The concept of the valid reason for termination of the employment contract

The right to terminate an employment contract is limited in Modern labor law to protect an employee who is dependent on the employer and is also economically powerless. At the beginning of these limitations is the concept of job security. This concept aimed to protect workers from arbitrary termination by the employer. In my study, the place, importance and conditions of the concept of 'job security' in Turkish Labour Law were included together with the provisions of the relevant legislation. The concept of 'valid reason', which takes its main source from the concept of job security and is regulated in Article 18 of the law, has been examined. First, the concept of a valid reason was defined, and then the articles of law and the case law of the Supreme Court were listed as articles on which the valid reason was accepted. In addition, the same article was also included in the content of the thesis in cases that do not constitute a valid reason. In practice, it was desirable to provide clarity about the two types of termination by comparing the concepts of justified termination and termination based on a valid reason, which are most confused. In the last part of my study, the results of invalid termination are discussed. The legal nature of the return to work case, periods, rights to be requested are included in the thesis content. Keywords: Termination, Job Assurance, Valid Reason, Justified Reason, Return To Work Case