice Format page guides you step by step.

The Reliable Audit Trail (PAF): An Alternative to Electronic Signature

Since 1 January 2013, companies may also satisfy authenticity and integrity requirements via a reliable audit trail (PAF). The PAF is a set of documented management controls that link each invoice to the supporting documents that accompany it (purchase order, delivery receipt, account statement). It must be formalised, archived and enforceable. Many companies underestimate it: if audited, the absence of a formalised PAF can be sufficient to invalidate the entire VAT deduction claim.

The Role of the Digital Vault

A digital vault (CFN) certified to NF Z42-020 is the reference tool for guaranteeing evidentiary value over time. It ensures:

• Cryptographic sealing of files upon deposit (SHA-256 or higher fingerprint).

• Qualified timestamping in accordance with ETSI EN 319 421, creating proof of the deposit date that is enforceable against third parties.

• Immutable logging of all actions (deposit, access, download, deletion).

• Format migration to maintain readability in the long term (PDF/A conversion as standards evolve).

• Guaranteed restitution even if the service provider ceases operations (audit clause and data export).

Selecting a digital vault or an approved partner dematerialisation platform (PDP) by the tax authority is therefore a strategic decision, not merely a technical one.

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Archiving, E-Reporting and the 2026 Electronic Invoicing Reform

The reform brought about by Ordinance No. 2022-1299 and its implementing decrees redistributes responsibility for archiving among companies, approved partner dematerialisation platforms (PDPs) and the public invoicing portal (PPF). It is essential to understand who archives what.

What the PDP Retains on Your Behalf

PDPs approved by the tax authority have the obligation to retain invoices they have transmitted for at least 10 years from the date of issuance. They must also ensure business continuity and data portability. However, delegating archiving to a PDP does not relieve the company of its legal responsibility: in the event of provider failure, it is the taxpayer who answers to the tax authority.

It is therefore recommended to duplicate archiving: the PDP retains an operational copy, and the company maintains a backup copy in its own system, ideally in a certified digital vault.

E-Reporting and Transaction Data Retention

For B2C transactions and exchanges with foreign partners, outside the scope of mandatory electronic invoicing, the e-reporting requirement imposes the transmission of aggregated data to the tax authority. This transaction data must also be retained under the same rules as the invoices themselves: a minimum of 6 years under tax law, 10 years under commercial law.

Monitoring the deployment timeline and its impact on archiving systems

Large enterprises and mid-market companies have been subject to the obligation to receive electronic invoices since September 2026. The emission obligation follows a progressive timeline. This rollout requires urgent upgrading of archiving systems: companies receiving thousands of invoices per year must ensure their document management or digital vault solution is sized to absorb this volume while remaining compliant over time.

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Best Practices for Compliant and Sustainable Archiving

Beyond legal obligations, effective archiving of electronic invoices is also a lever for productivity and organisational resilience.

Establish a Documented Archiving Policy

Every company subject to VAT should have a formalised electronic archiving policy (PAE) covering:

• The scope of documents concerned (issued invoices, received invoices, credit notes, duplicates).

• Retention periods by document type and applicable legal basis.

• Internal responsibilities (archiving manager, system administrator, DPO for GDPR aspects).

• Procedures for migration and periodic integrity verification.

• Methods for secure deletion at the end of the retention period.

Automate Capture and Indexing

Manual archiving is a source of errors and loss. Modern solutions enable automatic capture of invoices in Factur-X or UBL format, with extraction of key metadata (invoice number, issuer SIRET, date, net amount, VAT amount, due date) upon receipt. This metadata enables rapid retrieval during a tax audit, reducing response time to the authorities from several days to just minutes.

Anticipate Technological Migrations

Digital formats age. Will a PDF issued in 2026 be readable in 2036? Certified digital vaults manage this risk via format migration plans that automatically convert files to current standards without altering content or breaking the original electronic signature (by preserving the original version and its fingerprint). To delve deeper into the legal value of electronic signatures in this context, our comprehensive guide details the long-term protection mechanisms.

Plan for Continuity in Case of Provider Change

Switching PDPs or digital vaults during a retention period is a frequently overlooked risk. Contracts must necessarily include:

• A complete data export right in a standard format (PDF/A, XML).

• A transition period guaranteeing access to archives for at least 6 months after termination.

