Invalidity contracts always attracted attention researchers. Without regard to it, in modern conditions there is an enormous layer of the problems related to invalidity contract, that to require a doctrine and utilitarian comprehension. The article is sanctified to research invalidity contract. In the article analyses problems of the legislative regulation and types of invalidity contract through the prism of judicial practice. In the Civil code of Ukraine, a voidable contract sets as a common rule. A voidable of the contract is incarnated in the so-called «virtual» invalidity when only the most typical grounds are enumerated. However, even such approach does not allow to overcome all possible cases that arise up in practice. Such situation touches possibility of voidable contracts concluded with the purpose of to shut out the appeal of claim to the property of the debtor. Therefore it follows to set general rules in relation to voidable contracts of the debtor. A nullity of the contract takes place only in the case when there is the direct pointing of law on the qualification of that or another contract as the nullity. The nullity of contract in the Civil code of Ukraine is constructed by means of «textual» invalidity. There are no single attempts to use the construction of «virtual» invalidity in judicial practice when there is the direct pointing of law on the qualification of that or another contract as the nullity, that is impermissible. Methodologically incorrectly to carry out identifying of invalidity contract and obligation with the aim of providing of application of different after the rich in content filling norms.