When does the time limit to bring an unfair dismissal claim start?

The 3-month limit generally starts from the date of dismissal and can pause or extend in certain circumstances.

Under the Employment Rights Act 1996, most unfair dismissal claims must be brought within 3 months from the date of the dismissal. This three-month period is the standard time limit for bringing a claim to an Employment Tribunal.

If there are multiple events or if a person is treated in a way that amounts to dismissal over a period, the clock usually starts from the date of the last relevant event. This ensures it captures the point from which the employee has a legitimate right to complain.

The tribunal can also extend the period beyond three months where it is satisfied that it was not reasonably practicable to present the complaint within the initial window. In those situations, the tribunal may allow a further period it considers reasonable.

Understanding the 3-month deadline and how it is calculated

3 months is a calendar-based window, with extensions possible for practicable reasons.

Three months means three calendar months from the relevant date. If the last day of the three-month period falls on a weekend or public holiday, you typically have until the next working day to lodge a claim.

For unfair dismissal, the three-month window is the standard requirement under ERA 1996 s111(2). The clock may be extended by the tribunal for a period it regards as reasonable if it was not reasonably practicable to file on time.

In practice, many factors can affect how deadlines are viewed; the tribunal will look at the circumstances, including the reasons for any delay and whether the employee acted promptly once aware of the right to complain.

If you are unsure about dates, seek early guidance from ACAS or a legal adviser to avoid missing the deadline.

• Deadline is usually three months from dismissal
• If the deadline falls on a weekend/holiday, count to the next working day
• Tribunal can extend if it was not reasonably practicable to file on time
• ERA 1996 s111(2) establishes the base period

Extensions: just and equitable reasons to allow more time

The tribunal can grant additional time beyond 3 months for just and equitable reasons.

The tribunal has the power to extend the time limit beyond three months if it is satisfied that it was not reasonably practicable to present the complaint within the initial period. This is framed as allowing “such further period as the tribunal considers reasonable.”

Common justifications include serious illness or unavoidable personal circumstances that prevented timely filing, or delays caused by waiting for information from the employer. The tribunal will assess the circumstances and may require supporting evidence.

Even where a longer period is allowed, the claimant should still act promptly once the reasons for delay are removed to avoid further complications.

• Not automatic: application for extension must be considered by the tribunal
• Common reasons: illness, disability, difficulty obtaining information
• Evidence may be requested by the tribunal

ACAS Early Conciliation: how it affects time limits

ACAS conciliation can impact the deadline; a certificate is issued; the period may be extended.

Before raising a claim, you usually must contact ACAS to start Early Conciliation. Once conciliation begins, ACAS issues a certificate and a formal record of the process.

The time limits can be affected by EC in two ways: the three-month clock may be paused during the conciliation, and there is also a statutory provision allowing time limits to be extended to facilitate conciliation before proceedings start.

The exact impact depends on the case, but the principle is to give parties a genuine chance to settle before going to tribunal. Regulatory references include provisions that the tribunal can extend time limits to support conciliation before institution of proceedings, and there are mentions of cross-border mediation provisions in some contexts.

Tip: If you plan to pursue EC, start early to avoid missing deadlines and keep records of all communications.

• ACAS EC starts the clock for many claims
• A certificate is issued after EC begins
• EC can pause the three-month limit or allow extensions to facilitate conciliation

Other special circumstances and further extensions

There are additional rules and circumstances that can affect any time limits.

The three-month limit is the general rule for unfair dismissal, but other limited scenarios and regulations may apply to related claims (for example, claims under different statutory regimes).

Where special circumstances apply, the tribunal has discretion to consider extending time limits beyond the standard three months to achieve a fair outcome. The exact rules depend on the statutory framework and the tribunal's assessment of the case.

• There are other statutory time limits for related issues
• Extensions are discretionary and case-specific

A practical timeline and steps to protect your claim

A simple, practical plan to identify deadlines and protect your claim.

1. Identify the date of the dismissal or the relevant incident that starts the clock.

2. Check whether ACAS Early Conciliation is used and obtain the EC certificate if applicable.

3. Gather all relevant documents, dates, and communications to support your claim.

4. If you are within three months, file the claim; if you are close to the deadline, consider requesting an extension and/or continuing EC.

5. If you miss the deadline, speak to ACAS or a legal adviser about options and potential extension.

• Create a timeline of key dates
• Keep copies of communications with employer and ACAS
• Act promptly if you think you might miss the deadline

1. Step 1: Note the dismissal date and any subsequent events that may affect the claim window
2. Step 2: If pursuing EC, obtain the certificate and log EC dates
3. Step 3: Prepare evidence and lodge the claim within the time window or apply for an extension
4. Step 4: If time is running out, seek early legal advice