TL;DR: The UK's 2-year qualifying period for unfair dismissal claims is being reduced to 6 months from January 1, 2027, under the Employment Rights Act 2025, requiring HR teams to immediately update their dismissal procedures and employment contracts. However, numerous exceptions to this rule have always applied from day one of employment, meaning employers cannot dismiss employees without consequence regardless of service length.
Introduction: A Rule That's About to Change Everything
The 2-year qualifying period for unfair dismissal has shaped UK employment practice for decades. It's become a default assumption for many HR teams — a comfortable buffer during which dismissals feel relatively low-risk. But that assumption has an expiry date: 1 January 2027.
The Employment Rights Act 2025, which received Royal Assent in December 2025, will reduce the qualifying period from two years to just six months. For HR teams that have relied on the 2-year rule as a safety net, the transition period is already creating risk — not least because the exceptions that bypass the rule entirely have always applied from day one.
This article explains what the 2-year rule actually covers, which exceptions apply regardless of service length, the misconceptions that regularly land employers in employment tribunals, and what HR teams should be doing right now to prepare for the 2027 threshold change. Everything here is grounded in the Employment Rights Act 2025 and current ACAS guidance.
What Is the 2-Year Rule, Exactly?
Under the Employment Rights Act 1996, employees currently need two years' continuous service to bring an ordinary unfair dismissal claim. This is what's commonly referred to as the "2-year rule" — and it's one of the most searched employment law questions by HR professionals and employees alike.
Continuous service starts from the employee's very first day of employment. Crucially, it includes any probationary period. A six-month probation doesn't sit outside the qualifying period — it counts towards it.
So what does "ordinary unfair dismissal" actually mean? It covers situations where an employer dismisses an employee either without a fair reason or without following a fair procedure. The five potentially fair reasons for dismissal under UK law are: capability, conduct, redundancy, statutory restriction, or some other substantial reason (SOSR). If an employer can't point to one of these reasons and demonstrate a reasonable process, the dismissal may be unfair — but only employees with two or more years' service can bring that specific claim.
To answer the question directly: yes, in most cases, an employer can currently dismiss an employee with under two years' service without giving a detailed reason, and that employee cannot bring an ordinary unfair dismissal claim. But this is emphatically not a blank cheque. The 2-year rule is a narrow gateway to one specific type of claim — not a general shield against employment liability.
That distinction matters enormously, and it's about to matter even more. From 1 January 2027, the qualifying period drops to six months under the Employment Rights Act 2025. HR teams that haven't updated their probation processes, employment contracts, and dismissal procedures by then will face a significant increase in tribunal exposure.
The Exceptions That Apply From Day One
This is the section most employers get wrong — and where the majority of costly tribunal claims originate.
The 2-year rule applies only to ordinary unfair dismissal. A separate category of dismissals is deemed automatically unfair under UK law, and these carry no qualifying period whatsoever. An employee dismissed on their first day of employment can bring an automatically unfair dismissal claim if the reason for their dismissal falls into one of these categories:
- Whistleblowing: Making a protected disclosure under the Public Interest Disclosure Act 1998 (PIDA). If an employee raises a concern about wrongdoing — financial fraud, health and safety breaches, environmental violations — and is dismissed as a result, they are protected from day one.
- Health and safety concerns: Under Section 44 of the Employment Rights Act 1996, employees who raise genuine health and safety concerns or refuse to work in dangerous conditions cannot be dismissed for doing so. This protection applies regardless of service length.
- Pregnancy and maternity: Dismissal connected to pregnancy, maternity leave, or any related absence is automatically unfair from the first day of employment.
- Trade union activities: Dismissal for participating in, or refusing to participate in, trade union activities is automatically unfair.
- Asserting a statutory right: If an employee is dismissed for asserting a legal right — such as requesting the National Minimum Wage, querying a payslip, or asking for rest breaks — that dismissal is automatically unfair.
- Jury service: Dismissing an employee for attending jury service is automatically unfair.
- Working time rights: Dismissal for asserting rights under the Working Time Regulations 1998 — such as the right to rest periods or the 48-hour weekly limit — carries no qualifying period.
Discrimination claims under the Equality Act 2010 operate on an entirely separate basis. There is no qualifying period for discrimination claims. If a dismissal is connected — even partially — to a protected characteristic such as age, race, sex, disability, religion, or sexual orientation, the employee can bring a claim from day one of employment.
