The New 6-Month Unfair Dismissal Rule: What UK Employers Must Do Now

Under current UK law, 2 years’ continuous service is usually required before an employee can claim ordinary unfair dismissal. For many employers, that 2‑year window has been treated as a “safer” period to exit hires who are not working out.

The government has signalled reforms that would shorten this qualifying period to 6 months. If a 6‑month unfair dismissal rule is introduced, your legal risk will arrive much sooner, forcing you to compress probation, performance management, and decision‑making into a much tighter timeframe.

This guide explains what a 6‑month rule would mean in practice, how it interacts with existing unfair dismissal protections, and the steps UK employers should take now to protect the business while still treating people fairly.

Quick Summary
What Is Changing In Unfair Dismissal Law?
Why A 6-Month Rule Increases Employer Risk
Key Timelines, Caps, And Costs
Step-By-Step: How To Update Your Processes
Common Mistakes To Avoid
Practical Checklist For Employers
How AirCounsel Can Help You Navigate Unfair Dismissal Risk
Frequently Asked Questions
Recommended

Quick Summary

Takeaway	Explanation
Plan for unfair dismissal protection after 6 months	A move from a 2‑year to a 6‑month qualifying period would mean many more staff gain unfair dismissal rights far earlier in their employment.
You will have less time to “fix” bad hires	Recruitment mistakes and early performance issues will need to be identified and addressed quickly, with structured probation and reviews from day one.
Fair process will matter much earlier	Once an employee qualifies for unfair dismissal rights, you generally need a fair reason and fair procedure to dismiss, in line with GOV.UK unfair dismissal guidance.
Existing “no qualifying period” risks remain	Claims involving whistleblowing, health and safety, asserting statutory rights, or discrimination can already arise from day one and are unaffected by any change to the qualifying period.
Documentation will make or break tribunal cases	Clear notes of performance concerns, meetings, warnings, and decisions are often crucial evidence if an unfair dismissal claim reaches a tribunal.
Early legal input can prevent expensive disputes	Getting contracts, probation processes, and exit strategies reviewed upfront is usually far cheaper than defending a tribunal claim later.

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Note: At the time of writing, the standard qualifying period for ordinary unfair dismissal remains 2 years. This article looks ahead to a potential 6‑month rule based on publicly discussed reforms. Always check current GOV.UK and ACAS guidance or obtain legal advice before taking action.

What Is Changing In Unfair Dismissal Law?

To understand the impact of a 6‑month unfair dismissal rule, it helps to start with how things work today.

The Current Position (Ordinary Unfair Dismissal)

According to official GOV.UK guidance on unfair dismissal, most employees can only bring an ordinary unfair dismissal claim if:

They are an employee (not a genuine self‑employed contractor).
They have 2 years’ continuous service with the employer (the “qualifying period”).
They were dismissed, and the employer did not have a fair reason or follow a fair process.

Fair reasons commonly include:

Conduct: Misconduct or gross misconduct.
Capability: Performance or health affecting ability to do the job.
Redundancy.
Statutory restriction: For example, loss of a right to work in the UK.
Some other substantial reason (SOSR): E.g., breakdown in working relationships.

A fair reason alone is not enough; process also matters. ACAS’s unfair dismissal guidance stresses the need to investigate, meet with the employee, consider their explanation, and allow appeals.

Automatic Unfair Dismissal And Discrimination (Day One Rights)

Some claims do not require any qualifying period. These are already high‑risk areas and will remain so, regardless of a new 6‑month rule.

No minimum service is needed, for example, where dismissal is linked to:

Whistleblowing (protected disclosures).
Health and safety activities or raising safety concerns.
Asserted statutory rights (e.g., requesting paid holiday or national minimum wage).
Pregnancy and maternity or other family‑related leave rights.
Trade union membership or activities.
Discrimination under the Equality Act 2010 (e.g., linked to disability, race, sex, religion, age).

Those are either “automatic” unfair dismissals or separate discrimination claims that can be brought from day one.

