Sarah had been a marketing manager at her company for seven years—a tenure marked by consistently positive performance reviews, successful campaign launches, and steady career progression. On a Friday afternoon that began like any other, she was called into HR and informed that her position was being eliminated due to restructuring. She received a month's notice pay, was given 30 minutes to collect her belongings, and was escorted from the building by security.
The following Monday, still processing the shock, Sarah opened LinkedIn to update her profile. There, prominently featured in her feed, was her former role—same title, same responsibilities, same reporting line—advertised at a different salary band. She hadn't been made redundant; she had been replaced.
In another part of London, James had worked as a warehouse supervisor for four years. Following a single customer complaint about a delivery error, he was summoned to a brief meeting with his manager, informed that he was being dismissed for gross misconduct, and told to leave immediately. No investigation had occurred. No witnesses were interviewed. No documentation existed beyond the customer's email. No appeal was offered. James had never received any prior warnings in his entire tenure.
Both Sarah and James may have strong unfair dismissal claims. But navigating the employment tribunal system—with its strict time limits, procedural requirements, tactical considerations, and complex legal framework—requires understanding that many dismissed employees never acquire before their claims expire or their cases are undermined by avoidable mistakes.
This comprehensive guide provides that understanding.
1. The Legal Framework: Understanding Your Rights Under ERA 1996
7.1 What Unfair Dismissal Actually Means
Unfair dismissal is a statutory right created by the Employment Rights Act 1996 (ERA 1996). It protects qualifying employees from being dismissed without both a fair reason and a fair procedure—two distinct requirements that employers must satisfy independently.
To succeed in an unfair dismissal claim, an employee must first establish three threshold matters:
- Employee status: They must be an "employee" under ERA 1996, not merely a worker or self-employed contractor. This distinction—often contested in the gig economy—depends on factors including mutuality of obligation, personal service requirements, and the degree of employer control.
- Dismissal occurred: They must have been "dismissed" within the statutory meaning—either expressly terminated, not renewed at fixed-term expiry, or constructively dismissed by being forced to resign due to employer conduct.
- Qualifying service: Generally, they must have at least two years' continuous employment, though important exceptions exist for automatically unfair dismissals.
Once these threshold matters are established, the burden shifts to the employer to prove:
- Fair reason: The dismissal was for one of the five potentially fair reasons recognised by statute.
- Reasonable response: The employer acted reasonably in treating that reason as sufficient grounds for dismissal.
- Fair procedure: The employer followed a fair process in reaching and implementing the dismissal decision.
7.2 The Five Potentially Fair Reasons for Dismissal
Section 98(2) of ERA 1996 sets out five categories of potentially fair dismissal reasons:
1. Capability or Qualifications
The employee cannot perform the job to the required standard, whether due to skill deficiency, health issues, or loss of necessary qualifications.
Performance-related capability: The employer must typically demonstrate that performance concerns were clearly communicated, reasonable support or training was offered, improvement targets were set with realistic timeframes, and the employee was warned that continued failure could result in dismissal.
Health-related capability: Long-term sickness that prevents job performance can justify dismissal, but employers must obtain medical evidence, consider reasonable adjustments (particularly for disabled employees), explore alternative roles, and act only after a reasonable period of absence or where return is clearly not foreseeable.
Qualification-related capability: Loss of a qualification essential to the role—such as a driving licence for a delivery driver or professional registration for a regulated role—can justify dismissal, though employers should consider whether alternative roles exist that don't require the qualification.
2. Conduct
The employee has behaved inappropriately in a way that justifies ending the employment relationship.
Gross misconduct: Actions so serious that they justify summary dismissal without notice. Common examples include theft, fraud, violence, serious insubordination, gross negligence causing significant harm, and serious breach of health and safety rules.
Misconduct: Behaviour that falls short of gross misconduct but still warrants disciplinary action. Repeated instances, despite warnings, can ultimately justify dismissal. Examples include persistent lateness, minor insubordination, and breach of policies.
For conduct dismissals, fair procedure is critical. The ACAS Code of Practice on Disciplinary and Grievance Procedures sets out minimum requirements including investigation before action, notification of allegations, the opportunity to respond before decisions, and access to appeal.
