Until now, a new employee in Great Britain has generally needed two years of service before bringing the main claim for unfair dismissal. ACAS now says that the waiting period falls to six months from 1 January 2027, which affects almost every employer and recent starter.
In this article, we will explore what the sources report about the new qualifying period, what removing the compensation limit could mean, how probation periods fit, what fair process looks like, and where the reports differ on the timing of fire and rehire.
Six Months Replaces Two Years for Most Employees
The Headline Change
Acas states that from 1 January 2027 employees can claim unfair dismissal after six months in a job, instead of two years. A timeline published by VinciWorks in July gives the same shift but adds a detail worth noticing: it describes the cut as applying to dismissals taking effect from 1 January 2027. That wording points to the date employment ends, not the date an employer first raised a problem or the date a letter was written.
In practice this means that an employee given notice in December whose employment ends after 1 January 2027 appears, on the VinciWorks wording, to fall under the new rule. Anyone in that position, on either side, should check the point with Acas or an adviser rather than rely on a reading of two summaries. The date on which a dismissal takes effect can also be argued over, above all where notice is paid in lieu, so keep every letter.
What the Claim Protects
Unfair dismissal is a claim that an employer ended someone’s job without a fair reason, or without following a fair process, or both. A tribunal looks first at why the employer says it dismissed, then asks whether acting on that reason was reasonable in all the circumstances. It does not ask whether the tribunal would have made the same choice, only whether the employer’s choice fell within a range that a sensible employer could have made.
Before the change, an employee with under two years of service could usually be dismissed on notice without any fair reason, though not for reasons the law protects regardless of length of service, such as discrimination or whistleblowing. Those protections do not disappear or weaken. What changes is that the ordinary, everyday dismissal, the one with no discriminatory or whistleblowing angle, will now be open to challenge much earlier.
Who Is Covered, and Where
The right belongs to employees, not to everyone who does work for a business. Self-employed contractors and many casual workers fall outside it, and whether someone is an employee turns on the real working relationship, not the label in the paperwork. If your status is unclear, Acas guidance is the sensible first stop.
The Acas and VinciWorks material described here concerns the law of Great Britain. Northern Ireland has its own employment legislation, and readers there should not assume the same dates apply and should check the official sources for their nation. Everyone should also confirm their own continuous service: a previous stint with the same employer, a business transfer or a short gap can each affect how service is counted.
The practical way to check is to gather your offer letter, contract, first payslip and any later documents that mention a start date, then compare them. Employers should do the same exercise for their own staff list, because payroll records sometimes show a date that differs from the one in the contract, and the difference can decide whether a person has crossed the six-month line. A tidy spreadsheet of start dates and probation end dates is a cheap precaution that most small firms can set up in an afternoon.
| Aspect | Before the change | From 1 January 2027, per the sources |
| Service needed for an unfair dismissal claim | Two years | Six months (ACAS and VinciWorks) |
| Cap on compensatory awards | A statutory cap applied | Removed (ACAS and VinciWorks) |
| Dismissing or replacing someone to impose certain restricted contract changes | Judged case by case under the ordinary fair-reason rules | Automatically unfair, with narrow financial-difficulty exceptions (VinciWorks) |
| Fire and rehire | Judged case by case | Acas expects March 2027; VinciWorks lists it among its 1 January 2027 items, so check Acas |
Compensation Without a Cap Changes the Stakes
What Compensation Is Made Of
Acas says the compensation limit will be removed, and VinciWorks specifies that it is the statutory cap on compensatory awards for unfair dismissal that goes. The sources do not set out the old ceiling, and this article does not either; anyone dealing with a dismissal that took effect before 1 January 2027 should check the official figures that applied then.
It helps to know how an award is built. A successful claimant can receive a basic award, which is calculated by formula from age, weekly pay and years of service, and a compensatory award, which aims to cover the financial loss caused by the dismissal. Because the basic award leans on length of service, it tends to be modest for someone dismissed after only a few months. The compensatory award is where the removal of the cap bites, since it covers lost earnings until the person finds comparable work, lost benefits, reasonable expenses and a sum for loss of statutory rights.
