A verhaltensbedingte Kündigung — behavioural dismissal — punishes alleged misconduct: lateness, refusal of instructions, insults, private internet use, unauthorised side jobs. It is the dismissal type where employers must build a genuine case file, step by step, before the notice can hold up in court. The single most common reason behavioural dismissals fail is the warning requirement: without a prior, formally correct Abmahnung covering the same category of conduct, the dismissal is usually invalid — and even with one, the employer still has to clear proportionality, proof and interest-weighing hurdles that are higher than most HR departments assume.
The Abmahnung requirement
For conduct that can be corrected, dismissal must be preceded by a formal warning — an Abmahnung that (1) describes the specific incident with date and facts, (2) demands concrete future conduct, and (3) explicitly threatens consequences for the employment relationship in case of repetition. The logic: dismissal is the last resort (ultima ratio); the employee must first get a real chance to change course.
A defective warning does not count. Typical defects: vague descriptions (“repeated unacceptable behaviour”), missing threat of consequences, bundling several accusations of which one is untrue (which can invalidate the whole Abmahnung), or warnings so old and stale that they have lost their warning function. Equally important: a warning consumes the incident it covers — the employer cannot warn you for an event and later dismiss you for that same event.
Exceptions: when no warning is needed
The warning requirement falls away only where it would be pointless: breaches so severe that the employee could not possibly expect tolerance (theft, violence, gross sexual harassment, serious working-time fraud), or where the employee has made unmistakably clear that the conduct will continue regardless. Employers regularly overestimate this exception — courts apply it narrowly.
The same-category requirement
The prior warning must concern conduct of the same category as the dismissal ground (Gleichartigkeit). A warning for late arrival does not prepare a dismissal for private internet use; a warning about expense-report sloppiness does not prepare a dismissal for an argument with a colleague. The comparison is functional — both incidents must breach the same type of duty, so that the employee was genuinely on notice. In practice we regularly defeat dismissals where the employer’s file contains warnings, but none in the right category.
Proportionality and ultima ratio
Even a warned, proven breach justifies dismissal only if no milder measure would do: a further warning, a transfer, a differently organised workflow. The court then conducts the Interessenabwägung — weighing seniority, prior clean record, degree of fault, provocation by the employer’s side, family circumstances, labour-market prospects. A 15-year employee with one warning and a moderate second lapse is a very different case from a serial offender in year two. Behavioural dismissal is never a mechanical “two strikes” system, however often HR presents it that way.
Typical grounds — and their weak points
- Repeated lateness: viable in principle after relevant warnings — but the employer must prove each instance and show actual operational impact; tolerated flexitime cultures undermine the case.
- Refusal to follow instructions: only counts if the instruction was lawful and within the contract. An instruction that itself violates the contract, working-time law or fair-discretion standards (§ 106 GewO) may be refused — then the “refusal” is no breach at all.
- Insults and conflicts: gravity, context and provocation matter; a heated remark in a stressful exchange is treated differently from targeted degradation. Statements in confidential small-group chats have, in recent case law, sometimes — but not always — enjoyed protection.
- Private internet and phone use: depends heavily on what was permitted or tolerated. Where the employer never enforced a clear rule, dismissal without warning rarely stands.
- Unauthorised side jobs: side employment is in principle lawful; it becomes a breach mainly where it impairs performance, competes with the employer, or violates working-time limits — a blanket “no side jobs” clause is often unenforceable.
- Sick-note abuse: announcing illness after a refused holiday or demonstrably working elsewhere while off sick are serious — but the employer needs solid proof, not suspicion.
Common employer mistakes
- No warning, or a warning in the wrong category — the classic, case-ending defect.
- Defective warnings — vague, bundled, partially untrue, or missing the threat of consequences.
- Stale or consumed incidents — dismissing for events long tolerated or already covered by a warning.
- Skipping the works council — where a Betriebsrat exists, defective consultation under § 102 BetrVG voids the dismissal regardless of the conduct.
- Overcharging the facts — framing a minor lapse as “working-time fraud” or “theft” to dodge the warning requirement; courts see through relabelling.
- Proof by assertion — no witnesses, no documents, only a supervisor’s summary written weeks later.
Evidence: the employer must prove everything
In the Kündigungsschutz process, the employer carries the full burden of proof for the misconduct, the warnings, the futility of milder means and the interest weighing. Hearsay, anonymous complaints and covert surveillance are problem zones: evidence gathered in violation of data-protection rules (for instance disproportionate video monitoring or sweeping searches of private folders) can be unusable in court. Meanwhile the employee need not prove innocence — targeted denial forces the employer to substantiate every element. This asymmetry is why so many behavioural dismissals soften dramatically once litigation begins.
Settlement dynamics
Behavioural cases settle differently from operational ones. The employer faces accumulating risks: back-pay exposure for the litigation period, the difficulty of proving conduct through witnesses who may waver, and — often decisive — the reputational discomfort of airing internal conflicts in a public hearing. The employee, in turn, often has little desire to return to a poisoned environment. The typical outcome is an exit package: severance (frequently at or above the customary 0.5 monthly salaries per year where the warning history is weak), a clean agreed reference, deletion of warnings from the file, and Sperrzeit-protective wording. The strength of the Abmahnung file is the single biggest driver of the multiple — which is why our first request in every behavioural case is the complete personnel file.
Worked example
IT support specialist in Berlin, gross salary €4,800 per month, 5 years of service. After a conflict with a new team lead, he receives an Abmahnung for “uncooperative behaviour” (no date, no specific incident described). Four months later he declines to take over weekend on-call duty at 48 hours’ notice, citing childcare; two weeks after that, the employer dismisses him ordinarily on behavioural grounds — “persistent refusal to work, previously warned”.
We file the Kündigungsschutzklage on day 8. The defects: the Abmahnung is too vague to have warning effect and concerns a different category (general demeanour vs. refusal of an assignment); the on-call instruction itself was questionable under § 106 GewO given the notice period and his family obligations; and the works-council consultation letter mentioned only “repeated problems with superiors” — far short of the required specificity.
Settlement at the Gütetermin: termination recast as an ordinary employer-side dismissal for operational reasons at the correct notice date, severance of 0.9 monthly salaries per year of service (~€21,600), removal of the Abmahnung from the personnel file, a Grade-2 reference, garden leave through the two-month notice period (€9,600) — and no Sperrzeit. The employer’s opening position had been zero severance “because of the warning”.
Frequently asked questions
How many Abmahnungen are required before dismissal?
There is no fixed number. One formally correct, same-category warning can suffice for a further significant breach; for minor infractions courts may expect more than one. The quality and relevance of the warning matter far more than the count.
Should I object to an Abmahnung immediately?
You can demand removal of an unjustified warning and add a counter-statement to your file, but there is no deadline — and tactically it is sometimes better to keep the powder dry and attack the warning’s defects later, inside the dismissal case. Take advice before reacting; see what is an Abmahnung.
The accusation is simply false. Do I have to disprove it?
No. The employer must prove the misconduct to the court’s satisfaction. Your task is a precise, consistent denial and preservation of your own evidence (emails, chat logs, witnesses). Avoid explanatory statements to HR before legal advice.
Can I be dismissed for behaviour outside work?
Only exceptionally — private conduct is generally protected unless it damages the employment relationship concretely (for example, offences against the employer, or conduct destroying the specific trust required for the role). Blanket “reputation” arguments usually fail.
What deadline applies to challenging the dismissal?
Three weeks from receipt of the written notice (§ 4 KSchG), or the dismissal becomes valid by operation of law — regardless of how weak the grounds were. Details in our guide to the three-week deadline.