A tax audit rarely goes wrong over the numbers. It goes wrong over the documents. Your company's accounting may be flawless. But if the invoice backing an expense report has gone missing, or all that remains is an illegible till receipt, the tax authority will disallow the deduction. Expense receipt archiving is not a housekeeping matter. It is a matter of legal and tax protection. Here is what the law actually requires, what separates "legally stored" from legally defensible archiving, and how the 2026 e-invoicing reform changes the equation.
- The retention period for supporting documents is 10 years (French Commercial Code). The tax authority's right of audit runs for 6 years (French Tax Procedures Code)[1].
- A till receipt is not an invoice: it does not substantiate a business expense and does not allow VAT recovery[2].
- Legally defensible archiving requires a reliable audit trail, qualified timestamping, and verified file integrity throughout the full retention period. Storing a PDF on a shared drive does not meet this standard.
Retention period: 6 years or 10 years?
Two separate frameworks overlap here, which is exactly what creates the confusion. On the accounting side, article L.123-22 of the French Commercial Code requires that books, registers, and supporting documents (customer and supplier invoices, purchase orders, delivery notes) be kept for 10 years from the close of the financial year[1]. On the tax side, article L.102 B of the French Tax Procedures Code sets the period during which documents must be available to the tax authority (right of communication and audit) at 6 years[1]. In cases of concealed activity (fraud, undeclared work, failure to file), that period rises to 10 years.
The practical rule is straightforward: apply the longer deadline. Keep your expense receipts for 10 years
Invoice or receipt: what actually counts as a supporting document
In practice, the most common mistake is assuming that a card payment receipt or a till receipt is enough. It is not. A ministerial ruling has stated clearly that a till receipt cannot serve as an invoice, even for small purchases[2]. Why? Because an invoice must carry mandatory details (the seller's VAT number, a precise item description, the VAT rate and amount) that a receipt does not include. Without those details, there is no VAT recovery, and the expense is far harder to defend under audit.
The direct implication for expense reports: always ask the merchant for an invoice, not a receipt. A meal on the road, a fuel fill-up. The rule is the same. This is also one of the key reasons a professional fuel card changes the game: it generates a consolidated invoice instead of a bundle of receipts, and archiving follows automatically.
Receipt ≠ invoice. A till receipt does not substantiate a business expense and does not allow VAT recovery. Always ask for an invoice, even for a few euros. It is the only document that qualifies as a supporting record for accounting and tax purposes.
Legally defensible e-archiving: what "storing" does not do
Saving an invoice PDF to a hard drive, a shared Drive, or an email inbox is not legally defensible archiving. It is storage: no one can prove, six years later, that the file has not been altered or that its date is reliable. Legally defensible archiving rests on three pillars[3][4]: integrity (a tamper-proof document, sealed and timestamped under the eIDAS regulation, providing a certified date that can be relied upon), traceability (the ability to trace who deposited the document, when, and who accessed it: this is the reliable audit trail that has become central to the e-invoicing reform), and durability (a format that remains readable over ten years, even as software changes).
In terms of standards, NF Z42-013 governs legally defensible electronic archiving in France: timestamping, sealing, logging, procedures. At the European level, eIDAS defines qualified timestamps and qualified electronic signatures. Choosing a provider certified to NF Z42-013 partially transfers the burden of proof: it is the operator who attests to integrity and timestamping.
The link with the 2026 e-invoicing reform
The e-invoicing reform fundamentally changes the landscape. From 1 September 2026, all VAT-registered businesses will be required to receive electronic invoices via an accredited platform (PA) or the Public Invoicing Portal (PPF)[5]. Mandatory issuance follows on 1 September 2027 for SMBs and micro-businesses. The supported formats are Factur-X (hybrid PDF/XML), UBL 2.1, and CII.
What does this mean for your supporting documents? Invoices received from suppliers will already arrive structured and timestamped, with an audit trail built in by design. One important nuance: legally defensible archiving is not a legal requirement under the reform itself[3] — but it becomes the de facto standard, since the flows are designed to support it. Receiving structured invoices only to flatten them into a shared folder destroys all the native probative value the system provides. The logical move is to archive at the same level as what you receive.
With e-invoicing, probative value arrives with the invoice — you just have to avoid destroying it by storing it poorly. The right approach: connect your archiving directly to the incoming flow, rather than retrofitting compliance after the fact.
