The customs and import tax on a certain country mainly depends on its local GST/VAT and the products being shipped. Tax & duty threshold is the amount by which someone will need to pay his or her tax and duty fees based on the declared value of his or her product.
If the declared value is below the threshold, he or she will normally need not to pay such fees
Angola is currently using the CIF method.
This means that the declared value of the product, insurance (if any) and freight/shipping cost are all considered when calculating for customs tax and fees.