Activity Report in Accounting: Practical Guide 2026

The drafting and transmission of an activity report in accounting and audit are unavoidable steps in the life of a firm. Whether it is to report to a client, document a statutory audit mission or manage internal activity, this document crystallises the professional's added value. Since the rise of digital technology and the growing obligation for traceability, the question of how to generate an activity report in the accounting and audit sector with electronic signature has become central. This article guides you step by step: definition, structure, tools, and integration of electronic signature to ensure the probative value of your deliverables.

What is an activity report in audit?

The activity report is a synthetic document that traces the missions carried out, the results achieved and the prospects for a given period. In the audit sector, it takes several forms depending on the recipient and the objective.

The different types of reports in an accounting firm

Three main categories are generally distinguished:

• The client mission report: document delivered at the end of a mission (accounting review, preparation of annual accounts, audit, etc.) that summarises the work performed, anomalies detected and recommendations made.
• The internal activity report: produced for the partner or management of the firm, it aggregates performance indicators (billable hours, completion rate, margin per file).
• The annual management report: mandatory for certain legal forms (SARL, SA, SAS), it accompanies the annual accounts approved by the general meeting in accordance with articles L.232-1 et seq. of the Commercial Code.

Each type implies a different structure, level of detail and recipients. Confusion between these documents is a frequent source of methodological errors.

Essential data to collect

Before generating an activity report, it is advisable to centralise source data. In practice, an accounting firm mobilises several reference systems:

• Firm management software (time spent, engagement letters, invoicing): ACD, Cegid, Quadratus, MyUnisoft, etc.
• Client accounting data from accounting production tools.
• Qualitative indicators: client satisfaction, mission incidents, recommendations not implemented.
• Regulatory elements: filed declarations, met deadlines, potential penalties.

The quality of the report is directly conditioned by the reliability and completeness of these source data. A structured information system — ideally integrated — is a prerequisite.

Recommended structure of an accounting activity report

A well-structured activity report follows a clear narrative logic: context, achievements, analysis, prospects. This architecture facilitates reading by non-specialists (business managers, shareholders) while maintaining the rigour expected by professionals.

The typical five-part plan

1. Executive summary In no more than one page, it answers essential questions: what missions were carried out? What results were achieved? What significant variances were identified? This summary is often the only part read by decision-makers.

2. Presentation of missions and scope of intervention Detail each mission with its associated engagement letter, the period covered, the file manager and any subcontractors. The inclusion of a summary table improves readability.

3. Analysis of results and key indicators This is the heart of the report. Present the KPIs defined contractually (filing deadlines, tax return rejection rate, number of administrative reminders avoided, etc.) with a comparison of current year vs. previous year and an explanation of variances.

4. Identified risks and recommendations Any audit report must document identified risks (tax risks, going concern risks, regulatory points of attention) and recommendations made. This section engages the professional responsibility of the auditor and constitutes evidence in case of dispute.

5. Prospects and action plan Conclude with a projection for the following period: tax and social deadlines to anticipate, training needs identified, regulatory developments to prepare (for example, mandatory electronic invoicing between businesses, the roll-out of which extends until 2026).

Automate report generation with digital tools

Manual generation of an activity report is time-consuming and error-prone. Modern solutions allow you to automate a significant portion of this work:

• Dashboards integrated into firm management software (MyUnisoft, Pennylane, ACD Infogerance) generate structured exports.
• Business Intelligence tools (Power BI, Tableau) allow you to cross data from multiple sources to produce dynamic reports.
• AI document generators — such as the Certyneo AI contract and document generator — provide assistance with drafting narrative sections, while ensuring terminological consistency.

Automation reduces production time by 40 to 60% according to benchmarks published by the Supreme Council of the Order of Statutory Auditors (CSOEC).

Electronic signature of the activity report: why and how?

An electronically signed activity report acquires greater probative value than an unsigned PDF document. In the event of a dispute — for example, a client denying receipt or approval of a mission report — electronic signature constitutes proof of integrity and authenticity that can be enforced in court.