Setting up expense receipt archiving in your company
Operationally, expense receipt archiving comes down to three levers. 1) Capture at source. The earlier a document is collected, the less likely it is to get lost. An expense management solution with a payment card that automatically attaches the receipt to the transaction at the point of payment beats any manual process — no more receipts lost in jacket pockets. 2) Accounting linkage. Each supporting document must be tied to its journal entry in a traceable way: that is precisely what a reliable audit trail requires. 3) Qualified retention. Ten years on a timestamped, tamper-proof medium, ideally with a certified operator.
The trap is fragmentation. When fuel receipts sit with one provider, meal receipts in another tool, miscellaneous receipts in an email inbox, and supplier invoices in yet another system, you recreate exactly the silos that digitisation was supposed to eliminate. The key criterion when selecting an expense management platform becomes: does it consolidate all my receipts in one place, with integrated legally defensible archiving? This is also where the link with your fleet management becomes clear. Fuel, tolls, and travel all generate a single category of documents to archive.
For organisations that want a broader view of the trade-offs, our fuel cards vs mileage allowances comparison shows how the choice of payment method already determines the quality of the receipt you get back, and therefore the robustness of your archiving.
Frequently asked questions
What is the legal retention period for business expense receipts?
Supporting documents (invoices, purchase orders, delivery notes) must be kept for 10 years from the close of the financial year (article L.123-22 of the French Commercial Code). The tax authority's right of audit runs for 6 years (article L.102 B of the French Tax Procedures Code)[1]. The 10-year rule is applied in practice to cover both risks.
Does a till receipt count as an accounting record?
No. A till receipt does not include the mandatory fields required on an invoice and does not support VAT recovery. A ministerial ruling confirms this: it cannot serve as an invoice, even for small purchases[2]. Always ask for an invoice.
What is legally defensible archiving?
It is an archiving method that guarantees the integrity (tamper-proof document), traceability (reliable audit trail), and certified date (qualified eIDAS timestamp) of each document throughout the full retention period[3][4]. Storing a PDF on a shared drive meets none of these conditions.
Is legally defensible archiving mandatory under the e-invoicing reform?
No, it is not a legal requirement under the reform[3]. It is, however, strongly recommended: electronic invoices received from 1 September 2026 onwards will already arrive structured and timestamped, and it would be counterproductive to destroy that native probative value by storing them in a plain folder.
When does e-invoicing become mandatory?
Receiving electronic invoices becomes mandatory for all VAT-registered businesses from 1 September 2026. Issuing them follows on 1 September 2027 for SMBs and micro-businesses[5]. All exchanges pass through an accredited platform (PA) or the Public Invoicing Portal (PPF).
Which standard governs electronic archiving in France?
NF Z42-013 sets the technical and organisational requirements for a legally defensible electronic archiving system (timestamping, sealing, logging). At the European level, the eIDAS regulation governs qualified timestamps and electronic signatures. Choosing a provider certified to NF Z42-013 partially transfers the burden of proof.
Pillar guide. This article is part of our expense management and expense reports white paper, which connects receipt capture, payment, accounting controls, and archiving.
References
- Entreprendre Service-Public (DILA / French Prime Minister's Office), What are the document retention periods for businesses? — accounting records: 10 years (Commercial Code, art. L.123-22). Tax authority right of communication: 6 years (Tax Procedures Code, art. L.102 B). 10 years in cases of concealed activity. entreprendre.service-public.gouv.fr. ↩
- ANAFAGC, Can a till receipt serve as a supporting document for small purchases? (ministerial ruling: a receipt cannot substitute for an invoice). anafagc.fr. ↩
- ESALINK, Legal archiving vs legally defensible archiving — distinction, reliable audit trail, non-mandatory status under the e-invoicing reform. esalink.com. ↩
- Ingedis, What is legally defensible archiving? — integrity, traceability, durability, timestamping. ingedis-solutions.fr. ↩
- Entreprendre Service-Public (DILA / French Prime Minister's Office), E-invoicing: coming soon — mandatory reception from 1 September 2026, mandatory issuance from 1 September 2027, accredited platform (PA) and Public Invoicing Portal (PPF). entreprendre.service-public.gouv.fr. ↩
