What actually counts as your date of dismissal

Updated August 6, 2026

The date of dismissal, in law, is not the day you were told, the day you stopped attending, or the day your final pay landed. It's the effective date of termination (EDT), and which day counts depends entirely on how the dismissal happened: with notice, on the spot, or through a resignation forced by your employer's conduct.

The EDT anchors every other deadline

Every deadline in an employment dispute runs from the EDT. It's the date the tribunal clock starts, the date that decides whether you fall under the old three-month time limit or the extended six-month one that applies from 1 October 2026, and the date Acas early conciliation timing gets measured against. Get the EDT wrong and you can miscalculate your deadline by weeks, sometimes months. If you want the actual date worked out for your circumstances, the employment tribunal deadline calculator takes the EDT as its starting point and accounts for both the transitional rule and any Acas stop-the-clock period.

There are three common scenarios, and each fixes the EDT differently.

Dismissal with notice

If your employer gives you notice and you work it out, or you're put on garden leave for the notice period, the EDT is the date your notice period ends, not the date you were told you were being dismissed. Where your employer dismisses you with notice but pays you in lieu instead of having you work it (a PILON), the EDT is usually the date employment actually ends under that arrangement, so check your termination letter or contract for the exact wording used.

Worked example. Your employer tells you on 3 August 2026 that you're being dismissed and gives you your contractual eight weeks' notice. Your last working day, and the day your contract ends, is 28 September 2026. The EDT is 28 September, not 3 August. Because 28 September falls before 1 October 2026, this dismissal stays on the old three-month time limit, even though you might not decide to bring a claim until weeks after you were first told.

Summary dismissal (dismissal without notice)

Where you're dismissed on the spot, commonly for gross misconduct, with no notice period and no pay in lieu, the EDT is simply the date of dismissal itself. There's no notice period running down afterwards, so there's no later date to argue about.

Worked example. You're called into a meeting on 12 October 2026 and dismissed immediately for alleged gross misconduct, escorted out the same day with no notice given. The EDT is 12 October 2026. Because that date falls after 1 October 2026, this dismissal falls under the extended six-month time limit.

Constructive dismissal

This is the one people get wrong most often. Constructive dismissal happens when you resign because your employer has fundamentally breached your contract, and the law treats that resignation as a dismissal for tribunal purposes. The EDT is not the date the breach happened, and it isn't the date you decided to leave. It's the date your resignation actually takes effect, whether that's your last day worked or the end of a notice period you give.

Worked example. Your employer cuts your pay without agreement in July 2026, a clear breach of contract. You resign on 20 September 2026, giving four weeks' contractual notice. Your employment ends on 18 October 2026. That is your EDT, not the July pay cut and not the date of your resignation letter. Because the EDT falls after 1 October 2026, the extended time limit applies, even though the breach that drove you out happened months before the new rules came in. It's exactly this kind of gap between breach, resignation, and EDT that's worth checking against the timeline of what changed under the 2026 reforms, since the transitional rule looks at when the dismissal occurred, not when the breach did.

Statutory notice periods, for context

The notice period often sets the gap between the day you were told and the actual EDT. The statutory minimum, separate from whatever your contract says, depends on length of service:

Your contract can specify longer notice than this, and often does. It can't specify less. Whatever the real notice period turns out to be, in a dismissal-with-notice scenario, that's what pushes your EDT out beyond the day you were first told.

If you're not sure which scenario applies

Some cases are genuinely messy. A resignation sent "under protest" might count as constructive dismissal or might not. A PILON letter can be ambiguous about the actual end date. If you can't pin down your EDT with confidence, don't guess, and don't assume you have longer than you actually do. Read your termination letter or contract closely for the wording on when employment ends, and if the dismissal or the events leading up to it straddle 1 October 2026, treat the date with real care, because it decides which time limit regime applies to your claim.

Once you've worked out your EDT, the next step is turning it into an actual deadline, including any pause for Acas early conciliation. The tribunal deadline calculator handles that part, but it can only be as accurate as the EDT you feed into it, which is exactly why it's worth getting this date right before you do anything else.