For ordinary unfair dismissal, you need at least 2 years' continuous employment with your employer. This is the qualifying period — without it, you generally cannot bring an unfair dismissal claim.
However, for automatically unfair dismissals — such as being sacked because of pregnancy, whistleblowing, trade union activity, or asserting your statutory rights — there is no qualifying period. You are protected from day one.
📖 Employment Rights Act 1996, Part X
UK law recognises 5 potentially fair reasons for dismissal:
Even with a fair reason, the process must be fair: a proper investigation, a disciplinary hearing where you have the right to be accompanied, and the right to appeal. If your employer skips these steps, the dismissal can still be unfair.
📖 ACAS Code of Practice on Disciplinary and Grievance Procedures
Some reasons for dismissal are automatically unfair regardless of your length of service. These include:
If you were dismissed for any of these reasons, you do not need 2 years' service and your claim is likely to be strong.
Constructive dismissal happens when your employer's behaviour is so bad that you're forced to resign. You didn't want to leave — but you had no real choice.
Common examples include persistent bullying or harassment, demotion without your consent, failure to pay wages, unsafe working conditions, or a fundamental change to your job without agreement.
To succeed, you must show your employer committed a fundamental breach of contract — not just something minor or irritating. You should also resign promptly in response to the breach; staying too long can weaken your claim.
If your claim succeeds, the Employment Tribunal can award two types of compensation:
There is a strict process you must follow to bring an unfair dismissal claim:
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General legal information only — not legal advice. For specific situations, contact ACAS or consult a qualified employment solicitor.