Common Mistakes in Employment Tribunal Claims

Employment tribunal claims in England and Wales are a key route for workers to enforce statutory and contractual employment rights, such as unfair dismissal, discrimination, unlawful deduction of wages and breach of contract. However, many claimants - especially those representing themselves - make avoidable procedural and substantive errors that can weaken their case or even lead to dismissal on technical grounds. Understanding the most common mistakes helps prospective claimants prepare stronger cases and reduces the risk of unnecessary delays, loss of rights, or reduced compensation awards.

1. Misunderstanding Time Limits and Early Conciliation

Missing Critical Deadlines

One of the most frequent and serious errors is misunderstanding tribunal time limits. Many claims must be submitted within three months less one day of the act being complained about (e.g., dismissal or last discriminatory act). Some claims, such as statutory redundancy pay or equal pay, allow six months less one day. Failure to comply usually means the claim is out of time and may be dismissed before the merits are considered.

Miscalculating Time Limits Around Early Conciliation

Before bringing most tribunal claims, the claimant must notify ACAS and engage in early conciliation. A common mistake is assuming that contacting ACAS automatically extends the deadline; in fact, early conciliation pauses the time limit from the date ACAS receives the notification until the early conciliation certificate is issued. Only once the certificate is issued does the time limit restart. Many claimants misunderstand this “stop the clock” effect, leading to late filing after early conciliation concludes.

Failing to start early conciliation before the statutory deadline does not revive the time limit. If EC is begun after the primary period has expired, a claim will usually be treated as out of time unless a tribunal exercises its limited discretion - which is rare.

Tip: Mark all key dates - event giving rise to the claim, early conciliation notification, certificate issue date - and calculate deadlines carefully.

2. Incorrect or Incomplete Tribunal Forms

ET1 Form Errors

Preparing the ET1 claim form incorrectly is a common procedural error. It is vital to include accurate details, including correct employer names and addresses, the ACAS early conciliation certificate number(s), and precise dates of the relevant facts. Submitting incorrect information - particularly the ACAS certificate number - can lead to rejection, though tribunals now have some discretion to allow correction in the interests of justice if errors are minor.

Failing to Add Other Respondents

Some claimants mistakenly omit relevant respondents (for example, multiple employers or associated companies) on their ET1. If the claim relates to more than one respondent, additional parties should be included as soon as practical during early stages, otherwise tribunals may need to make separate orders later.

Tip: Double‑check ET1 details before submission and seek clarification if unsure about adding respondents or certificate references.

3. Poor Evidence Preparation

Overwhelming or Unfocused Evidence

Claimants often submit too much irrelevant material, such as every message or screenshot they can find. Tribunals prefer focused, well‑organised evidence that directly supports the legal issues in dispute. Excessive or disorganised bundles waste time and distract from key arguments.

Lack of Corroboration

Another common error is failing to support assertions with corroborating evidence. While witness testimony can be important, documentary evidence such as emails, contracts, meeting notes and contemporaneous records is often more persuasive.

Tip: Include only documents that directly relate to the legal issues, and organise them in chronological order with clear indexes.

4. Failing to Engage Appropriately with ACAS Early Conciliation

Claimants sometimes ignore or fail to engage fully with early conciliation, missing the opportunity to resolve disputes before they become formal tribunal claims. Early conciliation is intended to help both sides explore settlement and avoid the time and cost of full proceedings.

Some expect ACAS conciliators to act as advisers on the strength of the case or provide legal advice, but they are neutral facilitators who relay offers and defences between parties.

Tip: Use early conciliation proactively to clarify issues and explore settlement options while preparing a robust record of engagement.

5. Inadequate Internal Preparation Before Tribunal

Failing to Use Grievance and Appeal Procedures

Claimants sometimes skip internal procedures such as grievance or appeal processes before initiating a tribunal claim. While this does not affect time limits in most cases, properly using internal mechanisms can strengthen evidence of procedural fairness or unfairness and demonstrate procedural compliance or lack thereof.

Lack of Documentation

Not keeping proper records of meetings, performance reviews, warnings, disciplinary actions, and grievance outcomes can seriously undermine a claim. Tribunals rely on written records to assess the credibility and fairness of employer actions, and absence of documentation often benefits respondents.

Tip: Maintain comprehensive, dated records throughout employment and during disputes.

6. Misunderstanding or Misapplying Legal Concepts

Misclassifying Employment Status

A mistake both claimants and employers make is misclassifying a relationship - for example, treating a worker as a self‑employed contractor. Misclassification can lead to unexpected tribunal claims for rights such as unfair dismissal, holiday pay or minimum wage entitlements.

Weak Legal Framing of Claims

Failing to correctly articulate the legal basis of the claim - for example, confusing unfair dismissal with wrongful dismissal, or misunderstanding discrimination law elements - can result in claims being struck out or dismissed. Employers and employees alike should understand the legal tests and statutory definitions relevant to their case.

Tip: Before filing a claim, review relevant legislation and authoritative commentary or seek legal clarification on the appropriate cause(s) of action.

7. Missing Procedural Steps and Tribunal Orders

Failing to Respond to Directions

Tribunals often issue case management directions requiring disclosure of documents or witness statements by specific dates. Missing these deadlines or failing to comply with directions can lead to sanctions or adverse inferences.

Poor Use of Witnesses

Selecting inappropriate witnesses or preparing unhelpful witness statements is another common error. Witnesses should provide direct, relevant evidence, not general opinions or commentary.

Tip: Treat tribunal directions seriously and ensure compliance, and prepare witness evidence that aligns with key legal issues.

8. Avoiding Legal or Representative Assistance

Many claimants assume they can navigate tribunal procedures easily without support. Employment law is complex, and mistakes made through inexperience can be costly. Failure to engage qualified representation - whether from a solicitor, union adviser, or experienced advocate - often leads to procedural errors and weakened arguments.

Tip: Consider obtaining legal advice early to avoid errors in claim formulation, evidence preparation and procedural compliance.

Common Questions

What happens if I miss a time limit?
A tribunal will usually dismiss a claim that is out of time unless there is a compelling reason to extend the period under statutory tests. Early conciliation must be started within the original deadline to prevent claims from being late.

Can errors on the ET1 be corrected?
Minor errors, such as a wrong ACAS certificate number, may be allowed if the tribunal considers it in the interests of justice, but relying on this is risky.

Does ACAS give legal advice?
No. ACAS conciliators facilitate negotiation but do not provide legal advice on case merits or compensatory value.

Key Takeaways

Employment tribunal claims can be complex, and common mistakes often relate to procedural deadlines, early conciliation misunderstandings, inadequate evidence, and poor procedural compliance. Claimants and respondents alike should carefully track time limits, complete tribunal forms accurately, engage constructively with ACAS, maintain robust documentation, and understand legal requirements. Avoiding these common pitfalls improves the prospects of a successful claim or defence and helps manage time, cost and stress throughout the tribunal process.