Consider a real scenario: an employee dismissed in month three after raising a concern about unsafe working conditions can bring both an automatically unfair dismissal claim under Section 44 ERA 1996 and a detriment claim. The 2-year rule offers zero protection in that situation.
The scale of this risk is significant. Approximately 15,000 unfair dismissal claims were accepted by employment tribunals in 2023/24, and a meaningful proportion of short-service claims that succeed do so via these exceptions — particularly discrimination. The financial and reputational cost of getting this wrong is substantial, and it exists entirely independently of the upcoming qualifying period change.
What Rights Do Employees Have Before 2 Years?
The idea that employees have "no rights" before two years' service is one of the most dangerous misconceptions in UK employment law. It's wrong, and acting on it is a reliable route to an employment tribunal.
Employees have significant day-one rights from the moment they start work. These include:
- Protection from discrimination under the Equality Act 2010
- Protection for whistleblowing under PIDA 1998
- The right to the National Minimum Wage
- The right to statutory sick pay (SSP)
- The right to a written statement of employment particulars
- The right to paid annual leave
- Protection under TUPE (Transfer of Undertakings) regulations
From April 2026, the Employment Rights Act 2025 expands day-one rights further. The waiting days for statutory sick pay are being removed, meaning employees qualify for SSP from their first day of illness rather than the fourth. Enhanced family leave entitlements also become day-one rights under the Act.
On redundancy, it's worth being precise. There is no qualifying period for collective redundancy consultation rights. If 20 or more employees are being made redundant, the obligation to consult applies regardless of how long those employees have been in post. Statutory redundancy pay, however, still requires two years' continuous service to qualify.
The practical framing here is important: think of the 2-year rule as a narrow gateway to one specific claim type — ordinary unfair dismissal — not a general shield against employment liability. Employees accumulate meaningful legal protections from day one, and those protections are expanding.
Managing Dismissals During Probation: What HR Should Actually Do
Probationary periods — typically three to six months — sit well within the 2-year window. But they are not a risk-free zone, and treating them as one is where many employers come unstuck.
Best practice is to follow the ACAS Code of Practice on Disciplinary and Grievance Procedures even for short-service employees. Failure to follow the Code won't create an unfair dismissal claim if the employee has under two years' service — but it can significantly aggravate a discrimination or whistleblowing claim if one is brought. Employment tribunals can increase compensation by up to 25% where an employer has unreasonably failed to follow the ACAS Code.
In practical terms, HR teams should take four steps before any probationary dismissal:
- Document performance concerns in writing throughout the probation period — not just at the end.
- Hold a formal review meeting before any dismissal decision is made, giving the employee advance notice of the concerns.
- Give the employee an opportunity to respond to those concerns before a final decision is reached.
- Check for any protected characteristics or recent protected disclosures before proceeding. This step is non-negotiable.
The "probation extension" trap is worth flagging separately. Extending probation without a clear process, defined timeline, or specific improvement targets creates ambiguity about employment status. It can also signal poor process if a claim is later brought — particularly if the extension coincides with a protected disclosure or a pregnancy announcement.
The post-2027 implication is significant. Once the qualifying period drops to six months, HR teams will need to complete meaningful performance reviews before 25 weeks of service — not at the end of a six-month probation. The timeline for documenting concerns and holding formal reviews will need to be built into onboarding calendars now, not retrofitted after the Act takes effect.
To illustrate the risk: an employee is dismissed at 18 months for "not being the right fit." No documentation, no formal meetings, no paper trail. Even without an unfair dismissal claim, if that employee is 52 years old and the replacement is 28, the employer has an age discrimination exposure that no qualifying period protects against. The 2-year rule is irrelevant. The Equality Act 2010 is not.
Common Misconceptions That Get Employers Into Trouble
Misconception 1: "We can dismiss anyone under 2 years without any process."
The reality is more nuanced. You can currently dismiss without a fair reason for ordinary unfair dismissal purposes — but you still need to avoid discriminatory or automatically unfair reasons. A basic process also reduces risk significantly, particularly given the expanding scope of day-one rights under the Employment Rights Act 2025.
Misconception 2: "Fixed-term contracts just end — no dismissal involved."
Non-renewal of a fixed-term contract counts as a dismissal in law. After two years' service, the employee can bring an unfair dismissal claim if there's no fair reason for non-renewal. And discrimination claims apply regardless of service length — so a fixed-term employee whose contract isn't renewed shortly after returning from maternity leave has a potential claim from day one.
