Unfair Dismissal: A Complete Guide for UK Employees and Employers

Losing a job is stressful enough without having to wonder whether your employer followed the law. In the UK, unfair dismissal is one of the most common employment tribunal claims, and it exists to protect employees from being sacked without a fair reason or a fair process. Whether you are an employee who has just been dismissed, or an employer preparing to dismiss someone, it is worth understanding exactly where the legal line is drawn.

This guide explains what counts as unfair dismissal under the Employment Rights Act 1996, the five reasons that can potentially make a dismissal fair, the qualifying service rules, what a fair dismissal procedure looks like, and how unfair dismissal claims and compensation work. It is written for both sides of the employment relationship, because getting a dismissal right matters to everyone involved.

What Counts as Unfair Dismissal in the UK

A dismissal happens when the employer ends the employment contract, when a fixed-term contract expires without renewal, or when the employee resigns in response to the employer’s serious breach of contract (known as constructive dismissal). In each case, the employee may be able to argue that the dismissal was unfair.

Under section 98 of the Employment Rights Act 1996, an unfair dismissal claim starts from a simple premise: the dismissal is treated as unfair unless the employer can show a potentially fair reason for it and that it acted reasonably in treating that reason as sufficient to dismiss. The tribunal looks at both the reason and the way the employer handled the process, judging the employer’s actions against the standard of a reasonable employer in the same circumstances.

The Five Potentially Fair Reasons for Dismissal

An employer defending an unfair dismissal claim must first point to one of five potentially fair reasons set out in the legislation. These are the only reasons that can ever justify a dismissal:

1. Capability

Capability covers an employee’s skill, aptitude, health or qualifications to do the job. Poor performance and long-term sickness absence both fall under this heading. Before dismissing for capability, an employer is expected to warn the employee, give them a genuine chance to improve, offer support or training where appropriate, and consider alternatives such as redeployment.

2. Conduct

Conduct dismissals relate to misconduct, from persistent lateness to gross misconduct such as theft or violence. The employer must carry out a reasonable investigation, put the allegations to the employee, hold a disciplinary hearing and allow an appeal. Dismissal for a first offence is usually only fair where the misconduct is genuinely serious.

3. Redundancy

Redundancy is a fair reason only where there is a genuine redundancy situation, such as the closure of a workplace or a reduced need for employees to do particular work. The employer must also consult, use a fair selection process, and look for suitable alternative employment before dismissing.

4. Illegality: Contravention of a Statutory Duty

Sometimes called the “statutory illegality” reason, this applies where keeping the employee on would break the law. A common example is a delivery driver who loses their driving licence, or a worker who no longer has the right to work in the UK. The employer must still act reasonably and check whether any alternative role is available.

5. Some Other Substantial Reason (SOSR)

SOSR is a catch-all for substantial reasons that do not fit the other four categories, such as a serious breakdown in the working relationship, a business reorganisation, or a personality clash that makes continued employment untenable. Tribunals scrutinise SOSR dismissals carefully, so employers need clear evidence that the reason was genuinely substantial.

Having one of these reasons is only the starting point. A dismissal for a fair reason can still be an unfair dismissal if the employer handled it unreasonably, which is why procedure matters so much.

Qualifying Service: Who Can Bring an Unfair Dismissal Claim

Most employees need at least two years’ continuous employment with the same employer before they can bring an ordinary unfair dismissal claim. Continuous employment is measured from the first day of work, and certain short breaks between contracts may still count towards the total.

The right not to be unfairly dismissed belongs to employees, not to the genuinely self-employed. If you work as an independent contractor running your own business, you cannot bring an unfair dismissal claim, however long you have worked for a client. The position of agency workers and others in the middle ground depends on the precise facts, which is one reason these cases often turn on employment status. Our overview of employment rights in the UK explains the difference between employees, workers and the self-employed in more detail.

There are important exceptions to the two-year rule. Some dismissals are automatically unfair, meaning no qualifying service is needed at all.

Automatically Unfair Dismissal: No Qualifying Service Needed

An automatic unfair dismissal occurs where the real reason for the dismissal is one the law specifically protects against. In these cases the dismissal is automatically unfair, even if the employee started work the previous week, and the tribunal does not need to consider whether the employer acted reasonably.

Common examples of automatically unfair dismissal include dismissal because of pregnancy or maternity leave, making a protected disclosure (whistleblowing), trade union membership or activities, asserting a statutory employment right such as the right to the national minimum wage, taking action over health and safety, or jury service. Because the stakes are so high, employers should treat any dismissal connected to these areas with extreme care.

