How much less per month will you receive in retirement after paying one less year of social security

Everyone is different. Some pay one month less and their pension is $10 less a month. A year less about 120 dollars.

The contribution base is low, the difference may not be so much, pay one year less pension insurance, may be about 100 dollars less a month.

Legal basis:

The Law of the People's Republic of China on Social Insurance

Article 12: The employer shall pay the basic pension insurance premiums in accordance with the proportion of the total wages of the employees of the organization as stipulated by the state, and credit it to the Basic Pension Insurance Co-ordination Fund.

Employees shall pay basic pension insurance contributions in proportion to their own wages as prescribed by the State, which shall be credited to their individual accounts.

Individual industrial and commercial households without employees, part-time workers who have not participated in basic pension insurance with their employers, and other flexibly employed persons who participate in basic pension insurance shall pay basic pension insurance premiums in accordance with the State's regulations, which shall be credited to the Basic Pension Insurance Coordination Fund and to their individual accounts respectively.

Article 60 Employers shall declare and pay social insurance premiums on their own, in full and on time, and shall not defer or reduce payment except for force majeure and other legal reasons. Employees shall pay social insurance premiums by the employer withholding, the employer shall inform the person of the details of the payment of social insurance premiums on a monthly basis.

Individual entrepreneurs without employees, part-time workers who do not participate in social insurance with their employers, and other flexibly employed persons may pay social insurance premiums directly to the social insurance premium collection organization.