How to Dismiss a Probationer Lawfully —

The most expensive assumption a UK employer can make is that a probationer with under two years' service can be let go without consequence. Employment tribunals are full of cases that started with exactly that belief.

The two-year qualifying period is real. But it protects employers from only one type of claim — ordinary unfair dismissal. What it does not protect against is a category of rights that applies from the first day of employment, regardless of service length. Miss those, and a straightforward probation dismissal becomes an uncapped compensation claim.

The Two-Year Rule: What It Actually Does and Doesn't Protect

Under the Employment Rights Act 1996, employees generally need two years of continuous service before they can bring a standard unfair dismissal claim. This is the threshold most employers know and, in many cases, rely on.

What it does not cover:

Automatic unfair dismissal — which carries no qualifying period and no compensation cap

Discrimination claims under the Equality Act 2010

Whistleblowing claims under the Public Interest Disclosure Act 1998

Claims relating to statutory rights, health and safety, or trade union activity

Any one of these can arise from a probation dismissal. The employment tribunal does not ask how long someone worked for you before deciding whether to hear the claim — it asks why they were dismissed.

The Day-One Rights That Apply From the First Hour of Employment

The following rights apply to every employee from day one, with no qualifying period:

Protection from unlawful discrimination on the basis of any protected characteristic — age, sex, race, disability, religion, sexual orientation, pregnancy, marriage or civil partnership, gender reassignment

Protection for making a protected disclosure (whistleblowing)

Protection for asserting a statutory right — such as requesting the national minimum wage, statutory rest breaks, or written particulars of employment

Protection from dismissal related to health and safety activities

Protection from dismissal connected to jury service or trade union activity

A probationer dismissed while on sick leave may have an undisclosed disability. A probationer let go after raising concerns about a supplier's practices may be a protected whistleblower. In both cases, service length is irrelevant to liability.

The Discrimination Trap

Equality Act 2010 claims are among the most common routes by which probation dismissals end up at tribunal. Disability, pregnancy, and race are the protected characteristics most frequently cited in short-service cases.

Disability is particularly significant because many conditions are not disclosed at recruitment — and some employees may not realise they have a qualifying condition until after they start work. If a probationer's performance issues are linked to a mental health condition, a chronic illness, or a neurodivergent condition, dismissing without any reasonable adjustment consideration puts the employer at material risk.

"We didn't know" is not always a complete defence. If a manager observed symptoms — frequent absences, difficulty concentrating, visible distress — without making enquiries or adjustments, a tribunal may conclude the employer should have known.

The Whistleblowing Trap

If a probationer raises a concern about financial irregularity, health and safety, legal compliance, or environmental damage before or shortly before their dismissal, that disclosure may be protected under the Public Interest Disclosure Act 1998. Dismissal following a protected disclosure — even if the employer believes the reason is performance — is automatically unfair. Compensation is uncapped.

This is not a theoretical risk. Employment tribunals regularly see cases where a probationer raised a concern informally — a conversation with a manager, a message to HR — and was dismissed within weeks. The timing alone can shift the burden of proof.

Managing the Probation Process Correctly

The best protection against a tribunal claim is a well-documented probation process. That means:

Setting clear, written objectives at the start of employment — not vague standards, but specific, measurable targets

Conducting reviews at regular intervals — typically at one month, three months, and at the close of the probation period

Documenting concerns in writing at the time they arise — not reconstructed after the decision to dismiss has been made

Extending probation in writing, with a clear explanation of what improvement is required and by when, if standards are not yet met

Asking — and recording — whether the employee has any health conditions or personal circumstances affecting performance before concluding capability is the issue

A paper trail does not need to be lengthy. Brief, contemporaneous notes are far more credible at tribunal than a formal document written after the fact.

Executing the Dismissal Lawfully

When the decision to dismiss has been made, process matters as much as reason. These steps reduce risk materially:

Give the correct notice. Either the contractual probation notice period or the statutory minimum (one week after one month's service), whichever is greater. Pay in lieu if the employee is not working the notice period.

Hold a termination meeting. Even for short-service dismissals, a brief professional meeting reduces the likelihood of a hostile response and demonstrates the process was fair.

Consider the right to be accompanied. While not strictly required at a probation dismissal meeting, permitting accompaniment is best practice and reduces the risk of claims arising from the conduct of the meeting itself.

Issue a written dismissal letter. State the reason clearly — capability or conduct. Confirm notice payment and accrued holiday entitlement.

Be specific about the reason. "Not the right fit" will not satisfy a tribunal. A vague reason leaves space for a protected characteristic to fill the gap.

What One Case Can Cost

An employment tribunal claim for automatic unfair dismissal or discrimination carries no compensation cap. Injury to feelings awards in discrimination cases start at £1,100 and can exceed £45,000 in the most serious cases. Legal costs run to thousands before a hearing is reached.

A structured probation process costs time. An unstructured one can cost far more — and for a small business, the consequences can be existential.

"I dismissed someone in their first year without any documentation. I thought I was covered. The tribunal awarded £28,000. I didn't even know whistleblowing protection applied." — Anonymous employer, employment tribunal case