Customs duties are imposed in accordance with South Africa's Customs and Excise Act 91 of 1964. They are levied on imported goods with the aim of raising revenue and protecting the local market. They are usually calculated as a percentage of the value of the goods (set in the schedules of the Customs and Excise Act). Additional ad valorem excise duties are levied on a wide range of luxury or non-essential items.

Custom duties are therefore payable upon the parcel's arrival in South Africa. The shipping company will notify the customer if any additional payment needs to be made upon the parcel's arrival. This payment will be a percentage of the total value of the customer's goods. 

Once payment is made, your parcel should arrive at your doorstep within a few days.