When did China last pay social security?

By the end of 2023. Inquiring about the Notice on Issues Related to Staged Postponement of Social Insurance Premium shows that the final payment period of deferred social insurance premium will be extended from February 23, 2023 to the end of 2023 after the expiration of three phased deferred social insurance premium policies (basic endowment insurance for enterprise employees, unemployment insurance and industrial injury insurance). Insured units can apply for payment of deferred social insurance premiums by stages or month by month before the end of 2023, and the late payment fee will be exempted during the payment period.