Direct answer: The UK Skilled Worker and several related immigration rule changes take effect on 22 July 2025.

Summary and context

  • The government published a Statement of Changes and related guidance in early July 2025, and the main package of Skilled Worker reforms was implemented on 22 July 2025.
  • Some separate measures (for example, the closure of ARAP to new principal applications) were brought into force earlier at 15:00 BST on 1 July 2025 as set out in the explanatory memorandum.

What “MAC changes to SWV UK” likely means

  • If by “MAC” you mean the Migration Advisory Committee and by “SWV” you mean the Seasonal Worker Visa or Skilled Worker Visa, there are two related threads: the government implemented a set of Skilled Worker reforms on 22 July 2025, and the MAC has been scheduled to publish reviews and lists (including temporary shortage lists) at later dates (for example discussions and expected outputs around mid-2026).

Useful specific dates

  • 1 July 2025, 15:00 BST — certain specific changes (e.g., ARAP closure to new principal applications) came into effect.
  • 22 July 2025 — principal implementation date for the main Skilled Worker visa rule changes.

How this affects applications and employers

  • From 22 July 2025 new salary thresholds, higher skill requirements, and new shortage lists began to apply to Skilled Worker applications.
  • Transitional arrangements were announced for some existing visa-holders; separate technical changes were published in the HC 997 Statement of Changes.

If you meant a different specific change

  • If you meant a particular MAC publication (for example the MAC’s final review or a Temporary Shortage List release expected in July 2026), that is a different date and not the 22 July 2025 implementation; the MAC’s own outputs were expected at later points (e.g., July 2026 for certain lists/reviews).

Bottom note
Information gathered from public announcements and government/expert briefings published in July 2025 and later.