What month is the annual report of Hangzhou social security base?

The filing time is adjusted from March 1 to March 3 1 every year.

The payment base can be exempted from declaration and adjusted by the agency: the insured who is insured as a freelancer or a flexible employee can be exempted from declaration in the following two cases and adjusted by the agency: 1. The original payment base is within the approved scope of the new annual payment base, and it is required to retain the original payment base. 2. The original payment base is lower than this year's minimum payment base, and I am willing to pay according to this year's minimum payment base.