Complete Payroll Management in Business: 2026 Guide
Payroll management is a strategic pillar of any business. Discover the 2026 obligations, best practices, and how dematerialization is transforming this process.
9 min
Accountants & payroll firms
Electronic signature for accountants and payroll firms
Engagement letters, certificates, approval minutes, pay slips, social declarations, management mandates: digitalize all documents signed by your firm and clients with eIDAS proof level. Compliant with Order No. 45-2138, the OEC Code of Ethics, the Commercial Code, the Labor Code (art. L3243-2), and the eIDAS regulation.
Use cases in accounting and payroll practice
All contractual documents of an accounting and payroll firm can be electronically signed, from the engagement letter to the individual social declaration.
Engagement letter
Mandatory under article 151 of the Code of Ethics, the engagement letter must be signed by the client BEFORE the service begins. Remote signature in 2 minutes, qualified timestamp proving prior acceptance of terms and fees.
Accountant's certificate
Certificates for banks (revenue, debt capacity), social bodies (URSSAF), landlords or authorities. AES signature + audit trail = proof of authenticity enforceable.
Minutes of approval of annual accounts
Minutes of ordinary general meetings (article L232-1 of the Commercial Code), with sequential or parallel signature of partners. Automatic maintenance of dematerialized PV register.
Dematerialized pay stub
Compliant with article L3243-2 of the Labor Code (from the 2015 Macron law) and decree no. 2016-1762. Made available in a compliant digital safe, presumed consent of the employee — express refusal possible at any time.
Social and tax management mandate
Mandates by which the client entrusts the firm with the management of social (DSN) and tax declarations (VAT, income tax, business property tax). Advanced signature to identify the principal and trace the precise scope of the mandate.
Service agreements and client commitments
Confidentiality commitments, agreements for specific services outside the engagement letter, outsourcing agreements between firms: the entire contractual scope of the firm is covered.
Why Certyneo for an accounting firm
Six guarantees specifically tailored to the ethical and evidential requirements of the accounting profession.
Strong client identification
OTP SMS + email verification of the signatory, qualified timestamp, SHA-256 fingerprint of the document. The audit trail covers all requirements of the Code of Ethics regarding formalization of commitments.
Enforceable audit trail
Each envelope produces a signature certificate: OTP identity, IP, qualified timestamp, SHA-256 hash, integrated into the signed PDF. Admissible before the Bar Association, in fee disputes and before all courts.
Professional secrecy respected
TLS 1.3 encryption in transit, AES-256 at rest, strict data isolation by firm. 100% EU hosting (Germany), no outsourcing outside the EU. Standard DPA included, compliant with professional secrecy of article 8 of ordinance 45-2138.
Archiving compliant with accounting timeframes
10-year archiving included with probative value (article L123-22 of the Commercial Code — retention period for accounting records). Full export at any time for transmission to a successor or for tax audit.
eIDAS compliant — advanced level (AES)
Advanced signature compliant with regulation (EU) no. 910/2014. For acts requiring the qualified level (QES — authentic acts), our roadmap includes a partner QTSP provider.
Integration with professional software
Public REST API, event webhooks, and ongoing integrations with major accounting software (CEGID, ACD, RCA, ISACOMPTA, QuadraCompta). Compatible with your existing stack.
Probative value for an accounting firm
The probative value of an electronic signature in an accounting firm depends on two fronts: demonstrating the client''s informed consent to the engagement letter (article 151 of the Code of Ethics) and establishing the authenticity of certificates issued under article L823-12-1 of the Commercial Code.
Certyneo delivers for each signature an audit certificate integrated into the PDF, which brings together technical evidence:
- Identity of the signatory (email + phone number verified by OTP)
- Qualified timestamp of each action (send, view, sign, refuse)
- SHA-256 cryptographic fingerprint of the signed document
- IP and rough geolocation of the signatory at the time of signature
- Detailed log of reminders and notifications
This bundle of evidence meets the requirements of article 1366 of the Civil Code (probative force of electronic writing) and is recognized by French case law (Cass. com., 13 March 2019). For certificates addressed to a third party (bank, URSSAF, landlord), the audit trail provides proof of authenticity of the document issued by the firm.
