If the employer accidentally transfers more salary, the employee is obliged to pay it back. As a rule, the excess salary is paid back in the form of a transfer or offset against the next salary.
However, in some cases the employee can keep the overpaid money. If the employee gains financial advantages, for example buys an expensive television or pays off debts, he enriches himself and has to repay the sum. If an employer only becomes aware of the overpayment after a long period of time and the employee has already spent the money, the employer can plead for deprivation of wealth. The exceptions only provide guidance; in practice, this is always a case-by-case decision. And even if one of the exceptions applies and you might be able to keep the excess Salary, you should consider whether the amount will have a lasting negative impact on your relationship with the employer. If you notice that your salary is too high, you must inform your employer about it. This can result in a warning or, in the worst case, termination without notice.