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Employment Law

Unfair Dismissal in the UK: A Practical Employer Checklist

AirCounsel Team
08/12/2025
18 min read
Unfair Dismissal in the UK: A Practical Employer Checklist

In 2022/23, more than 80,000 employment tribunal claims were accepted in Great Britain, with unfair dismissal featuring heavily among them.[1]

For UK employers, unfair dismissal risk is no longer a rare “HR problem” — it’s a predictable business risk that affects cash flow, leadership time, and reputation.

This guide gives you a practical, step‑by‑step unfair dismissal checklist under current UK law, so you can plan exits confidently, adapt to evolving Employment Rights Bill reforms, and know exactly when to pause and get legal support before you let someone go.

Table of Contents

Quick Summary

TakeawayExplanation
Unfair dismissal = fair reason + fair processUnder the Employment Rights Act 1996, dismissals must be for a potentially fair reason and follow a reasonable procedure. Failing either limb can make the dismissal unfair.
2-year qualifying period has key exceptionsMost employees need 2 years’ service to claim ordinary unfair dismissal, but “automatically unfair” reasons (e.g., whistleblowing, pregnancy) and discrimination claims have no minimum service.
ACAS-style procedure is expectedTribunals expect employers to follow the Acas dismissal guidelines: investigate, warn, hold a meeting, allow representation, and offer an appeal.
High‑risk scenarios need extra careRedundancies, probation dismissals close to 2 years, sickness dismissals, and alleged gross misconduct often combine unfair dismissal and discrimination risks.
Tribunal claims are costly beyond the awardAside from compensation, you face legal fees, management distraction, potential reputational damage, and pressure to settle.
Early legal input saves moneyA short, fixed‑fee review before dismissal or during negotiations is usually cheaper than defending an unfair dismissal claim later.

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What Is Unfair Dismissal Under UK Law?

Unfair dismissal is a statutory claim created by the Employment Rights Act 1996 (ERA 1996).

In simple terms, a dismissal is unfair if:

  • You do not have a fair reason, or
  • You do not follow a fair procedure, or
  • Both.

Who Is Protected and When

Most employees gain the right not to be unfairly dismissed after a qualifying period of 2 years’ continuous service with you.

Key points:

  • The right applies to employees, not genuine self‑employed contractors.
  • Breaks in service, TUPE transfers, and group restructures can affect continuity.
  • Even if they lack 2 years’ service, a worker may still claim:
    • Wrongful dismissal (e.g., not paid notice).
    • Discrimination.
    • Automatically unfair dismissal.

Ordinary vs Automatically Unfair Dismissal

There are 2 broad categories:

  • Ordinary unfair dismissal

    • Employee usually needs 2 years’ service.
    • Tribunal decides if you had a fair reason and acted reasonably.

  • Automatically unfair dismissal

    • No qualifying period is needed.
    • Dismissal is automatically unfair if the principal reason is, for example:
      • Whistleblowing.
      • Pregnancy, childbirth, or maternity.
      • Health and safety activities.
      • Trade union membership or activities.
      • Asserting certain statutory rights (e.g., working time, minimum wage).

On top of this, if the dismissal is linked to a protected characteristic (e.g., disability, sex, race, age, religion), the employee may also have a discrimination claim under the Equality Act 2010, with uncapped compensation.

How Employment Rights Bill Reforms Fit In

At the time of writing, proposed Employment Rights Bill reforms focus on strengthening “day 1” protections (for example, around predictable contracts or flexible working) rather than tearing up the unfair dismissal framework.

For employers, this means:

  • The core test of unfair dismissal (fair reason + fair process) from ERA 1996 still applies.
  • More day‑1 rights increase the risk that a dismissal of a short‑service employee is linked to:
    • A flexible working request.
    • Working patterns.
    • Other statutory rights.

In practice: treat all dismissals as if they could be challenged later, regardless of length of service.

Fair Reasons for Dismissal (And How They Map to Real Life)

ERA 1996 sets out 5 potentially fair reasons for dismissal. You must be able to point to one of them.

Capability or Performance

Capability covers:

  • Skill and performance.
  • Health and long‑term sickness.
  • Qualifications needed for the role.

Real‑world examples:

  • Consistently failing sales targets despite support and warnings.
  • A role materially changing, and the employee lacks the skills after reasonable training.
  • Long‑term sickness where reasonable adjustments and alternatives have been explored but there is still no realistic prospect of a return.