OEC compliance, Commercial Code and eIDAS
Certyneo is part of the legal and ethical framework applicable to the accounting profession.
OEC Code of Ethics
Article 151 of the Code of Ethics requires a written engagement letter prior to any service. Article 145 governs the confidentiality of client data. Certyneo applies end-to-end encryption and archiving with probative value compatible with these obligations.
Commercial Code — art. L123-12 and L823-12-1
Article L123-12 sets the accounting obligations of merchants; article L823-12-1 governs certificates issued by statutory auditors. Certyneo''s advanced signature meets the authenticity and integrity requirements of these provisions.
Labor Code — art. L3243-2 (pay stub)
Since the Macron law of 6 August 2015, the employer may provide the pay stub in electronic form under conditions guaranteeing its integrity, its availability for 50 years (or until the employee reaches age 75) and the confidentiality of data.
Article 1366 of the Civil Code & eIDAS regulation
Electronic writing has the same probative force as paper writing if the identity of the signatory can be duly established and the integrity of the document is guaranteed. Certyneo''s advanced signature (AES) meets these two requirements under regulation (EU) no. 910/2014.
Frequently asked questions from accounting firms
Can an engagement letter from a chartered accountant be signed electronically?
Yes, without restriction. Article 151 of the Code of Professional Conduct requires prior written documentation but does not prescribe any particular form. Certyneo's advanced signature (AES) meets evidentiary requirements, with the advantage of precisely timestamping the acceptance of fees and mission scope BEFORE the service begins.
What is the value of a chartered accountant's attestation signed electronically against a bank?
An attestation signed electronically with AES level (Certyneo) has identical value to a paper attestation manually signed and stamped. The recipient (bank, URSSAF, landlord) can verify the audit trail from the verification URL included in the PDF certificate — they can see the signer's identity, date, and absence of document alteration.
Is the dematerialized payslip mandatory for all employees?
Since the Macron law (January 1, 2017), the employer can provide the payslip in electronic form without prior employee consent, provided they have informed the employee at least one month in advance and respect retention conditions (50 years or until the employee reaches age 75). The employee may object at any time.
How long must an engagement letter be retained?
Article L123-22 of the Commercial Code requires retention of accounting documents for 10 years. As a precaution, the same duration applies to engagement letters, which serve as proof of fee acceptance in case of dispute. 10-year archiving is included in all Certyneo plans.
Does Certyneo integrate with my accounting software?
A public REST API is available with event webhooks (envelope.signed, recipient.signed, etc.). Native integrations with major accounting software (CEGID, ACD, RCA, ISACOMPTA, QuadraCompta) are being deployed. Contact us for the exact status on your solution.
Is the professional confidentiality of the chartered accountant respected?
Yes. Certyneo applies TLS 1.3 encryption in transit and AES-256 at rest, strict isolation by firm, and 100% EU hosting (Germany, IONOS) without subcontracting outside the EU. A GDPR-compliant DPA is available and incorporates specific clauses for professional confidentiality under Article 8 of Ordinance 45-2138.
Can a shareholders' meeting minutes be signed by multiple associates through electronic signature?
Yes. Certyneo natively manages signatures in series or in parallel between multiple signatories. Each associate receives their personal link with SMS OTP on their own number. The unique audit trail brings together all signatures and timestamps, facilitating dematerialized management of the minutes register.
How much does electronic signature cost for an accounting firm?
A free plan allows testing on 5 envelopes per month. Beyond that, paid plans start at a rate compatible with client billing (rebilling possible). The rate includes 10-year archiving, eIDAS audit trail and technical support.
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