The types of social security expenses are supplementary levy and approval.

Legal analysis: the way of social security verification is to pay back the unpaid parties after the social security base changes. The purchase base of social insurance varies from year to year, subject to the latest editorial salary. After the Labor Bureau announces the latest average social wage in June and July every year, it is necessary to adjust the payment base of social insurance. We need to make up the fees paid in previous months to make up the current base. After the adjustment of social average wage, it is necessary to make up the difference between the bases.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 2 The state establishes social insurance systems such as basic old-age insurance, basic medical insurance, industrial injury insurance, unemployment insurance and maternity insurance, so as to guarantee citizens' right to receive material assistance from the state and society in accordance with the law in case of old age, illness, industrial injury, unemployment and maternity.

Article 3 The social insurance system adheres to the principles of wide coverage, basic protection, multi-level and sustainability, and the level of social insurance should be compatible with the level of economic and social development.