Prevents Executive agencies from carrying out reductions in force (RIFs) — including firings or formal staff cuts — during any lapse in appropriations. Any RIF actions taken in violation of this prohibition (including actions taken between October 1, 2025 and the day before this Act is enacted) are void, and the provision is treated as if enacted on September 30, 2025. The rule defines “Executive agency” by reference to existing law (5 U.S.C. 105) and preserves voluntary separation payments authorized under 5 U.S.C. 3523.