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The article estimates the cost of the recent reform of the French school-week schedule to municipalities. Detailed data from both the municipal financial accounts and the timetables of each school are used. This makes it possible to differentiate the impact of the reform on expenditure by type of expense (operating grants, staff costs, general expenses), and to differentiate the financial impact of the reform according to the modalities of its implementation. The estimates reveal a significant gross cost of the reform to municipalities, exceeding 200 euros per pupil, which may however vary significantly depending on the timetable configurations chosen.