The doctrine of prejudicial question occupies a unique position in Philippine procedural law as the mechanism that harmonizes the parallel tracks of civil and criminal litigation when their outcomes are inextricably linked. In the specific intersection of concubinage prosecutions under the Revised Penal Code and petitions for declaration of nullity of marriage under the Family Code, the doctrine tests the boundaries between the State’s interest in punishing marital infidelity and the private right to seek judicial recognition that a marriage never legally existed. This article examines the full doctrinal, statutory, and jurisprudential landscape governing the topic.

I. The Legal Concept of Prejudicial Question

A prejudicial question is statutorily defined in Section 6, Rule 111 of the 2000 Revised Rules of Criminal Procedure:

“A petition for suspension of the criminal action by reason of prejudicial question may be filed when there is a previously instituted civil action involving an issue similar or intimately related to the issue raised in the criminal action, the resolution of which is determinative of whether or not the criminal action may proceed.”

Three indispensable requisites must concur:

The civil action must have been instituted prior to the filing of the criminal action.
The issue in the civil action must be intimately related or similar to the issue in the criminal case.
The resolution of the civil issue must be determinative of whether the criminal action may proceed—i.e., it goes to the very existence of an element of the crime.

The petition for suspension is not granted as a matter of right. The trial court exercises sound discretion after determining that the civil case is not a mere dilatory tactic. The motion must ordinarily be filed before arraignment; once the accused has entered a plea, the right to invoke the prejudicial question is generally waived.

II. Concubinage under the Revised Penal Code

Article 334 of the Revised Penal Code punishes concubinage as follows:

“Any husband who shall keep a mistress in the conjugal dwelling, or shall have sexual intercourse, under scandalous circumstances, with a woman who is not his wife, or shall cohabit with her in any other place, shall be punished by prision correccional in its minimum and medium periods.”

The essential elements are:

The offender is a married man;
He either (a) keeps a mistress in the conjugal dwelling, (b) has sexual relations with a woman who is not his wife under scandalous circumstances, or (c) cohabits with her in any other place.

The phrase “married man” imports the existence of a valid and subsisting marriage at the time the acts of concubinage were committed. If the marriage is void ab initio, the legal status of “husband” never attached, and the crime cannot be consummated. Adultery (Art. 333), the counterpart offense for wives, follows the same logic.

III. Declaration of Nullity of Marriage under the Family Code

The Family Code classifies marriages into three categories relevant to the present discussion:

Void ab initio marriages (Arts. 35, 36, 37, 38, 41, 52) – These never produced legal effects. Grounds include lack of legal capacity, lack of marriage license, bigamous or polygamous marriages (unless covered by Art. 41), incestuous relationships, and psychological incapacity under Article 36.
Voidable marriages (Art. 45) – These are valid until annulled by final judgment.
Presumptively valid marriages – All marriages enjoy the presumption of validity until a competent court declares otherwise.

Article 40 expressly requires a judicial declaration of nullity before a party may remarry if the first marriage is void. For purposes other than remarriage, however, the doctrine of retroactivity applies: a void marriage is deemed never to have existed from the beginning.

IV. The Core Issue: Does a Pending Nullity Petition Constitute a Prejudicial Question to a Concubinage Prosecution?

Philippine jurisprudence has answered this question with consistent restraint. The Supreme Court has repeatedly held that a petition for declaration of nullity of marriage does not, as a general rule, constitute a prejudicial question that warrants suspension of a concubinage (or adultery) case.

The leading doctrinal reasons are:

Presumption of Validity. A marriage celebrated in accordance with law is presumed valid until a court of competent jurisdiction declares its nullity. The accused cannot unilaterally treat the marriage as void and use that assumption to defeat a criminal prosecution.
Nature of the Element “Married Man”. While the existence of a valid marriage is an element of concubinage, the criminal court is competent to receive evidence on the validity of the marriage as an incidental issue. The pendency of a separate civil action does not divest the criminal court of its jurisdiction to determine that factual and legal question for the purpose of the criminal case.
Prevention of Dilatory Tactics. Allowing every concubinage case to be suspended by the simple expedient of filing a nullity petition would open the floodgates to harassment and delay, undermining the State’s interest in the speedy prosecution of crimes and the protection of the institution of marriage.
Distinction from Bigamy. The rule is different in bigamy prosecutions (Art. 349). In bigamy cases, the nullity of the first marriage directly determines whether the second marriage was contracted while the offender was still legally married. Even there, however, the Supreme Court has held in landmark rulings (e.g., Beltran v. People, Mercado v. Tan, Tenebro v. Court of Appeals) that the accused cannot contract a second marriage without first obtaining a judicial declaration of nullity of the first. Yet even in bigamy, suspension is not automatic; the criminal case may proceed, with the nullity issue litigated collaterally or the accused bearing the risk of conviction if the nullity case fails.

