Labor Law No. 4857:
Changes in working conditions and termination of the employment contract
Article 22 – The employer can only make a fundamental change in the working conditions created by the employment contract or the personnel regulation and similar sources that are annexes to the employment contract or workplace practices by notifying the employee in writing.

Changes that are not made in accordance with this form and are not accepted in writing by the employee within six working days are not binding on the employee.

If the employee does not accept the change proposal within this period, the employer may terminate the employment contract by explaining in writing that the change is based on a valid reason or that there is another valid reason for termination and by complying with the notification period.

In this case, the employee may file a lawsuit according to the provisions of Articles 17 to 21.

The parties may change the working conditions at any time by mutual agreement. Changes in working conditions cannot be put into effect retroactively.


Source: Labor Law No. 4857
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