The Act lands in stages between December 2025 and 2027. This is the dated, source-checked map of what is already in force, what is coming and when, and what…
The Employment Rights Act 2025 is not a single event. It is a programme of changes that commence in tranches between December 2025 and the end of 2027, and the dates matter as much as the substance — because some are firm, some are "no earlier than," and several originally promised for 2026 have already slipped into 2027. An employer preparing for it needs the calendar, not just the headlines.
This guide is that calendar. It is organised by date, it marks each item as already in force or still to come, and for each one it says briefly what the change asks an employer to do. Every date is taken from Acas (the public body whose guidance on this is authoritative; last updated 11 June 2026) or the commencement regulations themselves, and where Acas uses cautious "no earlier than" language this guide keeps it, because the honest state of the timetable is part of what an employer is planning around.
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