Specify the rights and obligations of the employer and employee arising from the employment relationship. They are concluded at the company level between the employer and the trade union organisations operating at the employer's. The agreement defines the conditions to be met by the provisions of the employment contract, in particular compensation of employees, other work-related benefits, as well as mutual obligations of the parties regarding compliance with the provisions of the agreement. A collective labour agreement is an internal source of labour law and its provisions must not be less favourable to employees than the generally applicable labour law and implementing acts.

• Act of 26 June 1974, the Labour Code
  Place of publication: (Dz. U. z 2020 r. poz. 1320, z późn. zm.)