UK unfair dismissal rules start in January 2027

If you glanced at this statutory instrument and thought it looked unreadable, you are not alone. The short version is that the Government has now set the timetable for when parts of the Employment Rights Act 2025 on unfair dismissal start to apply. According to the legislation.gov.uk text, the regulations were made on 26 May 2026 and signed by Kate Dearden at the Department for Business and Trade. For most readers, the date to remember is 1 January 2027. That is when the main unfair dismissal provisions in section 25 and the related amendments in Schedule 3 are due to come into force, with a smaller, more technical step happening earlier on 1 July 2026.

These rules do not create a brand-new policy out of nowhere. They are commencement regulations, which means they switch on parts of an Act that Parliament has already passed. In other words, the big decision sits in the Employment Rights Act 2025; this statutory instrument tells you when the legal changes start to bite. **What this means:** if you are a worker, a manager or a union rep, this is less about a new headline and more about timing. The law on unfair dismissal is being turned on in stages, and those stages matter if a case lands close to the end of 2026.

The first stage arrives on 1 July 2026, but it is narrow. The explanatory note says only part of section 25(5) is being commenced at that point, along with paragraph 5 of Schedule 3. The reason is procedural: it lets ministers use a power to make further consequential amendments linked to the repeal of section 124 of the Employment Rights Act 1996. That sounds dry, because it is. But it also tells you something useful: July is mainly a legal housekeeping date. The wider unfair dismissal changes most people will care about are still set for January.

Then comes 1 January 2027. From that date, the rest of section 25 and the rest of Schedule 3, so far as they are not already in force, are due to start. The text describes these provisions as relating to unfair dismissal, including rules connected to the qualifying period and compensation. For employers, that means HR policies, dismissal letters and notice calculations need to be checked well before the new year. For employees, it means any case around that handover point could depend on exactly when employment legally ends, not simply when the conversation happened.

This is the part worth slowing down for. Regulation 4 says the amendments can apply even where a person is dismissed before 1 January 2027, so long as the effective date of termination falls on or after 1 January 2027. If the effective date of termination falls before that date, the amendments do not apply. **What it means:** imagine someone is told in December 2026 that their employment will end in January 2027 after notice has run. In that kind of case, the January timetable may matter. The law is telling us to look closely at the official end date of the job.

The regulations borrow the meanings of 'dismissed' and 'effective date of termination' from Part 10 of the Employment Rights Act 1996. In plain English, the effective date of termination is the legal date the employment ends. That can be the same day a dismissal is announced, but it is not always. This is why technical wording matters. A case can sit on one side or the other of a legal change depending on notice periods, final dates and paperwork. If you are reading these regulations because of a real dispute, the calendar is not a small detail; it may be the detail.

There is one more piece of legal housekeeping. Regulation 4 also says an amendment made by section 25(4) does not disturb regulations already made under section 209(5) of the 1996 Act as that subsection stood before the change. That is a saving provision: its job is to stop older rules being accidentally swept away. The explanatory note also points readers to the Government's impact assessments for the Employment Rights Bill, first published when the Bill was introduced on 10 October 2024 and updated on 7 January 2026. So, if you strip away the legal language, the message is simple. July 2026 is mostly preparation. 1 January 2027 is the main unfair dismissal start date. And if a dismissal happens around then, the date employment ends could be the point that decides which rules apply.