Skip to main content
Certyneo
Accounting Guide · OEC 2026

Electronic signature for accountants: complete guide

Article 151 of the OEC Code of Ethics requires a written engagement letter prior to any service. Combined with the requirements of the Commercial Code (certifications art. L823-12-1, board meeting minutes art. L232-1) and the Labour Code (payslip L3243-2), this represents a significant volume of contractual documents that an accounting firm must manage. This guide explains how to dematerialize all of them with enforceable legal value.

Last updated

Legal framework: electronic signature in accounting practice

The accountant is subject to strict professional rules (OEC Code of Professional Conduct) which impose precise contractual formalism. Advanced electronic signature (AES) compliant with eIDAS satisfies these requirements while simplifying the client relationship.

  • Engagement letter: AES recommended (art. 151 OEC Code of Professional Conduct) — proof of prior acceptance
  • Bank/URSSAF certificates: AES + verification URL (art. L823-12-1 C. com.)
  • General meeting minutes approving accounts: multi-signatory AES (art. L232-1 C. com.)
  • Dematerialized payslip: employer AES + employee secure archive over 50 years (art. L3243-2 C. trav.)

Documents electronically signable in accounting practice

Engagement letter (OEC art. 151)
Accountant certificate (bank, URSSAF, landlord)
General meeting minutes approving accounts (art. L232-1)
Dematerialized payslip (Macron law art. L3243-2)
Social and tax management mandate (DSN, VAT, IS)
Service agreement and confidentiality undertaking

Typical workflow for an accounting practice

  1. 1

    Prepare the engagement letter

    Template compliant with art. 151 OEC: scope, fees, duration, termination conditions. Word or PDF download supported.

  2. 2

    Invite the client to sign

    Secure link sent by email with SMS OTP. The client signs from their phone in 2 minutes — no in-person meeting required.

  3. 3

    Launch the engagement immediately

    Qualified timestamping proves prior acceptance. No risk of fee dispute in case of litigation.

  4. 4

    Archive automatically for 10 years

    The signed letter + audit trail are archived in compliance with art. L123-22 of the Commercial Code. Accessible in one click for any inspection or dispute.

Frequently asked questions — Electronic signature in accounting practice

Is the engagement letter really mandatory?
Yes — article 151 of the OEC Code of Professional Conduct requires every accountant to conclude a written engagement letter BEFORE the service begins. Absence or failure to sign exposes to disciplinary sanctions (reprimand, suspension) and complicates any fee dispute.
Is an electronically signed certificate accepted by banks?
Yes, without reservation. Major French banks accept certificates signed with AES eIDAS level — which has become the standard since 2024. The verification URL printed on the PDF allows the account manager to verify authenticity in one click.
Is the dematerialized payslip mandatory?
No, but optional for the employer. Since the Macron law (2017), the employer can switch to electronic payslips without prior employee agreement — it is sufficient to inform them one month in advance. The employee may object at any time.
What level of signature for general meeting minutes?
Advanced signature (AES) recommended. It provides a presumption of reliability (art. 1367 Civil Code) and meets evidential requirements in case of resolution challenge. Compatible with a dematerialized minutes register (PACTE law).
How long must signed accounting documents be kept?
Minimum 10 years (art. L123-22 Commercial Code). Certyneo automatically archives each document + its eIDAS audit trail for this duration, accessible from your dashboard.
→ Complete electronic signature guide · → Certyneo solution for accountants · → eIDAS guide — SES/AES/QES levels

Related guides and solutions

Explore the related resources from our electronic signature hub.

Recommended articles

Dematerialised payslip: legal value and record retention

The dematerialised payslip has the same legal value as its paper equivalent, provided strict retention rules are observed. Discover everything that dematerialisation entails for your HR obligations in 2026.

8 min

Electronic signature of payslips: guide 2026

Payslip digitisation is accelerating in 2026 thanks to electronic signature. Discover everything you need to know for compliant and efficient implementation.

8 min
Two businessmen collaborating on a laptop

Certyneo Webhooks: Automate accounting statements in ERP

Certyneo webhooks allow you to connect your electronic signature solution to your ERP or accountant in real-time. Discover how to automate the collection of signed documents in your accounting workflow.

8 min
a close up of a container with words on it

Activity Report in Accounting: Practical Guide 2026

Producing a rigorous activity report is a strategic issue for any accounting firm. Discover the methods, digital tools and legal obligations to master in 2026.

8 min
a screen with a bunch of information on it

Send an accounting statement for signature: complete guide

The validation of an accounting statement by electronic signature is gaining ground in accounting firms. Discover how to send your documents in full legal compliance.

8 min

Electronic Signature for Accounting Firms

Engagement letters, financial statements, tax returns: how accounting firms streamline their client signatures.

6 min

Digitalize your accounting practice

Permanent free plan (5 envelopes/month), no credit card required. Compliant with OEC Code of Professional Conduct and eIDAS. Audit trail and 10-year archiving included.

Certyneo Community

A question about electronic signatures?

Join the Certyneo community: ask your questions, share your answers and connect with thousands of users and our team.