UK Employment Law Unfair Dismissal Guide 2026
Complete guide to UK unfair dismissal law in 2026, including the current qualifying period, the 1 January 2027 six-month reform, five potentially fair reasons, automatically unfair dismissal, ACAS procedures, tribunal deadlines and compensation.
1. UK Unfair Dismissal Law in 2026: Current Rule vs 2027 Reform
The current ordinary unfair dismissal qualifying period in Great Britain remains generally 2 years of continuous employment during 2026. The Employment Rights Act 2025 changes this qualifying period to 6 months from 1 January 2027. The reform does not create a general Day 1 right to ordinary unfair dismissal. The government changed the proposed Day 1 model before the legislation was enacted. Existing Day 1 protections for discrimination and automatically unfair dismissal remain in place.
| Period | Ordinary Unfair Dismissal Qualifying Period | Important Point |
|---|---|---|
| During 2026 | Generally 2 years | Ordinary unfair dismissal normally requires 2 years' continuous employment |
| From 1 January 2027 | 6 months | Employment Rights Act 2025 reduces the ordinary qualifying period |
| Automatically unfair dismissal | No qualifying period for applicable grounds | Certain statutory reasons are protected from Day 1 |
| Discrimination | No 2-year qualifying period | Equality Act protections can apply from the beginning of employment |
2. The Five Potentially Fair Reasons for Dismissal
Under section 98 of the Employment Rights Act 1996, an employer must establish a potentially fair reason for an ordinary dismissal and then act reasonably in treating that reason as sufficient for dismissal. The five statutory categories are capability or qualifications, conduct, redundancy, statutory restriction and some other substantial reason (SOSR).
| Potentially Fair Reason | Meaning | Typical Example |
|---|---|---|
| Capability or Qualifications | Employee lacks the capability or qualifications required for the job | Persistent performance problems or inability to perform duties |
| Conduct | Employee has committed misconduct | Theft, dishonesty, repeated misconduct or serious breach of workplace rules |
| Redundancy | The role is redundant within the statutory meaning | Workplace closure, reduced requirement for employees or business reorganisation |
| Statutory Restriction | Continuing employment would breach a statutory restriction | Employee can no longer legally perform the role because a legal requirement prevents employment |
| Some Other Substantial Reason (SOSR) | Another substantial business reason capable of justifying dismissal | Certain genuine business reorganisations or serious relationship breakdowns |
3. A Potentially Fair Reason Does Not Automatically Make a Dismissal Fair
Having one of the five potentially fair reasons is only the first part of an ordinary unfair dismissal assessment. The employer must also show that it acted reasonably in treating that reason as sufficient to dismiss the employee in the circumstances. The tribunal normally considers the employer's size and administrative resources and whether the employer acted within the range of reasonable responses available to a reasonable employer. The tribunal does not simply substitute its own preferred business decision for the employer's decision.
4. Capability and Performance Dismissals
Where dismissal is based on capability or performance, a fair process will normally involve identifying the performance problem, explaining the required standard, giving the employee a reasonable opportunity to improve and providing appropriate support or training where appropriate. Persistent failure to meet required standards can potentially justify dismissal, but employers should normally consider warnings, review periods, evidence of performance and whether further improvement is reasonably achievable. Ill health can also fall within capability, but medical evidence, consultation, reasonable adjustments and discrimination law can become important.
5. Conduct and Gross Misconduct Dismissals
Conduct dismissals can involve misconduct ranging from repeated minor breaches to serious or gross misconduct. A fair disciplinary process normally involves investigating the allegations, informing the employee of the case, giving the employee an opportunity to respond and allowing an appeal against the decision. Gross misconduct can justify dismissal without notice where the employer's contract and circumstances support that outcome, but gross misconduct does not mean an employer can ignore procedural fairness.
6. Redundancy and Unfair Dismissal
Redundancy can be a potentially fair reason for dismissal, but a genuine redundancy situation does not automatically make every dismissal fair. Employers should normally identify the business reason, establish an appropriate selection pool where necessary, use fair and objective selection criteria, consult affected employees and consider suitable alternative employment where appropriate. Separate statutory collective consultation obligations can apply where an employer proposes 20 or more redundancies at one establishment within a 90-day period.
7. Statutory Restriction Dismissals
A dismissal can potentially be fair where continuing to employ the employee would contravene a statutory restriction. The employer should identify the legal restriction and establish that it genuinely prevents continued employment. Right-to-work problems can be relevant, but employers should not treat every immigration or documentation issue as an automatic entitlement to dismiss. Employers should establish the employee's actual legal right to work and follow a fair process where appropriate.
8. Some Other Substantial Reason (SOSR)
SOSR is a broad potentially fair category covering substantial reasons that do not fit neatly into capability, conduct, redundancy or statutory restriction. Examples can include certain genuine business reorganisations, serious relationship breakdowns or other substantial operational reasons. The employer must still show that the reason is substantial and that dismissal was reasonable in the circumstances. SOSR should not be used simply as a label to avoid the normal fairness requirements.
