How To Dismiss Staff Fairly And Legally In The UK

Dismissing staff is one of those parts of running a small business that no one looks forward to.

But sometimes it’s necessary - whether because performance isn’t improving, conduct has crossed a line, the business is restructuring, or continued employment just isn’t workable.

The key is this: in the UK, dismissing staff isn’t just about reaching the “right” outcome. It’s about relying on a lawful reason, following a fair process, and keeping clear records so you can show you acted reasonably if the decision is challenged later.

This guide walks you through what small business employers need to know about dismissing staff fairly and legally, with practical steps you can actually follow.

When Can You Legally Dismiss Staff In The UK?

In broad terms, dismissing staff is lawful if:

• you have a fair reason for dismissal; and
• you follow a fair process (including a proper investigation where relevant).

Most “fair reasons” fall into five categories under UK employment law (commonly referenced through the Employment Rights Act 1996):

• Conduct (eg misconduct or gross misconduct)
• Capability or performance (eg not meeting required standards, or ill health affecting ability to do the job)
• Redundancy (eg role no longer needed, restructure, workplace closure)
• Statutory illegality (eg the employee can’t legally continue in the role)
• Some other substantial reason (a catch-all category that can apply in specific situations)

Even if you have a fair reason, a dismissal can still be unfair if the process is rushed, inconsistent, or poorly documented.

It’s also important to remember that ordinary unfair dismissal claims usually require the employee to have a minimum qualifying period of service (typically 2 years), although there are key exceptions. Some dismissals can be automatically unfair (for example, dismissing someone for asserting certain statutory rights) and these don’t require the same qualifying service. There are also dismissals that can be discriminatory under the Equality Act 2010, even if you believe you had “good business reasons”. If there’s any possibility that health, pregnancy, disability, religion, age, or another protected characteristic is in the mix, it’s worth slowing down and getting advice before you move.

Before You Start: Check The Basics (Contract, Policies, Evidence)

Before you begin any formal process for dismissing staff, get your foundations straight. This is where small businesses often get caught out - not because they acted maliciously, but because they moved quickly without checking what paperwork they already have (and what it actually says).

1) Review The Employment Contract

Your Employment Contract usually sets out practical rules such as:

• notice periods (including during probation)
• disciplinary and performance procedures (or how they’re incorporated)
• whether you can make a payment in lieu of notice (PILON)
• post-termination restrictions (if any)

If the contract is unclear, inconsistent, or missing key clauses, it doesn’t mean you can’t dismiss - but it does mean you should tread carefully and avoid “improvising” as you go.

2) Check Whether They’re On Probation

Probation isn’t a free pass to dismiss without any process, but it often gives you more flexibility (especially around shorter notice periods) and allows you to address issues early.

If you use probation in your business, it should be clearly written into the contract and applied consistently. Your Probation Periods approach should also include regular check-ins and written feedback - it’s much easier to defend a probation dismissal when you can show the employee had a fair chance to improve.

3) Gather Evidence (And Keep It Organised)

Whether the issue is performance, misconduct, or absence, ask yourself:

• What exactly happened (dates, examples, impact on the business)?
• What evidence supports this (emails, rota records, sales figures, CCTV policy compliance, witness notes)?
• What have we already done to address it (training, warnings, informal chats, support)?

You don’t need “court-level” evidence for every decision, but you do need enough to show you acted reasonably and consistently.

A Fair Process For Dismissing Staff: The Step-By-Step Most Small Businesses Can Follow

A fair process looks slightly different depending on the reason for dismissal, but for most situations you can think in this order:

Step 1: Identify The Issue And The Likely Route (Conduct vs Performance vs Capability)

Start by defining what you’re dealing with:

• Conduct: a behavioural issue (eg rudeness, refusal to follow instructions, dishonesty, harassment).
• Performance: the employee is trying, but not meeting targets/standards (eg poor quality work, missed deadlines).
• Capability (ill health): a health situation impacting their ability to do the role.

