Losing a job feels unfair long before it’s legally “unfair dismissal.” The two aren’t the same thing. Employment law in Great Britain sets out specific reasons an employer can rely on, a process they’re expected to follow, and strict time limits for challenging a dismissal at an employment tribunal — and missing any of these can matter as much as the decision itself.
What counts as a fair reason for dismissal
Acas guidance sets out that a dismissal is only potentially fair if the employer can point to one of a limited set of reasons, most commonly conduct (the employee did something inappropriate or unacceptable) or capability (the employee isn’t able to do the job, or lacks the right qualifications). Redundancy, a legal restriction that stops someone doing the job, and “some other substantial reason” are the other recognised categories. Having a fair reason isn’t the end of it, though — the employer also has to act reasonably in how they handle the dismissal, which is where a lot of claims are actually won or lost: was there a proper investigation, a real hearing, and a chance to appeal?
The two-year qualifying period — and its exceptions
For most employees, the right to claim ordinary unfair dismissal only kicks in after two years of continuous employment with the same employer. Fall short of that, even by a few weeks, and there’s generally no ordinary unfair dismissal claim available, regardless of how badly the dismissal was handled. There’s an important carve-out, though: Acas guidance confirms that no qualifying period is needed at all where the reason for dismissal is “automatically unfair” — for example pregnancy or maternity leave, trade union membership, whistleblowing, jury service, requesting family leave, or raising a genuine health and safety concern. In those cases, an employee is protected from day one of the job. It’s also worth knowing this qualifying period is due to change: government guidance confirms unfair dismissal protection is set to become a right from day one for dismissals from a job started on or after a date planned for 2027, rather than after two years, though the two-year rule is what applies to claims now.
ACAS early conciliation comes before the tribunal, not instead of it
You cannot generally go straight to an employment tribunal. GOV.UK guidance is explicit that before making a claim, you must first notify Acas, which offers early conciliation — a chance to resolve the dispute without a tribunal hearing at all. If conciliation doesn’t resolve things, Acas issues a certificate, and that certificate number is needed to actually submit the tribunal claim (form ET1). Going through Acas isn’t a formality to skip; a tribunal claim submitted without it can be rejected.
Time limits: why “3 months” is really less than that
GOV.UK guidance states that a claim usually has to be made within three months of the employment ending or the problem happening, but the clock doesn’t simply pause for however long conciliation takes and then restart fresh — contacting Acas stops the clock while conciliation is ongoing, and Acas guidance elsewhere describes the underlying tribunal deadline as three months minus one day from the dismissal or detriment. In practice this means the safest approach is to contact Acas well before the three-month mark, not close to it, because working out exactly how much time is left after conciliation pauses and resumes the clock is genuinely easy to get wrong. Tribunals have limited discretion to accept a late claim, but it isn’t guaranteed and shouldn’t be relied on.
What a tribunal can actually award
If a claim succeeds, a tribunal can order reinstatement or re-engagement, though this is relatively rare in practice, or more commonly a compensatory award alongside a basic award calculated in a similar way to statutory redundancy pay (based on age, length of service and weekly pay, subject to statutory caps). The compensatory element is meant to reflect the claimant’s actual financial loss, including notice pay and lost earnings, though it is itself subject to a statutory cap that is uprated periodically.
FAQs
What’s the difference between unfair dismissal and wrongful dismissal?
Wrongful dismissal is a breach-of-contract claim, usually about notice pay or a fixed term ended early, and doesn’t require two years’ service. Unfair dismissal is about whether the reason and process behind the dismissal were fair under employment law, and generally does require two years’ service unless an automatically unfair reason applies.
Do I need a solicitor to bring a claim?
No — employment tribunal claims are designed to be brought without a lawyer, and many people do. Acas early conciliation itself is free. That said, for anything beyond a straightforward case, early advice can help you understand whether you have a viable claim before the time limit runs out.
Can I still claim if I resigned rather than being dismissed?
Potentially, through a constructive dismissal claim, if you resigned in response to a fundamental breach of contract by your employer. The same two-year qualifying period and time limits generally apply, and constructive dismissal claims are often harder to prove than a straightforward dismissal.
Bottom line
Whether a dismissal is actually unfair depends on the employer’s reason and how reasonably they acted, not just how it feels. Check your length of service against the two-year rule and the automatically-unfair exceptions, contact Acas well inside the three-month window, and treat early conciliation as a genuine first step rather than a box to tick before the real process starts.