3. Redundancy
The employer's requirement for employees to do work of a particular kind has ceased or diminished.
Genuine redundancy requires that the employer's need for the work—not the specific employee—has reduced. Sarah's situation fails this test: her role was immediately readvertised, demonstrating the work continued to exist.
Fair redundancy process requires meaningful consultation, fair selection criteria objectively applied, consideration of suitable alternative employment, and proper notice and redundancy payments.
4. Statutory Illegality
Continuing to employ the person would breach a statutory duty or restriction.
Examples include loss of right to work in the UK, disqualification from driving for a role requiring driving, and loss of required professional registration.
The employer must verify that continued employment would genuinely be illegal—not merely inconvenient—and should consider whether adjustments could enable lawful continued employment.
5. Some Other Substantial Reason (SOSR)
A catch-all category for dismissals that don't fit other categories but are nonetheless substantial enough to justify termination.
Common SOSR situations include irretrievable breakdown of working relationships, business reorganisation not amounting to redundancy, expiry of fixed-term contract for genuine business reasons, refusal to accept reasonable contractual changes, and third-party pressure to dismiss.
SOSR dismissals receive particularly close scrutiny because the category could otherwise become a loophole undermining employee protection.
7.3 Automatically Unfair Dismissals
Certain dismissals are automatically unfair regardless of the employer's reasons, procedures, or the employee's length of service:
| Protected Reason | Legal Basis | Special Features |
|---|---|---|
| Pregnancy or maternity | ERA 1996 s.99 | No qualifying period; protection during pregnancy and maternity leave |
| Asserting statutory rights | ERA 1996 s.104 | Includes bringing proceedings or alleging employer violated statutory rights |
| Whistleblowing | ERA 1996 s.103A | No qualifying period; uncapped compensation |
| Trade union activities | TULRCA 1992 s.152 | Includes membership, non-membership, and activities |
| Health and safety activities | ERA 1996 s.100 | Includes raising concerns and refusing dangerous work |
| TUPE transfers | TUPE Regs reg.7 | Unless for ETO reason entailing workforce change |
| Jury service | ERA 1996 s.98B | Performing or being summoned for jury service |
For automatically unfair dismissals, the two-year qualifying period doesn't apply, and compensation for some categories (notably whistleblowing) is uncapped.
2. Time Limits: The Critical Three-Month Rule
Employment tribunal time limits are strictly enforced. Missing a deadline can extinguish otherwise valid claims entirely, regardless of their merit.
7.4 The Basic Time Limit
Claims for unfair dismissal must be presented to the employment tribunal within three months less one day of the effective date of termination (EDT).
If you were dismissed on 15 January 2024, your ordinary deadline is 14 April 2024.
The EDT is typically:
- The last day of your notice period (if notice was given and worked or paid in lieu)
- The date summary dismissal took effect (if dismissed without notice)
- The date your resignation took effect (if constructively dismissed)
7.5 The ACAS Early Conciliation Extension
Before filing a tribunal claim, prospective claimants must contact ACAS for early conciliation. This mandatory step has important time limit implications.
When you notify ACAS of your prospective claim, the clock effectively pauses:
- Day A: The date ACAS receives your early conciliation notification
- Day B: The date ACAS issues the early conciliation certificate (either because conciliation concluded or the deadline passed)
If Day A falls before your original time limit would expire, you receive an extension calculated as follows:
- The period from Day A to Day B doesn't count toward your time limit
- You receive at least one additional month from Day B to file your claim
- If the extension would give you less time than your original deadline would have allowed, you get the benefit of your original deadline instead
Practical example: EDT is 15 January. Original deadline is 14 April. You contact ACAS on 1 April (Day A). ACAS issues certificate on 15 April (Day B). Your new deadline is 15 May (one month from Day B).
7.6 Extensions: The "Not Reasonably Practicable" Test
The tribunal may extend time if it was "not reasonably practicable" to present the claim in time, and the claim was then presented within a reasonable further period.
