The federal fiscal year runs from October 1 to September 30. So theoretically the budget for each department should have been done before September 30, 2025. This was done in the House in September, in December it was passed through the Senate.
https://appropriations.house.gov/sites/evo-subsites/republicans-appropriations.house.gov/files/evo-media-document/final-fy26-energy-water-minibus-summary.pdf
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