If your social security base in Jiujiang, Jiangxi is 19,900 yuan, here's how much you'll pay for each type of insurance:

1. Endowment Insurance:

• For employees, the unit pays 16% of the base, which is ​
  ×16%=
  yuan, and the individual pays 8%, which is ​
  ×8%=
  yuan.

• For the self - employed, the total payment rate is 20%, so the monthly payment is ​
  ×20%=
  yuan.

2. Medical Insurance:

• The unit's payment rate is 8% - 10%. Taking 8% as an example, the unit pays ​
  ×8%=
  yuan, and the individual pays 2%, which is ​
  ×2%=
  yuan.

3. Unemployment Insurance:

• The unit payment rate is 0.8% - 2%. If it's 0.8%, the unit pays ​
  ×0.8%=159.2
  yuan. For urban - registered employees, the individual payment rate is 0.2% - 1%. If it's 0.2%, the individual pays ​
  ×0.2%=39.8
  yuan. Rural - registered employees may be exempt from individual payment.

4. Work - related Injury Insurance:

• The unit payment rate is 0.2% - 1.9%. For example, if it's 0.2%, the unit pays ​
  ×0.2%=39.8
  yuan, and individuals don't pay.

5. Maternity Insurance:

• The unit payment rate is 1%, so the unit pays ​
  ×1%=
  yuan, and individuals don't pay.

In summary, the total social security payment amount varies depending on the type of insurance and whether you are an employee or self - employed. It's recommended to consult the local social security department for the most accurate information.