What A 6-Month Unfair Dismissal Rule Would Mean

If the government reduces the qualifying period for ordinary unfair dismissal from 2 years to 6 months, the main changes for employers would be:

More employees qualify, more quickly: After 6 months’ continuous service, most employees would gain unfair dismissal protection.
Probation periods would overlap with legal protection: Common 3–6 month probations would no longer sit safely outside unfair dismissal rights.
Short‑service dismissals become riskier: You could still dismiss for poor performance or “not the right fit”, but you would likely need stronger evidence and a more robust process.
Compensation exposure could increase: If reforms also review or lift the current compensation cap, potential tribunal awards may be higher.

Because details of any new rule (start date, transitional provisions, and potential changes to compensation caps) depend on final legislation, you should:

Monitor GOV.UK announcements.
Update your internal policies and contracts in sync.
Take legal advice on complex or high‑value dismissals.

Why A 6-Month Rule Increases Employer Risk

A 6‑month unfair dismissal threshold is not just a technical tweak. It fundamentally shifts when you must start acting as if every dismissal could be scrutinized by a tribunal.

Key risk impacts include:

Compressed timelines
You’ll have less time to:
- Spot performance or conduct issues.
- Provide training or support.
- Decide whether to confirm or end employment.
Probation is no longer a “safe zone”
Dismissing someone part‑way through or at the end of probation may still attract an unfair dismissal claim once they pass 6 months’ service.
Increased claim volume
More employees will become eligible to bring claims. Even where you have good prospects of success, a higher volume of claims means more management time, legal costs, and distraction.
Higher settlement pressure
Shorter‑service employees may have lower loss of earnings, but if the compensation cap is reviewed or removed, high earners and specialist roles may carry significant exposure.
Reputational and employee relations risk
Poorly handled dismissals can damage your brand (especially for smaller businesses in tight local or sector talent pools) and harm morale among remaining staff.

The solution is not to stop making tough decisions; it is to make them earlier, more deliberately, and with clean processes and documentation.

Key Timelines, Caps, And Costs

The exact details of any 6‑month unfair dismissal rule will depend on the final legislation and transitional rules. The table below focuses on planning assumptions and the direction of travel so you can start preparing.

Item	Current position (most employees)	Planning assumption under a 6‑month rule
Qualifying period for ordinary unfair dismissal	2 years’ continuous service.	6 months’ continuous service. Much earlier need for fair reason and process.
Day one protections	Automatic unfair dismissal and discrimination claims can already arise with no minimum service.	Unchanged: day one protections still apply, alongside wider access to ordinary unfair dismissal after 6 months.
Compensation cap (basic + compensatory award)	Capped at the lower of 52 weeks’ gross pay or a statutory maximum updated annually (recently just over £100,000).	Reforms may review or change this. If the cap is lifted or increased, high‑value claims become more expensive.
Legal and management time	A contested case can already absorb dozens of hours of HR/management time plus legal fees.	Potentially more cases reaching tribunal if more employees qualify, increasing time and cash cost.
Exit strategy	Many employers rely heavily on “short‑service” dismissals or informal exits before 2 years.	You will need clearer probation processes, better evidence of performance issues, and much more careful handling of exits beyond 6 months.

Because annual limits and any new caps change regularly, you should always check current tribunal award limits when assessing risk.

Step-By-Step: How To Update Your Processes

Treat the move to a 6‑month unfair dismissal rule as a business change project, not just a legal tweak. These steps will help you get ahead of it.

Step 1: Audit Recruitment And Contracts

Your first line of defense against unfair dismissal risk is hiring well and documenting terms clearly.

Key actions:

Review job descriptions and adverts
- Make sure they reflect the actual role requirements.
- Avoid wording that could be interpreted as discriminatory.
Tighten selection and interview processes
- Use consistent criteria and scoring.
- Keep notes that explain why the successful candidate was chosen.
Update employment contracts
- Build in clear probation terms (length, review points, extension rules).
- Include reasonable notice periods, especially during probation.
- Specify conduct and performance expectations.
- Clarify any flexibility in duties or location, within reason.
Align contracts with policies
- Your disciplinary, capability, and grievance procedures should support fair handling of problems and be referenced in contracts or handbooks.