A Fair Dismissal Needs a Fair Procedure

Even where the reason for dismissal is sound, cutting corners on procedure can turn a fair dismissal into an unfair dismissal. Employers are expected to follow the Acas Code of Practice on disciplinary and grievance procedures, which sets out the minimum standards for handling misconduct and capability cases.

In practice, a fair procedure usually means investigating the facts, writing to the employee with the allegations and evidence, holding a meeting at which the employee can respond and be accompanied by a colleague or trade union representative, deciding on the outcome, and offering a right of appeal. Skipping steps, pre-judging the outcome or treating similar cases inconsistently are classic routes to losing an unfair dismissal claim.

Where an employer unreasonably fails to follow the Acas Code, the tribunal can increase any compensation by up to 25%. Conversely, where the employee unreasonably fails to follow it, compensation can be reduced by the same amount.

Bringing Unfair Dismissal Claims: Time Limits and Tribunals

Unfair dismissal claims are brought in the employment tribunal, and the time limits are strict. In most cases you must contact Acas for Early Conciliation within three months less one day of the effective date of termination. Early Conciliation pauses the clock while Acas tries to help both sides reach agreement, and you need an Acas certificate before the tribunal will accept your claim.

Missing the deadline usually means losing the right to claim altogether, so anyone considering unfair dismissal claims should act quickly and take advice early. Many disputes are resolved through a settlement agreement during or after conciliation, which can give both sides certainty without a full hearing.

Compensation for Unfair Dismissal

If an unfair dismissal claim succeeds, the tribunal can award compensation made up of two parts. The basic award is calculated using the employee’s age, length of service and a week’s pay, with the weekly amount subject to a statutory cap that is updated each year. The compensatory award covers financial losses flowing from the dismissal, such as lost earnings and benefits, and is also subject to a statutory maximum.

Tribunals expect dismissed employees to mitigate their loss by looking for new work, and compensation can be reduced where the employee contributed to their own dismissal or where the tribunal concludes the dismissal would have happened anyway even with a fair procedure. It is worth noting that compensation for unfair dismissal is a statutory award, which is different from damages for breach of contract — the two claims follow different rules and different limits.

Unfair Dismissal vs Breach of Employment Contract

People often use these terms interchangeably, but they describe different legal claims. Unfair dismissal is a statutory claim about whether the employer had a fair reason and followed a fair process. A breach of employment contract, sometimes called wrongful dismissal when it involves dismissal without proper notice, is a contractual claim about whether the employer broke the terms of the contract itself.

The distinction matters: an employee can be dismissed in breach of contract but fairly for unfair dismissal purposes, or vice versa. The two claims can sometimes be brought together, but they are assessed under different legal tests and can lead to different remedies.

Practical Steps for Employers

Employers who want to avoid unfair dismissal claims should treat every dismissal as a process, not an event. Put clear disciplinary, capability and redundancy policies in place and follow them consistently. Investigate before deciding, keep written records of each stage, and give employees a genuine chance to respond before any decision is made.

Take particular care with employees who may have less than two years’ service, because an automatically unfair dismissal claim has no qualifying period. Train managers in the basics of the Acas Code, apply the same standards to everyone, and seek advice before dismissing in complex or sensitive cases. A short delay to get the process right is always cheaper than defending a tribunal claim.

When to Speak to an Unfair Dismissal Solicitor

Whether you are facing dismissal or carrying one out, early legal advice can make a decisive difference. An experienced employment contract lawyer can assess the strength of an unfair dismissal claim, advise on procedure and settlement, and represent you at the employment tribunal if needed. For employees, many unfair dismissal solicitors offer an initial assessment of whether the dismissal was fair and what the claim might be worth. For employers, advice at the planning stage is the most cost-effective protection against claims.

Key Takeaways

• A dismissal is unfair unless the employer shows a potentially fair reason and acted reasonably.
• The five potentially fair reasons are capability, conduct, redundancy, illegality and some other substantial reason.
• Most employees need two years’ continuous service to claim, but automatically unfair dismissals need no qualifying period.
• A fair reason is not enough: employers must follow a fair procedure in line with the Acas Code.
• Claims must go through Acas Early Conciliation within three months less one day of dismissal.
• Successful claims can lead to a basic award and a compensatory award, both subject to statutory caps.

Unfair dismissal law aims to strike a balance: employers must be able to manage their workforce, but employees deserve protection from arbitrary or badly handled dismissals. Understanding the rules helps both sides resolve problems early and, where dismissal is unavoidable, handle it in a way that is fair, lawful and defensible.