How to Write a Disciplinary Warning Letter, With Examples
A disciplinary warning letter should state what the employee did wrong, the evidence, what they said in response, the decision and the level of warning, how long it stays live, what happens if there is a repeat, the improvement expected and the right of appeal. Send it promptly after the disciplinary meeting, and keep it factual.
This post is a practical guide for small employers who need to write one, with example wording you can adapt.
There are two letters, not one
Most disciplinary processes need two letters. The first is the invitation to the disciplinary meeting. The second is the outcome letter, which confirms the decision and any warning. Both matter. A warning is hard to defend if the employee was never properly told what they were accused of, or if the outcome does not explain the reasoning.
The invitation letter
The Acas Code of Practice says the employee should be given enough information about the alleged misconduct and its possible consequences to be able to prepare. A good invitation includes:
The date, time and place of the meeting, and who will chair it
The allegations, set out specifically, with dates where possible
Copies of the evidence, such as the investigation report and witness statements
The possible outcomes, including dismissal if that is genuinely possible
The right to be accompanied by a trade union representative or work colleague
Reasonable notice, usually several working days
Example wording for the allegations:
It is alleged that on 14 September 2026 you left your shift at 2pm without permission and without telling your manager, contrary to the attendance and conduct policy. If this is found to be the case, it may be treated as misconduct.
Example wording for the possible outcomes:
At the meeting, the matter will be considered and a decision made on whether disciplinary action is appropriate. Possible outcomes range from no action to a written warning. In serious cases, dismissal is possible.
The outcome letter
The outcome letter should confirm, in this order:
The meeting date and who attended
The allegations considered
A short summary of the evidence and what the employee said, including any mitigation
Your findings on each allegation, and the reasons
The decision, and the level of warning, if any
How long the warning stays on file
The improvement expected
What could happen if there is a repeat
The right to appeal, to whom, how and by when
Example wording for the decision:
Having considered the evidence and your explanation, I have decided that it is more likely than not that you left your shift without permission. I have taken into account the difficulties you described, and your clean record. I have therefore decided to issue you with a first written warning, which will remain on your file for six months.
Example wording for expectations and consequences:
You are expected to follow the attendance policy and to seek permission before leaving work. Any further misconduct during the period of this warning may lead to further disciplinary action, up to and including a final written warning or dismissal.
Example wording for the right of appeal:
You have the right to appeal against this decision. Please write to [name] within [five] working days of receiving this letter, setting out your grounds. The appeal will be heard by someone who has not been involved in this case.
What level of warning?
Policies vary, but a common ladder is:
Informal conversation or note for minor issues
First written warning, usually live for six to twelve months
Final written warning, usually live for twelve months or longer
Dismissal, if there is a further breach or in a case of gross misconduct
Follow what your own policy says, and apply it consistently. Skipping stages is possible for serious misconduct, but needs to be justified.
Tips for writing a good letter
Stick to facts. Describe what happened, not your opinion of the person. Avoid words like lazy, rude or attitude.
One allegation, one finding. Deal with each separately.
Say what you considered. Show you listened, especially to mitigation.
Be consistent. Compare to how similar cases have been dealt with.
Be clear about duration and consequences. Vague warnings are hard to rely on later.
Keep it calm. The letter may be read by a tribunal.
Send it promptly, and keep a copy and proof of delivery.
Common mistakes
A letter that says only that a warning has been issued, with no reasoning
Allegations that differ between the invitation and the outcome
Issuing a warning for something the employee was never asked about
No mention of appeal rights
A warning that has expired being relied on later