In the Philippines—one of the last nations without a general divorce law—ending a marriage is a complex, often misunderstood legal journey. While the public frequently uses the term "annulment" as a catch-all, Philippine law distinguishes between a Petition for Declaration of Absolute Nullity and a Petition for Annulment.

The distinction lies in whether the marriage was ever valid in the first place.

The Fundamental Distinction

Feature	Declaration of Absolute Nullity	Annulment
Status of Marriage	The marriage is void from the beginning (void ab initio). It never legally existed.	The marriage is voidable. It is valid until a court sets it aside.
Prescription	Does not expire; the action can be filed anytime.	Generally must be filed within five years of discovery or reaching the age of majority.
Grounds	Defect in essential or formal requisites (e.g., bigamy, no license).	Vitiated consent (e.g., fraud, force, physical incapacity).

1. Declaration of Absolute Nullity (Void Marriages)

A marriage is considered void if it lacked the essential elements required by the Family Code.

Common Grounds (Articles 35, 36, 37, 38):

Absence of Requisites: Marriages solemnized without a valid marriage license or by someone without legal authority.
Bigamous or Polygamous Marriages: Marrying someone while a prior marriage is still subsisting.
Incestuous Marriages: Marriages between ascendants/descendants or brothers/sisters.
Public Policy Marriages: Marriages between first cousins or step-parents/step-children.
Psychological Incapacity (Article 36): This is the most "famous" ground. It refers to a party's inability to comply with the essential marital obligations (procreation, living together, mutual love, and respect).

Legal Update (Tan-Andal vs. Andal): Following the landmark 2021 Supreme Court ruling, psychological incapacity is no longer viewed as a medical or clinical illness. It is now considered a legal concept that can be proven by the "totality of evidence," meaning a psychiatrist's testimony, while helpful, is no longer strictly mandatory.

2. Annulment (Voidable Marriages)

An annulment applies to a marriage that is "sick" but not "dead" at the start. It is valid until a judge says otherwise.

Grounds under Article 45:

Lack of Parental Consent: If one party was between 18 and 21 and did not obtain parental consent.
Insanity: If either party was of unsound mind at the time of the wedding.
Fraud: Consent obtained through deception (e.g., concealing a pregnancy by another man, a drug addiction, or a sexually transmitted disease).
Force/Intimidation: Being forced into the marriage at gunpoint or through severe threats.
Impotence: The physical inability to consume the marriage, which must be permanent and existing at the time of the wedding.
Serious/Incurable STD: If one party has a serious, incurable sexually transmitted disease.

3. The Judicial Process

The process is rigorous because the State is mandated to protect marriage as an "inviolable social institution."

Step 1: Filing the Petition. Filed in the Family Court of the province or city where either the petitioner or respondent has been residing for at least six months.
Step 2: Summons. The court notifies the respondent. If they cannot be found, "summons by publication" in a newspaper is required.
Step 3: Collusion Investigation. The Public Prosecutor conducts an investigation to ensure the parties didn't just "agree" to end the marriage (collusion is strictly prohibited).
Step 4: Pre-Trial. The court simplifies the issues and explores if there are any remaining chances for reconciliation.
Step 5: Trial. Presentation of witnesses (petitioner, psychologists, family members) and documentary evidence.
Step 6: Judgment. The court issues a Decision. If granted, the parties must wait for the "Entry of Judgment."
Step 7: Registration. The decree must be registered with the local Civil Registrar and the Philippine Statistics Authority (PSA).

4. Legal Consequences

The end of the marriage does not just change a person's "Single" status; it triggers several legal shifts:

Property Relations: The community property or conjugal partnership is liquidated. In void marriages, if one party acted in "bad faith," they may forfeit their share of the profits.
Custody of Children: Determined based on the "Best Interest of the Child" rule. Usually, children under seven stay with the mother unless she is found unfit.
Legitimacy: Interestingly, children born of marriages declared void under Article 36 (Psychological Incapacity) or Article 53 (failure to record partition) remain legitimate. In most other void marriages, children are considered illegitimate.
Support: The court will issue an order for the support of the children and, in some cases, the innocent spouse.

Important Reality Check

Despite modern legal shifts, there is no such thing as an "automatic" annulment in the Philippines, regardless of how many years the couple has been separated. A judicial decree is the only way to regain the legal capacity to remarry. Unlike common misconceptions, "Legal Separation" does not allow for remarriage; it only permits the couple to live apart and divide their properties.