What is the reason why social security can't be bought in the new company?

Legal analysis: contact the person who paid social security in the original company to help you quit. If you leave your job for less than a month and enter a new company, you will usually start buying from next month. The original company will take your social security back from the company early next month. If the original company goes out of business or doesn't help out with social security, you can call the social security bureau to ask how to deal with it, but this is rare.

Legal basis: People's Republic of China (PRC) Social Insurance Law.

Article 4 Employers and individuals who pay social insurance premiums according to law in People's Republic of China (PRC) have the right to inquire about payment records and personal rights and interests records, and ask social insurance agencies to provide social insurance consultation and other related services.

Individuals enjoy social insurance benefits according to law and have the right to supervise the payment of their own units.

Fifth people's governments at or above the county level shall incorporate social insurance into the national economic and social development plan.

The state raises social insurance funds through multiple channels. People's governments at or above the county level shall give necessary financial support to social insurance.