The UK Disciplinary Procedure, as a Flowchart
The five steps of a fair, ACAS-aligned disciplinary process — in the order a tribunal expects to see them.
In most lost tribunal cases the employer had a fair reason and an unfair process. Follow the steps below in order, write everything down, and the process will hold.
Before the flowchart: is this formal territory at all?
For minor, first-time issues, a quiet informal conversation fixes most problems and burns no goodwill. Start the formal procedure below when the matter is serious enough to warrant a warning, or when informal conversations haven't worked. If you're unsure which side of that line you're on, that's a five-minute HR Advice Line question.
1. Investigate first, decide nothing
Establish the facts before any allegation is put. An investigation meeting is not a disciplinary hearing.
Gather the evidence while it is fresh: statements, documents, CCTV, system logs. Where practical, someone different should investigate and hear the case. Suspension is not a default — it needs a genuine reason (risk to people, evidence or the business), should be on full pay, and kept as brief as possible.
Where it goes wrong: Deciding the outcome before the process starts. Tribunals spot pre-judgement instantly.
2. Put it in writing
Tell the employee what is alleged, share the evidence, and warn them of the possible outcomes.
The invitation letter should set out the specific allegations, include copies of the evidence, state that the meeting is a formal disciplinary hearing, flag the possible sanctions (including dismissal, if it could go that far), and confirm the right to be accompanied. Give reasonable notice — enough time to prepare, typically at least 48 hours.
Where it goes wrong: Vague allegations. "Poor attitude" is not something anyone can answer; a dated incident is.
3. Hold the hearing
Put the evidence, listen properly, and let them bring a companion.
Go through each allegation, present the evidence, and give the employee a genuine chance to respond, question it and call their own evidence. They have a statutory right to be accompanied by a colleague or trade union representative — our guide to who can accompany an employee to a disciplinary meeting covers exactly what the companion can and cannot do. Take minutes. Adjourn before deciding — even 24 hours shows the decision followed the hearing rather than preceded it.
Where it goes wrong: Refusing a reasonable request to be accompanied, or steamrolling the meeting to a preset outcome.
4. Decide and communicate the outcome
No action, first written warning, final written warning, or dismissal — proportionate to the findings.
The sanction should fit the severity and the employee's record: informal advice or no action, a first written warning, a final written warning, or dismissal with notice. Dismissal without notice is reserved for gross misconduct, and even then only after a fair process. Confirm the outcome in writing, with the reasons, how long any warning stays live, and the right of appeal.
Where it goes wrong: Inconsistency. If the last person who did the same thing got a warning, dismissing this one needs a very good reason.
5. Offer an appeal, heard impartially
The appeal should go to someone not involved in the original decision.
The employee should be told how to appeal and given a reasonable window (five working days is common). The appeal should be heard, wherever possible, by someone senior who was not involved in the investigation or the hearing. In a small business that person often does not exist internally — which is exactly what our Independent Appeals service is for: an external, impartial appeal that holds up to scrutiny.
Where it goes wrong: The same manager hearing their own appeal. It renders the appeal meaningless and tribunals treat it that way.
Done properly, the file tells the story
At the end of a fair process you should be able to hand over a folder: the investigation notes, the invitation letter, the evidence, the hearing minutes, the outcome letter and the appeal record. If that folder exists, you followed the flowchart. If it doesn't, no amount of having been right will help.
Disciplinary procedure FAQs
Do I have to follow the ACAS Code of Practice?
The ACAS Code is not law in itself, but tribunals must take it into account, and an unreasonable failure to follow it can increase compensation by up to 25%. For any dismissal to be fair, the process behind it needs to reflect the Code's steps: investigation, written notice, hearing, outcome, appeal.
Can I skip straight to a warning for something minor?
For genuinely minor issues, an informal conversation is usually the right first step, and often the last one needed. The formal procedure is for matters serious enough to justify a warning or more, or where informal attempts have not worked.
Who can accompany an employee to a disciplinary hearing?
A colleague or a trade union representative — that is the statutory right. The companion can put the employee's case, sum up and confer, but cannot answer questions on the employee's behalf. Friends and family are not part of the statutory right, though some employers allow them by policy.
What is the difference between misconduct and gross misconduct?
Misconduct is behaviour that breaches your rules but warrants a warning first, such as persistent lateness. Gross misconduct is behaviour serious enough to destroy the employment relationship in one go, such as theft, violence or serious safety breaches, and can justify dismissal without notice, but only after a fair process.
How long does a disciplinary warning stay on file?
Whatever your policy says, typically 6 months for a first written warning and 12 months for a final written warning. Once spent, a warning should not normally be relied on for future sanctions.
Related reading and help
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