The signature levels applicable in audit

The eIDAS regulation (No. 910/2014) distinguishes three levels of electronic signature, each corresponding to a different degree of reliability and use:

• Simple electronic signature (SES): suitable for low-stakes documents (meeting minutes, acknowledgements of receipt).
• Advanced electronic signature (AES): recommended for mission reports, engagement letters and mandates. It guarantees the identification of the signatory and the integrity of the document.
• Qualified electronic signature (QES): maximum level, legally equivalent to a handwritten signature. Required for certain notarial deeds or high-value legal documents.

For standard activity reports in an accounting firm, advanced signature constitutes the optimal balance between legal security and operational fluidity. You can consult the comprehensive guide to electronic signature to deepen these distinctions.

Integrate electronic signature into the report production workflow

The integration of electronic signature into the activity report generation process generally follows these steps:

1. Report production in the management or BI tool.
2. Export to PDF/A format (long-term archiving format recommended by ISO 19005 standard).
3. Send for signature via a SaaS electronic signature platform: the document is time-stamped, audit metadata is recorded.
4. Secure archiving of the signed report with its audit trail (signature log, qualified certificate).
5. Secure sharing with the client via a dedicated document space or encrypted link.

This approach is part of a logic of electronic signature for law and accounting firms that prioritises end-to-end traceability. To assess the return on investment of such an approach, Certyneo's electronic signature ROI calculator allows you to quantify the gains.

Best practices for distribution and archiving of the report

Generating a quality activity report is not enough: it is also necessary to ensure secure distribution and archiving that complies with legal obligations.

Regulatory retention periods

In accounting matters, retention periods are governed by several texts:

• 10 years for accounting documents (ledgers, journals, general ledgers, trial balances) under article L.123-22 of the Commercial Code.
• 6 years for tax documents (declarations, supporting documents) under article L.169 of the Tax Procedure Code.
• 5 years for mission reports under the professional civil liability of the auditor (article 2224 of the Civil Code — standard statute of limitations).

Digital archiving of electronically signed reports must meet the criteria of integrity, readability and accessibility throughout the retention period. The use of an Electronic Archiving System (EAS) certified NF Z42-013 is strongly recommended.

Security of exchanges and GDPR

Activity reports contain sensitive economic and financial data, sometimes protected by the professional secrecy of the auditor (article 21 of ordinance No. 45-2138 of 19 September 1945). Their transmission must comply with:

• Encryption of transmission channels (TLS 1.3 minimum).
• Strict access control to archived documents (strong authentication).
• GDPR obligations if reports contain personal data (employee names, payroll data, etc.).

For firms wishing to migrate from an existing solution to a more compliant platform, Certyneo's migration offer allows for a seamless transition.

Legal framework applicable to activity reports in audit

The production, signature and archiving of activity reports in an accounting firm falls within a complex legal framework, articulating civil law, commercial law, tax law and European regulation.

Civil Code and probative value of electronic signature

Article 1366 of the Civil Code sets the fundamental principle: "An electronic writing has the same probative force as a writing on paper, provided that the person from whom it originates can be duly identified and that it is established and kept under conditions such as to guarantee its integrity." Article 1367 clarifies that electronic signature consists in the use of a reliable identification method guaranteeing its link with the act to which it is attached.

Thus, an activity report signed via an advanced or qualified electronic signature solution benefits from the presumption of reliability laid down by these texts, making it difficult to prove otherwise.

eIDAS Regulation No. 910/2014 and signature levels

The Regulation (EU) No. 910/2014 of 23 July 2014 (eIDAS) harmonises the conditions for recognising electronic signatures at European level. It distinguishes three levels (simple, advanced, qualified) and establishes that the qualified electronic signature has the legal effect equivalent to a handwritten signature in all Member States. For accounting mission reports, the advanced signature — supported by a qualified certificate complying with ETSI EN 319 132 (XAdES) or ETSI EN 319 122 (CAdES) standards — is recommended by professional doctrine.

The eIDAS 2.0 regulation (Regulation (EU) 2024/1183, applicable progressively from 2024) strengthens digital identity requirements via the European digital identity wallet (EUDIW), which will have practical implications for the identification of signatories in cross-border firms.

