Fair Dismissal In The UK: What Employers Need To Know

Dismissing someone is one of those “big moment” management tasks that can feel daunting - especially when you’re running a small business and you’re balancing people issues alongside cashflow, customers, and growth.

The good news is that getting to a fair dismissal outcome isn’t about perfect HR jargon or endless paperwork. It’s about having a genuine reason, following a reasonable process, and treating the employee fairly and consistently.

In this guide, we’ll walk you through what “fair dismissal” means in the UK, the common reasons employers rely on, and a practical process you can apply to reduce risk (including the risk of an unfair dismissal claim).

What Does “Fair Dismissal” Mean In UK Employment Law?

In the UK, a dismissal is generally “fair” when:

• You have a fair reason for dismissing the employee; and
• You act reasonably in all the circumstances (including following a fair process).

The key law here is the Employment Rights Act 1996. It recognises five potentially fair reasons for dismissal:

• Conduct (e.g. misconduct or gross misconduct)
• Capability or qualifications (e.g. performance or ill health affecting the ability to do the job)
• Redundancy
• Statutory illegality (continued employment would break the law)
• Some other substantial reason (SOSR) (a genuine business reason not covered above)

Even if you have a potentially fair reason, you can still end up with an unfair dismissal finding if the process is rushed, inconsistent, or not properly documented.

It’s also worth keeping the ACAS Code of Practice on Disciplinary and Grievance Procedures in mind. While a failure to follow the Code doesn’t automatically make a dismissal unfair, Employment Tribunals often consider it when assessing reasonableness - and compensation can be adjusted (up or down) by up to 25% depending on whether the employer or employee unreasonably failed to comply.

Does Unfair Dismissal Protection Apply To All Employees?

Not always. In many cases, an employee needs at least 2 years’ continuous service to bring a standard unfair dismissal claim.

However, there are important exceptions where no qualifying service is needed (often called “automatic unfair dismissal”). These can include dismissals connected with:

• pregnancy, maternity, or family leave rights;
• health and safety activities;
• whistleblowing;
• asserting certain statutory rights (like minimum wage);
• trade union membership/activities.

Separately, you also need to watch discrimination risk. Under the Equality Act 2010, it’s unlawful to discriminate because of protected characteristics (such as disability, sex, race, age, religion, sexual orientation, etc.) - and discrimination claims do not require 2 years’ service.

Why Process Matters (Even In Small Teams)

In a small business, it’s common for performance or conduct issues to be handled informally - especially if you’ve known the person for a while.

But when a dismissal is challenged, the question becomes: can you show you acted fairly? That usually means you need:

• a clear paper trail (even if it’s brief);
• a consistent approach compared with other employees;
• notes of meetings and warnings;
• evidence you investigated and listened to the employee’s side.

This is also why having a solid Employment Contract from day one can make a huge difference - it sets expectations, policies, and procedures upfront, so you’re not trying to invent rules mid-problem.

Common “Fair Reasons” For Dismissal (And How Employers Usually Get Them Wrong)

Let’s break down the most common dismissal scenarios we see in growing businesses, and the traps that can turn a “reasonable decision” into a risky one.

1) Conduct (Misconduct Or Gross Misconduct)

Conduct dismissals typically arise when an employee breaks workplace rules or behaves inappropriately. This might include:

• persistent lateness or absence;
• refusal to follow reasonable instructions;
• bullying or harassment;
• dishonesty, theft, or serious breaches of trust.

If the conduct is serious enough, it may be gross misconduct, which can justify summary dismissal (dismissal without notice). But be careful: calling something “gross misconduct” doesn’t automatically make it so, and a rushed decision is a common reason employers lose disputes.

A practical way to reduce risk is to use a simple checklist approach before taking action for serious misconduct - for example, confirming the allegations, evidence, investigation steps, and the employee’s response. Many employers find it useful to follow a structured process like a Gross Misconduct Checklist when the stakes are high.

2) Capability / Performance

Performance issues are one of the most common reasons small businesses consider dismissal. Typical examples include:

• failure to meet targets;
• poor quality work;
• repeated mistakes;
• lack of required skill for the role.

The biggest mistake employers make here is trying to dismiss for performance without first giving the employee a fair chance to improve.

In many cases, you’ll want a structured improvement plan, clear expectations, and review points. A well-run Performance Improvement Plan (PIP) can be a sensible (and defensible) way to show you acted reasonably and gave support.

