Wedding rings resting on a legal document, symbolizing the distinction between annulment and legal separation grounds for marital infidelity in the Philippines

Is Adultery a Ground for Annulment in the Philippines? What the Law Actually Says

Many people searching for a way out of a marriage after a spouse’s affair assume that the affair itself is the legal ground they need. Under Philippine law, it is not. Article 45 of the Family Code lists only six specific causes for annulling a marriage, and adultery or infidelity is not one of them. This guide explains exactly where infidelity does fit in Philippine family law, why the mix-up with annulment happens, and what remedy actually applies when a spouse has been unfaithful.

Direct Answer

No. A spouse’s adultery, infidelity, or an extramarital affair is not a ground for annulling a marriage under Article 45 of the Family Code, and it is not a ground for declaring a marriage void under Articles 35 through 38 or Article 36 either. Article 45 lists exactly six exclusive causes for annulment — lack of parental consent, unsound mind, fraud as narrowly defined in Article 46, force or intimidation, incurable physical incapacity, and a serious incurable sexually transmissible disease — and infidelity does not appear on that list. Instead, infidelity is a recognized ground for legal separation under Article 55(8) of the Family Code, which covers “sexual infidelity or perversion.” Legal separation is a different remedy: it lets spouses live apart and lets a court resolve property, support, and related issues, but it does not end the marriage bond and does not allow either spouse to remarry. Separately, adultery and concubinage can also be prosecuted as distinct criminal offenses under Articles 333 and 334 of the Revised Penal Code — a track entirely apart from a family-court annulment or legal-separation case. A spouse who wants to end a marriage because of an affair needs to look at legal separation as the matching civil remedy, not an annulment petition built on the affair itself.

Decision Snapshot

  • Applies to: Anyone considering an annulment, nullity, or legal-separation case where a spouse’s infidelity is the central complaint.
  • The core rule: Article 45’s six annulment grounds are exclusive and do not include adultery, infidelity, or an affair.
  • Where infidelity actually fits: Article 55(8) of the Family Code — “sexual infidelity or perversion” — is a ground for legal separation, not annulment.
  • Legal separation does not end the marriage: it authorizes living apart and resolves property, support, and related issues, but neither spouse may remarry afterward.
  • First action: Identify which specific legal box your facts actually fit — annulment, nullity, or legal separation — before filing, since each has different grounds, evidence requirements, and effects.

Key Takeaways

  • Article 45 of the Family Code lists exactly six grounds for annulment, and adultery or infidelity is not among them — the list is exclusive, not illustrative.
  • Infidelity is expressly named as a ground for legal separation under Article 55(8), a different remedy that keeps the marriage bond intact.
  • A declaration of nullity (a void marriage, including under Article 36 psychological incapacity) is also a legally distinct track from legal separation, with different elements and evidence — infidelity by itself does not establish psychological incapacity.
  • Adultery and concubinage remain separate criminal offenses under the Revised Penal Code, prosecuted in a criminal court under different rules than a Family Court civil case.
  • Filing an annulment petition based only on an affair is very likely to be dismissed for failing to state a ground the law recognizes — the correct filing is a legal-separation petition instead.
  • A pattern of infidelity can sometimes be part of the fuller evidentiary picture in a genuinely separate case (for example, a psychological-incapacity nullity case), but it must support an actual recognized ground — it cannot stand in for one.

In This Guide

Why Adultery Alone Is Not an Annulment Ground

Article 45 of the Family Code allows a marriage to be annulled only for one of six specific causes that existed when the marriage was celebrated: lack of parental consent for a party then 18 to below 21, unsound mind, fraud as narrowly defined in Article 46, force or intimidation or undue influence, incurable physical incapacity to consummate the marriage, and a serious and incurable sexually transmissible disease. These six grounds are exhaustive. A marriage cannot be annulled for a reason outside this list, regardless of how serious or hurtful the underlying conduct is. Infidelity that occurs during the marriage does not fit any of the six causes, because those causes all concern a defect that existed at the moment the marriage was entered into — not conduct that happens afterward.

This is also why infidelity is not a ground for a declaration of nullity of a void marriage. The void-marriage grounds — psychological incapacity under Article 36, marriages below the legal age or otherwise defective from the start under Article 35, and the prohibited-relationship categories under Articles 37 and 38 — likewise do not include adultery or infidelity as such. For the full six-ground breakdown and how each is proven, see FamilyCode.ph’s guide to grounds for annulment under Article 45.

