In Fujian Fuzhou, a social security base of 15,900 yuan falls within the upper - middle range of the local social security contribution base. As of 2025, the upper limit of the social security contribution base in Fuzhou is 22,164 yuan/month, determined as 300% of the local average social wage, and the lower limit is 4,043 yuan/month, set at 60% of the local average social wage. Here's a breakdown:

1. Proportion of the upper limit: Since the upper limit of the contribution base is 22,164 yuan, 15,900 yuan accounts for ​
   ​×100%≈71.73%
   of the upper limit. This indicates that it is not the highest contribution level but is relatively close to the upper - middle position within the contribution range.

2. Calculation of contribution amount:

• Endowment insurance: The unit contribution rate is 16%, and the individual contribution rate is 8%. For a unit, the endowment insurance contribution with a base of 15,900 yuan is ​
  ×16%=
  yuan per month; for an individual, it is ​
  ×8%=
  yuan per month.

• Medical insurance: The unit contribution rate is 8%, and the individual contribution rate is 2%. The unit's medical insurance contribution is ​
  ×8%=
  yuan per month, and the individual's is ​
  ×2%=
  yuan per month.

• Unemployment insurance: The unit and individual contribution rates are both 0.5%. The unit's unemployment insurance contribution is ​
  ×0.5%=79.5
  yuan per month, and the individual's is also 79.5 yuan per month.

• Maternity insurance: The unit contribution rate is 0.7%, and individuals do not contribute. The unit's maternity insurance contribution is ​
  ×0.7%=111.3
  yuan per month.

3. Impact on future benefits:

• Pension: When calculating the pension, a higher contribution base like 15,900 yuan generally leads to a higher pension amount in the future. The pension calculation is related to factors such as the contribution base and contribution years. A higher contribution base means more contributions are made during the working years, and thus a larger share in the pension pool, resulting in a relatively higher pension income after retirement.

• Medical reimbursement: Although the medical reimbursement ratio is not directly related to the contribution base, in some cases, a higher - contribution - base insured person may have a higher medical reimbursement ceiling or more favorable treatment in some supplementary medical insurance policies, which can provide better medical security.

In general, a social security base of 15,900 yuan in Fuzhou reflects a relatively high - income level of the insured. It not only means a higher current contribution amount but also is expected to bring relatively better social security benefits in the future, such as a higher pension and potentially more comprehensive medical security. However, it should be noted that specific benefit calculations are also affected by other factors such as contribution years and policy adjustments.