Risks:

  • Capability dismissals often overlap with disability discrimination.
  • Employers must show they explored adjustments, alternative roles, and fair performance management.

Conduct or Misconduct

Conduct refers to behavior, from minor misconduct to gross misconduct.

Examples:

  • Repeated lateness despite warnings.
  • Breach of IT or social media policies.
  • Gross misconduct such as theft, violence, or serious harassment.

Key points:

  • Even for apparent gross misconduct, you are expected to investigate and hold a hearing before dismissal.
  • Instant summary dismissal without any process is often found unfair, even where misconduct is proven.

Redundancy

Redundancy is a fair reason if:

  • You genuinely no longer need the role, or
  • You need fewer people to do the work, or
  • The business/office closes.

Typical scenarios:

  • Tech automation reduces headcount needs.
  • Site closure or moving operations to another location.
  • Strategic reorganisation removing a whole function.

Tribunals look at:

  • Genuine business rationale.
  • Fair selection criteria and scoring.
  • Consultation process (individual and, where required, collective).

Statutory Restriction

This applies where keeping the person employed would break the law, for example:

  • A driver losing their driving license permanently.
  • A migrant worker without the required right to work.

You still need to show you explored alternatives (e.g., other roles not requiring that license).

Some Other Substantial Reason (SOSR)

A “catch‑all” category, used carefully, such as:

  • Irreconcilable personality clash damaging the business.
  • Reputational risks (e.g., senior employee charged with an offence).
  • Business reorganisation involving changes to terms and conditions where the employee will not agree.

Tribunals expect robust evidence and a fair process, not vague complaints about “fit” or “attitude”.

Step-By-Step Checklist Before You Dismiss

Use this as a practical unfair dismissal checklist to pressure‑test your decision and process.

Step 1: Clarify the Real Reason and Risks

  • Identify the main reason: capability, conduct, redundancy, statutory restriction, or SOSR.
  • Ask yourself:
    • Is there any chance the reason is actually linked to a protected characteristic or whistleblowing?
    • Could it be seen as retaliation for a complaint, flexible working request, or health and safety issue?

If you struggle to describe the reason clearly in a sentence, that is a warning sign that you need advice.

Step 2: Check Service, Status, and Protected Rights

  • Confirm if the individual is:
    • An employee, worker, or contractor.
    • Within their probationary period.
    • At or near 2 years’ service.
  • Identify any automatic or discrimination risks:
    • Pregnancy/maternity or family leave.
    • Recent whistleblowing.
    • Health conditions possibly amounting to disability.
    • Trade union involvement.

Even where ordinary unfair dismissal does not apply, you must avoid automatically unfair reasons and discrimination.

Step 3: Investigate and Gather Evidence

  • Follow Acas-style guidance on dismissals, which stresses investigation before action.[2]
  • Steps typically include:
    • Appointing an investigator (ideally not the decision‑maker).
    • Taking witness statements where relevant.
    • Collecting documents: emails, attendance records, performance data.
    • Giving the employee a chance to explain at an investigatory meeting.

Your investigation does not need to be perfect, but it must be reasonable in the circumstances.

Step 4: Consult, Warn, and Give a Chance to Improve

Except for the clearest gross misconduct cases, tribunals expect:

  • Clear communication of concerns or redundancies.
  • Warnings (verbal, then written) for performance or misconduct.
  • Adequate time and support for improvement (e.g., a Performance Improvement Plan).
  • For redundancy:
    • Fair pool selection.
    • Objective criteria.
    • Meaningful consultation and consideration of alternatives.

Do not surprise employees with dismissal out of nowhere – it is a classic unfair dismissal mistake.

Step 5: Decide, Communicate, and Confirm in Writing

  • Have a structured decision meeting:
    • Summarise evidence.
    • Consider the employee’s explanations and mitigation.
    • Consider alternatives to dismissal (final warning, transfer, further support).
  • Take a short adjournment before deciding.
  • Confirm the decision in a dismissal letter that explains:
    • The reason for dismissal.
    • The effective date of termination.
    • Notice arrangements and payments.
    • Any outstanding holiday pay or bonuses.
    • The right of appeal.

Step 6: Offer an Appeal and Consider Settlement

  • Offer a right of appeal and explain how to exercise it and by when.
  • Use the appeal to check:
    • Whether process mistakes can be corrected.
    • Whether any new evidence changes the outcome.

