Is it necessary to transfer social security? What's the impact?

This is necessary. If you don't transfer, you can't participate in the insurance payment in your new unit. It is recommended to handle the transfer and payment procedures in time. After the transfer, your payment time and personal account balance will be calculated cumulatively. Failure to transfer will affect future pension collection.

Article 86 of People's Republic of China (PRC) 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 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.

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The above answer is only for the current information combined with my understanding of the law, please refer carefully!

If you still have questions about this issue, I suggest you sort out relevant information and communicate with professionals in detail.