Conduct and discipline

First written warning letter

Confirms the outcome of a disciplinary hearing as a first written warning, its duration and what happens if it recurs.

The hearing found the allegation proven, it is misconduct rather than gross misconduct, and it is the first formal step. The warning must say what was decided, why, how long it lasts, what improvement is needed, and what the next step would be.

Before it goes

  • The hearing has been held and the employee heard.
  • You have considered any mitigation they raised and any live warnings on file.
  • Your procedure says how long a first written warning stays live (six or twelve months is usual).

The letter

[COMPANY NAME] [COMPANY ADDRESS] [DATE] [EMPLOYEE NAME] [EMPLOYEE ADDRESS] Dear [EMPLOYEE FIRST NAME], Outcome of disciplinary hearing: first written warning I am writing to confirm the outcome of the disciplinary hearing held on [HEARING DATE], chaired by me, at which you were accompanied by [COMPANION NAME / at which you chose not to be accompanied]. The allegation considered was: [ALLEGATION, as stated in the invitation letter.] Having considered the evidence and your response, in particular [WHAT THEY SAID IN MITIGATION], I have concluded that the allegation is upheld, because [ONE OR TWO SENTENCES OF REASONING, e.g. the clock-in record and the site sign-in sheet both show you left at 12:40 and did not return, and you accepted at the hearing that you had not told your supervisor]. I have decided that the appropriate outcome is a first written warning. In reaching that decision I have taken into account [your clean record to date / your acknowledgement of the issue / the impact on the team on the day]. This warning will remain live on your file for [6 / 12] months from the date of this letter, until [EXPIRY DATE], after which it will be disregarded for disciplinary purposes. The improvement required is [WHAT MUST CHANGE, e.g. that you do not leave site during working hours without your supervisor's agreement, and that you follow the attendance procedure in full]. If there is further misconduct while this warning is live, it may result in further disciplinary action up to and including a final written warning. [SUPPORT OFFERED, if any.] You have the right to appeal against this decision. If you wish to appeal, write to [APPEAL MANAGER NAME] at [ADDRESS / EMAIL] within five working days of receiving this letter, setting out your grounds of appeal. A copy of this letter will be kept on your personnel file. Yours sincerely, [MANAGER NAME] [JOB TITLE] [COMPANY NAME]

Filling it in

Reasoning
Two sentences that connect the evidence to the finding. The reader should be able to see why you decided, not only what.
Live period
Whatever your procedure says. Six months for a first warning is common; twelve is defensible. Do not invent a new period for this case.
Consequences
Name the next step. A warning that does not say what happens next is not a warning.

What the law says

  • Acas Code of Practice, paragraphs 18 to 21: the warning should set out the nature of the misconduct, the change in behaviour required, the period it remains live, and the consequences of further misconduct; and confirm the right of appeal.
  • Acas Code of Practice on disciplinary and grievance procedures: a tribunal can adjust compensation by up to 25% for an unreasonable failure to follow it.
Guidance, not legal advice. Employment law moves; check the current position before relying on any of it, and take advice on anything that could end someone's employment.

What turns this letter into a claim

  • Do not rely on an expired warning when deciding a later sanction. Once it has lapsed, it has lapsed.
  • Do not skip a step because you are cross. If the procedure has a first warning, and this is a first offence of ordinary misconduct, it is a first warning.

Questions people ask

Can I go straight to a final written warning for a first offence?

For misconduct serious enough to justify it, yes, and your procedure should say so. The invitation letter must have flagged that outcome as possible. For ordinary misconduct on a clean record, the first step is the first step.

Does the employee have to sign the warning?

No. Ask them to sign to acknowledge receipt if you like, but a refusal changes nothing. Send it by a method you can prove, and keep a copy.

The letter, with the names already in

Employ AI drafts letters like this one from the employee's record, so the dates, service and pay are already right, and the disciplinary module writes the invitation and outcome letters from the case itself. All 44 letter families, 49 UK policies, GPS clock-in, rotas, leave and timesheets: £2.50 a month plus £1 per employee. 14 days free, no card.

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