In Anhui Ma'anshan, if the social security base is 13,800 yuan, the monthly payment amount is calculated as follows:

1. Pension insurance: The individual payment ratio is 8%, so the individual monthly payment is ​
   ×8%=
   yuan; the unit payment ratio is 22%, and the unit monthly payment is ​
   ×22%=
   yuan.

2. Medical insurance: If it is unit - insured, the unit payment ratio is usually 8%, and the unit monthly payment is ​
   ×8%=
   yuan; the individual payment ratio is 2%, and the individual monthly payment is ​
   ×2%=
   yuan. If it is individual - insured, the individual payment ratio is generally 5%, and the individual monthly payment is ​
   ×5%=
   yuan.

3. Unemployment insurance: The company's payment ratio is 2%, and the company's monthly payment is ​
   ×2%=
   yuan; the individual's payment ratio is 1%, and the individual's monthly payment is ​
   ×1%=
   yuan. However, the ratio may vary slightly depending on the location.

4. Work - related injury insurance: The payment ratio is set according to industry risk classification, and individuals do not need to pay. The enterprise payment ratio ranges from 0.5% to 2% of the insured base. Taking the middle value of 1% as an example, the enterprise monthly payment is ​
   ×1%=
   yuan. The specific ratio may change due to regions, industries, and regulatory requirements.

5. Maternity insurance: The payment ratio is generally 0.8% of the base for on - the - job employees to pay basic pension insurance premiums, and employees generally do not pay maternity insurance premiums. The unit monthly payment is ​
   ×0.8%=110.4
   yuan. The ratio may vary depending on the unit type and region.

6. Housing provident fund: The contribution ratio is usually 5% - 12%, and the unit and individual contribution ratios are 1:1. Taking 12% as an example, both the unit and individual monthly payments are ​
   ×12%=
   yuan.

In summary, when the social security base in Ma'anshan is 13,800 yuan, the specific monthly payment amount varies according to different insurance types and payment ratios. You can calculate the total amount of various insurances according to your actual situation. Note that the above data is for reference only, and the actual situation is subject to local policies.