NOAA's National Marine Fisheries Service (NMFS) issues this interim final rule pursuant to the authorities under sections 303(c), 304(b), and 305(d) of the Magnuson-Stevens Fishery Conservation and Management Act. NMFS and the Mid-Atlantic Fishery Management Council manage Atlantic mackerel under the Mackerel, Squid, and Butterfish Fishery Management Plan. During its August 2025 meeting, the Council initiated a framework adjustment to consider revisions to the mackerel rebuilding plan and set 2026-2027 mackerel fishery specifications. During its December 2025 meeting, the Council finalized its recommendations for the framework. This interim final rule would: Revise the mackerel rebuilding plan; set 2026 and projected 2027 mackerel fishery specifications; increase commercial mackerel possession limits; revise the mackerel fishery closure process; and establish increased mode-specific (i.e., private, for-hire) recreational mackerel possession limits. This interim final rule may also account for a potential overage of the 2025 mackerel annual catch limit (if necessary), and correct and streamline existing regulations that were implemented through previous regulatory actions.