Tribunals can also order reinstatement or re-engagement, though in practice money is the usual remedy.
Why Removing the Limit Matters to Employers
A cap gave employers a rough ceiling when weighing the risk of a contested dismissal. Without one, the ceiling becomes the claimant’s proven loss, which for a senior or well-paid employee, or for someone in a sector where replacement work is slow to find, could be large. I would expect that to change behaviour more than the shorter qualifying period does on its own, because it raises the cost of a mistake in the cases where mistakes are most expensive.
Nothing in the sources gives figures for how many claims are likely or what awards will look like, and anyone who quotes numbers with confidence is guessing. What can be said is that the old habit of treating a bad dismissal as a bounded cost of doing business looks harder to defend.
What the Change Does Not Do
Removing a cap does not make a claim easy to win, and it does not guarantee any award. A claimant still has to show the dismissal happened, and the tribunal still decides whether the employer acted fairly. Awards can be reduced where the employee contributed to the dismissal through their own conduct, or where the tribunal finds the person would have been dismissed fairly anyway had a proper process been followed.
Claimants also have a duty to reduce their losses by looking for work. Someone who dismisses the idea of job-hunting and waits for a tribunal date should expect any award to reflect that. Many disputes are resolved before a hearing, often after early conciliation through Acas, and a negotiated settlement is a perfectly normal ending that gives both sides certainty.
For employees, the lesson is that a claim is built on evidence of loss, so keep a record of job applications, interview invitations, any new earnings and the costs you incur. For employers, the lesson is that the cheapest moment to resolve a problem is early, before positions harden and before legal costs mount on both sides. A settlement agreement usually requires the employee to take independent advice, which is a protection for them and a benefit to the employer, since it makes the agreement harder to challenge later.
Probation Periods and the Six-Month Clock
Why Probation Now Matters More
Many contracts include a probation of three or six months. Under a two-year qualifying period, that was a comfortable cushion for employers, because a probation failure could be handled quickly with little legal exposure. A six-month probation now ends at just about the moment unfair dismissal rights begin, which makes the final weeks of probation the stage where employers have the most to think about and employees the most to lose.
A probation label does not switch off any statutory right. If someone is an employee and builds up continuous service, the clock runs whether or not the contract calls the period probationary, and extending a probation does not pause it. I expect employers to use probation reviews more carefully, with clearer objectives, earlier feedback and decisions taken well ahead of the sixth month and not in a rush at its edge.
Trial Periods, Short Contracts and Agency Arrangements
Trial periods in recruitment, such as a few days of paid work before an offer, raise different questions from probation inside a job. Whether someone is an employee during a trial depends on the arrangement, and the six-month clock only matters once an employee relationship exists. Where there is doubt, the safe assumption for an employer is that statutory protections may apply.
Fixed-term and rolling short contracts need similar care. Service with the same employer can be continuous across contracts, so a series of three-month deals does not necessarily keep the clock at zero. Agency workers and people who are truly self-employed sit differently, but employers should not assume a label settles the matter; check the current official guidance for the type of arrangement in question.
What a Sound Probation Review Looks Like
A sound review starts on day one with written expectations that a new starter can measure themselves against. It continues with regular one-to-one meetings that record what is going well and what is not, a fair chance to improve, and real help such as training or a changed workload where that is reasonable. If the employer concludes the person is not suitable, the reason should be recorded plainly and the employee given the chance to respond before the decision is final.
One tip for both sides: notice periods can interact with service. Statutory minimum notice builds with length of service and starts early, and in some situations the notice period can count toward the service needed for a claim. Do not rely on a calendar trick to dodge the threshold; check how it applies on the facts before relying on it either way.
Employees nearing the end of a probation should treat the final review as an important meeting. Ask for feedback in writing, ask what would make the review a success, and keep a short note of your own achievements with dates. If the outcome is negative, ask for the reasons in writing and whether there is a right of appeal. None of this guarantees a particular result, but a calm and well-documented response is more persuasive than a reaction made in the heat of the moment.
