Managing Poor Work Performance in the UK: A Guide for Employers

Poor work performance can be one of the most frustrating (and time-consuming) issues you’ll deal with as a small business owner.

You’ve got work to deliver, customers to keep happy, and a team that needs to pull in the same direction. When one person isn’t meeting expectations, it doesn’t just affect output - it can drag down morale, create tension, and quietly increase risk for your business.

The good news is that you can manage poor work performance in a way that’s fair, structured and legally safer. The key is to treat it as a process, not a reaction - and to document what you’re doing as you go.

Below, we’ll walk you through a practical approach to managing poor work performance in the UK, including the steps to take, what to put in writing, and when performance becomes a disciplinary issue.

What Counts As Poor Work Performance (And Why It Matters Legally)

In simple terms, poor work performance is when an employee isn’t meeting the standards you can reasonably expect for their role.

That might look like:

• Consistently missing deadlines or failing to complete tasks
• Low quality work, repeated mistakes, or poor attention to detail
• Not following reasonable instructions or processes
• Not meeting sales or productivity targets (where targets are realistic and properly communicated)
• Poor customer service, complaints, or relationship issues that relate to competence (not misconduct)

It matters legally because if performance issues aren’t handled fairly, dismissals can become risky - especially once an employee has 2+ years’ continuous service (when they can usually bring an unfair dismissal claim).

Even before you get to dismissal, performance problems often overlap with other legal risk areas, including:

• Disability and health (Equality Act 2010) - performance may be linked to a medical condition and trigger a duty to consider reasonable adjustments
• Stress and wellbeing - if workload and expectations aren’t managed properly
• Discrimination - if you treat performance issues inconsistently between employees
• Contract disputes - where KPIs, duties or reporting lines are unclear

That’s why it’s worth getting your basics right early - starting with clear role expectations and a solid Employment Contract.

Step 1: Set Clear Standards Before You Start Any Performance Process

Before you can manage poor work performance, you need to be confident that your expectations are clear, reasonable, and consistently applied.

If you’re thinking “but it’s obvious what the job is”, it’s worth pausing. In practice, performance disputes often happen because:

• the role has changed over time but the paperwork didn’t
• targets were introduced informally, without consultation or training
• different managers give different instructions
• the employee says they were never told a task was required (or how to do it)

What To Check First

Before starting a formal process, it’s sensible to check:

• Job description: is it accurate and up to date?
• Training: have they been trained on the processes you’re measuring them against?
• Resources: do they have the tools and time needed to do the job?
• Workload: are you expecting too much for the hours and seniority?
• Probation: are they still in probation and do you have a probation clause you can rely on?

If the employee is new (or newly promoted), a well-run Probation Period can give you a clear framework to set expectations and address issues early.

Practical tip: don’t wait until you’re “fed up” to raise concerns. The earlier you raise performance issues, the easier they are to fix - and the stronger your paper trail will be if things don’t improve.

Step 2: Have An Informal Performance Conversation First (And Document It)

In many small businesses, the best first step is an informal conversation. This doesn’t need to be scary or overly legalistic - it’s simply a structured check-in where you explain what’s not meeting expectations and what “good” looks like.

Done properly, informal management can solve most performance issues without escalating things further.

How To Run The Conversation

Keep it simple and factual:

• Explain the specific performance issue (with examples)
• Explain the impact (on customers, deadlines, other team members)
• Ask if anything is contributing to the issue (training gaps, unclear instructions, personal issues, health)
• Agree on clear actions and a review date

After the conversation, send a short follow-up email confirming what you discussed. This is one of the easiest ways to build a reliable record without making things adversarial.

When You Should Do Fact-Finding

Sometimes, what looks like poor work performance is actually a bigger issue - for example, the employee says they weren’t trained, systems are failing, or there are conflicting instructions.

If you need to clarify what’s happened before deciding the next step, it can help to hold a Fact-Finding Meeting and document the outcome.

This is especially useful where performance concerns overlap with conduct concerns (for example, someone claims they “didn’t know” a process, but there’s evidence they deliberately ignored it).

Step 3: Use A Performance Improvement Plan (PIP) The Right Way

If informal management hasn’t worked (or the performance issues are more serious), the next step is often a structured Performance Improvement Plan (PIP).

A PIP should not be a “paper exercise” designed to push someone out. Tribunals tend to look more favourably on processes where you gave the employee a real chance to improve, supported them, and measured progress fairly.

A good PIP is practical. It creates clarity for everyone - and it protects your business if you later need to take formal action.

Many employers find it helpful to align this with best practice guidance on Performance Improvement Plans.

