Unfair Dismissal Claim: 5 Proven Legal Strategies
Losing your job unexpectedly is stressful enough without having to navigate employment tribunal rules on top of it. If you believe you were dismissed unfairly, an unfair dismissal claim can secure compensation or, in rarer cases, your job back — but tribunals scrutinise these claims closely, and small mistakes early on can weaken an otherwise strong case.
Employment lawyers see the same patterns again and again in the claims that succeed versus the ones that stall. Here are five strategies they consistently recommend to anyone considering a claim in England and Wales.
What Counts as Unfair Dismissal?
Under section 98 of the Employment Rights Act 1996, your employer must show a fair reason for dismissing you — typically capability, conduct, redundancy, a statutory restriction, or “some other substantial reason” (SOSR) — and must have followed a fair process in reaching that decision. If they can’t show both, the dismissal may be unfair.
There are two broad categories:
- “Ordinary” unfair dismissal — generally requires two years’ continuous employment with your employer (this qualifying period is due to reduce to six months for dismissals from 1 January 2027).
- Automatic unfair dismissal — covers protected reasons such as whistleblowing, pregnancy, or asserting a statutory right, and carries no minimum length-of-service requirement at all.
Strategy 1: Act Within the Time Limit — and Start ACAS Early Conciliation Immediately
The single biggest reason otherwise valid claims fail is missing the deadline. You generally have three months less one day from your effective date of termination to start the process (this window is set to extend to six months for most claims once the relevant provisions of the Employment Rights Act 2025 come into force).
Before you can submit a claim, you must notify ACAS for Early Conciliation and obtain a certificate — this is a mandatory step for almost all tribunal claims, including unfair dismissal. Contacting ACAS pauses your limitation clock while conciliation takes place, but it doesn’t reset it, so don’t wait until close to the deadline to start.
Employment lawyers recommend:
- Calculating your deadline the moment you’re dismissed, not weeks later
- Contacting ACAS as early as possible, even if you’re still deciding whether to proceed
- Double-checking the respondent’s name matches exactly across your EC certificate and your ET1 form, since mismatches can lead to a claim being rejected
Strategy 2: Build a Clear, Contemporaneous Evidence Trail
Tribunals weigh evidence heavily, and the strongest claims are built on documentation gathered as close to the events as possible, not reconstructed from memory months later. Lawyers typically advise clients to collect:
- Your employment contract, offer letter, and any staff handbook or disciplinary policy
- Payslips and P60s, to support any compensation calculation
- The dismissal letter and any correspondence explaining the reason given
- Emails, messages, and meeting notes relevant to the events leading to dismissal
- Notes of any disciplinary or grievance meetings, including who was present and what was said
- Details of comparators — colleagues in similar situations who were treated differently, if relevant
Where possible, write a chronological account of events shortly after they happen. A detailed, dated record is far more persuasive to a tribunal than a vague recollection put together after the fact.
Strategy 3: Use the Internal Appeal or Grievance Process First
It’s tempting to go straight to a tribunal claim, but lawyers generally recommend exhausting your employer’s internal appeal process first, where one exists. This matters for two reasons:
- It can resolve the issue faster, without the cost and time of tribunal proceedings.
- Tribunals expect it. Under the ACAS Code of Practice on Disciplinary and Grievance Procedures, an unreasonable failure to follow a fair process — by either side — can affect any compensation awarded, including adjustments of up to 25%.
If you haven’t already appealed your dismissal internally, check your contract or staff handbook for the relevant procedure and timeframe, and put your appeal in writing, referencing specific points you’re disputing.
Strategy 4: Understand What Remedy You’re Actually Seeking
Employment lawyers stress that a claim runs more smoothly when you’re clear from the outset about what outcome you want, because it shapes both your evidence and any settlement negotiations. The tribunal can award:
- Compensation — made up of a basic award (similar to statutory redundancy pay) and a compensatory award for financial losses, such as lost earnings
- Reinstatement — being given your old job back
- Re-engagement — being given a comparable job with the same employer
In practice, most successful claims result in compensation rather than reinstatement, since the working relationship has often broken down irretrievably by the time a case reaches tribunal. Preparing a schedule of loss early — a clear breakdown of your financial losses since dismissal — strengthens both your negotiating position and your case if it proceeds to a full hearing.
Strategy 5: Get Specialist Advice Before You File
Unfair dismissal law involves technical rules around time limits, qualifying periods, and procedure that are easy to get wrong without experience. Even where you intend to represent yourself, lawyers recommend getting at least an initial consultation to:
- Confirm you meet the qualifying criteria for your type of claim
- Sense-check the strength of your evidence and identify any gaps
- Review your ET1 form and grounds of claim before submission
- Advise on realistic compensation ranges, so you can assess any settlement offer properly
Many employment law firms offer a free or fixed-fee initial assessment, and some claims may also be eligible for trade union support or legal expenses insurance through a home or car insurance policy — both worth checking before you assume you can’t afford advice.
Final Thoughts
An unfair dismissal claim is winnable, but success tends to come down to preparation: acting inside the time limit, documenting events clearly, following the right internal process first, knowing what remedy you’re aiming for, and getting the right advice before you file. Getting these five elements right from the start puts you in a far stronger position, whether your case settles early or goes all the way to a tribunal hearing.
This article is general information, not legal advice. For guidance on your specific situation, speak with an employment law solicitor.
Frequently Asked Questions
How long do I have to make an unfair dismissal claim? You generally have three months less one day from your dismissal date to start ACAS Early Conciliation, which pauses the clock while conciliation takes place. This window is due to extend to six months for most claims once new legislation takes effect.
Do I need two years’ service to claim unfair dismissal? For “ordinary” unfair dismissal, you generally need two years’ continuous service, though this is set to reduce to six months for dismissals from 1 January 2027. Automatic unfair dismissal claims, covering reasons like whistleblowing, have no minimum service requirement.
Do I have to go through ACAS before making a claim? Yes, ACAS Early Conciliation is a mandatory step for almost all unfair dismissal claims. You must obtain a certificate before you can submit your ET1 form to the tribunal.
What compensation can I get for unfair dismissal? Compensation typically includes a basic award and a compensatory award for financial losses such as lost earnings. Tribunals can also order reinstatement or re-engagement, though these remedies are less common in practice.
Should I appeal internally before making a tribunal claim? Yes, where your employer has an appeal or grievance process, using it first is generally recommended. Failing to follow a reasonable process can affect any compensation awarded at tribunal.
Can I bring an unfair dismissal claim without a solicitor? Yes, you can submit an ET1 form and represent yourself at tribunal. However, an initial consultation with an employment lawyer can help you assess your case and avoid procedural mistakes before you file.
