Adjudication of stamp duty means to pass a judgement or to adjudge how much stamp duty is payable for the registration of a particular document. When the quantum of stamp duty is variable and not fixed, it may often lead to confusion as to how much stamp duty is payable. If you are buying a new property, you will have to pay a fee called stamp duty, which is levied by the state government. This fee is used to validate the registration of your property in your name, and legalise your property ownership document. Without paying stamp duty on the property registration document, you will not be considered a legal owner of the property in question.