If your contracts are dated or inconsistent across staff, consider a full refresh using a solicitor‑drafted template. AirCounsel’s Custom Employment Agreement service gives you UK‑compliant contracts tailored to your business model and risk appetite.

Step 2: Tighten Probation And Early Reviews

Under a 6‑month rule, probation can no longer be a vague “wait and see” period. It must be structured and proactive.

Practical steps:

Set clear expectations on day one
- Share a written role profile.
- Explain performance standards and key metrics.
- Outline the probation process and potential outcomes.
Schedule regular review points
For example:
- Week 2: “How’s it going?” check‑in.
- Month 1 and 3: Formal review meetings with brief written notes.
- Month 5: Final major review to decide whether to confirm or exit.
Act early on red flags
- Don’t wait until month 5.
- If serious issues emerge in month 2, address them then: clear feedback, support, and, where needed, a warning.
Be realistic about training time
- If a role has a long ramp‑up, build that into your plan.
- You may still need to make decisions while someone is learning, but they should not be surprised by any concerns you raise.
Use probation extensions carefully
- If you extend, be clear about what must change and by when.
- Remember: any change to the qualifying period doesn’t automatically move with your probation; legal rights may still kick in at 6 months.

Step 3: Strengthen Performance And Conduct Management

Once employees cross the unfair dismissal threshold, process becomes critical.

Actions to take:

Update disciplinary and capability policies
- Align them with the ACAS Code of Practice on Disciplinary and Grievance Procedures.
- Make sure policies clearly distinguish between conduct (won’t do) and capability (can’t do).
Train managers
- How to give clear, specific feedback.
- How to run investigation and disciplinary meetings.
- When to involve HR or legal.
Use performance improvement plans (PIPs) where appropriate
- Set realistic, measurable objectives.
- Agree support (training, supervision, tools).
- Set review dates and consequences if performance remains poor.
Avoid knee‑jerk dismissals
- Immediate dismissals should be reserved for serious misconduct and still typically require fair investigation.
- For capability issues, warnings and an opportunity to improve are usually expected before dismissal.

Step 4: Improve Documentation And Record-Keeping

In an unfair dismissal claim, tribunals heavily rely on contemporaneous documents. If it isn’t written down, it is much harder to prove.

At minimum, keep:

Signed employment contracts and any amendments.
Evidence of right‑to‑work checks.
Induction and training records.
Performance review notes and action points.
Emails or notes of informal feedback and coaching.
Investigation notes, witness statements, and outcome letters for disciplinary cases.
Records of reasonable adjustments for disabled employees.
Any settlement agreements, including evidence that the employee took independent legal advice.

Even basic systems (shared HR folders with clear naming conventions and access controls) are better than scattered emails.

Common Mistakes To Avoid

When qualifying periods change, employers often carry old habits forward. That is where risk creeps in.

Avoid these pitfalls:

Assuming you still have 2 years to “test” someone
Planning headcount and performance management on outdated rules is a fast route to claims.
Treating probationers as disposable
Informal “you’re just not the right fit” dismissals with no evidence or process can be risky once a shorter qualifying period is in place.
Ignoring day one risks
Even before 6 months (or 2 years under current law), dismissals linked to pregnancy, whistleblowing, health and safety, or discrimination can be very expensive.
Failing to train front‑line managers
Managers who don’t understand unfair dismissal basics can, with the best intentions, say or do things that later look unreasonable or discriminatory.
Relying solely on verbal conversations
Without written records, it becomes your word against the employee’s in tribunal.
Using outdated templates and policies
Old handbooks or copied internet policies may conflict with current law or with each other, weakening your position.

Practical Checklist For Employers

Use this high‑level checklist to plan your response to a 6‑month unfair dismissal rule. Adjust owners and dates to fit your organization.