In concubinage and adultery, the distinction is sharper: the offender is not claiming to have entered a new marriage but is accused of maintaining an illicit relationship while still legally married. The criminal act does not depend on the validity of a subsequent union but on the status at the time of the cohabitation or scandalous intercourse.

V. Procedural Mechanics and Requirements

To invoke the prejudicial-question rule in a concubinage case:

The nullity petition must precede the filing of the criminal complaint or information.
The accused must file a verified petition for suspension in the criminal court, annexing certified true copies of the civil complaint and relevant pleadings.
The petition must demonstrate that the nullity case is bona fide and not interposed merely to delay the criminal proceedings. Courts examine the merits of the nullity grounds alleged.
The criminal court may deny suspension if the nullity case appears sham or if the issues are not intimately related in the determinative sense required by the Rules.

If the nullity petition is granted after the commission of the alleged concubinage but before final judgment in the criminal case, the effect depends on the nature of the nullity:

Void ab initio (retroactive effect) – The marriage is deemed never to have existed; the element “married man” is absent; acquittal or dismissal follows.
Voidable (prospective effect only) – The marriage remains valid until the decree of annulment; concubinage liability attaches.

VI. Policy Considerations and Practical Implications

The prevailing rule serves several policy ends:

Protection of the Marital Institution. Philippine law continues to regard marriage as the foundation of the family and a social institution. Allowing criminal liability to evaporate upon a later nullity declaration would weaken this policy.
Speedy Justice. Criminal prosecutions for concubinage often involve vulnerable parties (the offended spouse and children). Prolonged suspension prejudices their rights.
Judicial Economy. Criminal courts are not powerless to receive evidence on the validity of marriage. Expert testimony, documentary evidence, and collateral attack on the marriage’s validity remain available to the accused.
Double Jeopardy Safeguards. If a concubinage case ends in acquittal because the prosecution failed to prove the marriage beyond reasonable doubt, a later nullity decree does not reopen the criminal case. Conversely, if the accused is convicted and the marriage is later declared void, the remedy lies in a petition for new trial or reversal on appeal, provided the nullity decree was not available earlier.

Practitioners must advise clients that filing a nullity petition simultaneously with, or after, the criminal information almost never succeeds as a prejudicial question. The safer strategic course is to vigorously litigate the nullity case first, present overwhelming evidence of nullity, and only then use a favorable interlocutory or final judgment in the nullity case to move for dismissal or acquittal in the criminal proceeding on the ground that the element of a valid marriage no longer exists.

VII. Related Offenses and Analogous Situations

The same principles apply to adultery prosecutions. The offended husband in an adultery case cannot be compelled to await the outcome of a nullity petition filed by the wife and her paramour.

In bigamy cases, although the nullity of the first marriage is more directly determinative, the Supreme Court has still refused automatic suspension unless the requisites of Rule 111 are strictly met and the civil case was instituted first.

Conclusion

The doctrine of prejudicial question, while doctrinally sound and protective of substantive rights, is narrowly applied in concubinage and nullity of marriage cases. Philippine courts have struck a balance that upholds the presumption of the validity of marriage, prevents forum-shopping and delay, and preserves the criminal court’s authority to resolve the factual issue of marital status for the purpose of determining criminal liability. Only in the rarest of circumstances—where a prior, manifestly meritorious nullity action is pending and its resolution is truly determinative—will suspension be granted. In all other cases, the criminal prosecution proceeds, leaving the accused to prove the nullity of the marriage either as a defense or in a separate civil action whose outcome may later support post-conviction relief. This calibrated approach remains the settled law and practice in the Philippines.