What the probation period is — and what it is not
A probation period is a contractual arrangement, typically lasting three or six months, during which an employer assesses a new employee’s performance, conduct and cultural alignment. It is not a statutory concept. It only exists if you put it in the contract.
Critically, a probation period does not:
- Remove statutory employment rights
- Disapply the discrimination law
- Avoid whistleblowing protection
-
Eliminate the requirement for reasonableness
What is changing under the Employment Rights Act 2025 is the qualifying period for ordinary unfair dismissal. Once implemented, employees will gain protection after six months’ service rather than two years.
For SME employers, that single change alters the dynamics of early employment management.
- You now have less time to identify capability issues.
- Less time to address behavioural concerns.
- Less tolerance for informal “wait and see” leadership.
The probation period becomes your primary assessment window — not an optional add-on.


