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A warning letter explained simply

Definition

A written warning is a formal notice issued by the employer. It specifies a particular instance of misconduct, declares it to be unacceptable and threatens dismissal should it be repeated. Dismissal on grounds of conduct is generally invalid without a prior written warning. The employee may object – their counterstatement will then be included in the personnel file. Unjustified or outdated warnings must be removed from the personnel file upon request.

Dr Nils Bronhofer

Specialist solicitor in employment law
Over 15 years’ experience in employment law

Reading time:  minutes • Last updated: January 2026

Classification under employment law

A written warning is the ‘yellow card’ of employment law. The employer reprimands the employee for specific misconduct and threatens dismissal in the event of a repeat offence. Without a prior written warning, dismissal on grounds of conduct is generally invalid.


Distinction from related terms

Admonition: An admonition is a non-binding reprimand with no legal consequences. A written warning, on the other hand, serves as a clear warning and may form the basis for further action under employment law. 

Warning: The term ‘warning’ is often used colloquially as a synonym, but is not clearly defined in legal terms. A formal warning, on the other hand, is a well-established term in employment law with a clear function.

Practical tip

Never sign a warning letter with the words “I agree”. Check the facts carefully – you can refute an incorrect warning letter by submitting a counterstatement or request that it be removed from your personnel file. Although there are no specific deadlines, you should act promptly.

A warning letter is invalid if the conduct is not described in specific terms or if it does not serve as a clear warning. Warning letters that are disproportionate or manifestly unjustified are also open to challenge.

A direct response is not strictly necessary. In many cases, however, it may be advisable to submit a counterstatement for the personnel file or to have the warning letter reviewed by a solicitor specialising in such matters.

Yes, if the behaviour for which the warning was issued is repeated. The warning is specifically intended to pave the way for a subsequent dismissal on disciplinary grounds.

Yes, if it is unfounded or contains procedural errors. In that case, you are entitled to have it removed from your personnel file.

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