Understanding Limitation Periods for Dismissal Claims

When an employee believes they have been unfairly dismissed, statutory time limits - known as limitation periods - determine how long they have to start a claim in an employment tribunal. These deadlines are strict and, if missed, a claim is likely to be dismissed unless exceptional circumstances apply. This article explains how limitation periods work, when they start, how early conciliation affects them, ongoing legislative reform, and practical points for employees and employers.

Why Limitation Periods Matter

Limitation periods are legal deadlines within which a claim must be brought. In employment law in England and Wales, most disputes must be presented to the employment tribunal within a specified period from the date of the dismissal or relevant act. Tribunals enforce these periods strictly because they promote certainty and fairness for both parties and prevent “stale” claims where evidence may no longer be reliable.

Understanding limitation periods is essential before starting any tribunal process, including unfair dismissal claims, because failing to comply can mean losing the right to a hearing on the merits of the case.

Core Time Limits for Dismissal Claims

Unfair Dismissal Claims

For most unfair dismissal claims, the primary time limit is three months less one day from the effective date of termination (EDT).

• The effective date of termination is usually the date on which employment ends, which may be:
  • the last day of notice if the employer gave notice;
  • the date notice was given if the employer did not require the employee to work their notice; or
  • the date of dismissal in cases of summary dismissal (for gross misconduct).

This strict deadline means that, in most cases, an unfair dismissal claim must be notified to Acas - as part of the mandatory early conciliation process - within that three‑month window.

Other Time Limits That May Apply

A small number of claims related to dismissal attract a longer limitation period:

• Statutory redundancy pay claims: six months from the relevant date.
• Equal pay claims (including those connected to dismissal): generally six months.
• Unfair dismissal connected to strike action or certain trade union matters: six months.

It is important to identify the correct category of claim early, because the appropriate time limit depends on the legal basis of the complaint.

How Time Limits Are Calculated

Starting Point: Date of Dismissal

For unfair dismissal claims, the clock runs from the effective date of termination. This may not always be the same as the date the dismissal letter was issued. For example, if an employee is given one month's notice but continues working during that month, the time limit starts from the expiry of that notice.

Single Acts vs Continuing Series

Most dismissal claims relate to a single act - the termination of employment. In other types of claims (such as discrimination), the limitation period starts at the date of the last act complained of. However, for dismissal claims it is usually clear‑cut: the date employment ends triggers the deadline.

Early Conciliation and How It Pauses the Clock

The Role of Acas Early Conciliation

Before lodging a claim with an employment tribunal, a prospective claimant must notify Acas to initiate early conciliation. This is a free, confidential process aimed at resolving disputes without a tribunal hearing.

Importantly, when you notify Acas within the original time limit, the limitation period is paused (stopped) for the duration of the early conciliation process.

Once early conciliation ends, the clock starts again from the new date, and a claimant usually has at least one calendar month from the date the Acas certificate is issued to submit the tribunal claim (ET1).

Practical Effect of Pausing

Pausing the time limit protects employees from having their claim time out while settlement negotiations take place. For example:

• An employee dismissed on 1 May normally has until 31 July to notify Acas.
• If they notify Acas within that period, the clock stops while conciliation continues.
• After the Acas certificate is issued, an additional period applies to file the tribunal claim.

This mechanism means that early conciliation effectively extends the real time available to bring a claim, although the original three‑month limitation remains the starting point.

Proposed and Imminent Changes to Limitation Periods

Potential Extension to Six Months

Under the Employment Rights Bill, the Government has proposed increasing the primary time limit for many employment tribunal claims - including unfair dismissal and discrimination - from three months to six months.

If enacted, this reform would provide employees with a longer window to start early conciliation and lodge claims, potentially reducing the pressure to act immediately after dismissal. However, secondary legislation would be required before the change takes effect, and its implementation is expected in future years.

Changes to Early Conciliation Duration

From 1 December 2025, the maximum period for Acas early conciliation is being extended from six weeks to twelve weeks. The limitation period remains paused during this extended conciliation window, which has the effect of increasing the potential overall timeframe before a tribunal claim must be submitted.

The extended early conciliation period may lead to longer effective limitation windows, especially when combined with the one‑month period to submit a claim after a certificate is issued.

Extensions of Time and Tribunal Discretion

Late Claims: Tribunal Discretion

Employment tribunals have limited discretion to allow claims to proceed after the limitation period has expired in certain circumstances. These are exceptional and typically hinge on demonstrating that it would be “just and equitable” or that it was not reasonably practicable to comply with the deadline. However, tribunals apply these tests narrowly, especially for unfair dismissal claims.

Importance of Compliance

Because extensions are not routinely granted, it is generally advisable to issue a claim within the prescribed time limit, or at least initiate early conciliation in time to preserve rights. Missing deadlines without strong justification places claims at material risk of being struck out.

Practical Steps for Employees and Employers

For Employees

• Identify the correct date on which your dismissal took effect (EDT).
• Contact Acas early and within the limitation period to pause the clock.
• After receiving your Acas certificate, prepare and submit your ET1 tribunal claim promptly, mindful of the additional one‑month period.
• Seek legal advice if time limits are close or if dismissal covers multiple potential claims (e.g. discrimination alongside unfair dismissal).

For Employers

• Maintain clear records of dismissal dates, notices and contractual terms to avoid disputes about the effective date of termination.
• Recognise that extended early conciliation periods provide longer windows for potential claims.
• Respond to Acas notifications promptly, whether engaging in conciliation or preparing for a possible tribunal.

Common Questions About Time Limits

Q: Does going through internal procedures like grievance or appeal extend the time limit?
No. Grievance, disciplinary or appeal procedures do not change or pause the statutory limitation period - only notifying Acas for early conciliation does this.

Q: Can discrimination elements of a dismissal claim have a different deadline?
Yes. If discrimination is alleged alongside dismissal, time limits are measured from the date of the last discriminatory act.

Q: What if I miss the time limit?
A tribunal may allow a late claim only in very limited circumstances and at its discretion. It is usually difficult to obtain an extension without exceptional justification.

Key Takeaways

Limitation periods define the window within which dismissal and related employment tribunal claims must be brought in England and Wales. For most unfair dismissal claims, the time limit is three months less one day from the effective date of termination, but this period is paused during mandatory Acas early conciliation and may be extended in future under proposed law reforms. Rarely, tribunals can allow late claims if justified, but it is essential to act promptly. Understanding and calculating deadlines accurately is crucial to protecting legal rights in workplace disputes.