A probation period is one of the most common features of a new UK job and one of the least understood. New starters often assume it is a special legal status with its own rulebook. In reality it is a contractual arrangement, and most of your statutory employment rights do not wait for it to end. This guide explains what a probation period actually is, what to check in your contract, how reviews and extensions usually work and what questions to ask if a probation decision goes against you.

What a probation period actually is

A probation period is a trial phase written into an employment contract, typically lasting between one and six months. During this time the employer assesses whether you are suitable for the role and you assess whether the job matches what you were offered. The important point is that probation is a contractual label, not a separate category in employment law. Acas guidance on probation periods confirms that employees have the same statutory employment rights during probation as at any other time, and that any probationary terms sit inside the ordinary contract of employment.

What the label usually changes is the contractual detail. During probation an employer may apply a shorter notice period, restrict certain contractual benefits such as enhanced sick pay or apply a simplified version of internal procedures where the law allows. None of that removes the statutory floor. It only adjusts what the employer has chosen to offer above it.

Rights that apply from your first day

Several core rights apply from the start of employment regardless of any probationary label. You are entitled to receive at least the relevant minimum wage, to accrue paid statutory holiday from day one, to work in a safe environment, to receive payslips and to be free from unlawful discrimination because of a protected characteristic. Statutory holiday entitlement builds up from the first day of the job, so a probationary employee who leaves after eight weeks is still owed payment for accrued untaken leave.

You are also entitled to a written statement of employment particulars. GOV.UK explains that the principal statement must be provided by the employer on or before the first day of work, and that it must set out core terms such as pay, hours, holiday entitlement, notice and details of any probationary period, including its conditions and how long it lasts. See the official guidance on employment contracts and conditions. If you have not received this document, ask for it. It is the reference point for every later probation conversation.

What to check in the contract before you start

Read the probation clause before you sign, not after a difficult review meeting. Useful questions to answer from the written terms include the following.

  • How long is the probation period, and from which date does it run?
  • What notice applies during probation, from each side, and does it change on confirmation?
  • Can the employer extend probation, by how much, and on what grounds?
  • Which benefits, if any, begin only after successful completion?
  • How will performance be assessed, and are review meetings scheduled?
  • Who decides the outcome, and how is it communicated?

If the contract is silent on any of these points, ask in writing before your start date and keep the answer with your offer documents. A verbal reassurance that probation is just a formality has no contractual weight.

Notice during probation

Contracts often set a shorter notice period during probation, for example one week instead of one month. That is lawful, but statutory minimums still apply underneath it. Official guidance on notice periods explains that once an employee has worked for an employer for one month or more, at least one week of statutory notice applies, and the contract may provide more. The same logic applies in the other direction. If you resign during probation, check the contractual notice you owe rather than assuming you can leave on the day you decide.

Also check what the contract says about pay during notice, whether the employer can pay in lieu of notice and whether you can be asked not to attend work during the notice period. These details matter most in exactly the situation nobody plans for, so read them while the relationship is still positive.

How reviews and extensions usually work

A well-run probation includes clear objectives at the start, at least one interim review and a final decision meeting before the end date. The purpose of an interim review is that nothing in the final meeting should be a surprise. If concerns exist, you should hear them while there is still time to respond, with specific examples and a clear statement of what improvement looks like.

Employers sometimes extend probation instead of confirming or ending employment, usually where progress is mixed or where absence has reduced the assessment time. An extension should only happen if the contract allows it, and it should be confirmed in writing with a new end date and the specific areas under review. If you are offered an extension, ask for three things in writing: the reason, the measurable expectations for the extended period and the support the employer will provide. An extension without defined expectations mostly extends uncertainty.

Keep your own record throughout. Note the objectives you were set, the feedback you received, the dates of review meetings and examples of completed work. A dated, factual record is more useful than memory if the assessment is later disputed.

If probation ends badly

An employer can decide not to confirm employment at the end of probation, and with short service that decision is often lawful provided contractual notice is given and the reason is not an unlawful one. At the time of writing, ordinary unfair dismissal protection generally depends on a qualifying period of continuous employment, but some dismissals are unlawful regardless of length of service, including dismissal because of a protected characteristic, pregnancy or maternity, or for asserting certain statutory rights. The official overview of dismissal rules on GOV.UK explains the framework, and the rules can change, so check the current position rather than relying on a summary.

If your probation is failed, ask for the reason in writing, check the notice and accrued holiday pay you are owed, and compare the process followed with what your contract promised. If you believe the real reason was unlawful, seek advice promptly from Acas or Citizens Advice, because strict time limits apply to employment claims.

Treat probation as a two-way assessment

Probation is not only the employer judging you. It is your best evidence window for judging the job. Compare the duties you are given with the role you were sold, note whether promised training and supervision actually happen and raise gaps early and politely. If you completed a training or placement programme before this job, the same habits of keeping dated records and asking for written clarity apply here, and they will serve you at every later review as well.

Disclosure: Workplace Ready UK is owned by SRH CORP LIMITED, the organisation behind Excellent Pathways. This guide is general information about UK employment practice, not legal advice. Individual rights depend on your contract, your circumstances and the law in force at the time.