3) Capability / Ill Health

Sometimes the issue isn’t skill - it’s health. Long-term sickness absence can put real strain on a small team, but dismissal still needs to be handled carefully.

Key risks here include:

• disability discrimination (where the condition qualifies as a disability under the Equality Act 2010);
• failure to consider reasonable adjustments;
• not obtaining medical evidence or considering alternatives.

If you’re dealing with repeated or long-term absence, it’s worth understanding the usual steps for a lawful capability approach, including medical input and adjustment discussions. This is often covered within an Ill Health Capability Dismissal process.

4) Redundancy

Redundancy is a potentially fair reason where the role is no longer needed - for example, due to:

• a downturn in work;
• a restructure;
• closure of a site;
• outsourcing or automation.

Where employers get caught out is treating redundancy like a performance dismissal (or vice versa), or failing to consult properly. Even in small teams, fair redundancy selection and consultation are important.

In practice, that usually means thinking through things like: the selection pool and criteria (and applying them consistently), meaningful consultation with affected employees, considering suitable alternative roles, and confirming the outcome in writing. Also note that where an employer proposes 20 or more redundancies at one establishment within 90 days, additional collective consultation obligations can apply.

5) Statutory Illegality Or “Right To Work” Issues

Some dismissals happen because continuing employment would be unlawful - for example, if an employee loses the legal right to work in the UK or can no longer hold a required licence for the role.

These situations can still be contentious, so you’ll generally want to document what checks you made and whether any alternative role was considered.

6) SOSR (Some Other Substantial Reason)

SOSR is a broad category, and it’s often used for complex situations like:

• a fundamental breakdown in working relationships;
• pressure from a client (rarely straightforward);
• a reorganisation that doesn’t meet the legal definition of redundancy;
• refusal to accept important contractual changes (handled carefully).

SOSR dismissals can be fair, but they’re often higher risk because the “substantial reason” and the process need to be particularly well thought through.

A Step-By-Step Fair Dismissal Process Employers Can Follow

If you want to reduce risk, it helps to approach dismissal as a repeatable process. You don’t need a huge HR department - you need consistency and basic documentation.

Step 1: Confirm The Real Reason (And Don’t Mix Reasons)

Start by being honest (internally) about why dismissal is on the table. Ask:

• Is this really performance, or is it conduct?
• Is this actually redundancy, or are we unhappy with the individual?
• Is there any health/disability issue in the background?

Mixing reasons is one of the fastest ways to undermine a fair dismissal, because it makes your decision look pre-determined or inconsistent.

Step 2: Investigate The Facts Properly

For conduct dismissals, an investigation is usually essential. For performance/capability dismissals, your “investigation” may be reviewing metrics, work quality, training records, and supervision notes.

Practical investigation steps might include:

• collecting documents (emails, timesheets, reports);
• taking witness statements where relevant;
• checking what policies/contract terms apply;
• confirming what’s happened previously (informal warnings, coaching, etc.).

If the allegation is serious, you might consider suspension while you investigate. Suspension should not be treated as a punishment - it should be a neutral step to protect the investigation and the business. If you’re unsure what’s reasonable, it can help to check typical guidance around Suspension Pending Investigation.

Step 3: Invite The Employee To A Meeting (And Share Key Information)

A fair process typically includes a meeting where you:

• explain the concerns clearly;
• give the employee a chance to respond;
• ask questions and clarify facts;
• consider any mitigation (context, training gaps, personal circumstances).

As a practical point, give reasonable notice of the meeting and share enough detail so the employee can respond meaningfully.

Step 4: Use Warnings And Improvement Steps Where Appropriate

In many cases, fairness means using a staged approach (particularly for performance and non-gross misconduct), such as:

• informal chat and coaching;
• first written warning;
• final written warning;
• dismissal (if no improvement).

For many employers, aligning your disciplinary steps with the ACAS Code (for example, setting out the issue in writing, holding a meeting, allowing representation where appropriate, and offering an appeal) helps demonstrate that you acted reasonably.

Can you dismiss without any warning? Sometimes, yes - but it’s usually limited to serious misconduct, or where warnings wouldn’t be reasonable in the circumstances. If you’re weighing this up, it’s worth sense-checking the risk factors in Dismissal Without Warning.

