Employment Law2026-10-22

Writing a Valid Warning Letter: The Three Elements Without Which It Counts for Nothing

A formal warning is the step that comes before a conduct-based dismissal. If it lacks the specific allegation, the reprimand or the warning of consequences, it will carry no weight later. What you as an employer must put in it, and what you must leave out.

An employee is repeatedly late, ignores an instruction or fails to report in sick. You as the employer are not prepared to let it pass, but you do not want to dismiss them outright either. The right tool is the formal warning letter. It is more than a letter written in anger: before an employment tribunal, it is what later decides whether a conduct-based dismissal stands up. A warning letter that is missing one of its elements is worth nothing there, and one that contains too much has to be taken out of the personnel file.

In short

A valid warning letter has three elements. It describes the incident specifically, with the date and what happened, and names the duty that was breached (the notice function). It expresses disapproval of the conduct and calls for the employee to behave in line with the contract in future (the reprimand function). And it warns that, should the conduct be repeated, the continued existence of the employment relationship is at risk — in other words, dismissal (the warning function). Without the warning of consequences, it is merely a caution. Without a specific allegation, the employee can demand its removal from the personnel file. There is no requirement to hear the employee first in a private business, though it is advisable. The works council does not need to be involved in a warning letter.

The legal position

Why the warning letter underpins the dismissal. A dismissal for misconduct is only justified under section 1(2) of the Dismissal Protection Act (KSchG) if it is prompted by reasons rooted in the employee’s conduct. The Federal Labour Court derives the following from the principle of proportionality, which is also expressed in section 314(2) of the Civil Code (BGB): where the breach of duty stems from conduct the employee can control, it is to be assumed that the mere threat of consequences for the employment relationship will influence their future behaviour. Both ordinary and extraordinary dismissals therefore normally require a prior warning letter. It is dispensable only where it is clear from the outset that no change in conduct is to be expected even after a warning, or where the breach of duty is so serious that tolerating it is plainly out of the question — and plainly so to the employee as well. In everyday terms, this means that without a warning letter a conduct-based dismissal will almost always fail. In a small business not covered by the Dismissal Protection Act you do not need a warning letter for an ordinary dismissal; but for a summary dismissal under section 626 BGB, the principle of proportionality applies there too.

The first element: the specific allegation. Write down what happened and when: “On 14 October 2026 you started work at 9.40 a.m. rather than 8.00 a.m., without notifying anyone beforehand.” Add the duty that was breached — for instance the contractually agreed working hours, or section 5(1) of the Continued Remuneration Act (EFZG) for reporting an inability to work. Sweeping phrases such as “repeatedly unpunctual” or “poor work performance” will not do. The employee must be able to identify which conduct is meant, and the tribunal must later be able to examine whether the allegation holds true. Each incident gets its own warning letter. If you bundle several allegations into one document and one of them turns out to be unfounded, then under the case law of the Federal Labour Court the entire warning letter must be removed from the personnel file — including the parts that were accurate.

The second element: the reprimand. State clearly that you will not accept the conduct and that you expect the employee to behave in accordance with the contract in future. A measured tone is enough. Insults, speculation about motives or judgements about the person have no place in it; they lay the warning letter open to challenge.

The third element: the warning of consequences. The warning letter must announce that a repetition would put the continued existence of the employment relationship at risk. The usual wording is: “Should this occur again, you must expect to be dismissed.” If that sentence is absent, or watered down (“we reserve the right to take measures”), what you have is a caution. It documents the incident, but it will not support a dismissal.

Form and authority. The law does not require written form; a verbal warning is valid. But it is almost impossible to prove, which is why it belongs on paper, with a date and the signature of someone who has authority to give the employee instructions: the owner, a managing director, the head of HR or the employee’s direct line manager. Have receipt acknowledged, or have delivery confirmed by a witness. The warning letter goes into the personnel file.

Hearing the employee, counter-statement, works council. There is no duty to hear the employee before issuing a warning letter in a private business; some collective agreements do provide for one. A short conversation is nevertheless worthwhile: it clarifies the facts before you put something inaccurate on record. Under section 83(2) of the Works Constitution Act (BetrVG) the employee may add a counter-statement to the personnel file, and you must allow this. The works council does not have to be involved in a warning letter, unlike with a dismissal (section 102 BetrVG).

Using it up, and its fading force. Whoever issues a warning letter for an incident thereby gives up the right to dismiss over that very incident. The warning letter is the milder response; dismissal comes only on the next occasion. There is no fixed expiry period. If the warning letter dates back years and the employee has done nothing wrong since, it loses its warning function. The Federal Labour Court describes the warning letter as the exercise of your rights as a creditor in a twofold sense: you point out to the employee their duties and the breach of those duties, and you call on them to behave in line with the contract in future, coupled with the announcement of consequences. You only have to remove a properly issued warning letter from the personnel file once the conduct complained of has become entirely meaningless for the employment relationship in every respect; even a warning letter that has lost its warning function may still carry weight in the balancing of interests for a later dismissal (Federal Labour Court, judgment of 19 July 2012, 2 AZR 782/11, bundesarbeitsgericht.de). Conversely, a long string of warning letters with no consequences devalues the warning: whoever threatens dismissal for the fifth time must make it especially clear on that fifth occasion that this time it is serious.