At any stage, you can explore a confidential, without‑prejudice settlement, typically documented in a settlement agreement. For key exits, consider using AirCounsel’s Custom Employee Settlement Agreement service to lock in a clean break and a waiver of claims.

Checklist Snapshot: Have You Covered the Basics?

StepKey QuestionEvidence You Should Have
ReasonCan you clearly state a potentially fair reason rooted in ERA 1996?Internal note summarising capability, conduct, redundancy, statutory restriction, or SOSR basis.
RiskHave you checked for automatic or discrimination risks?HR file, notes on protected acts/characteristics, legal risk assessment.
ProcessHave you investigated, consulted, and followed your own policy?Investigation report, invite letters, meeting notes, performance records.
DecisionCan you show that dismissal was within a “band of reasonable responses”?Decision note weighing evidence, reasons for not choosing lesser sanctions.
AppealHave you offered and handled an appeal fairly?Appeal invite, grounds of appeal, appeal outcome letter.

High-Risk Dismissal Scenarios for Employers

Some situations are much more likely to trigger unfair dismissal and discrimination claims.

Probation and Short-Service Dismissals

“I’ll just dismiss before 2 years’ service so they can’t claim” is dangerous thinking.

Risks:

  • Automatically unfair dismissal (e.g., they raised health and safety concerns).
  • Discrimination (no qualifying period).
  • Reputational issues if reasons are poorly documented.

Best practice:

  • Still follow a scaled‑down fair process: meeting, reasons, opportunity to respond, short written outcome.
  • Avoid dismissing soon after a protected act (complaint, flexible working request, whistleblowing) without clear non‑retaliatory evidence.

Redundancy and Reorganisation

Common problems:

  • Using “redundancy” to disguise a performance or conduct issue.
  • Creating a selection pool that captures only one person.
  • Subjective selection criteria (e.g., “attitude”, “fit”) without evidence.

To minimize risk:

  • Follow Acas guidance on how to handle redundancies.[3]
  • Use objective scoring (e.g., qualifications, performance data, attendance).
  • Keep clear notes of consultation discussions and alternative roles considered.

Long-Term Sickness and Disability

Capability dismissals related to ill health are high‑risk because they overlap with disability discrimination.

Key steps:

  • Obtain up‑to‑date medical evidence (with consent).
  • Consider and document reasonable adjustments.
  • Explore alternative roles or reduced hours.
  • Only move toward dismissal after a fair capability process and consultation.

Alleged Misconduct and Gross Misconduct

Common pitfalls:

  • Treating “suspicion” as proof.
  • Skipping the investigation and hearing because it “obviously” happened.
  • Failing to give the employee all evidence in advance of the hearing.

To stay on safer ground:

  • Suspend only where necessary and on full pay (unless the contract allows otherwise).
  • Investigate, then hold a disciplinary hearing with the right to be accompanied.
  • Use consistent sanctions across comparable cases.

Tribunal Risk, Costs, and Timelines

Time Limits and Process

Most unfair dismissal claims must be started within 3 months less 1 day from the effective date of termination.

High-level process:

  • The employee contacts Acas for Early Conciliation.
  • If not settled, they can bring a claim in the Employment Tribunal.
  • You file a response, then both sides exchange documents and witness statements.
  • There may be a preliminary hearing, then a full hearing where witnesses give evidence.

Even where you win, you will spend management time, legal costs, and potentially weeks dealing with the claim.

Types of Awards and Current Caps

For straightforward unfair dismissal (not discrimination or whistleblowing), tribunals can award:

  • A basic award – calculated broadly like a statutory redundancy payment, based on age, length of service, and a capped weekly pay rate.
  • A compensatory award – intended to cover actual financial loss (lost earnings, benefits), subject to a statutory cap (the lower of a set maximum or 1 year’s gross pay).

Caps and weekly pay limits are reviewed annually; you should check the latest UK government guidance on unfair dismissal compensation for current figures.[4]

On top of this:

  • If the dismissal is discriminatory or linked to whistleblowing, compensation can be uncapped and include injury to feelings.
  • Awards can be increased or reduced by up to 25% if either party unreasonably fails to follow the Acas Code of Practice on Disciplinary and Grievance Procedures.

Documentation: How to Protect Your Position

Well‑drafted documents and consistent records are often the difference between winning and losing at tribunal.