9. Automatically Unfair Dismissal: Day 1 Protection
Certain dismissals are automatically unfair without the normal qualifying period. These protections exist separately from ordinary unfair dismissal and remain Day 1 protections where the statutory conditions are met. Examples can include dismissal for specified pregnancy and family-leave reasons, whistleblowing, certain health and safety activities, asserting certain statutory employment rights, trade union activities and other protected statutory grounds. The exact statutory protection depends on the reason for dismissal and the relevant legislation.
10. ACAS Code of Practice for Disciplinary and Grievance Procedures
The ACAS Code of Practice on Disciplinary and Grievance Procedures provides a framework for handling disciplinary and grievance cases fairly. It is particularly relevant to misconduct and some other disciplinary dismissals. The Code is not itself a complete statutory disciplinary procedure, and employers do not automatically lose an unfair dismissal case merely because every recommendation in the Code was not followed. However, employment tribunals can take the Code into account and can adjust certain awards by up to 25% where a party unreasonably fails to comply.
11. Disciplinary Hearing and Right of Appeal
A fair disciplinary process normally gives the employee a reasonable opportunity to understand the allegations and respond before the employer makes a final decision. The employee should normally be informed of the allegations and possible consequences in advance, given relevant information and allowed to present their explanation. An appeal should be handled impartially where practicable and should consider the grounds of appeal rather than merely repeating the original decision.
12. Notice, Summary Dismissal and Payment on Termination
An employee dismissed with notice normally remains entitled to the contractual or statutory notice required by the employment relationship, subject to the applicable rules. Summary dismissal means dismissal without notice. It can potentially be justified in cases of gross misconduct, but the employer should still investigate the allegations and follow a fair disciplinary process where practicable. Final pay can include salary, accrued holiday entitlement and other contractual amounts. The tax treatment of termination payments depends on their nature.
13. Constructive Dismissal
Constructive dismissal occurs when an employee resigns in response to a fundamental breach of the employment contract by the employer. The employee does not receive a dismissal letter because the resignation is treated as the employer's repudiatory breach having caused the termination. Examples can potentially include serious non-payment of wages, a fundamental unilateral change to contractual terms or serious breaches of trust and confidence. Constructive dismissal claims are fact-sensitive and can be difficult to establish.
14. Employment Tribunal Time Limit
For an ordinary unfair dismissal claim, the employee normally must notify Acas for Early Conciliation and then bring the tribunal claim within 3 months less 1 day from the effective date of termination, subject to the effect of Early Conciliation on the limitation period. The claim should not be left until the final day. Acas Early Conciliation should be started as soon as possible when a tribunal claim is being considered.
15. Unfair Dismissal Compensation in 2026
For dismissals falling under the 2026 rules, the statutory employment tribunal limits apply. From 6 April 2026, the statutory maximum compensatory award for ordinary unfair dismissal is £123,543, subject to the statutory calculation rules and the separate cap of 52 weeks' pay where applicable. The Employment Rights Act 2025 removes the statutory cap on compensatory awards from 1 January 2027. The removal of the cap does not mean every successful claimant receives unlimited compensation; the tribunal still applies the statutory principles governing the losses that can be awarded.
16. Basic Award and Compensatory Award
An unfair dismissal award can contain a basic award and a compensatory award. The basic award is calculated using age, length of service and weekly pay subject to the statutory week's-pay limit. The compensatory award is intended to compensate the employee for financial loss resulting from the unfair dismissal, subject to the statutory rules applicable at the relevant time.
17. Unfair Dismissal and Discrimination Are Different Claims
Unfair dismissal and discrimination are separate legal claims. Ordinary unfair dismissal has a qualifying period, while discrimination protection does not generally depend on completing 2 years of employment. A dismissal can therefore potentially be discriminatory even where the employee cannot bring an ordinary unfair dismissal claim because they lack the required service. A dismissal can also be both unfair and discriminatory where the relevant legal conditions are satisfied.
18. January 2027 Unfair Dismissal Reform
From 1 January 2027, the Employment Rights Act 2025 reduces the qualifying period for ordinary unfair dismissal from 2 years to 6 months. The reform also removes the existing statutory cap on compensatory awards. The government did not proceed with a general Day 1 right to ordinary unfair dismissal. Employers should therefore prepare for a six-month qualifying period rather than a Day 1 ordinary unfair dismissal regime.
| Rule | 2026 | From 1 January 2027 |
|---|---|---|
| Ordinary unfair dismissal qualifying period | Generally 2 years | 6 months |
| Compensatory award cap | Statutory cap applies | Statutory cap removed |
| Automatically unfair dismissal | Applicable Day 1 protections remain | Applicable Day 1 protections remain |
| Discrimination | No 2-year qualifying period | No 2-year qualifying period |
19. Employer Unfair Dismissal Compliance Checklist
Employers should establish the reason for dismissal, check whether the reason is potentially fair, follow an appropriate procedure and consider all relevant statutory protections before making a dismissal decision.
Key Takeaways
- 2026 reforms establish Day 1 unfair dismissal protection for employees.
- Dismissals are only lawful if based on 1 of 5 statutory fair reasons.
- Employers must strictly follow the ACAS Code of Practice during disciplinary procedures.
- Failure to follow ACAS Code can result in a 25% compensation penalty uplift.
- Employment Tribunal claims must be submitted within 3 months minus 1 day from dismissal.
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