Public sector financial advisory and audit: M57, CFU and financial management in 2026

Financial advisory and audit for French collectivités territoriales — municipalities, intercommunalités, departments, and regions — occupies a distinct space within financial analysis. The budgetary, accounting, and institutional logic is fundamentally different from that of a private company. Two major regulatory developments in 2024 and 2025 have reshaped the landscape: the full rollout of the référentiel M57 accounting framework across all local public entities, and the progressive introduction of the unified financial statement (compte financier unique, or CFU). Both changes affect the data available, the format of accounts, and the analytical benchmarks that matter.

The need for independent advisory support typically arises at sensitive junctures: budget preparation, pressure on gross savings, financing a multi-year capital programme, end-of-mandate review, or a desire for clearer financial visibility for the executive team and elected members. The objective is not simply to read the numbers. It is to understand what they still allow, what they already constrain, and which decisions must be made in advance.

In brief: the financial health of a French collectivité is assessed through a small set of structural indicators — gross savings (épargne brute), net savings (épargne nette), and debt repayment capacity (capacité de désendettement) — read within the M57 framework and cross-referenced with the capital investment trajectory. The role of an advisory firm is to objectify these benchmarks and help prioritise trade-offs, without substituting for the statutory oversight powers of the chambres régionales des comptes.

A private company is managed for value: revenue, margin, net income, free cash flow. A French collectivité territoriale has no profit objective. It must fund public services, maintain a legally required balance between operating revenue and expenditure, and sustain its investment capacity within a regulated framework.

Several structural differences are worth highlighting for an international reader.

First, French public budget law imposes real balance rules. It is not legally possible to vote a deficit budget on the operating section (section de fonctionnement). This constraint does not apply in the private sector.

Second, revenues are largely administered: local direct taxation (taxe foncière, cotisation foncière des entreprises), state grants (notably the dotation globale de fonctionnement, DGF), subsidies, and regulated borrowing. A collectivité does not sell a product: its resources depend on national political decisions, equalisation mechanisms (péréquation), and local tax bases.

Third, the analysis covers two distinct sections — operating and capital investment — and the flows between them (gross savings, net savings). Neither section can be read in isolation.

Finally, the budget calendar is specific to the public sector: orientations debate, initial budget vote, amending decisions, and financial account (now the CFU). This rhythm has no equivalent in corporate accounting.

Our read: the most common confusion we encounter in client files is treating épargne brute as equivalent to a net profit. It is not: it measures the capacity to self-finance capital investment. A collectivité with high gross savings but a structurally heavy debt burden is not necessarily in good financial health — and the reverse also holds.

It is essential to distinguish between the different actors, because their roles, powers, and purposes differ significantly. Conflating statutory oversight with advisory consulting generates frequent misunderstandings.

The chambres régionales des comptes exercise jurisdictional control: they audit the accounts of public accountants, review the management of local authorities and their associated bodies, and may issue binding recommendations. This control is entirely distinct from — and does not substitute for — a financial advisory engagement.

The role of an accounting and advisory firm is strictly within the advisory sphere: prospective analysis, data reliability assessment, budget reading support, risk identification, and production of management tools. It holds no legal control function over public accounts.

The underestimated risk: some collectivités wait for a CRC observation before acknowledging a financial drift. An early-stage advisory engagement — even a light one — frequently allows anticipation and correction before the situation becomes public and politically exposed.

The référentiel M57#

The référentiel M57 is the unified budgetary and accounting instruction for the French local public sector. Mandatory from 1 January 2024 for all collectivités territoriales and their administrative public establishments, it replaces the previous sector-specific nomenclatures: M14 for municipalities, M52 for departments, M61 for regions, M71 for syndicates, and others.

Two versions apply based on entity size:

• Full version: municipalities with 3,500 or more inhabitants, and equivalent entities.
• Abbreviated version: municipalities with fewer than 3,500 inhabitants, with a simplified nomenclature.

Some entities retain their own framework: industrial and commercial public services (SPIC, référentiel M4), public health establishments (M21), and social and medico-social establishments (M22).

For advisory purposes, the generalisation of M57 is a positive development: it standardises data, facilitates cross-entity comparisons, and makes analyses more robust. In practice, however, it requires an adaptation period, particularly for collectivités transitioning from a less familiar nomenclature whose finance departments have not yet fully integrated the new accounting lines.

