How much salary reduction can be arbitrated?

As long as the salary is reduced unilaterally in violation of the agreement, you can apply for labor arbitration regardless of whether the salary is reduced or not.

According to the information of Zhihu, Fakuai and Fatu, the employer and the employee can change the contents of the labor contract through consultation. Enterprise salary reduction can only be implemented after consultation with workers. If the company does not expressly stipulate that there is no reason to adjust posts and reduce employees' wages, then employees can apply to the Labor Arbitration Committee for arbitration and ask the company to pay their wages in full. From the perspective of labor law, post adjustment and salary reduction belong to the change of labor contract. According to the provisions of the Labor Contract Law, the change of the labor contract requires both the employer and the employee to reach an agreement through consultation. Therefore, in principle, employees with less promotion and salary increase cannot be implemented without approval.