Surcharges are a type of additional fee imposed on top of the standard cost of a service or product. Some synonyms for surcharges include extra charges, additional fees, overcharges, supplemental costs, and add-on fees. These words all convey the same meaning as surcharges, expressing the idea of an extra payment that must be made. Surcharges can be applied to a wide range of services, including travel, shipping, and utility bills. Whatever the context may be, it is important to be aware of the different synonyms for surcharges so that you can properly understand any additional fees that you may have to pay.