The compte financier unique (CFU)#

The compte financier unique merges two documents that previously coexisted: the compte administratif (produced by the ordonnateur — the mayor or president) and the compte de gestion (produced by the comptable public). This dual structure generated discrepancies, delays, and reading complexity that added little value to decision-making.

The CFU is a prerequisite for any future certification of local public accounts. Its rollout is progressive, and mastery of M57 is its technical precondition.

For finance directors, the transition to the CFU represents an opportunity: a single document, more readable, better suited to presentation to elected members and financial partners. It is also a non-trivial workload to anticipate and plan for.

The goal is not to accumulate data. It is to select the few benchmarks that genuinely support decision-making.

All thresholds are indicative and reflect common financial analysis practice. They do not constitute legal standards and must be interpreted in light of each entity's profile, size, local context, and financial trajectory.

A concrete numerical example#

Consider a mid-sized municipality of approximately 15,000 inhabitants, with the following year-N execution data:

• Real operating revenue: €18 million
• Real operating expenditure: €15.6 million
• Gross savings: €2.4 million, representing 13.3% of operating revenue — a comfortable level
• Capital debt repayment: €1.1 million
• Net savings: €1.3 million — positive; the municipality can partially self-finance investment
• Total outstanding debt: €22 million
• Debt repayment capacity: 22 / 2.4 = 9.2 years — intermediate level, to be monitored if a significant investment programme is contemplated

In this scenario, the municipality can reasonably consider additional borrowing for a structural project, provided the debt repayment capacity does not exceed 12 years and net savings remain positive. If the planned investment pushes the ratio to 14 years, either part of the programme must be deferred or a revised fiscal trajectory must be planned.

This type of projection is precisely the work of a financial advisory engagement.

The following steps reflect how a well-constructed engagement is typically structured:

1. Define the central question: financial sustainability? Budget preparation? End-of-mandate review? Capital programme financing? A single engagement cannot cover everything simultaneously.
2. Collect and validate data: initial budget, financial account (or compte administratif), monthly accounting position, debt schedule, existing financial forecast, HR data if payroll is a central concern.
3. Analyse sections and flows: operating section, capital section, carried-forward results, outstanding commitments (restes à réaliser), and cash position.
4. Calculate structural indicators: gross savings, net savings, debt repayment capacity, expenditure rigidity, debt ratio.
5. Contextualise the trajectory: comparison across past financial years, three-to-five-year projections, identification of potential break points.
6. Produce actionable trade-offs: which scenarios? Which risks? Which decisions are priorities and in what timeline?
7. Tailor the restitution to the audience: executive team, finance committee, elected members — the same finding needs different framing for each.

Scenario 1 — An intercommunalité preparing a new capital investment programme

In an EPCI we supported, elected members wished to launch an ambitious multi-year investment programme from the start of the mandate. Analysis of the financial trajectory showed that while net savings were positive, the debt repayment capacity would exceed 13 years if all projects were launched simultaneously. We proposed a sequencing across two mandates, with a monthly dashboard to monitor phased execution. This framing enabled the programme to proceed within a sustainable envelope.

Scenario 2 — A municipality facing rising staff costs

Payroll represented 58% of real operating expenditure and had grown at 3.5% per year for three consecutive financial years. The analysis decomposed the trend into three components: the automatic career and seniority progression effect (GVT), discretionary post creations, and regulatory increases to the index point value. Only the second component was manageable in the short term. This framing allowed the executive team to present a nuanced picture to elected members, well removed from a narrative of uncontrolled drift.

• Reasoning as in a private company and conflating épargne brute with profit.
• Multiplying indicators to the point of drowning the reading: five well-understood indicators outperform thirty poorly appropriated ones.
• Analysing accounts without examining the trajectory: a snapshot is not sufficient.
• Decoupling the voted budget, actual execution, and political strategy.
• Waiting for a CRC observation before conducting a substantive financial review.
• Treating the transition to M57 as a mere administrative formality: the new nomenclature changes imputation lines and can distort ratios if not handled carefully.

For further reading on financial management tools, see our articles on financial reporting and monthly reporting. For a broader introduction to what an audit entails, see what is an audit.

Our strategy and evaluation advisory service also covers para-public entities and associations linked to local authorities.

Up to date as of 2026-05-26. This article is for information purposes and does not substitute for personalised professional advice. For your specific situation, consult a registered expert-comptable or qualified public-sector financial adviser.