How do probation periods work legally in the UK?
By SuLe · Updated 10 May 2026
A probation period is currently contractual only — it does not remove an employee's statutory rights. Its main legal effect today is a shorter notice period during the initial months. Day-one rights apply throughout. This is set to change under the Employment Rights Act 2025's statutory probation regime, expected around 2027 — check the current status.
Key facts
- Probation periods are currently contractual only — they do not remove statutory rights.
- The main legal effect today is a shorter contractual notice period during probation.
- Day-one claims (discrimination, whistleblowing, health-and-safety, asserting a statutory right) apply throughout probation.
- 3–6 months with a mid-point check-in is standard practice, often with a single extension option.
- A statutory probation regime is expected under the Employment Rights Act 2025 — commencement expected 2027, check current status.
What does a probation period actually do legally?
Less than most founders assume. Today, probation is a purely contractual concept — it is not a special legal status that suspends employment rights while you decide whether someone fits.
Its practical legal effect is narrow: the contract usually gives a shorter notice period during probation, so either side can end the relationship more quickly. It can also gate certain contractual benefits until probation is passed.
What it does not do is remove statutory protections. An employee on probation still has all their day-one rights, and passing probation does not, by itself, change their statutory position — statutory unfair dismissal rights turn on length of service, not on whether probation was passed.
Do employees keep their rights during probation?
Yes — and this is the point founders most often miss. A probationer has the same day-one statutory rights as anyone else: protection from discrimination under the Equality Act 2010, whistleblowing protection, health-and-safety protection, and the right not to be dismissed for asserting a statutory right.
Those claims have no qualifying period and, for discrimination and whistleblowing, no cap on compensation. So "they're still on probation" is not a defence to an unlawful reason for dismissal.
What probation-length staff usually lack today is ordinary unfair dismissal protection, which currently needs two years' service (as of mid-2026). That lowers the risk of a straightforward performance dismissal, but never eliminates it — a dismissal that looks discriminatory or retaliatory is actionable from day one.
How should a startup run probation — and what is changing?
Keep it simple and fair. A three-to-six-month period with a mid-point check-in is standard, giving both sides an honest review before the end. Build in the ability to extend once if you need more time, and set a shorter notice period during probation.
Even during probation, follow a light but fair process before dismissing: give a genuine reason, hold a short conversation, give contractual notice, and document it. Following the spirit of the Acas Code protects you against a day-one claim dressed up as a performance issue.
Reform is coming. The Employment Rights Act 2025 is expected to introduce a statutory probation regime and remove the two-year qualifying period, so probation gains real legal significance as a lighter-touch dismissal window. Commencement is expected around 2027 and the detail was not finalised when this was written — check the current rules before relying on today's position.
| Aspect | Today | Expected under ERA 2025 (verify) |
|---|---|---|
| Legal status of probation | Contractual only | Statutory probation regime |
| Unfair dismissal qualifying period | 2 years (as of mid-2026) | Removed — day-one right |
| Effect of probation | Shorter notice period | Lighter-touch dismissal process |
| Day-one claims | Apply throughout | Continue to apply |
Worked example
Hannah runs a proptech startup and hires a product manager, Ben, on a six-month probation with a one-week notice during probation and one month afterwards. At the three-month check-in, performance is mixed, so Hannah extends probation by two months, as the contract allows, and sets clear objectives.
When Ben does not improve, Hannah holds a short review meeting, gives him a genuine performance reason and his one-week probationary notice, and documents that the decision had nothing to do with any protected characteristic or complaint. Because Ben is well under two years' service, ordinary unfair dismissal does not apply — but Hannah's clean, non-discriminatory record is what protects her from a day-one claim.
Where founders go wrong
Treating probation as a rights-free zone
— day-one claims apply throughout, whatever the probation clause says.Skipping any process during probation
— a short, documented, non-discriminatory process is still worth doing.Forgetting to confirm or extend in writing
— let probation lapse silently and you lose the shorter-notice advantage.Ignoring the reform timetable
— a statutory probation regime is expected; design your process to work under both systems.
Related questions
Does probation remove an employee's legal rights?
No. Probation is contractual only at the moment — it does not strip away statutory rights. Day-one rights like protection from discrimination and whistleblowing apply throughout probation. Its main legal effect today is simply a shorter contractual notice period during the initial months. [More: When do employees get unfair dismissal rights in the UK?]
How long should a probation period be?
Three to six months is standard, often with a mid-point check-in and the option to extend once. Keep it proportionate to the role. Remember the probation length is a contractual choice today, but a statutory probation regime is expected under the Employment Rights Act 2025 — check the current rules.
Can I dismiss during probation without process?
You should still follow a fair, if lighter, process and give contractual notice. Under two years' service, ordinary unfair dismissal usually doesn't apply (as of mid-2026), but day-one claims do. Document a genuine reason and avoid anything that could look discriminatory. [More: How do I legally dismiss an employee in a UK startup?]
Is probation changing under employment law reform?
Yes. The Employment Rights Act 2025 is expected to introduce a statutory probation regime alongside removing the two-year unfair dismissal qualifying period, with commencement expected around 2027. The detail was not finalised at the time of writing, so check the current position.
Probation feels like a safety net, but it does not remove day-one rights today and its meaning is about to change under reform — so how you draft and run it matters. A SuLe solicitor can set your probation clauses and process for both the current and incoming rules. Book a free consultation about your contracts and get it right.
Keep reading: When do employees get unfair dismissal rights in the UK? · How do I legally dismiss an employee in a UK startup? · What notice period should startup employment contracts use? · What must a UK employment contract include? · How do I hire my first employee in the UK (legal checklist)?
Primary sources: GOV.UK — Employment contracts · Acas — advice and codes of practice
