Activity Report in Accounting: Practical Guide 2026

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

What is an activity report in professional accountancy?

An activity report is a summary document that traces the missions carried out, the results obtained and the prospects for a given period. In the professional accountancy sector, it takes several forms depending on the recipient and objective.

The different types of reports in accounting firms

There are generally three broad categories:

• The client mission report: document delivered at the end of a mission (accounting review, preparation of annual accounts, audit, etc.) that summarises the work carried out, anomalies detected and recommendations made.
• The internal activity report: produced for the benefit of 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.

The essential data to collect

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

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

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

Recommended structure for 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 standard five-part plan

1. Executive summary In one page maximum, it answers the 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. Including 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, rejection rate of tax returns, number of administrative reminders avoided, etc.) with a comparison N vs N-1 and an explanation of variances.

4. Identified risks and recommendations Any professional accountancy report must document the risks identified (tax risks, going concern risks, regulatory attention points) and the recommendations made. This section engages the professional responsibility of the accountant 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 changes to prepare (for example, compulsory 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 part 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 contracts and documents generator — offer assistance in writing narrative sections, whilst ensuring terminological consistency.

Automation reduces production time by 40 to 60% according to sector benchmarks published by the Higher Council of the Order of Accountants (CSOEC).

Electronic signature of the activity report: why and how?

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

The levels of signature applicable in professional accountancy

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 authentic acts or documents of high legal value.

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

Integrating electronic signature into the production workflow

Integrating electronic signature into the activity report generation process typically 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. Sending 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 fits into a logic of electronic signature for law firms 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 benefits.

Best practices for distributing and archiving the report

Generating a quality activity report is not enough: its secure distribution and compliance with legal archiving obligations must also be ensured.

Regulatory retention periods

With regard to accounting matters, retention periods are governed by several texts:

• 10 years for accounting documents (ledgers, journals, general ledgers, 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 framework of the accountant's professional liability insurance (article 2224 of the Civil Code — standard limitation period).

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 covered by the professional secrecy of the accountant (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 the 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 enables a seamless transition.

Legal framework applicable to activity reports in professional accountancy

The production, signature and archiving of activity reports in accounting firms is part of a dense 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 establishes the fundamental principle: "Electronic writing has the same probative force as writing on paper, provided that the person from whom it emanates can be duly identified and that it is established and kept in conditions such as to guarantee its integrity." Article 1367 specifies that electronic signature consists in the use of a reliable identification procedure guaranteeing its link with the act to which it attaches.

Thus, an activity report signed via an advanced or qualified electronic signature solution benefits from the presumption of reliability posed by these texts, making it difficult to produce proof to the contrary.

eIDAS Regulation No. 910/2014 and signature levels

The Regulation (EU) No. 910/2014 of 23 July 2014 (eIDAS) harmonises the conditions for recognition of electronic signatures at European level. It distinguishes three levels (simple, advanced, qualified) and establishes that qualified electronic signature has the legal effect equivalent to a handwritten signature in all Member States. For accounting mission reports, advanced signature — supported by a qualified certificate compliant 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.

Deontological obligations of the accountant

The Ordinance No. 45-2138 of 19 September 1945 establishing the order of accountants requires members of the order to exercise a duty of advice, diligence and mission documentation. The activity or mission report constitutes the documentary materialisation of this duty. Its absence or insufficiency may engage the professional liability of the accountant.

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

GDPR and data protection

The Regulation (EU) No. 2016/679 (GDPR) applies whenever reports contain personal data. The firm must ensure the lawfulness of processing (legal basis: contract performance or legal obligation), minimisation of data collected and security of transfers. In case 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 Act No. 2024-449 of 21 May 2024, imposes strengthened cybersecurity obligations on certain entities. Accounting firms of significant size or operating in critical sectors may be subject to risk management and incident notification requirements.

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 around twenty employees manages approximately 350 active client files. Until 2024, annual mission reports were produced manually in Word, printed, signed by hand and sent by registered mail with proof 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 implementing 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 timeframe to 24 to 48 hours. The administrative time saving represents approximately 3 to 4 hours per file per year, equivalent to savings of around 1,000 to 1,400 hours annually for the entire firm, freed up for higher-value 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) mandates 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 requirement to collect the signature of each subsidiary director to validate the consolidated report before submission to the board of directors generated unavoidable 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 firm's documentary 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 sales outlet, then aggregated at the network head level. The volume — fifty individual reports plus one consolidated report — made paper management unmanageable.

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

Conclusion

Generating an activity report in accounting and professional accountancy is no longer a simple administrative formality: it is a professional act engaging the firm's liability and client 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 over approval evidence and comply with regulatory archiving obligations. The probative value of the report is strengthened, and the client relationship gains in transparency.

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