Article 55 of the Family Code lists ten exclusive grounds on which a spouse may petition for legal separation. Ground eight is “sexual infidelity or perversion.” This is the provision that actually covers an unfaithful spouse — not Article 45. Legal separation lets the innocent spouse obtain a court decree allowing the couple to live separately, and it lets the court resolve consequences such as property division, support, and the offending spouse’s forfeiture of a share of community or conjugal profits. It does not, however, dissolve the marriage. Both spouses remain married to each other, and neither may legally remarry unless the marriage is later annulled, declared void, or otherwise ended through a legally recognized process. For the full grounds list, evidence considerations, and procedure, see FamilyCode.ph’s guide to legal separation in the Philippines.

Article 55 also lists abandonment of the petitioner without justifiable cause for more than one year as a separate, tenth ground. Like infidelity, abandonment is a legal-separation ground, not an annulment ground — the same distinction applies to both. See FamilyCode.ph’s dedicated guide to whether abandonment is a ground for annulment for the full breakdown, including the separate, faster property remedy an abandoned spouse can pursue under Articles 101 and 128.

Filing periods matter here too. Under Article 57, a legal-separation petition generally must be filed within five years from the time the cause occurred. Waiting too long after discovering an affair can foreclose the remedy even where the underlying facts are not in dispute.

The Separate Criminal Track: Adultery and Concubinage

Apart from the civil family-law remedies above, Philippine law also treats marital infidelity as a criminal matter through two distinct offenses in the Revised Penal Code (Act No. 3815): Article 333 (Adultery), which applies to a married woman who has sexual relations with a man not her husband, and Article 334 (Concubinage), which applies to a married man in specific circumstances — keeping a mistress in the conjugal home, having sexual relations under scandalous circumstances, or cohabiting with a woman elsewhere. These are prosecuted as criminal cases, with different elements, evidentiary standards, and penalties for each offense, and they are entirely separate from a Family Court annulment, nullity, or legal-separation case. The Philippine Commission on Women has publicly noted that these two provisions treat husbands and wives differently and has recommended their repeal in favor of addressing marital infidelity through civil remedies, though the provisions remain in force unless and until Congress amends them. A spouse weighing whether to pursue a criminal complaint, a legal-separation case, or both should discuss the distinct requirements and consequences of each with a lawyer, since a criminal case does not by itself change either spouse’s civil status or resolve support, custody, or property issues.

Can Infidelity Ever Factor Into a Nullity Case?

Occasionally, a pattern of infidelity is raised as part of the evidence in a psychological-incapacity case under Article 36 — for example, as one indicator among several of a spouse’s inability to comply with essential marital obligations. This is a fundamentally different legal question from whether infidelity is itself a ground. Psychological incapacity requires proof of a genuinely disabling condition affecting a spouse’s capacity to fulfill marital obligations, not simply proof that the spouse was unfaithful. An affair, by itself and without more, does not establish psychological incapacity, and a nullity petition cannot substitute infidelity for the legal elements the courts actually require. Readers considering this route should start with FamilyCode.ph’s dedicated guides to psychological incapacity under Article 36 and to how the current legal standard for proving it works, since the evidentiary bar is substantial and case-specific legal advice is essential before filing on this basis.

Authority What it governs Relevance
Family Code of the Philippines (Executive Order No. 209), Art. 45 Enumerates the six exclusive grounds for annulling a voidable marriage Confirms adultery/infidelity is not among the recognized annulment grounds
Family Code, Arts. 35–38 and Art. 36 Grounds on which a marriage is void from the beginning, including psychological incapacity Confirms infidelity is also not, by itself, a void-marriage or nullity ground
Family Code, Art. 55 Lists the exclusive grounds for legal separation, including “sexual infidelity or perversion” (par. 8) and abandonment for more than one year (par. 10) Identifies the actual civil remedy that covers a spouse’s infidelity
Family Code, Art. 57 Sets the five-year filing period for a legal-separation action from the occurrence of the cause Determines whether a legal-separation case based on infidelity is still timely
Revised Penal Code (Act No. 3815), Arts. 333–334 Defines adultery and concubinage as distinct criminal offenses Identifies the separate criminal-law track apart from the civil family-law remedies
A.M. No. 02-11-10-SC, Rule on Declaration of Absolute Nullity of Void Marriages and Annulment of Voidable Marriages (2003) Procedure for annulment and nullity petitions Governs the pleading standard an annulment petition must meet, which an infidelity-only petition would not satisfy
A.M. No. 02-11-11-SC, Rule on Legal Separation (2003) Procedure for legal-separation petitions Governs the correct procedural pathway for an infidelity-based claim