Misconception 3: "Redundancy is covered by the 2-year rule."
Statutory redundancy pay requires two years' service, yes. But the right to be consulted in a collective redundancy situation — where 20 or more roles are at risk — applies from day one. From 2026, protective awards for failure to consult are set to double to 180 days' pay, making this a significantly more expensive mistake.
Misconception 4: "The 2-year rule will always be there."
It won't. From 1 January 2027, the qualifying period drops to six months. Legal forecasts project a 20–30% increase in unfair dismissal claims by 2027 as awareness of the new threshold grows among employees. Employers who haven't updated their probation processes, employment contracts, and dismissal procedures will face materially greater tribunal exposure — and potentially uncapped compensation awards.
What the Employment Rights Act 2025 Means for HR Teams Right Now
The Employment Rights Act 2025 received Royal Assent in December 2025 and is being rolled out in phases through 2026 and 2027. The key dates HR teams should have in their diaries are:
- April 2026: Day-one SSP and enhanced family leave rights take effect
- October 2026: Employment tribunal time limits extend from three months to six months
- January 2027: The unfair dismissal qualifying period drops from two years to six months
The preparation required isn't just administrative. It's structural. HR teams should be taking four concrete steps now:
- Audit current probation processes. Are they robust enough to withstand scrutiny at six months? Do they include documented performance reviews, formal meetings, and a clear improvement framework?
- Review employment contracts for any language that implies the 2-year rule as a protection or that could be read as limiting employee rights.
- Train line managers on the exceptions that apply from day one. This is where most claims originate — not in HR, but in line management decisions made without awareness of automatically unfair dismissal categories.
- Update dismissal checklists to include a discrimination and protected disclosure check at every stage, regardless of service length.
The compensation risk is also changing in a material way. The Employment Rights Act 2025 removes the cap on unfair dismissal compensation. Average awards currently sit at £10,000–£15,000; uncapped awards could significantly increase the financial exposure of getting dismissals wrong. The stakes for poor process have never been higher.
How AI Can Help HR Stay on Top of Employment Law Changes
As the Employment Rights Act 2025 rolls out in phases, HR teams are fielding more questions from employees and managers about their rights — often at inconvenient times, and often about nuanced areas like the 2-year rule, probationary dismissals, and day-one entitlements.
Here's the challenge: without a trusted, policy-grounded tool, employees turn to public AI like ChatGPT for employment law questions. The problem is that ChatGPT doesn't know your company's policies, your specific jurisdiction's rules, or the latest legislative changes. It guesses. In employment law, a guess can cost you a tribunal. Think of it this way: when a new starter asks "Can I be dismissed during my probation?" at 9 PM on a Tuesday, the answer they receive matters. An inaccurate answer — in either direction — creates risk. The right answer, grounded in current UK law and your company's probation policy, builds trust and reduces liability.
Aura is built specifically for this challenge. Rather than leaving employees to self-research on public AI tools, Aura provides instant answers grounded in verified UK employment law and your company's own policies — with clear citations, and intelligent escalation to your HR team when a question touches on a sensitive area like a potential whistleblowing concern or a discrimination issue. It's available 24/7, in the employee's language, without adding to the HR team's inbox.
Key Takeaways: What HR Teams Should Do Today
Three core messages to take away from this article:
- The 2-year rule applies only to ordinary unfair dismissal. Automatically unfair dismissals and discrimination claims apply from day one, regardless of service length. The rule is a narrow gateway, not a general shield.
- The qualifying period drops to six months in January 2027. Preparation should start now — not in late 2026. Probation processes, employment contracts, and line manager training all need to be reviewed.
- Process matters even for short-service dismissals. Document concerns in writing, hold formal review meetings, give employees an opportunity to respond, and check for protected characteristics before every dismissal decision.
Your HR action checklist:
- Audit probation processes for robustness at the six-month mark
- Train line managers on automatically unfair dismissal categories and day-one exceptions
- Update dismissal checklists to include a discrimination and protected disclosure check
- Review fixed-term contract renewal procedures
- Diary the April 2026, October 2026, and January 2027 implementation dates
- Review employment contracts for language that implies the 2-year rule as a protection
If your team is fielding more employment law questions as the Act rolls out, see how Aura gives employees instant, accurate answers grounded in UK law and your company policies — so your HR team can focus on the decisions that genuinely need human judgement.