What To Include In A PIP

While every business is different, a solid PIP often includes:

• The performance concerns (specific examples and dates)
• The standards expected (what acceptable performance looks like)
• Support measures (training, mentoring, adjusted duties, clearer supervision)
• Timescales (commonly 4–12 weeks depending on the role and issue)
• Review points (weekly or fortnightly check-ins)
• How improvement will be measured (KPIs, error rate, customer feedback, completed tasks)
• Consequences if performance doesn’t improve (for example, moving to a formal capability process)

Be Careful With Targets And KPIs

Targets should be realistic and within the employee’s control. If a target depends on market conditions or lead quality, think carefully about how you measure performance fairly.

If you’re introducing new targets that aren’t in the contract, you may need to consult and document the change. If you push changes unreasonably, you can end up with employee relations issues - and sometimes legal claims - that are bigger than the performance issue you started with.

Step 4: When Poor Performance Becomes A Formal Capability Process

If the employee doesn’t improve during the PIP (or if the issues are too serious to stay informal), you may need to move to a formal capability process.

In most cases, poor work performance is handled under capability (not misconduct). Capability relates to skill, competence and ability to do the job.

Practically, a fair capability process usually involves:

• inviting the employee to a formal meeting
• setting out the concerns and the evidence
• giving the employee a chance to respond
• agreeing next steps (further support, extending the PIP, issuing a warning)
• reviewing progress and escalating only if necessary

If you’re unsure how this differs from discipline, it can help to ground your approach in a clear Capability Procedure so you’re not mixing processes (and creating procedural risk).

Inviting The Employee To A Meeting

Invite the employee in writing and give enough detail so they understand what the meeting is about. If it’s a formal meeting, you’ll usually want to explain:

• the performance concerns being discussed
• possible outcomes (for example, a warning)
• that they can ask to be accompanied at certain formal meetings under UK law (and you should also check what your own policies say)

Many employers keep their invitations consistent using a standard template that fits the type of process you’re running (capability rather than misconduct), and includes the right information about the meeting.

Warnings And Timescales

Capability processes often involve warnings if performance doesn’t improve. Common stages are:

• first written warning
• final written warning
• dismissal (as a last resort)

What matters is not the label, but that the employee understands the seriousness, what they need to do to improve, and what happens if they don’t.

Also think about how long warnings remain “live” in your business. This should be consistent and ideally aligned with your policies. If you’re issuing a Final Written Warning, it’s particularly important that the evidence, expectations and review timeline are clear.

Don’t Forget Health And Reasonable Adjustments

If the employee raises a medical issue (or you suspect one), pause and assess before pushing forward.

In some situations, poor work performance is connected to:

• stress, burnout or anxiety
• neurodiversity (for example, ADHD or autism)
• long-term physical conditions
• medication side effects

If the condition meets the legal definition of a disability, you may have a duty to consider reasonable adjustments. That might include changes to working arrangements, support, training, or modifying how tasks are allocated.

This is an area where tailored advice can really help, because getting it wrong can quickly move the issue from “performance management” into “discrimination risk”.

Step 5: When Poor Performance Crosses Into Misconduct (And What To Do)

Sometimes you’ll be dealing with poor work performance - but there’s also a conduct issue running alongside it.

For example:

• an employee refuses to follow reasonable instructions
• they’re careless with confidential information
• they’re deliberately not doing the work
• they’re falsifying records, timesheets or results

In those situations, you may be looking at misconduct rather than capability.

This distinction matters because misconduct is typically handled through a disciplinary process, and serious misconduct can sometimes justify dismissal more quickly (though a fair process is still important, and often required, to reduce legal risk).

If the behaviour is serious, it’s worth checking whether you’re approaching Gross Misconduct territory, and ensuring your investigation and procedure are solid before you make decisions.

Avoid The Common Trap: “We’ll Call It Performance”

Some employers try to avoid conflict by labelling everything as performance. But if the real issue is conduct, taking a capability route can create confusion and weaken your position later.

On the flip side, if the real issue is capability and you treat it like misconduct, you can end up with an unfair process (and unnecessary escalation).

If you’re not sure which it is, that’s usually a sign you should slow down, gather facts, and get advice on the safest pathway.

Key Takeaways

• Poor work performance should be managed as a structured process - not a reaction in the heat of the moment.
• Start by ensuring expectations are clear, reasonable and documented, ideally through a strong Employment Contract and up-to-date role information.
• Use an informal performance conversation early, and follow up in writing to create a clear record.
• A well-run Performance Improvement Plan (PIP) can fix issues quickly and show you’ve given genuine support and opportunity to improve.
• If performance doesn’t improve, consider a fair capability process with meetings, evidence, and proportionate warnings.
• Watch for overlap with health and disability issues, as this can trigger duties around reasonable adjustments and increase legal risk if mishandled.
• If the issue is actually misconduct (not capability), use the correct disciplinary route and make sure your investigation is thorough.

If you’d like help managing poor work performance in a way that protects your business - including performance plans, capability procedures, warnings, or a compliant exit process - you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.