Za ugovornu obvezu potrebno je postojanje strana, valjana volja, dopustiv i moguć predmet činidbe te propisan oblik ugovorne obveze. Svaka ugovorna obveza mora biti izražena u formalnom i neformalnom obliku.
Danas često dolazi do nevaljanosti ugovorne obveze, a također i do brojnih razloga prestanka ugovorne obveze. Kod prestanka ugovorne obveze važnu ulogu ima Zakon o obveznim odnosima u kojem se uređuju glavni razlozi prestanka ugovorne obveze.
Danas ugovorna obveza prestaje načešće zbog ispunjenja, polaganjem i prodajom dugovane stvari, cesijom umjesto ispunjenja, obnovom ili inovacijom, prijebojem ili kompenzacijom, otpustom duga, sjedinjenjem – konfuzijom, smrću strane, nastankom nemogućnosti ispunjenja, proteklom vremena, otkazom i raskidom ugovora.For a contractual obligation, there is a need for a party, a will, a permissible and possible object of the case and a prescribed form of contractual obligation. Each contractual obligation must be expressed in a formal and informal form.
Today, there is often a lack of contractual obligations, as well as numerous reasons for termination of contractual obligations. The Mandatory Relationship Act, which regulates the main reasons for termination of contractual obligations.
Nowadays, the contractual obligation ceases to be due to the fulfillment, depositing and selling of debts, instead of completion, renewal or innovation, termination or compensation, debt relief, confusion, death of the party, the impossibility of fulfillment, past times, cancellation and termination of contract