Time limits

There is no statutory time limit for a warning letter. It should nonetheless be issued promptly — within a few weeks of the incident, or of your becoming aware of it. Waiting for months signals that the conduct cannot have been that serious. The two-week period under section 626(2) BGB applies only to summary dismissal, not to the warning letter. For the later dismissal, the following applies: the new incident must be of the same kind. Someone who has been warned for lateness and later ignores an instruction has not been put on relevant notice; the dismissal then needs a fresh warning letter, or a breach of duty that is serious enough in its own right. The employee, for their part, has no time limit for challenging a warning letter; they can demand its removal at any time, including only later, in the unfair-dismissal proceedings.

How to proceed

Secure the facts. Date, time, those involved, witnesses, evidence such as time records or emails. Whatever you fail to record now will be missing later before the tribunal.
Hold a conversation. Brief, measured, with a note of what was said. There may be an explanation that disproves the allegation.
Name the duty. Which rule was breached: the employment contract, a work instruction, a statute. This is the sentence that gives the allegation its weight.
Draft the letter. One incident, three elements, one page. Measured, with no adjectives.
Have the right person sign it and document delivery.
File it and keep watch. The warning letter goes into the personnel file; add any counter-statement that comes in. On the next breach of the same kind, the dismissal is ready to go.

Example

A service business with twenty employees has a member of staff who arrives between 30 and 90 minutes late on three days within a fortnight. The time records prove it. The managing director raises it with him; there is no plausible explanation. He issues a written warning letter, naming the three days with the times, referring to the contractual starting time of 8.00 a.m., calling on him to keep to his hours in future, and warning him of dismissal should it happen again. The employee acknowledges receipt. Six weeks later he is once more an hour late with no apology. Now the managing director can dismiss him by ordinary notice; the warning letter is relevant, prompt and formally complete. Had he instead written “Your lateness over the past few weeks is unacceptable”, the allegation would have been too vague. Had he left out the warning of dismissal, it would have remained a mere caution.

Common mistakes

The catch-all warning. Five allegations in one letter. If one is wrong, the whole letter falls.
No warning of dismissal. Then it is a caution, and the next dismissal arrives with no prior warning behind it.
Vague allegations. “Lack of motivation” or “a poor working atmosphere” is not an incident, it is an impression.
A warning letter and a dismissal for the same incident. Whoever issues a warning has made their choice over that incident. The right to dismiss for it has been used up.
Waiting too long, or stacking up so many warning letters that none of them is taken seriously any more.
Signed by the wrong person. A colleague with no authority to give instructions cannot issue a warning.
Warning over trivialities. Whoever issues a warning over a return from a break that was two minutes late loses on proportionality before the tribunal — and loses respect within the business.

Frequently asked questions

How many warning letters do I need before a dismissal?

The law gives no number. One relevant, formally complete warning letter is enough, provided a breach of the same kind follows it. For minor breaches the tribunals tend to expect several warning letters; for serious ones a single warning suffices; for very serious breaches it is dispensable altogether.

Does the employee have to sign the warning letter?

No. Their signature only confirms receipt, not that the contents are correct. If they refuse to sign, have delivery confirmed by a witness. The warning letter is valid even without their signature.

Do I have to consult the works council before issuing a warning letter?

No. The Works Constitution Act provides for no involvement in the case of a warning letter; the duty to consult under section 102 BetrVG applies to dismissals.

Can the employee bring a claim against the warning letter?

Yes. They can bring a claim for its removal from the personnel file if the warning letter contains incorrect facts, is too imprecise or breaches the principle of proportionality. But they can also simply let it stand and challenge it only later, in the unfair-dismissal proceedings, where it is then examined as a preliminary matter.

May I issue a warning verbally?

Yes, a verbal warning is valid. In a dispute, however, you have to prove what was said, with what allegation and with what warning of consequences. Without a document, that rarely succeeds.

Your next step

The warning letter is the document on which a later dismissal rests. It is worth drafting it so that it can bear that weight: one incident, three elements, the right signature, documented delivery. I draft warning letters for businesses, review existing ones to see whether they will hold up, and prepare the dismissal on that basis — nationwide, by video or by telephone. You can read how I represent employers in employment law on my practice-area page. Tell me what has happened; I will tell you whether a warning letter is the right tool, and draft it for you.

This article provides general information and is no substitute for legal advice in an individual case. Last updated: 2026-10-22.

Christian Czirnich, Rechtsanwalt (attorney at law), Kirchseeon near Munich

Tell me what happened and I will draft the warning letter.

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