French Economists Propose Broader Income Tax Base and Flat Withholding Rate to Fix Public Finances

Why Two French Economists Want to Widen the Income Tax Net

France’s public accounts are under mounting strain. Two senior economists from the French Observatory of Economic Conditions argue that piecemeal spending cuts are not enough — and that any credible deficit reduction must also tackle the country’s skewed tax burden. In a column published in Le Monde, they propose broadening the income-tax base to include revenues currently exempt, while introducing a single flat-rate withholding levy.

The backdrop is one of successive geopolitical shocks, accelerating climate adaptation costs, and a demographic squeeze from falling fertility and an ageing population. Allègre and Timbeau warn that a budget repair effort that ignores the parallel rise in household savings risks tipping France into a deep recession. Instead, they say taxing the wealthiest — where much of that untapped savings sits — is unavoidable.

The column directly counters Prime Minister’s recent endorsement of a “Gaullist” approach of mobilising private wealth through patriotic foundations rather than taxation. The economists dismiss this as wishful thinking: fortunes are often tied to multinationals that threaten to relocate at the first serious tax debate. Genuine fiscal justice, they maintain, cannot depend on the goodwill of billionaires.

What a Broader Tax Base and Flat-Levy Would Mean for France

The Core of the Proposal: Tax Revenues That Currently Escape the Net

The centrepiece is the introduction of a single flat-rate levy applied to a wider pool of income — specifically, revenues that currently enjoy complete exemption from income tax. While the article does not name the exact categories, historically these could include certain capital gains, life-insurance pay-outs, or income from specific financial products. The proposal echoes long-standing criticism that France’s tax base has been hollowed out by exceptions, making the system simultaneously less progressive and less efficient.

Why the Government’s “Patriotic Philanthropy” Model Falls Short

The economists push back against the idea — recently floated by Sébastien Lecornu and endorsed by the Prime Minister — that billionaires can be nudged, through tax incentives at the time of succession, to fund education, defence, research and climate adaptation. The problem, they note, is one of democratic legitimacy and reliability: the state cedes priority-setting to private individuals with no accountability, and the resources may vanish if the tax climate turns less favourable.

The Savings Conundrum and the Recession Risk

Allègre and Timbeau frame the issue within a broader macroeconomic logic. Since France’s public deficit has widened even as household savings have grown, simply cutting spending without simultaneously drawing down those savings would depress demand and deepen a recession. A tax on the wealthiest is presented not just as a fairness tool but as a stabiliser — recirculating idle savings into public investment without a sharp fiscal contraction.

What This Policy Push Signals for Households, Investors, and the Government

• For high-net-worth individuals and family offices: If a broader base and flat withholding rate gains traction, expect discussions on which capital-market or insurance revenues would lose their exempt status. The debate will likely target instruments perceived as tax shelters.
• For members of parliament and the executive: The column signals that leading economic voices from OFCE are building the intellectual case for base-broadening as the next phase of fiscal consolidation — a stance that could influence the legislative agenda ahead of the 2027 budget talks.
• For the broader public: While no bill is on the table, the proposal reignites the question of how France will fund soaring climate and demographic bills. Any move to tax currently exempt income may eventually affect dividend recipients, life-insurance holders, and owners of certain financial products.