Human ressources

Explore, secure, develop: our 3-step DSN method

The Nominative Social Declaration (DSN) is now a cornerstone for safeguarding employees’ social rights and ensuring the collection of contributions. Ensuring the reliability of this data has become a national priority: increased oversight, combating fraud, automating adjustments… the challenges are many.
The consequences of a non-compliant DSN can be severe: errors in employee benefits, unbudgeted URSSAF demands, and a deteriorating work environment. Don't be a victim of DSN: anticipate, secure and optimize.

Our conviction

DSN compliance is an HR performance lever

Our DSN support

Our payroll and DSN experts train and advise your teams - HR, Payroll, Controlling, General Management - on a daily basis, to provide you with the levers you need to boost your company's productivity and efficiency.

Our conviction: DSN compliance is not a constraint - it's an HR performance lever that your teams can fully control.

At G.A.C. Group, we transform this declarative constraint into a genuine opportunity to enhance your skills and HR management. Our support is based on a tried-and-tested methodology and recognized expertise, to make your data more reliable, secure your practices and empower your teams.

Our approach is deployed in three phases, to meet the various DSN requirements: 

To explore

In-depth audit - analysis of declarations and detection of anomalies and non-compliance risks

To secure

Feedback and support - presentation of identified discrepancies and correction

Develop

Upgrading skills - by passing on our know-how to the payroll team
Our approach

A proven methodology in 3 complementary phases

To explore

Phase 1 - In-depth audit

The audit is carried out using several complementary approaches, combining different control angles to ensure an efficient analysis.

Payroll / DSN Mirror Analysis - checking consistency between payroll and DSN data.

Intra-DSN compliance - checking the consistency of blocks fed, including comparison of individual and aggregated data.

To secure

Phase 2 - Feedback and support for implementation

Concrete support to transform audit findings into operational corrective actions.

Audit Report with details of any discrepancies identified and recommendations for regularizing payroll settings.

Anomaly summary containing a classification of anomalies according to their nature to facilitate their processing.

Organizational recommendations to streamline DSN management in the Payroll process.

Develop

Phase 3 - Support for skills upgrading

We have developed specific training modules to effectively support companies in understanding, mastering and strategically exploiting the DSN. Our training courses aim to enhance the skills of HR, payroll and management control teams in these complex areas.

Adapted modules your level of maturity: beginner, advanced or expert.

An operational approach Practical case studies and real-life examples.

Flexible formats : inter- or intra-company sessions, face-to-face or distance learning.

Our training modules

Discover our DSN training modules

Led by our experts in DSN compliance, payroll and social contributions, our training courses are designed to make your teams fully autonomous.

Suitable levels

Modules adapted to your level of maturity: initiation, improvement or expertise.

Operational approach

Case studies and concrete examples from the field, led by our experts.

Flexible formats

Inter or intra-company sessions, face-to-face or remote, according to your availability.

Understanding DSN

Understand the fundamentals of DSN, its architecture, declarative blocks and its role in the payroll-declaration chain. Ideal for teams new to DSN, or wishing to consolidate their knowledge.

Mastering DSN: reliability and points to watch out for

Gain a deeper understanding of DSN by identifying areas of risk, recurring errors and essential points of vigilance to guarantee the conformity and reliability of declared data.

Understand feedback from organizations and be a in the process of improving reliability

Understand and exploit feedback from organizations (URSSAF, pension funds, etc.), analyze reported anomalies and take an active role in the ongoing process of making DSN data more reliable.

 

They trust us

G.A.C. Group in figures

97,5%

taux de satisfaction global en 2025 sur l'ensemble de nos prestations

93,5%

de nos clients nous recommandent en 2025

4,5/5

note obtenue en 2025 sur la proximité et disponibilité de nos équipes
Témoignages

Ce que disent nos clients

Take action

Don't be a victim of DSN: anticipate, secure, optimize

Contact our payroll and DSN experts to make your data more reliable, secure your practices and empower your teams.

Related articles
Human Resources
Baromètre des DRH 2026
6 July 2026
Découvrez les priorités RH 2026 révélées par 285 décideurs : IA, recrutement, formation, SIRH, prévention des RPS et conformité paie. Téléchargez le Baromètre des DRH G.A.C. Group.
Baromètre des DRH 2026
Human Resources
End of career, retirement, DSN: how to secure employees' rights while reducing HR risk?
28 April 2026
Take part in the G.A.C. Group x Sapiendo webinar on DSN, retirement and the end of career. Find out how to make social data more reliable, secure employees' pension rights and reduce HR risk.
End of career, retirement, DSN: how to secure employees' rights while reducing HR risk?
Human Resources
CRM 124: the last step before DSN substitution
1 April 2026
Reminder CRM 124 identifies uncorrected anomalies from 2025 prior to substitution DSN. Discover the action priorities and download our decryption.
CRM 124: the last step before DSN substitution
Human Resources
FAQ webinar payroll and social security contributions 2026: your experts answer your questions
February 12, 2026
RGDU, birth leave, overtime: discover the answers of our 2026 payroll experts following the webinar to secure your decisions and remain compliant.
FAQ webinar payroll and social security contributions 2026: your experts answer your questions
Human Resources
TOP DRH Marseille 2026 - Join our Payroll, DSN & RPS highlights
February 11, 2026
Decipher payroll 2026, anticipate DSN (reminder CRM → substitution) and exchange RPS in Tea Time. Ask for your invitation.
TOP DRH Marseille 2026 - Join our Payroll, DSN & RPS highlights
Human Resources
The challenges facing HRDs in 2026: a free exchange between peers
3 February 2026
HR: optimize your HR performance in 2026. Confidential exchanges between peers on your priorities and trade-offs. 60-minute session, anonymized summary.
The challenges facing HRDs in 2026: a free exchange between peers
Human Resources
G.A.C. Group announces the acquisition of DIDACTHEM and consolidates its value proposition to meet social challenges
2 February 2026
G.A.C. Group announces the acquisition of DIDACTHEM. Find out how this alliance strengthens G.A.C. Group's risk prevention and HR performance consulting offer.
G.A.C. Group announces the acquisition of DIDACTHEM and consolidates its value proposition to meet social challenges
Human Resources
How can you make DSN your ally throughout the payroll cycle?
January 26, 2026
Since 2023, the DSN has been synonymous with CRM corrections to be processed and time spent “catching up” on errors to avoid substitute DSNs. This model is on its last legs: correcting the DSN means you're already behind. True performance now means anticipating, by making the DSN more reliable at every stage of the payroll cycle.
How can you make DSN your ally throughout the payroll cycle?