sur·charge / ˈsərˌchärj/ • n. 1. an additional charge or payment: we guarantee that no surcharges will be added to the cost of your trip. ∎ a charge made by assessors as a penalty for false returns of taxable property. ∎ the showing of an omission in an account for which credit should have been given.2. a mark printed on a postage stamp changing its value.• v. [tr.] 1. exact an additional charge or payment from: retailers will be able to surcharge credit-card users.2. mark (a postage stamp) with a surcharge.
An overcharge or additional cost.
A surcharge is an added liability imposed on something that is already due, such as a tax on tax. It also refers to the penalty a court can impose on a fiduciary for breaching a duty.
In equity, surcharging means to show that a particular item, in favor of the party surcharging, should be included in an account that is alleged to be settled or complete.