Carrier fees are often a surprise to online retailers just starting to calculate and collect landed cost because they are usually only seen and paid for by your customers when they receive their international shipments. Carrier fees are an important part of landed cost calculations. If you don’t set them up correctly and you are allowing prepayment of duties and taxes, you will lose money because you will end up paying the carrier fees on behalf of your customers. You may need to find out from your carrier what your fees are, but typically, unless you have negotiated to get them lowered or waived, they will likely be part of your landed cost and international shipments where you are allowing customers to prepay duties and taxes.