If your social security base in Lianyungang, Jiangsu is 13,900 yuan, the amount of tax deducted mainly involves personal income tax, and the specific amount depends on various factors such as your deductions. Here's a breakdown:

1. Social security deductions:

• Pension insurance: The individual contribution rate is generally 8%, so the amount deducted for pension insurance is ​
  ×8%=
  yuan.

• Medical insurance: Usually around 2%, so it's ​
  ×2%=
  yuan.

• Unemployment insurance: Approximately 0.5%, which amounts to ​
  ×0.5%=69.5
  yuan.

• Work-related injury insurance and maternity insurance: These are borne by the unit, and individuals do not need to pay.

2. Calculation of personal income tax:

• First, calculate the taxable income: Taxable income = Monthly income - 5000 yuan (tax threshold) - Special deductions (social security, etc.) - Special additional deductions - Other deductions determined by law. Suppose there are no special additional deductions and other deductions, the taxable income is ​
  −−−−69.5=7440.5
  yuan.

• Then, find the applicable tax rate and quick deduction number according to the taxable income. According to the personal income tax rate table, for a taxable income of 7440.5 yuan, the applicable tax rate is 3%, and the quick deduction number is 0. So the personal income tax payable is ​
  7440.5×3%−=223.215
  yuan.

In general, when the social security base is 13,900 yuan, the amount of tax deducted includes social security deductions and personal income tax. The specific amount may vary according to personal special additional deductions and other actual situations.

计算结果基于常规比例，实际扣税可能因政策微调、个人具体扣除项差异而有所不同。如果你能提供更详细的个人扣除信息，比如专项附加扣除的具体情况，我可以为你进一步精准计算扣税金额 。