Fair Reasons and Fair Process Still Decide Every Case
Conduct and Capability
Longer-standing rules about what makes a dismissal fair are unchanged by the sources reviewed here, but they will now be tested far more often on shorter-serving staff. The law recognises a short list of potentially fair reasons. Conduct covers misconduct, from repeated lateness to serious breaches that can justify dismissal without notice, and employers are expected to investigate before they decide, not after.
Capability covers both performance and ill health. A manager who dismisses for poor performance should be able to show that standards were explained, that shortfalls were evidenced, that support was provided and that time to improve was given. For ill health, a fair approach usually involves obtaining medical information, talking with the employee and considering adjustments before concluding that the job cannot continue.
Redundancy
Redundancy is a fair reason when the need for employees to do particular work has ceased or diminished. It is also the area where process failures are most visible, because the steps are well known: consider whether the pool of affected roles is sensible, use objective selection criteria, consult before deciding and look for suitable alternative roles. Short-serving employees will now be able to challenge a selection that looks arbitrary or a consultation that was a formality.
A common pattern employers should avoid is deciding on names first and building criteria afterwards. Scoring that is recorded at the time, with reasons, is far easier to defend than recollections assembled once a claim letter arrives.
Where several people are at risk, employers should also think about timing and communication. Telling affected staff what is being proposed, why, and how they can contribute ideas is both fair and sensible, because it sometimes surfaces alternatives, such as reduced hours or redeployment, that the business had not considered. Collective consultation duties apply when larger numbers are involved, and VinciWorks lists an extra collective consultation threshold among reforms still awaiting dates.
Legal Bars and Other Substantial Reasons
Two further categories complete the list. One is where continuing the employment would break the law, such as when a driver loses the licence needed for the job, or when the right to work in the country cannot be established. The other is a wide residual category called some other substantial reason, which can cover a business reorganisation or a breakdown in working relationships.
For every reason, process counts as much as the reason. The Acas Code of Practice on disciplinary and grievance procedures sets out the standard steps: investigate, tell the employee in writing what the allegation or concern is, hold a meeting where they can be accompanied, decide, and offer an appeal. Tribunals can adjust compensation where a party unreasonably fails to follow the Code. A short-service employee who is dismissed without a meeting, without being told the allegation or without any right of appeal will now be able to point to those gaps in a way that was rarely worth doing before. Acas also says an updated Code of Practice is due in 2027, so employers should watch for it and update their handbooks when it appears.
Automatic Unfairness and the Fire and Rehire Date Question
What Automatically Unfair Means
Some dismissals are treated as unfair without the tribunal weighing whether the employer acted reasonably. The tribunal asks only whether the protected reason was the reason, or the main reason, for the dismissal, and if so the dismissal is unfair. Existing examples include dismissals connected with pregnancy or family leave, with raising a health and safety concern, or with making a protected disclosure, and many such claims do not depend on length of service.
The VinciWorks timeline says dismissing or replacing an employee to impose certain restricted contract changes will become automatically unfair, with narrow exceptions where an employer is in financial difficulty. In plain words, this is the fire and rehire provision: an employer dismisses staff and offers re-engagement on worse terms, or dismisses and replaces them with workers on new terms. Under the new rule, the employer would not argue that the business reason justified it in the ordinary way, except within the narrow exceptions the source mentions.
The Timing Difference Between the Sources
Here the sources do not agree, and I will say so plainly. Acas says fire and rehire is expected in March 2027, when it will become automatically unfair dismissal in most cases. VinciWorks puts the fire-and-rehire change among its 1 January 2027 items. One says March, the other places it with the January changes.
Because Acas is the public body and its page was updated on 30 October, its date is probably the better working guide, but I cannot tell you which is right, and neither can this article. Readers should check the Acas page for the date before planning anything, and treat all forward dates as subject to change: the VinciWorks material itself notes that future dates remain subject to parliamentary processes. An employer planning contract changes in early 2027 should take advice, and should assume the stricter timing may apply until the position is confirmed.
None of this means that businesses can never change terms. Changing a contract by agreement remains lawful, and sound consultation, with time to consider, a fair explanation of the business need and a real chance for staff or their representatives to suggest alternatives, remains the safest route. What the new provision is aimed at is the use of dismissal as a lever to force through changes that people have not agreed to, and employers who start conversations early are in a far better position than those who leave it to the last minute.
