As a rule, employee who are members of signatory trade union benefit from the collective labour agreement. However, since the acceptance of the benefit of only signatory trade union members is detrimental to union freedoms, benefit by paying solidarity dues was also accepted. Employee who do not want to be a member of signatory trade union, but want to benefit from the collective labour agreement in their workplaces are able to benefit from collective labour agreement by paying the solidarity dues that guarantee their freedom to join the union, which he wants and not join the union. Regarding the beginning of benefiting in this way, in the 4th paragraph of Article 39 of the Law on Unions and Collective Labour Agreement numbered 6356 was regulated only”... Benefiting from collective labour agreement by paying solidarity dues is valid from the date of request. Requests before the date of signature become effective as of the date of signature. “ In the aforementioned provision, “Requests before the date of signature are effective as of the date of signature.” sentence has been annulled on the grounds that it is contrary to Articles 13, 51 and 53 of the Constitution. In our study, first of all, benefiting from collective labour agreement by paying solidarity dues and the beginning of this will be included, and after the annulment decision of the Constitutional Court dated 30.12.2020 and numbered 57/83 it will be tried to evaluate this decision