Can Jinhua pay the social security for that month at the end of the month?

No.30 individual can't pay social security for the current month.

If an individual is insured in the current month and it is the last day of the 30th of the current month, he cannot pay the social security of the current month. On the 30th, individuals can submit personal insurance information to the Social Security Bureau, which will be approved on the spot. After the audit is completed, he can enter the social security system, but it is impossible to pay social security on the 30th. The social security bureau has settled the account on the 30 th, and it can't be paid. Only accumulate until next month to hand it in together.