What is absolute nullity?

Absolute nullity is the invalidity of a legal transaction caused by a serious failure to meet fundamental validity requirements. In the law of obligations it is generally explained as definitive invalidity. However, special areas such as marriage have different rules governing its effects. It is therefore inaccurate to say that absolute nullity always means a transaction is treated as never having occurred. This article provides general information about Turkish law and does not replace legal advice on a specific dispute.

Absolute nullity in contracts: meaning, grounds and consequences

What does definitive invalidity mean? A contract being formed does not mean it is valid. Even if the parties agree and sign, statutory validity requirements may be missing. Definitive invalidity generally means that the transaction does not produce its intended legal effects from the outset. The nature of invalidity is assessed under the applicable provision and the interest it protects. Article 27 of the Turkish Code of Obligations Article 27 addresses definitive invalidity of contracts contrary to mandatory law, morality, public order or personality rights, and contracts with an impossible subject matter. Freedom of contract is not unlimited; the parties' shared wish cannot by itself validate an outcome prohibited by law. Contravention of mandatory provisions Mandatory rules cannot be displaced by agreement. However, not every legal violation automatically invalidates the whole contract. Some provisions prescribe other sanctions or sanctions protecting only a particular party. Their purpose and special rules must be considered together. Morality, public order and personality rights These concepts represent fundamental legal values and protections for individuals. Assessment relies on legal criteria rather than personal dissatisfaction. An agreement aimed at having someone commit a crime illustrates unlawful contractual content. Not every disagreement or burdensome term amounts to absolute nullity. Initial impossibility Article 27 may apply if the subject matter is objectively impossible when the contract is formed. Financial difficulties or later inability to perform are different matters. Subsequent impossibility and obstacles to performance are assessed under other provisions. Partial invalidity An invalid term does not automatically invalidate the rest of the contract. However, the whole contract may be definitively invalid if it is clear that it would not have been concluded without that term. Whether an agreement can survive removal of an unlawful provision requires separate assessment. Invalidity, restitution and time limits Definitive invalidity generally cannot be cured by simple subsequent confirmation. Returning payments or deliveries is nevertheless a separate issue: restitution rules, special exceptions and claim deadlines must be examined. It is inaccurate to say that all rights are unlimited in time merely because a transaction is invalid. Raising invalidity and requesting repayment or return of property are not the same legal claim.

Absolute nullity in marriage, other forms of invalidity and key distinctions

Grounds for absolute nullity in marriage Article 145 of the Turkish Civil Code lists four main situations: an existing marriage at the time of the new marriage; permanent lack of capacity of discernment at the time of marriage; mental illness severe enough to prevent marriage; and a degree of kinship that prevents marriage. Not every illness or family relationship falls within these rules; statutory conditions and degree matter. Who may bring proceedings? Under Article 146, the public prosecutor brings an absolute-nullity action ex officio, and interested persons also have standing. Article 147 sets special restrictions or circumstances in which that right ceases. For example, a prosecutor's ex officio action concerning a marriage that has ended differs from an interested person's request for a ruling. Later acquisition of discernment or recovery from illness also affects standing under special rules. Why does a court decision matter? Under Article 156, only a judge may rule on the nullity of a marriage. Despite grounds for absolute nullity, the marriage produces the effects of a valid marriage until a decision is made. The contractual explanation of invalidity from the outset must not be applied to marriage in a way that ignores this special rule. Difference from relative nullity Relative nullity describes voidability intended to protect a particular person. Temporary lack of discernment, mistake, deception or intimidation in marriage are addressed by separate provisions. Standing and time limits differ from absolute nullity. A problem in a marriage does not necessarily amount to absolute nullity. Are non-existence, annulment and divorce the same? Non-existence concerns missing constitutive elements; definitive invalidity concerns validity defects in a formed transaction. Voidability depends on the protected person exercising a statutory right. Divorce is a separate way of ending marriage. The grounds and assessment for nullity and divorce should not be confused. Frequently asked questions “Is a signed contract necessarily valid?” No; a signature does not remove the need to examine validity. “Can the parties cure invalidity by agreeing?” Mere agreement is generally insufficient; special rules must be examined. “Does absolute nullity mean a court is never needed?” Litigation may be necessary for a finding, restitution or other claims; a judicial decision is expressly required for marriage. Sources and scope Turkish Code of Obligations No. 6098, Articles 26–27; Turkish Civil Code No. 4721, Articles 145–156. Sources checked: 10 October 2026. Legal consequences depend on the type of transaction and the facts.