In the Philippines, "till death do us part" is taken quite literally. Aside from the Vatican City, the Philippines remains the only country in the world where civil divorce is not legal. For those trapped in irreparable marriages, the primary legal recourse is either a Petition for Annulment or a Petition for Declaration of Nullity of Marriage.

While laypeople often use the term "annulment" as a catch-all, Philippine law distinguishes between a marriage that was valid but has grounds to be set aside (voidable) and a marriage that was never valid from the beginning (void ab initio).

1. Annulment vs. Declaration of Nullity

Understanding the legal distinction is the first step in determining your cause of action under the Family Code of the Philippines.

Voidable Marriages (Annulment - Article 45)

These marriages are considered valid until they are set aside by a court decree. The grounds must exist at the time of the marriage:

Lack of Parental Consent: If either party was between 18 and 21 and married without parental consent (unless they continued to cohabit freely after reaching 21).
Insanity: Either party was of unsound mind.
Fraud: Obtaining consent through deceit (e.g., concealment of a prior conviction, drug addiction, or a sexually transmitted disease).
Force, Intimidation, or Undue Influence.
Physical Incapacity: Impotence that is perceived to be incurable.
Serious and Incurable STD.

Void Marriages (Nullity - Article 35 & 36)

These marriages are considered non-existent from the start. Common grounds include:

Psychological Incapacity (Article 36): The most cited ground. It refers to a party’s inability to comply with the essential marital obligations due to a psychological condition.
Bigamous/Polygamous Marriages.
Incestuous Marriages.
Absence of formal requisites: (e.g., no valid marriage license or no authority of the solemnizing officer).

2. The Ground of Psychological Incapacity (Article 36)

For decades, Article 36 required a "clinical" diagnosis. However, the landmark Supreme Court ruling in Tan-Andal v. Andal (2021) shifted the standard.

Psychological incapacity no longer needs to be a medical or clinical personality disorder. It is now viewed as a legal concept that can be proven by ordinary witnesses who can testify to the person’s behavior. It must still be characterized by:

Gravity: It must be serious enough that the party cannot function as a spouse.
Juridical Antecedence: It must have existed at the time of the celebration of the marriage.
Incurability: It must be "incurable" in the legal sense, meaning the person's personality structure makes them incapable of fulfilling marital vows with this specific spouse.

3. The Step-by-Step Legal Process

The journey through the Philippine judicial system is often described as "glacial." Here is the typical roadmap:

Step 1: Engagement of Counsel and Psychological Evaluation

You must hire a private lawyer to draft the petition. If filing under Article 36, you will usually undergo an evaluation by a psychologist or psychiatrist to establish the psychological framework of the incapacity.

Step 2: Filing the Petition

The petition is filed in the Regional Trial Court (RTC) of the province or city where the petitioner or respondent has been residing for at least six months.

Step 3: The Collusion Investigation

Because the state has an interest in protecting marriage, the Public Prosecutor (Fiscal) will conduct an investigation to ensure that the parties are not "teaming up" or "conspiring" to get the annulment (collusion). If the Fiscal finds evidence of collusion, the case is dismissed.

Step 4: Pre-Trial and Trial

During the trial, the petitioner presents evidence. This includes:

Testimony of the petitioner.
Testimony of the psychologist (as an expert witness).
Testimony of corroborating witnesses (friends/family who witnessed the marital strife).

Step 5: Decision and Entry of Judgment

If the judge grants the petition, a Decision is issued. After a 15-day period (if no motion for reconsideration is filed), the court issues an Entry of Judgment, making the decision final.

4. Documentary Requirements

You will need to gather the following "legal ammunition" before filing:

PSA Marriage Contract (Certified True Copy).
PSA Birth Certificates of any children.
Barangay Certificate of Residency (to prove venue).
Evidence of Grounds (e.g., medical records, police reports, or affidavits).
Inventory of Assets (if there is property to be divided).

5. The Financial and Temporal Reality

Filing for annulment is a significant investment of both time and money.

Aspect	Estimated Range
Duration	2 to 5 years (depending on court docket backlogs)
Legal Fees	₱150,000 to ₱500,000+ (depending on the lawyer’s expertise)
Expert Witness Fees	₱30,000 to ₱80,000
Filing/Court Fees	₱10,000 to ₱20,000 (varies by property value)

6. Effects of a Final Decree

Once the decree is registered with the Civil Registrar:

Status: You are legally single and may remarry.
Property: The community property or conjugal partnership is liquidated and divided.
Children: The court will rule on custody, visitation rights, and monthly support. Children of annulled marriages (Article 45) are generally considered legitimate, while the status of children in "void" marriages depends on the specific ground used.
Surname: A woman may revert to her maiden name once the decree is annotated on her marriage certificate.

Note: Even after a civil annulment is granted, the Catholic Church does not recognize it. If you wish to remarry within the Church, you must undergo a separate Canonical Annulment through the Marriage Tribunal.