Probationary periods in UK employment contracts: what you can and cannot agree to

The offer letter looks great, then you reach the small print: "This role is subject to a six-month probationary period." Suddenly you are wondering whether that means you have fewer rights, less notice, or a job that can be pulled from under you at any moment. Before you sign, it helps to know exactly what that clause does and does not change.

Here is the core truth. A probationary period is a contractual trial window, nothing more. It does not switch off your statutory rights. You are an employee from your first day, and most of your legal rights apply from that first day too.

Key takeaways

• A probation period is a contractual trial window. It does not remove your statutory rights, which mostly apply from day one (gov.uk).
• There is no statutory maximum length. Three to six months is typical, and it can only be extended if your contract allows it.
• The National Minimum Wage, paid holiday, sick pay (payable from day one since 6 April 2026), discrimination protection, pension auto-enrolment and an itemised payslip all apply during probation.
• Ordinary unfair dismissal needs two years' service today, falling to six months on 1 January 2027 under the Employment Rights Act 2025. Day-one protections (discrimination, whistleblowing, pregnancy, asserting a statutory right) apply on probation regardless.
• You cannot contract out of statutory notice, the minimum wage, holiday, sick pay or discrimination protection, whatever your probation clause says.

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What a probationary period actually is (and is not)

A probationary period is a trial window written into your contract, during which your employer assesses whether you are right for the role and you decide whether the role is right for you. It usually comes with lighter notice on both sides and, sometimes, a formal review at the end.

What it is not is a suspension of your employment rights. Gov.uk is clear that probation periods are not required by law, and that your rights before and after probation are the same. You are a full employee throughout.

A lot of people assume "on probation" means "unprotected". It does not. Your contract can set performance conditions and short notice, but it cannot rewrite statute.

How long is a probation period in the UK?

There is no statutory maximum. The law does not cap probation length, so it comes down to what your contract says. Three to six months is standard for most roles, with senior positions occasionally running to twelve months.

Longer is not automatically a problem, but a long probation keeps you on lighter notice terms for longer, so read the notice provisions alongside the length before you decide it is reasonable.

Can a probation period be extended?

Usually only if your contract says so. A well-drafted probation clause will include an express right to extend, often by a set number of weeks or months, if your employer wants more time to assess you. Without that wording, extending your probation is a change to your agreed terms, which normally needs your agreement rather than a one-sided decision.

So when you read the clause, look for two things: whether an extension right exists, and if it does, how long the extension can be and what triggers it.

💡 Pro Tip: If the clause lets your employer extend probation "at its discretion" with no cap, ask for a limit. An open-ended right to extend keeps you on lighter notice terms indefinitely, which is exactly the situation the trial period was meant to resolve.

Your probation period rights from day one

Most of your key statutory rights do not wait for probation to end. They apply from your first day regardless of any trial clause:

• The National Minimum Wage or National Living Wage. Your employer must pay at least the statutory rate for your age from day one. A "training rate" below the legal minimum is not lawful during probation.
• Paid holiday. You accrue statutory holiday (up to 5.6 weeks a year) from the moment you start, and it builds up during probation like any other period of employment.
• Statutory Sick Pay. Since 6 April 2026, SSP is payable from your first day of sickness with no minimum earnings threshold, and being on probation does not disqualify you. Your employer can still hold back enhanced company sick pay until you pass.
• Protection from discrimination. The Equality Act 2010 protects you from day one against discrimination linked to a protected characteristic, including in how a probation decision is made.
• Pension auto-enrolment. If you are eligible, your employer must enrol you into a workplace pension, and probation does not change that duty.
• An itemised payslip. You are entitled to a written, itemised payslip on or before payday.
• Protection from automatically unfair dismissal. Some dismissal reasons are unlawful from day one, with no minimum service required: whistleblowing, pregnancy or a pregnancy-related reason, or asserting a statutory right (such as asking for the minimum wage you are owed).

None of these can be signed away by a probation clause. If your contract appears to remove any of them during probation, that part is not enforceable.

Failing probation and unfair dismissal: what changes in January 2027

Here is where probation genuinely does change your position. Ordinary unfair dismissal protection generally requires two years' continuous service. During a short probation you will not have that service, so you usually cannot bring an ordinary unfair-dismissal claim if you fail probation and are let go.

That is not the whole picture. The day-one protections above still apply: if a probation dismissal is really about your race, your disability, a pregnancy, or a health-and-safety concern you raised, that is potentially discrimination or automatically unfair dismissal, and those claims need no minimum service. Failing probation for genuine performance reasons is lawful. Being pushed out for an unlawful reason, dressed up as failing probation, is not.

This changes on 1 January 2027. The Employment Rights Act 2025 cuts the unfair dismissal qualifying period from two years to six months. It counts service you have already built up, so if you are employed on or before 1 July 2026 you gain that protection on the day it commences. For anyone signing now, a six or twelve-month probation may run past the point at which you acquire full unfair dismissal rights.

What your probation clause still controls after January 2027

The six-month qualifying period changes what probation means, but it does not make the clause irrelevant. Once unfair dismissal protection arrives at six months, probation stops being the thing that decides whether you can be let go easily. It still governs four things that affect you directly:

• Notice during the trial. A short probation notice still applies while you are in it, and that is what you get if the role ends early.
• Whether probation can be extended, and for how long. An extension keeps you on lighter notice terms for longer, which matters more once that is the main thing the clause still does.
• When contractual benefits start. Enhanced sick pay, private medical cover and similar perks can lawfully begin after probation rather than on day one.
• What "passing" actually means. The criteria, the review process, and whether the outcome is put in writing.

