Facing a disciplinary at work: the process and your rights

A disciplinary letter lands and your stomach drops. Whatever the allegation, the most important thing to know is this: a disciplinary is a process, not a verdict. Your employer has to follow that process fairly, and there are clear rules about what fair looks like. Employers who cut corners lose tribunals.

This guide walks through the whole process, what your employer must do at each stage, and the moves that protect your position. If the disciplinary grows out of a complaint you raised, our grievance at work guide covers how to get that on record properly.

What a disciplinary actually is

A disciplinary is your employer's formal process for dealing with a concern about your conduct or, sometimes, your performance. It can be triggered by anything from persistent lateness to a serious allegation like theft or bullying.

Two things matter from the start:

• Conduct cases are about something you are said to have done. The employer has to investigate the allegation and give you the chance to answer it.
• Capability or performance cases are about whether you can do the job. These should involve support, targets and time to improve before any warning.

If the allegation is serious, your employer may suspend you while they investigate. Suspension is supposed to be a neutral act, not a punishment, and it should almost always be on full pay. Our guide to being suspended from work covers that in detail.

The rules your employer has to follow

Every employer in Britain is expected to follow the ACAS Code of Practice on disciplinary and grievance procedures. It is not optional guidance that only big companies bother with. If your case ends up at an employment tribunal and your employer unreasonably failed to follow the Code, any compensation you win can be increased by up to 25%. The same uplift works in reverse if you unreasonably fail to follow it, for example by refusing to appeal.

A fair process has five stages:

• Investigation. Someone, ideally not the person who will run the hearing, gathers the facts: statements, documents, CCTV, messages. You do not have a right to attend investigation meetings, but you should be told an investigation is happening.
• Written invitation. You receive a letter setting out the allegation in enough detail to answer it, the possible outcomes (including dismissal if that is on the table), copies of the evidence, and the date of the hearing. You must be given reasonable time to prepare, usually at least a couple of working days.
• The hearing. The employer explains the case, you respond, ask questions and put forward your evidence. You have a legal right to be accompanied by a work colleague or a trade union representative.
• The decision. Given in writing, with reasons, as soon as possible after the hearing.
• Appeal. You must be offered the right to appeal any formal outcome, heard by someone more senior or at least someone not involved in the original decision.

Skip a stage, prejudge the outcome, or use the same person as investigator, judge and appeal panel, and the process starts to look unfair. An unfair process is what turns a defensible dismissal into an unfair one. Our guide to what counts as unfair dismissal explains the test tribunals apply and what a claim can be worth.

The possible outcomes

Not every disciplinary ends in a warning. The realistic outcomes are:

• No action. The allegation is not upheld. This should be confirmed in writing.
• First written warning. For misconduct or poor performance that is not serious enough for more.
• Final written warning. For serious misconduct, or further issues while a first warning is live. Usually stays live for 12 months. More on what that means in our final written warning guide.
• Dismissal. For gross misconduct, or further misconduct while a final warning is live. Even at this stage the process has to be fair.
• Other sanctions. Demotion or loss of a bonus, but only if your contract allows it.

What makes a disciplinary unfair

Tribunals ask two questions: did the employer genuinely believe the misconduct happened, on reasonable grounds, after a reasonable investigation, and did they follow a fair procedure with a sanction in the reasonable range? The common failures:

• No proper investigation, or one designed to confirm a decision already made
• Vague allegations you cannot realistically answer
• No evidence shared before the hearing
• No companion allowed, or the request refused
• The same person investigating and deciding, or an appeal heard by the original decision maker
• Disproportionate sanction, for example dismissal for a first minor offence
• Inconsistent treatment, where colleagues did the same thing without consequence

What to do right now

• Read the allegation letter carefully. The detail, or lack of it, tells you a lot about the strength of their case.
• Ask for the evidence. You are entitled to see what they rely on before the hearing.
• Use your companion. A colleague or union rep can take notes, confer with you and address the hearing.
• Prepare a written response. Calm, factual, point by point. If there is context, such as a practice everyone followed, put it in.
• Do not resign in the heat of the moment. Resigning and claiming constructive dismissal is much harder to win than defending the process.
• Appeal if the outcome is wrong. It keeps the ACAS uplift argument alive and employers do overturn decisions. If it does end in dismissal, keep an eye on the clock: tribunal time limits keep running while an internal appeal grinds on.
• Keep everything. Letters, emails, notes of meetings, names and dates.

If the allegation is one of gross misconduct, read our gross misconduct guide as well, because the stakes and the tactics are different. And if the process ends in dismissal, remember the qualifying period for ordinary unfair dismissal drops from two years to six months on 1 January 2027, which we explain in our qualifying period guide.

A disciplinary feels personal, but it is a legal process with rules. If yours is not following them, that is exactly when a short conversation with an employment solicitor pays for itself.