Does one month after the downsizing on the 25th count?

Not exactly. The increase or decrease of social security in the current month will take effect before 25th and next month after 25th. Resigned employees should apply for social security relief in time in the month of resignation, and no social security application data will be generated in the month after the relief is successful. Article 58 of the Social Insurance Law, the employing unit shall, within 30 days from the date of employment, apply to the social insurance agency for social insurance registration for employees. If the social insurance has not been registered, the social insurance agency shall verify the social insurance premium it should pay. Article 86 If an employer fails to pay social insurance premiums in full and on time, the social insurance premium collection agency shall order it to pay within a time limit or make up for it, and from the date of default, an overdue fine of 5/10000 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.