What it no longer does, from January 2027, is hand your employer a long window in which dismissal carries little risk. A six or twelve-month probation will sit partly on the far side of the qualifying period, so the clause and your statutory position run on different clocks. Read the length and the notice terms with that in mind.

Probation period notice: what applies during the trial

Notice is the other thing probation commonly changes. Two rules sit on top of each other, and you need both.

Your statutory minimum notice kicks in once you have one month's continuous service. From that point, your employer must give you at least one week's notice, and you must give at least a week too. In your very first month, before that statutory floor applies, the notice position is whatever your contract sets.

Contracts often set a short probation notice, for example one week either way, which is perfectly lawful as long as it does not drop below the statutory minimum once that minimum applies. A clause saying "no notice during your probationary period" only works in your first month; after a month's service, the one-week floor applies to what your employer must give you, whatever the clause says.

Notice usually steps up once you pass probation, so check the post-probation figure too. For how notice and pay interact, including being sent home to serve it, see our guide to notice periods and garden leave.

What you can and cannot agree to

This is the heart of it. A probation clause can shape the trial, but it cannot override statute. Here is where the line sits.

You cannot contract out of:

• Statutory minimum notice (once you have a month's service)
• The National Minimum Wage or National Living Wage
• Statutory paid holiday
• Statutory Sick Pay, if you qualify
• Protection from discrimination and from automatically unfair dismissal

You can validly agree to:

• A longer probationary period, or one with a clear extension right
• A shorter contractual notice during probation, down to (but not below) the statutory floor
• Reasonable performance conditions and objectives for passing probation
• Certain contractual benefits starting after probation rather than on day one (for example enhanced company sick pay, as long as your statutory rights are still met)

That last point is the common source of confusion. Your employer can lawfully hold back extra, contractual perks until you pass probation. It cannot hold back the statutory minimums, because those are not its to give or withhold.

Normal clause vs a clause to question

Not every unusual clause is a red flag, but some wording is worth a second look:

A clause in the right-hand column is not automatically unfair, but it is a prompt to ask a question before you sign.

What to check in your probation clause

When a probationary period employment contract lands in your inbox, read the clause with these five questions in mind:

1. Length. How long is the probation, and is it proportionate to the role?
2. Extension. Is there a right to extend, and if so, by how long and on what basis?
3. Notice. What notice applies during probation, what applies after, and does the probation figure stay at or above the statutory floor?
4. Benefits. Do sick pay, pay in lieu of notice or other benefits differ during probation, and is any statutory minimum affected?
5. "Successful completion". What does passing actually require? Vague, unmeasurable criteria make it harder to know where you stand.

While you are in the small print, check the wider termination clauses and any post-termination restrictions, since those bind you whether or not you clear probation.

One combination deserves its own look: a probation sitting inside a fixed-term contract. A six-month probation on a twelve-month contract puts you on lighter notice for half of it, on top of an end date you cannot move.

💡 Pro Tip: Ask for the passing criteria in writing before you start. "You'll be assessed on performance" is not a standard. Specific, measurable objectives protect you as much as your employer: they turn a subjective judgement into something you can deliver against.

What to do if the clause looks off

If something in the clause does not sit right, you have options, and none of them require an argument. Start by naming the specific concern, not the whole clause. Asking to "cap the extension right at three months", or to confirm notice stays at one week either way, is a small, reasonable request most employers will engage with. If a clause appears to cut a statutory right, say so plainly, since employers usually correct it once flagged.

If you are unsure whether a clause is standard or a problem, get it reviewed before you sign, so you are negotiating from information rather than a hunch. That is where Ookulli's employment contract review helps. Upload the contract and it flags the probation, notice and restriction clauses, explains each in plain English, and cites the exact clause and the UK law behind each flag, so you see the reasoning rather than take an AI's word for it. Your first contract review is free, a full review costs from £10 per document with no subscription and a 30-day money-back guarantee, and your document is never used to train AI models.

Frequently asked questions

Can my employer extend my probation period?

Usually only if your contract includes a right to extend, and within whatever limits that clause sets. Without such a right, extending your probation is a change to your agreed terms, which normally needs your agreement rather than a one-sided decision.

What notice do I get during my probation period?

Once you have one month's continuous service, statutory minimum notice applies: your employer must give at least one week, and so must you. In your first month, before that floor applies, the contract governs. A short probation notice such as one week either way is lawful, provided it never drops below the statutory minimum once that applies.

Do I get sick pay during my probation period?

Yes. Since 6 April 2026, Statutory Sick Pay is payable from your first day of sickness with no minimum earnings threshold, and probation does not disqualify you. Your employer can delay enhanced company sick pay (anything above SSP) until you pass, as long as your statutory entitlement is still met.

What rights do I have while I am on probation?

Most of your statutory rights apply from day one: the National Minimum Wage, paid holiday accrual, Statutory Sick Pay if you qualify, protection from discrimination under the Equality Act 2010, pension auto-enrolment, an itemised payslip, and protection from automatically unfair dismissal reasons such as whistleblowing or pregnancy. Probation removes none of them.

Can I be dismissed during probation without a reason?

If you have under two years' service, you usually cannot bring an ordinary unfair-dismissal claim, so a genuine performance-based dismissal during probation is lawful. But day-one protections still apply, so a dismissal that is really about discrimination, whistleblowing, pregnancy or asserting a statutory right can still be challenged. That two-year rule falls to six months on 1 January 2027 under the Employment Rights Act 2025, and the change counts service you have already accrued, so many people on probation now will gain unfair dismissal protection sooner than the two-year figure suggests.

This content is for informational purposes only and does not constitute legal advice. If you have specific concerns about your contract, consider consulting a qualified solicitor.