The company doesn't pay social security, but it deducts personal income tax every month. I pay social security myself. Can I deduct social security before tax and pay less tax?

No, it is illegal for a company not to pay social security. Employees of the company must be required to pay social security, and the individual tax is calculated after deducting insurance expenses. The tax basis is to deduct all. From 20 11September1day, Chinese mainland's tax exemption will be adjusted to 3500 yuan.

Personal income tax is the general name of legal norms that adjust the social relationship between tax authorities and natural persons (residents and non-residents) in the process of personal income tax collection and management.

Taxpayers of individual income tax include resident taxpayers and non-resident taxpayer. Resident taxpayers have the obligation to pay taxes in an all-round way, and must pay individual income tax on all their income inside and outside China; Non-resident taxpayer only pays individual income tax on its income derived from China.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.