Proof and Compensation Strategies in Divorce Lawsuits Based on Adultery and Breach of the Duty of Loyalty

In Turkish law, the matrimonial union imposes not only the obligation to live together but also the duty of loyalty, honesty, mutual trust, and the protection of common life. One of the most severe breaches of these obligations is adultery, i.e., infidelity. Adultery is regulated as a special and absolute ground for divorce in the Turkish Civil Code (TCC). Therefore, when the fact of adultery is proven with appropriate and sufficient evidence, in most cases, there is no need for the court to further discuss whether the matrimonial union has been shaken.

However, the most critical issues in practice are how to prove infidelity, which evidence will be considered legally obtained, when the 6-month statutory forfeiture period begins, and how to establish the distinction between adultery and a general breach of the duty of loyalty. Not every act of infidelity is legally accepted as adultery. Many behaviors that cannot be proven at the level of sexual intercourse may still result in divorce, compensation, and alimony consequences as "trust-shaking behavior" or "breach of the duty of loyalty."

In divorce cases in Antalya, files containing allegations of infidelity frequently proceed through phone records, hotel accommodation information, social media content, WhatsApp correspondence, witness statements, and civil registry records. This guide systematically addresses the requirements for a divorce lawsuit based on adultery, evidence standards, statutory forfeiture periods, the concept of forgiveness, pecuniary and non-pecuniary compensation, the balance of alimony, and effects on the property regime.

What is Adultery? Legal Nature Under TCC Art. 161

Adultery, regulated under Article 161 of the Turkish Civil Code, is the act of a married person having sexual intercourse with someone other than their spouse. For it to be legally considered adultery, mere emotional closeness or a suspicious relationship is not deemed sufficient; sexual intercourse must be demonstrated with conclusive evidence or strong presumptions.

The most important legal consequence of adultery is that it is an absolute ground for divorce. This means that once adultery is proven, the court can decide on divorce without subjecting the question of "whether the matrimonial union is shaken to its core" to as broad an evaluation as in general grounds for divorce.

Are Adultery and Breach of the Duty of Loyalty the Same Thing?

No. Every act of adultery is a breach of the duty of loyalty; however, not every breach of loyalty is adultery. The duty of loyalty requires spouses to show sexual, emotional, and moral commitment to each other under TCC Art. 185. Therefore, intensive messaging with someone else, emotional affairs, secret meetings, or extramarital closeness may constitute a breach of loyalty, but they are not necessarily categorized as adultery.

Statutory Forfeiture Periods: 6 Months and 5 Years

According to TCC Art. 161/2, the right to file for divorce based on adultery expires 6 months after the aggrieved spouse learns of the adultery and, in any case, 5 years after the act of adultery occurred. These are statutory forfeiture periods, meaning the court takes them into account ex officio.

The "date of learning" is the most debated issue. The period begins not when suspicion arises, but when the fact of adultery is learned. However, if the adultery is "continuous" (e.g., the spouse is living with a third party), the evaluation of the period may differ in practice.

The Concept of Forgiveness

In an adultery-based divorce case, one of the most critical defenses is forgiveness. According to the law, the party who forgives has no right to sue. If the aggrieved spouse has explicitly or implicitly forgiven the other despite knowing about the adultery, they can no longer file a lawsuit based on that specific incident. However, staying in the same house for mandatory reasons or temporary contact for the sake of children does not automatically constitute legal forgiveness.

Which Evidence Can Be Used in Adultery Cases?

The court does not look for direct eyewitnesses to sexual intercourse; however, it requires concrete facts that create a strong conviction that sexual intercourse occurred.

• WhatsApp and Social Media Records: Very strong if they contain sexual content or evidence of a regular relationship.
• Hotel Records: Staying in the same hotel room or under the same conditions with a member of the opposite sex is considered a strong presumption of adultery.
• Extramarital Child: One of the most conclusive and concrete proofs of adultery.
• Witness Statements: Important for supporting the existence of the relationship and the date of learning.

Effect of Adultery on Property Regime Liquidation

This is an extremely important matter. If the divorce decree is granted based on adultery, the judge may reduce or completely eliminate the share of the adulterous spouse in the surplus value (artık değer) pursuant to TCC Art. 236/2. This is a very powerful sanction, as spouses normally share the surplus value equally in the regime of participation in acquired property.

Does Adultery Automatically Affect Custody?

No. The fundamental criterion in custody is the "best interests of the child." However, if the adulterous spouse's lifestyle, living the relationship in front of the child, or establishing an irregular life poses a risk to the child's development, this fact may become significant in the custody evaluation.

Conclusion

Adultery is one of the most severe breaches of the duty of loyalty in Turkish law and produces the most devastating legal consequences among special grounds for divorce. However, filing a lawsuit based on adultery requires proving this fact with appropriate, timely, and legally obtained evidence. Since the distinction between TCC 161 (Adultery) and TCC 166 (General Grounds) directly affects compensation, alimony, and property division, the technical structure of the case is of decisive importance.

Divorce Attorney’s Guide — Att. Rafet Aslan