This is a high threshold. Circumstances that may justify extension include:
- Physical or mental incapacity preventing action
- Postal or system failures (with evidence)
- Misleading advice from the employer about rights or process
- Tribunal administrative error
Circumstances that rarely justify extension include:
- Ignorance of time limits (you're expected to take steps to find out)
- Awaiting outcome of internal appeals or grievances
- Illness that doesn't actually prevent filing
- Incorrect advice from solicitors (claim against them instead)
3. The ACAS Early Conciliation Process
Since May 2014, prospective claimants must contact ACAS before filing tribunal claims. This mandatory process aims to resolve disputes without litigation where possible.
7.7 How Early Conciliation Works
Step 1: Notification
Contact ACAS via their online portal or helpline, providing your details, prospective respondent details, and a brief description of your dispute. This triggers Day A for time limit purposes.
Step 2: Contact and Engagement
An ACAS conciliator contacts both parties to explore whether settlement is possible. Participation is voluntary—the employer can decline to engage without prejudice to their tribunal position.
Step 3: Conciliation Period
ACAS has up to six weeks to attempt conciliation: an initial one-month period, extendable by two weeks if progress is being made and both parties consent.
Step 4: Certificate Issuance
ACAS issues an early conciliation certificate containing a unique reference number (required for your tribunal claim) and the Day A and Day B dates (needed to calculate your deadline).
7.8 Settlement Through ACAS: COT3 Agreements
If parties reach settlement, ACAS records it as a COT3 agreement. Key features include:
- Binding effect: COT3 agreements are legally binding and waive tribunal claims on covered matters
- Tax treatment: Payments up to £30,000 for termination can be tax-free if properly structured
- No set formula: Settlement amounts are negotiated; there's no required relationship to tribunal compensation
- Scope: The COT3 should clearly specify what claims are being settled
Consider taking legal advice before finalising any COT3 settlement, particularly for complex or high-value claims.
4. Compensation: Understanding What You Can Recover
Tribunal compensation for unfair dismissal comprises two elements: the basic award (formulaic) and the compensatory award (loss-based), plus potential uplifts and additional elements.
7.9 The Basic Award
Calculated identically to statutory redundancy pay:
| Age at Dismissal | Multiplier Per Complete Year of Service |
|---|---|
| Under 22 | 0.5 week's pay |
| 22-40 | 1 week's pay |
| 41 and over | 1.5 weeks' pay |
Current limits (April 2024):
- Maximum week's pay: £700
- Maximum years counted: 20
- Maximum basic award: £21,000 (calculated as 20 years × 1.5 × £700 = £21,000)
The basic award may be reduced for contributory conduct or if you've already received a redundancy payment.
7.10 The Compensatory Award
Compensates actual financial loss caused by the dismissal. Common heads of loss include:
Immediate Loss of Earnings
Net pay lost from dismissal date to hearing date (or until new employment started), including regular overtime, commission, and bonuses you would have received.
Future Loss of Earnings
Projected ongoing loss beyond the hearing. Duration depends on circumstances—how long it's likely to take to find equivalent employment, considering your age, skills, and market conditions. Six to twelve months is common; longer periods may be justified in difficult markets or for older workers.
Loss of Statutory Rights
Compensation for losing the protection of employment rights (unfair dismissal protection, notice entitlement, redundancy entitlement). The conventional award is £500, though this can vary.
Loss of Pension
Lost employer pension contributions, calculated based on what the employer would have contributed during the loss period. For defined benefit schemes, complex actuarial calculations may be required.
Loss of Other Benefits
Value of lost benefits including company car, health insurance, life assurance, share options, and any other contractual benefits.
Current compensatory award cap (April 2024): The lower of 52 weeks' gross pay or £115,115.
The cap doesn't apply to automatically unfair dismissals for whistleblowing, health and safety activities, or asserting statutory rights.
7.11 ACAS Code Uplift
If the employer unreasonably failed to follow the ACAS Code of Practice on Disciplinary and Grievance Procedures, compensation may be increased by up to 25%.
Common failures triggering uplift include:
- No investigation before dismissal (like James's situation)
- No disciplinary hearing or opportunity to respond
- No right of appeal offered
- Predetermined outcome regardless of employee's response
- Failure to provide written reasons for dismissal
7.12 Injury to Feelings (Discrimination Cases)
Where dismissal involved discrimination, injury to feelings damages are available using the Vento bands (updated annually):
| Vento Band | Award Range (2024) | Applicable Cases |
|---|---|---|
| Lower Band | £1,200 - £11,700 | Less serious one-off incidents or isolated events |
| Middle Band | £11,700 - £35,200 | Serious cases not meriting upper band |
| Upper Band | £35,200 - £58,700 | Most serious cases, sustained campaigns of discrimination |
Exceptional cases may exceed the upper band where facts justify it.
