How much is the overdue social security fee for 3 years?

There must be some mistake. You don't have a late fee. According to the provisions of the Social Insurance Law, employers and individuals who return to work after the interruption of personal social security shall pay a certain percentage of their wages, and there is no need to pay late fees. However, if the employer fails to pay on time and pays back, it needs to pay a late fee. Article 86 of the Social Insurance Law, if the employer fails to pay the social insurance premium in full and on time, the social insurance premium collection agency shall order it to pay it within a time limit or make up for it, and from the date of non-payment, an overdue fine of five ten thousandths shall be added daily; Failing to pay within the time limit, the relevant administrative departments shall impose a fine of more than one time and less than three times the amount owed.