Area	Action	Owner	Target date
Legal audit	Confirm current unfair dismissal rules, proposed changes, and implementation date; review contract templates and policies.	HR Director / Legal	ASAP
Contracts	Update offer letters and contracts to align with new qualifying period and probation strategy.	HR / Legal	Before hiring next cohort
Policies	Refresh disciplinary, capability, and grievance procedures; ensure they reflect ACAS guidance.	HR	Within 1–2 months
Manager training	Deliver unfair dismissal and probation management training to line managers and team leads.	HR / L&D	Within 3 months
Probation process	Standardize probation length, review points, and documentation across the business.	HR / Department heads	Within 3 months
Documentation	Implement or tighten HR record‑keeping and file structures for contracts, reviews, and investigations.	HR / IT	Within 3–6 months
Exit strategy	Create playbooks for managing under‑performance, redundancies, and settlement discussions under the new regime.	HR / Legal / Finance	Within 6 months

How AirCounsel Can Help You Navigate Unfair Dismissal Risk

A shorter unfair dismissal qualifying period means you have less margin for error. Getting your foundation documents and processes right now is far cheaper than firefighting tribunal claims later.

AirCounsel connects you with UK‑qualified solicitors who can:

Design robust employment contracts and probation clauses tailored to your business.
Stress‑test your disciplinary, capability, and redundancy procedures against current law and likely reforms.
Help you navigate difficult exits and settlement agreements quickly and discreetly, on fixed fees.

UK employer meeting with an employment solicitor to review unfair dismissal and probation processes

If you want to reduce unfair dismissal risk while keeping hiring fast and flexible:

Use Custom Employment Agreement to put in place clear, compliant contracts that support your probation and dismissal strategy.
When exits are on the table, our Custom Employee Settlement Agreement service gives you tailored agreements that close off claims and protect confidentiality.
For ongoing support as the law changes, the All-Access Legal Membership (UK) offers unlimited consultations and discounted services so you can sense‑check tricky dismissals before acting.

Frequently Asked Questions

What is the qualifying period for unfair dismissal claims in the UK right now?

Currently, most employees need 2 years’ continuous service before they can bring an ordinary unfair dismissal claim. However, no qualifying period is required for certain types of claims, such as discrimination or automatic unfair dismissal (for example, dismissal linked to whistleblowing or health and safety). Because rules can change, always check the latest GOV.UK and ACAS guidance or take legal advice.

How would a new 6-month rule change my obligations as an employer?

If the qualifying period is reduced to 6 months, many employees will gain unfair dismissal rights much earlier. You would need to treat dismissals after 6 months as potentially challengeable in tribunal, with a clear fair reason and a reasonable process. Practically, this means tightening recruitment, probation, performance management, and documentation so problems are spotted and handled early.

Are there any dismissal reasons that still carry no qualifying period?

Yes. Regardless of the qualifying period for ordinary unfair dismissal, some claims have no minimum service requirement, including discrimination, dismissal for making a protected disclosure (whistleblowing), certain health and safety‑related dismissals, and dismissal for asserting specific statutory rights (such as requesting the national minimum wage or paid holiday). These “day one” risks already exist and remain high‑stakes under any new regime.

What should I change in my probation and performance management procedures?

You should introduce structured probation reviews (for example, at 1, 3, and 5 months), improve written feedback and action plans, and ensure managers are trained to address under‑performance promptly and fairly. Your disciplinary and capability policies should be updated to align with ACAS guidance, and your contracts should clearly set out probation terms, notice, and expectations.

Does a shorter qualifying period mean I can’t dismiss people in their first 6 months?

You can still dismiss employees in their first months of employment, but you must avoid unlawful reasons (such as discrimination or retaliation for whistleblowing) and take care with how you handle the process. Some employers may still prefer to follow a light‑touch but fair procedure even for very short‑service staff, particularly where there is any hint of a protected characteristic or complaint in the background.

When should I get legal advice about a dismissal?

You should seek advice where the employee is near or past any qualifying period, has raised concerns about discrimination or whistleblowing, is pregnant or on family leave, or where the role is senior or sensitive. It is usually more cost‑effective to get 1–2 hours of advice before dismissing than to try to “fix” a poorly handled process once a claim has been issued.