An employee faced with a demand to accept worse terms or lose their job should keep copies of every document, avoid signing in a hurry, ask in writing what the business reason is, and speak to Acas, a trade union representative or a solicitor before agreeing or refusing.
Other Changes on the VinciWorks List
VinciWorks lists further reforms with dates to be confirmed during 2027: stronger dismissal protection for pregnant workers and new mothers, statutory bereavement leave including pregnancy loss, rights for zero and low hours workers, a duty to consult on flexible working requests before refusing, mandatory gender equality and menopause action plans, an extra collective consultation threshold, regulation of umbrella companies, and restrictions on non-disclosure agreements in harassment cases. These are reported by a single source; they are not the subject of this article, and dates may change, so check Acas or official government guidance for the latest position.
Final Thoughts: A Practical Order of Action for Both Sides
If You Are an Employee
Start by working out your own dates. Find your contract or written statement of terms, your first payslip and any offer letter, and note your start date and any earlier periods with the same employer. If you are dismissed, ask for the reasons in writing and keep the dismissal letter, any emails or messages about performance or conduct, appraisals, and notes of meetings written up as soon as they end.
Contact Acas early. Early conciliation is a step before most tribunal claims, and time limits for tribunal claims are strict, so waiting to see whether things settle down can cost you the right to bring a claim; check Acas for the current limits. Do not sign a settlement agreement or a resignation letter on the spot, and take advice from a union representative, a law centre or a solicitor on your particular facts.
If You Manage or Employ Staff
Audit the contracts first: probation clauses, notice terms and any provisions that allow unilateral changes. Next, train line managers, because most unfair dismissal problems begin with a manager who did the right thing without writing it down or the wrong thing in a hurry. Make sure performance concerns are raised early, in writing, with a clear opportunity to improve.
Tidy the disciplinary and capability procedures and align them with the Acas Code. Review how you recruit as well, with clear job descriptions, proper references and realistic trial tasks, because a good hire is cheaper than a managed exit. Finally, plan for the fire and rehire date: if any restructuring that changes pay, hours or conditions is on the horizon, speak to an adviser before you consult staff.
If You Run a Very Small Business
A small firm with no HR department has the least capacity and the same legal duty. The proportionate answer is a short written disciplinary and capability procedure, a handful of template letters, a routine of recording meetings and a named person to ring when something goes wrong, whether a trade body helpline, an adviser or the Acas helpline. Some owners also consider legal expenses insurance, though policies vary and the small print matters.
Hiring may feel riskier for a while, but the answer is better process, not fewer contracts. Everything here is general information, not legal advice, and a professional or Acas can advise on a real case.
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Frequently Asked Questions
1. When Does the Six-Month Unfair Dismissal Rule Start?
Acas says it applies from 1 January 2027. VinciWorks describes it as applying to dismissals taking effect from that date, so what counts is when employment ends, not when the dispute began.
2. Can I Claim Unfair Dismissal After Seven Months in a Job?
If you are an employee and your dismissal takes effect on or after 1 January 2027, the sources say the service needed is six months. Whether you have a good claim then depends on the reason and the process, so contact Acas promptly and keep your documents.
3. Is There Still a Limit on Unfair Dismissal Compensation?
Acas says the compensation limit will be removed, and VinciWorks says the statutory cap on compensatory awards goes. Awards are still based on proven loss, and a tribunal can reduce them for the claimant’s own conduct or failure to look for work.
4. Does the New Rule Apply in Northern Ireland?
The sources discussed here concern Great Britain. Northern Ireland has separate employment law, so check the official guidance there before assuming the same dates or rules.
5. When Will Fire and Rehire Become Automatically Unfair?
The sources differ: Acas expects it in March 2027, while VinciWorks lists it among its 1 January 2027 items. Check the Acas page for the date, as forward dates can change.
6. Should I Contact Acas if I Have Been Dismissed?
Yes, and early. Acas can explain early conciliation, the time limits, and the steps open to you, and its helpline and guidance are free.