7.13 Mitigation of Loss
Claimants have a duty to mitigate their loss by taking reasonable steps to find alternative employment. The tribunal will scrutinise:
- Whether you actively searched for work
- Whether you applied for suitable positions
- Whether you unreasonably rejected job offers
- Whether you took steps to enhance employability (training, updating CV)
Failure to mitigate can significantly reduce compensation, even for otherwise strong claims.
5. The ET1 Claim Form: Getting It Right
The ET1 is your formal claim document. Errors or omissions can delay proceedings, limit your claims, or even result in rejection.
7.14 Essential ET1 Contents
| Section | Purpose | Common Errors |
|---|---|---|
| Section 1: Claimant Details | Your identification and contact information | Outdated addresses; wrong contact details |
| Section 2: Respondent Details | Employer identification | Wrong legal entity; individual manager instead of company |
| Section 3: ACAS Details | Early conciliation certificate reference | Missing or incorrect certificate number |
| Section 4: Employment Details | Dates, job title, pay details | Incorrect dates affecting qualifying service |
| Section 5: Claim Type | Which claims you're bringing | Omitting related claims (discrimination, breach of contract) |
| Section 6: Claim Background | Factual narrative of what happened | Insufficient detail; argument instead of facts |
| Section 7: Remedy | What outcome you're seeking | Omitting heads of loss; unrealistic expectations |
7.15 Drafting the Details of Claim
Section 6—the narrative of what happened—is critically important. Effective drafting includes:
- Chronological account of relevant events
- Specific dates, individuals involved, and key communications
- Clear statement of why the dismissal was unfair (wrong reason, unfair procedure, or both)
- Facts supporting each element of your claim
- Losses suffered as a result of dismissal
Avoid:
- Excessive emotion or rhetoric
- Irrelevant background about general unhappiness
- Legal argument (save for submissions)
- Vague allegations without supporting detail
6. RUNO's Employment Tribunal Tools
The complexity of employment tribunal claims—strict time limit calculations, compensation computations, ACAS process management, Schedule of Loss preparation—has driven development of RUNO's dedicated Employment Tribunal module.
ET1 Claim Form Generator: AI-assisted drafting guides users through each section, ensuring all required elements are addressed and common errors are avoided. The system prompts for necessary information and generates properly formatted claim narratives.
ET3 Response Generator: For employers defending claims, the module produces comprehensive responses addressing each allegation and establishing available defences.
Schedule of Loss Calculator: Automatically calculates compensation using current statutory limits, applies Vento bands for discrimination claims, and generates formatted schedules ready for tribunal submission.
ACAS Deadline Tracker: Monitors early conciliation timelines, calculates extended deadlines, and alerts users to approaching limitation dates.
19+ Claim Type Coverage: Beyond unfair dismissal, the system supports wrongful dismissal, discrimination claims across all protected characteristics, whistleblowing, redundancy pay, and other employment tribunal matters.
7. Conclusion: Know Your Rights, Protect Your Position
Unfair dismissal law exists to ensure that employees aren't deprived of their livelihoods without good reason and fair process. Sarah, dismissed under the pretence of redundancy while her role was immediately readvertised, and James, summarily dismissed without investigation or process, both have strong claims—if they act in time and navigate the system effectively.
The employment tribunal provides accessible justice, but it operates within strict procedural frameworks that punish the unwary. Understanding your rights, calculating your deadlines correctly, preparing your claim thoroughly, and presenting your case effectively are all essential to achieving the justice the system promises.
Whether you're an employee considering a claim or an employer seeking to defend one, professional guidance—whether from solicitors, employment consultants, or sophisticated tools like RUNO's Employment Tribunal module—can make the difference between success and failure.
Explore RUNO's Employment Tribunal Tools or request a demonstration to see how technology can support your employment tribunal matter.