• An audit clause allowing the company to verify archive integrity at any time.

The comparison of electronic signature and archiving solutions available on the market can help in selecting a reliable technology partner for the long term.

Legal Framework Applicable to Electronic Invoice Archiving

Electronic invoice archiving is governed by a structured body of regulations, covering the tax, commercial, civil and technical dimensions.

Fundamental Tax Legislation

Tax Procedure Code (LPF): Article L. 102 B requires retention of any document allowing the tax authority to exercise its right of examination for 6 years from the date the documents were created, received or transmitted. Article L. 169 sets the claim review period for income tax and corporate tax at 3 years (extended to 10 years in the case of concealed activity).

General Tax Code (CGI): Article 289 of the CGI, as amended by Ordinance No. 2022-1299 of 7 October 2022, defines three methods of issuing electronic invoices that guarantee authenticity, integrity and readability: qualified electronic signature, reliably formalised EDI and reliable audit trail (PAF). Article 1737 of the CGI imposes a penalty of 15 euros per missing or non-compliant invoice (minimum 60,000 euros per accounting period in the case of serious breach).

Commercial and Civil Law

Commercial Code: Article L. 123-22 imposes a retention period of 10 years for books, registers and accounting documents from the end of the accounting period. Invoices, as accounting supporting documents, are directly subject to this requirement.

Civil Code: Article 1366 recognises the evidential force of electronic writings "provided that the person from whom it emanates can be properly identified and that it is established and retained under conditions that guarantee its integrity". Article 1367 defines electronic signature as "the use of a reliable means of identification guaranteeing its link to the act to which it is attached".

eIDAS Regulation and ETSI Standards

The eIDAS Regulation No. 910/2014 (European Union), in force in its revised eIDAS 2.0 version since 2024, establishes a framework for mutual recognition of qualified electronic signatures throughout the EU. It recognises three levels of signature (simple, advanced, qualified) with differentiated legal effects. For electronic invoices, only the qualified signature creates an irrebuttable presumption of reliability.

The standards ETSI EN 319 132 (XAdES), ETSI EN 319 122 (CAdES) and ETSI EN 319 142 (PAdES) define the technical formats for signatures enabling long-term verification (LTA format — Long Term Archival). These formats incorporate chained validation proofs allowing verification of a signature's validity even after the initial certificate expires.

The NF Z42-020 standard from AFNOR defines the functional requirements for a digital vault certified in France.

GDPR and Invoices

Invoices containing personal data (name of individual customers, address, payment method) are subject to GDPR Regulation 2016/679. The retention period must be limited to what is necessary: the minimisation principle applies. In practice, the legal basis for processing is a legal obligation (Article 6.1.c of GDPR), which justifies full retention for the applicable tax or commercial retention period. Beyond this period, data must be deleted or anonymised.

Risks of Non-Compliance

• Tax assessment with recovery of deductible VAT for uncovered periods.

• Penalty under Article 1737 CGI (15 euros per invoice, minimum 60,000 euros per accounting period).

• Inadmissibility of the document in case of civil or commercial dispute.

• CNIL sanction in case of excessive or insufficiently secure retention of personal data.

Usage Scenarios: Electronic Invoice Archiving in Practice

Scenario 1 – A Small Industrial Manufacturing Company Managing 3,000 Supplier Invoices Per Year

A small engineering precision company with around fifty employees and annual turnover of approximately 8 million euros receives up to 3,000 supplier invoices per accounting period, mostly in unstructured PDF format. As the electronic invoicing obligation approaches, its CFO conducts an audit: invoices are stored on a shared server, with no cryptographic sealing, no integrity control and no migration plan. In the event of a tax audit, the company could not prove that files had not been altered after issuance.

By deploying a digital vault certified to NF Z42-020 connected to its invoicing solution, the company automatically seals each received invoice with a qualified timestamp. The PAF is automatically generated by linking each invoice to the corresponding purchase order and delivery receipt. Result: during a VAT audit covering 3 accounting periods, production of the 9,000 invoices requested is completed in less than 2 hours compared to several days previously, and no invoice is rejected for lack of integrity proof. The estimated risk of assessment at 180,000 euros in VAT is eliminated.

