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Blog • 29.06.26

The 6-month rule change: Why your probation periods need a rethink now

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From 1 January 2027, UK employees will gain the right to claim unfair dismissal after just six months of service (down from two years). This significantly reduces the time employers have to assess new hires and increases the importance of structured probation and performance management.

The change also removes the compensation cap, increasing the financial risk of getting it wrong.

While January 2027 might feel a long way off, the reality is that these changes are already affecting decisions you’re making today.

So, what does this mean for probation periods – and what should you be doing now?

Why the 6 month unfair dismissal rule matters for UK employers

Historically, employers have effectively had a two-year “window” to assess whether someone is the right fit, with relatively low legal risk if things didn’t work out.

That flexibility is disappearing.

From 2027, employees will gain unfair dismissal protection after just six months of service, meaning:

  • You’ll have significantly less time to make hiring decisions
  • The margin for error during probation becomes much smaller
  • Informal or delayed performance management becomes much riskier

In simple terms: what used to be a two-year safety net is becoming a six-month deadline.

The hidden reality: it’s actually less than six months

One crucial detail many employers overlook is that you can’t wait until the six-month mark to act.

Because of how notice periods are calculated, employees can effectively gain protection slightly before six months. Meaning you need to make decisions earlier to stay within a lower-risk window and you should aim to make final decisions at around 5 to 5.5 months, not at six.

How to restructure probation periods under the new UK rules

Traditional probation structures (like 6 months, or 3 months + 3 month extension) are no longer best practice.

Instead, businesses should realign probation periods to fit within the new timeframe.

A smarter approach:

  • 3-month initial probation
  • Extension of up to 2 months
  • Total: maximum 5 months

This gives you enough time to assess performance while maintaining a buffer before employees gain protection.

Managing performance within the 6‑month probation window

When you only have a few months to assess someone, early action is critical.

Under the new rules, you can’t afford to “wait and see” – performance concerns need to be addressed immediately, and clear documentation becomes essential.

For employees approaching the six-month point, you’ll need:

  • A fair reason for dismissal (e.g. performance, misconduct, redundancy)
  • A fair process (meetings, warnings, opportunity to improve)

If you haven’t already started that process early, you may be forced into a much longer and more formal route.

Why onboarding is now business-critical

With such a short timeframe, the first few weeks matter more than ever.

If a new hire isn’t clear on expectations early on, you risk wasting valuable assessment time, missing the window to act and increasing the likelihood of performance issues later.

Employers should focus on structured onboarding, including clear expectations and early check-ins. Following onboarding milestones for UK employers can help ensure consistency.

Because ultimately, the goal isn’t just to manage risk. It’s to help employees succeed faster.

How to track probation reviews effectively

One of the biggest risks businesses face is simply running out of time. Without proper tracking, reviews can easily be delayed, decisions get pushed back, and employees unintentionally pass the critical threshold.

To avoid this, it’s important to take a more structured approach. As a minimum, businesses should introduce monthly probation reviews, supported by regular informal check-ins, especially in the early weeks, and make use of automated reminders to keep key milestones on track.

A simple structure might include an initial check-in at week two, followed by reviews at the end of month one and month two, before a more formal assessment at month three. From there, a clear decision can be made on whether to confirm employment or extend probation if needed.

Ultimately, the key is consistency and visibility, making sure nothing slips through the cracks.

Why managers are key to managing probation risk

Your managers will play a crucial role under the new rules. They’re the ones responsible for spotting performance concerns early, carrying out reviews, keeping clear records, and making timely decisions that keep everything on track.

However, they’re also often the busiest part of your business. Without the right training and support, it’s easy for things to slip – issues can go unnoticed, processes may not be followed consistently, and key deadlines can quietly pass by.

That’s why investing in manager training now is so important. With the right knowledge and structure in place, your managers can become a real strength in reducing risk and ensuring your probation processes run smoothly.

Don’t forget your existing workforce

This isn’t just about new hires.

Any employee who reaches six months’ service by 1 January 2027 will gain unfair dismissal protection at that point.

That means:

  • Employees already in your business today may soon gain new rights
  • Performance issues should be addressed before the change comes in

Waiting until 2027 is simply too late.

Final thought: this is a shift in mindset

This isn’t just a legal change. It’s a fundamental shift in how UK businesses manage people. From 2027, hiring decisions need to be sharper, performance management needs to start earlier, and processes need to be consistent from day one.

The businesses that adapt now will be the ones that stay confident, compliant, and in control. That’s where SafeHR can help. With structured probation timelines, automated reminders, and clear documentation in one place, SafeHR gives you the tools and support to manage probation confidently and reduce risk as the rules change. Book a demo to see how you can stay ahead.

What should employers do now? A quick checklist

  • Review and shorten probation periods
  • Introduce structured review timelines
  • Train managers on early performance management
  • Set clear expectations from day one
  • Audit current employees approaching 6 months
  • Ensure documentation is consistent and thorough

If you’re unsure whether your current processes meet these standards, it may be time to review how you’re managing probation.

Need advice?

We’ve seen it all, and we’re here to help you handle it, quickly, confidently, and without the stress. Learn how we can help you by speaking to our team today.

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