The income-sharing mechanism is an operational pillar of solidarity finance. It requires solidarity products to donate at least 25% of interest to charitable associations. This mechanism was inaugurated by the "Faim et developpement" mutual fund, created in 1983 by Credit Cooperatif and CCFD.

The principle of primacy of social utility over profit maximization is a key foundation of solidarity finance. According to the Banque de France, this principle stipulates that financial returns are accepted as sustainable but are not the primary objective. This distinguishes it from traditional financial approaches focused on maximizing profitability.

Solidarity finance focuses on sectors that have a significant social and environmental impact. According to 2024 data, solidarity-based funding supports projects in social housing, health and social services, employment and workforce integration, as well as ecological transition. These sectors are often overlooked by traditional financial markets.

Several factors limit the organic growth of solidarity finance. Its awareness remains low, at only 0.46% of total French savings. Dependence on regulation, such as the mandatory solidarity fund in employee savings (which generates 55% of assets), raises questions about its sustainability. The strict definition of ESUS-eligible enterprises also limits investment opportunities. Finally, its French cultural roots make it difficult to export at the European level.

The loi ESS of July 31, 2014, did indeed structure the legal framework for solidarity finance by defining the scope of the social and solidarity economy and creating the ESUS accreditation. This accreditation is granted by the DREETS for a period of five years to organizations that meet strict criteria, including a pay ratio capped at 1:10.

In 2024, the total assets in solidarity finance amount to 29.4 billion euros, which represents approximately 3.5% of ISR-labeled funds (which exceed 800 billion euros). This share shows that while growing, solidarity finance remains marginal compared to other forms of sustainable finance.

Solidarity-based employee savings are a major collection channel for solidarity finance. They stem from the loi Fabius of 2001 and the loi LME of 2008, which require employer savings plans to offer at least one solidarity fund. In 2024, they represent 55% of total solidarity savings assets, amounting to 16.3 billion euros.

Solidarity-based savings are divided into several types, each playing a specific role. Employee savings schemes represent 55% of the total, while bank savings and direct shareholding complete the landscape. Measured impacts include concrete indicators such as jobs created or people rehoused. In 2024, these impacts demonstrate the tangible contribution of solidarity finance to social and environmental objectives.