Employment Rights Act unfair dismissal dates explained

If you opened this statutory instrument and immediately felt lost, you are not alone. The document published on legislation.gov.uk on 26 May 2026 does not create a whole new unfair dismissal system by itself. Its job is narrower, but still important: it tells us when parts of the Employment Rights Act 2025 start to take effect. That matters because employment law often changes in stages. One date switches on a power, another date brings in the main rule, and a separate set of transition rules decides which cases sit on which side of the line. This regulation is a clear example of that.

The first date to circle is 1 July 2026. On that day, only a limited slice of section 25 comes into force, alongside paragraph 5 of Schedule 3. The explanatory note says this early start is there so ministers can make further consequential amendments linked to the repeal of section 124 of the Employment Rights Act 1996. In plain English, consequential amendments are tidy-up changes to other bits of law so that everything still matches after the main reform. **What this means for most workers and employers:** 1 July 2026 is mostly an enabling date, not the moment when the wider unfair dismissal changes fully bite.

The main date is 1 January 2027. From then, the rest of section 25 and the rest of Schedule 3 come into force, unless one of the transitional or saving rules says otherwise. The statutory instrument explains that these provisions relate to unfair dismissal, with section 25 also touching on the qualifying period and compensation. So if you are asking when the substantive unfair dismissal changes really start, 1 January 2027 is the date to keep in view. July matters for the legal groundwork, but January is the bigger switch-on point.

The most important practical detail sits in regulation 4. Some amendments will apply even where an employee is dismissed before 1 January 2027, as long as the effective date of termination falls on or after 1 January 2027. The same amendments will not apply where the effective date of termination falls before 1 January 2027. That can sound dry, but the idea is simple. If somebody is told in December 2026 that their job is ending, but their legal end date falls in January 2027, the new rules may still apply. If the effective date of termination falls in December 2026, they do not.

This is why the phrase "effective date of termination" matters so much. The regulation borrows that term, and the meaning of "dismissed", from Part 10 of the Employment Rights Act 1996. In other words, the law does not only care about when a difficult conversation happens; it cares about the legally recognised end date too. **What it means for you:** if a dismissal, notice period or contract end runs across the New Year, the calendar date on the letter may not be the whole story. Workers, managers, union reps and HR teams will all need to check exactly when the employment ends in law.

There is also a saving provision tucked away in regulation 4(3). It says the amendment made by section 25(4) of the 2025 Act does not disturb regulations that were already made under section 209(5) of the Employment Rights Act 1996 under the old wording of that subsection. That may feel like a small technical point, but it serves a useful purpose. It helps stop older secondary legislation from being accidentally knocked out just because Parliament has updated the parent Act. For students of how law works, this is a useful reminder that legal change often depends on careful housekeeping.

The wider lesson is that not all legal reforms arrive in one clean moment. This statutory instrument, signed by Kate Dearden at the Department for Business and Trade on 26 May 2026, shows the usual pattern: an early technical commencement on 1 July 2026, the main commencement on 1 January 2027, and special rules for cases that sit awkwardly between those dates. The explanatory note also points readers to impact assessments first prepared for the Employment Rights Bill introduced on 10 October 2024, with updated analysis published on 7 January 2026. If you are teaching, studying or simply trying to keep up, that is the real takeaway: when the law says a change starts can matter just as much as what the change says.