Documents You Should Have in Place

  • Employment contracts with:
    • Clear roles and duties.
    • Notice periods and probation terms.
    • Disciplinary and capability references.
  • Employee handbook / policies covering:
    • Disciplinary and grievance procedures.
    • Performance management.
    • Sickness absence and capability.
    • Equal opportunities and anti‑harassment.
  • Redundancy and restructuring frameworks for times of change.

If your contracts or policies are outdated or templated from the internet, consider using AirCounsel’s Custom Employment Agreement service to align your documentation with current UK law and your actual practices.

What to Record During a Dismissal

For any dismissal, keep:

  • Investigation notes and witness statements.
  • Copies of invite letters and outcome letters.
  • Emails and documents relied on for performance or redundancy scoring.
  • Notes of all meetings, signed or agreed by attendees where possible.
  • A brief decision record explaining why dismissal was chosen over lesser sanctions.

These records allow you and your lawyers to reconstruct events quickly if a claim later arrives.

You should seriously consider fixed‑fee legal input when:

  • Planning a restructure or redundancy that affects more than one person.
  • Dismissing anyone:
    • At or near 2 years’ service.
    • Who is pregnant, on family leave, or recently returned.
    • With long‑term sickness or a potential disability.
    • Who has complained about discrimination, pay, safety, or blown the whistle.
  • Offering or negotiating an exit package or settlement agreement.
  • Receiving an Acas Early Conciliation notification or tribunal claim.

AirCounsel can:

Get Calm, Fixed-Fee Help With Unfair Dismissal Decisions

Employer discussing a dismissal strategy with a UK employment solicitor via video call

A dismissal that feels like “a quick fix” today can become a 12‑month tribunal headache if the reason or process is not robust. A short, structured review with an employment solicitor often costs less than one month’s salary for the individual you are letting go.

With AirCounsel, you get:

  • Fast, clear risk‑mapping of your proposed dismissal, process, and documents.
  • Transparent, fixed pricing – no meter running in the background.
  • Practical options: adjust your process, agree an exit, or defend with confidence.

If you are planning a dismissal or restructure, book:

Frequently Asked Questions

What is considered an unfair dismissal for UK employers?

A dismissal is likely to be unfair if you cannot show both a potentially fair reason (such as conduct, capability, or redundancy) and a reasonable procedure (investigation, meeting, chance to respond, and appeal). Automatically unfair reasons, like dismissing someone for whistleblowing or pregnancy, are unlawful regardless of process.

How long must an employee work before they can claim unfair dismissal, and what are the main exceptions?

Most employees need 2 years’ continuous service to claim ordinary unfair dismissal. However, there is no qualifying period if the main reason for dismissal is automatically unfair (e.g., whistleblowing, health and safety activities, asserting statutory rights) or if the employee brings a discrimination claim related to a protected characteristic.

What process should an employer follow before dismissing someone for misconduct or poor performance?

You are expected to follow an Acas‑style procedure: investigate, set out allegations in writing, hold a disciplinary or capability hearing, allow the employee to be accompanied, consider their response, decide on an appropriate sanction, confirm it in writing, and offer an appeal. For performance, you should usually warn and give a reasonable chance to improve before dismissing.

How much can an unfair dismissal claim cost an employer in compensation and management time?

Financially, tribunals can award a basic award plus a compensatory award (up to a statutory cap for ordinary unfair dismissal), and discrimination or whistleblowing cases can be uncapped. In practice, the bigger cost is often management time spent on evidence gathering, hearings, and negotiations, plus disruption to morale and the pressure to settle early.

Can I safely dismiss someone during probation without a full process?

Probationary periods do not override statutory rights. You have more flexibility with short‑service employees, but you must still avoid automatically unfair reasons and discrimination, and you should follow a scaled‑down fair process (meeting, reasons, chance to respond, short written confirmation). Abrupt, undocumented probation dismissals are vulnerable if the employee later alleges a protected reason.

Do I always need a settlement agreement when someone leaves?

No. A straightforward, low‑risk dismissal with proper notice can be handled without a settlement agreement. But where there is any realistic risk of unfair dismissal or discrimination allegations – or where you want extra protections like confidentiality and non‑disparagement – a properly drafted settlement agreement is usually worth the cost.

[1] Based on UK Ministry of Justice statistics on employment tribunals.
[2] See Acas guidance on dismissals for good practice steps and procedures.
[3] See Acas guidance on managing staff redundancies.
[4] See UK government guidance on unfair dismissal compensation for current award limits and caps.

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