Missed the Employment Tribunal Deadline? You May Not Be as Late as You Think

Realising the tribunal deadline may have passed is a horrible moment. The employment tribunal time limits are famously strict, and missing one usually ends a claim before it starts. But "usually" is not "always", and two things are worth knowing before you give up: the deadline may not have passed at all once Acas early conciliation is factored in, and even if it has, tribunals do have a limited power to extend time. This guide explains both.

Deadlines are calculated, not estimated - last updated 1 July 2026: The standard time limit is 3 months less 1 day from the dismissal or the act complained of, but Acas Early Conciliation changes the maths. Work out your exact date with the tribunal deadline calculator and read the deadlines guide before assuming anything. The Employment Rights Act 2025 is expected to extend the general limit to 6 months, targeted for October 2026, but that is not yet in force.

First: are you actually out of time?

Before treating the deadline as missed, check whether it really is - because the calculation trips people up. Two things extend the deadline:

• Acas early conciliation. When you notify Acas, the clock stops while conciliation runs, and you get extra time afterwards. This means the real deadline is often weeks later than "3 months from the dismissal date". People who assume they are out of time sometimes are not.
• The specific act complained of. For a series of events, or a continuing act of discrimination, time can run from a later date than you think.

Work out your exact date first. If you are still in time, stop reading and act now - lodge your claim immediately, because every day of delay narrows your options.

If the deadline really has passed

If, having checked, the deadline genuinely has passed, the question becomes whether a tribunal will extend time. It has a limited power to do so, but the test depends entirely on your claim type - and the two main tests are very different in how demanding they are.

Unfair dismissal and most ERA claims: "not reasonably practicable"

For unfair dismissal and most claims under the Employment Rights Act 1996, a tribunal can only extend time if:

1. it was "not reasonably practicable" for you to bring the claim within the time limit, and
2. you then brought it within a further reasonable period

This is a strict test, and the burden is on you. Things that can sometimes satisfy it include a genuine, reasonable ignorance that you had a claim, serious illness that prevented you acting, or being actively misled about your rights or the deadline. Things that usually do not: simply forgetting, general delay in getting advice, or waiting for an internal appeal to conclude. "I didn't get round to it" is not enough.

Discrimination claims: "just and equitable"

For discrimination claims under the Equality Act 2010, the test is broader: a tribunal can extend time where it is "just and equitable" to do so. Here the tribunal weighs all the circumstances - why you were late, how long the delay was, whether evidence and memories are still fresh, and whether a fair hearing is still possible. It is a genuinely more forgiving test than "not reasonably practicable", so a discrimination claimant who is modestly late has a meaningfully better chance of being allowed to proceed. It is still discretionary, and still never guaranteed.

What to do if you think you are late

• Do not assume - calculate. Confirm your true deadline, including the Acas extension, before deciding you have missed it.
• Act immediately if there is any doubt. If you might still be in time, or only just out, lodging without further delay both preserves an in-time claim and strengthens any "further reasonable period" argument.
• Start Acas early conciliation now if you have not - it is a precondition to most claims and starting it is the first concrete step.
• Write down your reasons for the delay, with dates and any supporting evidence (medical notes, correspondence). If you are asking for an extension, this is the material the tribunal will weigh.
• Do not let a pending appeal stop you. An ongoing internal appeal does not pause the tribunal clock. Many claims are lost because people waited for the appeal outcome. If the deadline is close, lodge the claim and let the appeal run alongside.

If an extension is refused

If a tribunal decides not to extend time, the claim cannot proceed - the time limit is jurisdictional, meaning the tribunal has no power to hear an out-of-time claim it has declined to extend. That is why the limits are treated so seriously throughout the process, and why the single most valuable habit for any potential claimant is to get the deadline right at the very start. The what to do before a claim guide covers the early steps that keep your options open.

Key takeaway

Missing the tribunal deadline usually bars a claim, but two things are worth checking before you give up. First, you may not actually be out of time: Acas early conciliation extends the deadline, and many people who assume they are late are not. Second, even a genuinely late claim can sometimes be saved - narrowly for unfair dismissal under the "not reasonably practicable" test, more flexibly for discrimination under the "just and equitable" test. The one thing that never helps is waiting longer. If there is any doubt about your dates, calculate them now and act immediately.

_This article is legal information, not legal advice. Time limits and extension tests are strict and fact-sensitive; check your own dates and the current rules via the official sources linked above, or contact Acas._