Professional obligations of the auditor

Ordinance No. 45-2138 of 19 September 1945 establishing the order of statutory auditors imposes on members of the order a duty of advice, diligence and documentation of missions. The activity or mission report constitutes the documentary materialisation of this duty. Its absence or insufficiency may engage the civil professional liability of the auditor.

The Professional Quality Control Standard (NPMQ) of the Order, updated in 2021, requires file quality review and preservation of supporting documents. Electronically signed reports naturally fit into this framework.

GDPR and data protection

Regulation (EU) No. 2016/679 (GDPR) applies whenever reports contain personal data. The firm must ensure the lawfulness of the processing (legal basis: contract performance or legal obligation), minimisation of collected data and security of transfers. In the event of a data breach involving confidential reports, notification to the CNIL within 72 hours is mandatory (article 33 GDPR).

NIS2 Directive and cybersecurity

The NIS2 Directive (2022/2555), transposed into French law by law No. 2024-449 of 21 May 2024, imposes enhanced cybersecurity obligations on certain entities. Accounting firms of significant size or operating in critical sectors may be subject to requirements for risk management and incident notification.

Use cases: electronic signature of the activity report in practice

Scenario 1: A medium-sized accounting firm automates its mission reports

An accounting firm with about twenty employees manages approximately 350 active client files. Until 2024, annual mission reports were produced manually using Word, printed, signed by hand and sent by registered mail with acknowledgement of receipt. The average time between completion of work and transmission of the signed report to the client was 8 to 12 working days.

By deploying an integrated digital workflow — report production in PDF from the firm management software, automatic sending for advanced electronic signature via a SaaS platform, time-stamped archiving — the firm reduced this time to 24 to 48 hours. The time saving represents approximately 3 to 4 hours per file per year, an economy of around 1,000 to 1,400 hours annually for the entire firm, released for value-added missions. The rate of disputes related to reports "not received" or "not approved" by clients fell to zero thanks to the electronic audit trail.

Scenario 2: A group of SMEs with multiple sites requires electronic signature of its management reports

A holding company managing five subsidiaries in different sectors (distribution, services, light manufacturing) appoints an external audit firm to produce consolidated quarterly activity reports. The general management, based in Paris, oversees entities whose operational managers are spread across three French regions.

The obligation to obtain the signature of each subsidiary director to validate the consolidated report before submission to the board of directors generated uncompressible delays of 5 to 7 days. By switching to multi-signer electronic signature — each director signing from their secure interface, regardless of location — the process was reduced to less than 4 hours. The traceability of signatures (time, IP address, certificate) also strengthened the group's document governance and simplified controls during annual due diligence reviews.

Scenario 3: A franchise network integrates activity reports into its annual audit

A franchise network with around fifty franchisees engages an accounting firm to produce a standardised activity report by outlet, then aggregated at the network head level. The volume — fifty individual reports plus one consolidated report — made paper management unmanageable.

The adoption of a bulk electronic signature solution (batch signature) allowed the firm to send the fifty reports for signature to the franchisees concerned simultaneously, then automatically centralise them once signed. The time to collect signatures dropped from three weeks to less than 72 hours. Documentary compliance during tax audits and franchise contract renewals was significantly improved, reducing audit preparation time by approximately 35%.

Conclusion

Generating an activity report in accounting and audit is no longer a mere administrative formality: it is a professional act that engages the firm's responsibility and the client's trust. Rigorous structuring of the document, automation of its production and integration of eIDAS-compliant electronic signature constitute the three pillars of a modern and legally secure approach.

By adopting appropriate digital tools, accounting firms significantly reduce transmission times, eliminate disputes related to approval evidence and comply with regulatory archiving obligations. The probative value of the report is thereby enhanced, and the client relationship gains in transparency.

Ready to transform your document management process? Discover Certyneo solutions for accounting and law firms or calculate your ROI in a few minutes. To get started immediately, create your Certyneo account and enjoy a free trial.