With the Acas early conciliation period now able to run to twelve weeks, the tribunal deadline is a computed date, not a guessed one. This worked-arithmetic guide runs three fact patterns – unfair dismissal, discrimination and unpaid wages – through the Day A and Day B rules, shows exactly where the one-month floor bites, and sets out the calendar discipline a claimant needs, including what changes when six-month limits arrive on 1 October 2026.
The structural reform campaigners proposed has not happened: the Office of the Whistleblower Bill fell when the 2024–26 session ended, and no whistleblowing bill is before the current Parliament. But the law has not stood still — sexual harassment is now an express qualifying disclosure, the prescribed-persons list has been expanded twice, and tribunal time limits are about to double. An evidence-led state of play, measured against what reformers asked for.
Nine months after Royal Assent, the Employment Rights Act 2025 is a half-built statute. Tribunal time limits double on 1 October 2026, but the unfair dismissal changes do not begin until January 2027 — and for dismissal the test is the date the employment ends, not the day the decision is announced. A state-of-play guide to what is in force, what is not, and how to time a claim in the overlap.
Do not assume you have six months to bring an Employment Tribunal claim. Current time limits, Acas early conciliation and interim relief still need urgent case-specific checking.