Step 5: Make A Reasoned Decision And Document It

When you decide, keep it simple but clear. Document:

• the reason for dismissal (conduct/capability/redundancy etc.);
• the key evidence relied on;
• the process followed (meetings, warnings, support offered);
• why dismissal is considered reasonable at this stage;
• notice arrangements (or summary dismissal reasons);
• any pay owed (holiday pay, notice pay, outstanding wages).

You should usually confirm the dismissal in writing. Many employers also include the right of appeal in the dismissal outcome letter.

Step 6: Offer An Appeal

An appeal is a key “fairness” safeguard. It shows you’re open to reconsidering if new information comes to light or if process errors occurred.

Where possible, the appeal should be handled by someone not involved in the initial decision (even if that’s an external HR consultant or a different manager in a small business).

Risk Hotspots That Can Turn A Fair Dismissal Into A Costly Dispute

Even well-intentioned employers can slip up. Here are common hotspots to watch for if you want to keep your dismissal defensible.

Inconsistent Treatment Between Employees

If one employee is dismissed for an issue that others have “got away with”, that inconsistency can undermine fairness. It doesn’t mean every case must have the same outcome - but you should be able to explain why you treated the cases differently.

Skipping Adjustments For Disabled Employees

If there’s any chance the employee’s health condition could amount to a disability, you should slow down and consider:

• whether reasonable adjustments could help them do the job;
• whether absence management steps are fair;
• whether medical evidence is needed.

This is one area where getting tailored advice early can save a lot of stress later.

Letting A Process Drag On Too Long

Fairness cuts both ways. A process that drags on for months without clear steps can become unreasonable - and it’s also tough on morale.

Set timelines, communicate them, and follow through.

Settlement Conversations Without A Plan

Sometimes, a business decision is to negotiate an exit. That can be a valid approach - but it should be done carefully, particularly around what’s said, what’s put in writing, and how it’s positioned.

In the UK, not every “off the record” conversation is protected. Depending on the circumstances, you may be relying on without prejudice rules (which generally require a genuine dispute) and/or the statutory protected conversation framework (which can apply to certain settlement discussions, but has important limits - for example, it won’t protect improper behaviour, and it doesn’t prevent claims like discrimination or whistleblowing). If you’re considering a settlement route, it’s worth getting legal support so you don’t accidentally increase risk while trying to reduce it.

How To Protect Your Business “From Day One” (So Dismissal Isn’t Your First HR System)

The smoothest dismissals are usually the ones where the business had clear foundations before the problems began.

Practical steps you can take early include:

• Put clear contracts in place so expectations, notice, probation, and key policies are set out properly (this is where a tailored Employment Contract helps).
• Train managers on how to document performance, run meetings, and keep communication professional.
• Create a repeatable performance process so you’re not improvising under pressure (for many employers, that means having a workable Performance Improvement Plan (PIP) approach).
• Keep basic records (notes of key conversations, warnings, targets set, training offered).
• Use fair investigation steps when allegations arise, and understand when neutral suspension may be appropriate (including expectations around Suspension Pending Investigation).

If you’re building a team, think of this as the legal equivalent of good bookkeeping: a small amount of consistent effort upfront can prevent major pain later.

Key Takeaways

• Fair dismissal usually requires both a potentially fair reason (conduct, capability, redundancy, illegality, SOSR) and a reasonable process (often assessed with the ACAS Code in mind).
• Even if an employee can’t claim standard unfair dismissal (often due to the 2-year service rule), you still need to watch for automatic unfair dismissal and discrimination risks.
• For conduct issues, carry out a proper investigation and consider structured steps like a Gross Misconduct Checklist when allegations are serious.
• For performance issues, giving a fair opportunity to improve (often via a Performance Improvement Plan (PIP)) is one of the strongest ways to show reasonableness.
• Long-term sickness and ill health capability dismissals require extra care, including consideration of adjustments and medical evidence - an Ill Health Capability Dismissal approach can help keep the process structured.
• Redundancy dismissals should include a fair selection approach, meaningful consultation, and consideration of suitable alternative roles - and collective consultation rules may apply in larger redundancy exercises.
• Having solid legal foundations, including a tailored Employment Contract, makes fair dismissal decisions much easier to manage (and defend) as your business grows.

If you’d like help managing dismissal risk, updating your employment documents, or setting up a fair process that fits your business, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.