What if I join two companies at the same time?

Legal analysis: two companies are in the same area, so you can't pay social security in both companies at the same time. You can only choose to participate in one of the companies to pay social security. 1, you can negotiate with another company because you don't need to pay social security insurance to raise your salary. 2, an employee to participate in social insurance can only be a social insurance number, if it is a heavy number, you can only enjoy one of the social insurance benefits. So you don't have to pay double the social insurance premium.

Legal basis: Article 99 of the Labor Law of People's Republic of China (PRC), if the employing unit recruits workers whose labor contracts have not been terminated, thus causing economic losses to the original employing unit, the employing unit shall be jointly and severally liable for compensation according to law.