This matters because using the wrong process is a common reason dismissals get challenged. For example, treating performance as misconduct (or vice versa) often looks unfair.

Step 2: Investigate Properly (Even If You Think It’s “Obvious”)

For misconduct and many performance issues, you should investigate before making any disciplinary decision. Investigation doesn’t have to be complicated, but it should be real.

That might include:

• speaking to witnesses
• reviewing documents, messages, system logs, CCTV (if you have a lawful basis and policies in place)
• inviting the employee to an investigatory meeting to hear their version of events

If you need to pause the employee’s duties while you investigate, you may consider suspension - but it should be on full pay, for as short a period as possible, and handled carefully. Your approach should align with Employee Suspension best practice, including confirming the suspension in writing and making it clear it is not disciplinary action in itself.

Step 3: Put Concerns In Writing And Invite Them To A Meeting

As a general rule, don’t dismiss “in the moment”. Invite the employee to a meeting in writing. Your letter should clearly set out:

• what the meeting is about (disciplinary/performance/capability)
• the allegations or concerns (with examples)
• possible outcomes (including that dismissal is a possibility, if it is)
• any evidence you will rely on
• their right to be accompanied (where applicable)

This step is often overlooked in small businesses, but it’s one of the simplest ways to make the process feel fair and transparent.

Step 4: Hold The Meeting And Listen With An Open Mind

In the meeting:

• go through the issues and evidence calmly
• give them a chance to respond and explain
• ask questions, and check if there are any mitigating factors
• take notes (and keep them)

You don’t have to agree with the employee - but you do have to genuinely consider what they say. A dismissal can be challenged if it looks like you made your decision before the meeting even happened.

Step 5: Decide On A Proportionate Outcome (Not Everything Needs Dismissal)

Depending on the facts, outcomes might include:

• no further action
• informal coaching / training
• a written warning / final written warning
• a performance plan with review dates
• redeployment (in some capability or redundancy scenarios)
• dismissal (with notice or summary dismissal for gross misconduct)

For performance issues, a structured plan is often the fairest (and safest) way forward. Many employers use Performance Improvement Plans to set measurable goals, support the employee, and create a clear record of what “improvement” looks like.

Step 6: Confirm The Outcome In Writing And Offer A Right Of Appeal

If you do dismiss, confirm it in writing, including:

• the reason for dismissal
• the effective termination date
• notice arrangements (or why dismissal is summary)
• final pay details (holiday, notice pay, deductions if applicable)
• the appeal process and deadline

Offering an appeal isn’t just a “nice to have” - it’s a key part of fairness. Even if you think the outcome won’t change, a proper appeal can fix process issues and reduce legal risk.

If the employee later brings an Employment Tribunal claim, they will usually need to go through Acas Early Conciliation first before the claim can proceed.

Dismissing Staff For Misconduct And Gross Misconduct

Misconduct dismissals usually involve a disciplinary process with escalating warnings, unless the behaviour is serious enough to justify summary dismissal.

What Counts As Gross Misconduct?

Gross misconduct typically means behaviour so serious that it destroys the employment relationship and justifies dismissal without notice (summary dismissal). Common examples include:

• theft or fraud
• violence or threats
• serious harassment or bullying
• serious insubordination
• deliberate breaches of safety rules

Be careful here: calling something “gross misconduct” doesn’t automatically make it gross misconduct. You still need a fair investigation and a reasonable belief, based on evidence.

If you’re navigating this, having a consistent internal checklist helps you avoid missing steps. Many employers lean on a Gross Misconduct process to keep everything structured and properly documented.

Should You Suspend During A Misconduct Investigation?

Sometimes it’s appropriate - for example, where there’s a risk to customers, other staff, evidence integrity, or business operations. But suspension should never be a knee-jerk reaction or used as a punishment.

If you do suspend, do it carefully, confirm it in writing, keep it under review, and pay the employee as usual (unless your contract lawfully allows otherwise, which is uncommon).

Dismissing Staff For Poor Performance Or Capability (Including Ill Health)

In small businesses, poor performance issues often build up over time: missed targets, mistakes, customer complaints, or the rest of the team having to “pick up the slack”.