Scenario 2 – A Multi-Site Distribution Group with Large Volumes

A distribution group operating around ten points of sale issues an average of 15,000 B2B invoices per year to business customers. Before the reform, these invoices were generated by its ERP in simple PDF format, sent by email and archived in local folders by each site manager. Consolidation of this archiving was impossible, and the retention period was not uniform across sites.

By integrating an approved PDP coupled with a centralised digital vault, the group standardises the entire cycle: issuance in Factur-X format, transmission via the PDP, automatic archiving with metadata indexing. Retention periods are managed automatically by the system, with alerts six months before the legal deadline for each batch of documents. This centralisation reduces by 70% the time spent responding to tax authority information requests and enables real-time monitoring of archive compliance rates for the first time.

Scenario 3 – A Digital Transformation Consulting Firm

A consulting firm with around twenty consultants invoices its services to large enterprises and mid-market companies. Its invoices, often associated with complex master contracts and statements of work, must be retained not only to meet tax obligations but also to document work performed in case of contractual dispute. As the prescription period for professional liability claims can reach 5 years from discovery of damage, rigorous 10-year retention is essential.

The firm deploys a solution combining qualified electronic signature for its invoices and contracts, and a digital vault for long-term archiving. Each invoice is electronically linked to the corresponding contract and engagement report, creating an unbroken documentary chain with evidentiary value. This system, implemented in less than 3 months, represents an investment of a few hundred euros per month — roughly ten times less than the cost of a single undocumented dispute according to professional liability insurance industry estimates.

Frequently Asked Questions

What is the difference between the tax retention period and the commercial retention period for invoices?

Tax law requires retention for 6 years from the date of the last transaction (Article L. 102 B of the French Tax Procedure Code), while the Commercial Code requires 10 years from the end of the relevant financial year (Article L. 123-22). These two periods run differently and may therefore not end at the same time. In practice, adopting 10 years as a single rule makes it possible to satisfy both obligations simultaneously without any risk.

What is the evidentiary value of an electronic invoice and how is it obtained?

Evidentiary value refers to the capacity of a digital document to serve as evidence before a court or the tax authorities. For an electronic invoice, it is based on three cumulative guarantees: the authenticity of the issuer, the integrity of the content, and the permanent readability of the file. These guarantees are obtained through a qualified electronic signature compliant with the eIDAS regulation, a qualified timestamp, or a reliable audit trail that is properly documented.

Does a reliable audit trail completely replace the electronic signature on an invoice?

Yes, since 1 January 2013, a reliable audit trail (PAF) constitutes a legal alternative to an electronic signature for meeting the requirements of authenticity and integrity laid down in Article 289 of the French Tax Code. In practice, it consists of a set of documented management controls linking each invoice to its supporting documents (order, delivery, payment). However, it must be formalised in writing and retained in the same manner as the invoices themselves.

Is simple storage in a cloud space sufficient for archiving electronic invoices?

No. Standard cloud storage does not guarantee the cryptographic integrity of files, their opposable timestamp, or the access logging required in the event of an audit. Archiving with evidentiary value requires a system ensuring the sealing of files upon deposit, a qualified timestamp, and the migration of formats over time. A certified digital vault meets these criteria; a simple shared online folder does not.

What penalties may be incurred in the event of improper archiving of electronic invoices?

The absence of usable invoices during a tax audit results in the rejection of the corresponding VAT deduction right, to which penalties and interest on arrears are added. From an accounting perspective, the irregularity may also call into question the accuracy of the accounts. In the event of proven fraud, the period for the tax authorities to make adjustments is extended to 6 years, exposing the company to assessments covering several financial years.

Conclusion

Electronic invoice archiving is a legal obligation with precise scope: 6 years under tax law, 10 years under commercial law, with strict technical requirements regarding document integrity, authenticity and readability. The evidentiary value of an electronic invoice does not depend on its format alone, but on the entire retention system — certified digital vault, qualified timestamping, reliable audit trail — put in place from its issuance.

With the progressive entry into force of the electronic invoicing reform in 2026 and 2027, companies can no longer afford to improvise their archiving policy. Each invoice not archived in compliance is a risk of tax assessment, rejection of VAT deduction or inadmissibility in case of dispute.

Certyneo supports you in bringing your electronic archiving into compliance, from selecting your approved PDP to integrating a certified digital vault. Request a demonstration or get started for free today.