Common Misunderstandings

  • “My spouse cheated, so I can file for annulment.” Infidelity is not one of Article 45’s six exclusive grounds. The matching remedy is legal separation under Article 55(8), which is a different kind of case with different legal effects.
  • “Legal separation because of infidelity means I can remarry.” It does not. Legal separation keeps the marriage bond intact; only annulment, a declaration of nullity, or a legally recognized foreign divorce can free a spouse to remarry.
  • “If I have proof of the affair, that alone proves psychological incapacity.” It does not. Psychological incapacity requires evidence of a genuinely disabling condition affecting the capacity to fulfill marital obligations, not simply proof of unfaithfulness.
  • “Adultery and concubinage are the same crime for husbands and wives.” They are legally distinct offenses under Articles 333 and 334 of the Revised Penal Code, with different elements depending on whether the accused spouse is the wife or the husband.
  • “A criminal adultery or concubinage case will also end my marriage.” It will not. A criminal conviction addresses criminal liability only; it does not by itself dissolve the marriage or resolve civil issues like property, support, or custody.

Practical Checklist

  1. Confirm which specific remedy actually matches your situation — legal separation for infidelity, not annulment — before drafting or filing anything.
  2. If legal separation is the right fit, confirm you are within the five-year filing period under Article 57.
  3. Gather evidence relevant to the Article 55(8) ground, handled lawfully and without violating another person’s privacy or security unlawfully.
  4. If a genuinely separate ground such as psychological incapacity may also apply, discuss the distinct elements and evidence it requires with a lawyer rather than relying on the infidelity alone.
  5. Decide, with legal advice, whether a criminal complaint under the Revised Penal Code is also appropriate, understanding that it is a separate track from any family-court case.
  6. Consult a Philippine family-law lawyer, or the Public Attorney’s Office if you qualify, to confirm the correct petition, grounds, and evidence before filing.

Frequently Asked Questions

Is cheating or having an affair grounds for annulment in the Philippines?

No. Article 45 of the Family Code lists six exclusive grounds for annulment, and infidelity is not one of them. Infidelity is instead a ground for legal separation under Article 55(8).

Can I use my spouse’s infidelity to get a declaration of nullity instead?

Not on its own. Nullity grounds — including psychological incapacity under Article 36 and the other void-marriage categories — require proof of their own specific legal elements. Infidelity alone does not establish any of them, though it may sometimes be part of a fuller evidentiary picture in a genuinely separate, properly grounded case.

Does legal separation because of infidelity let me remarry?

No. A legal-separation decree lets spouses live apart and resolves issues like property and support, but the marriage bond continues. Neither spouse may remarry unless the marriage is later annulled, declared void, or otherwise legally ended.

Can I file both a legal-separation case and a criminal adultery or concubinage complaint?

These are separate legal tracks with different rules, and pursuing one does not automatically resolve the other. Discuss the distinct requirements, evidence, and consequences of each with a lawyer before deciding how to proceed.

How long do I have to file a legal-separation case based on infidelity?

Article 57 of the Family Code generally requires the action to be filed within five years from the occurrence of the cause. Confirm the applicable timeline for your specific facts with a lawyer.

Related Guides

Sources and Legal Citations

Statutes and codes

  • Family Code of the Philippines, Executive Order No. 209 (1987), Arts. 35–38, 45, 46, 55, 57 — full text via LawPhil
  • Revised Penal Code, Act No. 3815 (1930), Arts. 333–334 (Adultery and Concubinage)

Supreme Court rules

  • A.M. No. 02-11-10-SC, Rule on Declaration of Absolute Nullity of Void Marriages and Annulment of Voidable Marriages (2003) — full text via LawPhil
  • A.M. No. 02-11-11-SC, Rule on Legal Separation (2003) — full text via LawPhil

Official agency material

Sources rechecked as of: September 20, 2026

This article is general legal information for the Philippines and is not legal advice. It does not cover every possible fact pattern, and the correct remedy, evidence, and filing periods can turn on case-specific details. For advice about your specific situation, consult a Philippine lawyer or, if you qualify, the Public Attorney’s Office.

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