It’s tempting to jump straight to dismissal - but performance dismissals are one of the most common areas where employers trip up, because fairness usually requires warnings, support, and reasonable time to improve.

A Practical Performance Process

In most cases, a fair performance pathway includes:

• setting clear expectations (what “good” looks like in this role)
• training and support
• a documented improvement plan with review dates
• warnings if there’s no improvement
• a final meeting before dismissal is decided

Again, a structured Performance Improvement Plans approach can be a practical way to show you acted reasonably.

Capability And Ill Health: Avoid Rushing This

Ill health dismissals need extra care because they can overlap with disability discrimination risks under the Equality Act 2010. If the employee’s condition may amount to a disability, you may have a duty to consider reasonable adjustments.

Depending on the situation, a fair process may include:

• medical evidence (eg fit notes, occupational health reports where appropriate)
• consultation meetings with the employee
• considering adjustments (duties, hours, workplace changes)
• considering alternative roles (where available)

For a deeper look at how to manage this pathway, many employers review an Ill Health Capability Dismissal process so they can demonstrate consultation and consideration of alternatives.

Redundancy Dismissals: Extra Steps And Consultation Duties

If the reason for dismissal is redundancy, you’ll usually need to show you have a genuine redundancy situation and you followed a fair redundancy process (including consultation and a fair selection approach where relevant).

Some redundancy situations also trigger collective consultation duties (with employee representatives or a trade union) if you propose 20 or more redundancies at one establishment within 90 days. These cases have additional rules and minimum timescales, so it’s worth getting advice early if you’re planning a larger restructure.

Notice, Final Pay, And The Paperwork That Usually Follows A Dismissal

Once you decide on dismissal, the legal risk often shifts to: “Did we end the employment relationship correctly?”

Notice Periods And PILON

Most employees are entitled to notice (contractual notice and/or statutory minimum notice). If you want the employee to leave immediately, you may be able to make a payment in lieu of notice (PILON). This is cleanest where your contract includes a PILON clause; if it doesn’t, paying in lieu may still happen in practice, but it can create a breach of contract risk (and can have knock-on effects, like post-termination restrictions).

For gross misconduct, you might dismiss without notice - but only if summary dismissal is justified and your process is fair.

Holiday Pay And Other Final Payments

Final pay usually includes:

• wages up to termination date
• accrued but untaken holiday
• notice pay (if applicable)
• any contractual entitlements (commission/bonus, if earned under the contract terms)

Be cautious about deductions. Deductions from wages are tightly regulated, so avoid “offsetting” costs unless you’re confident you have a lawful basis.

Collect Company Property And Manage Access

Have a plan for the practical wrap-up, such as:

• laptops, phones, keys, uniforms
• system access and passwords
• client/customer handover
• confidential information reminders

This is also a good time to check your internal policies around data and monitoring, especially if you’re relying on system logs or device information as evidence. Handling personal data incorrectly can create separate problems under UK GDPR and the Data Protection Act 2018.

Key Takeaways

• Dismissing staff in the UK usually needs both a fair reason and a fair process, backed by clear documentation.
• Start by checking the employment contract, probation terms, relevant policies, and the evidence you have (and what you still need).
• For misconduct (including gross misconduct), run a proper investigation, consider whether suspension is genuinely necessary, and confirm outcomes in writing with an appeal option.
• For poor performance, a structured process with support, warnings, and measurable goals (often through a PIP) is typically the safest and fairest approach.
• For capability and ill health, consult with the employee, consider medical evidence and reasonable adjustments, and avoid rushing decisions that could become discriminatory.
• For redundancy, make sure you consult properly and check whether collective consultation rules apply if you’re proposing 20 or more redundancies within 90 days at one establishment.
• After dismissal, make sure notice, final pay, holiday pay, company property, and documentation are handled correctly to reduce disputes.

If you’d like help with dismissing staff fairly, reviewing your process, or updating your Employment Contract and workplace policies, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.