Annulment of Marriage in Idaho

Part of my Idaho Family Law Overview.

By Ronald W. Brilliant, Attorney at Law · Licensed in Idaho, Nevada & California · Last reviewed: September 2026 against the Idaho Code as posted by the Idaho Legislature (July 1, 2026)

In This TopicIdaho Family LawTopic 2 of 9: Annulment

An annulment is a court judgment that a marriage is null. The Idaho Code calls it a “decree of nullity of marriage” (Idaho Code § 32-502). A marriage may be annulled only for one of six causes listed in the statute, and the cause must have existed at the time of the marriage (§ 32-501).

This page explains the six grounds, who may bring an annulment case, the time limits for each ground, and what the law says about children and property. It matters to anyone who believes their marriage was flawed from the start, and to parents or guardians of someone who married underage.

Annulment Compared With Divorce

A divorce is granted for one of the causes listed in section 32-603, such as irreconcilable differences, and it restores the parties to the state of unmarried persons (Idaho Code §§ 32-603, 32-602). An annulment, by contrast, rests on a cause that existed when the couple married (§ 32-501).

The grounds, deadlines, and parties who may sue are different for each (compare Idaho Code §§ 32-501, 32-502 with §§ 32-603, 32-615). See the divorce page for the divorce rules.

The Six Grounds for Annulment

A marriage may be annulled for any of these causes, if it existed at the time of the marriage (Idaho Code § 32-501):

1. Underage without consent. The person seeking the annulment was under the age of legal consent, and the marriage took place without the consent of that person’s parents, guardian, or persons having charge of him or her (§ 32-501(1)).
2. An earlier spouse was living. The former husband or wife of either party was living, and that earlier marriage was still in force (§ 32-501(2)).
3. Unsound mind. Either party was of unsound mind (§ 32-501(3)).
4. Fraud. Either party’s consent was obtained by fraud (§ 32-501(4)).
5. Force. Either party’s consent was obtained by force (§ 32-501(5)).
6. Physical incapacity. Either party was, at the time of marriage, physically incapable of entering into the married state, and the incapacity continues and appears to be incurable (§ 32-501(6)).

When Living Together Can Defeat a Ground

For four of the grounds, the statute says the marriage cannot be annulled if the affected person later “freely cohabited” with the other spouse as husband or wife (Idaho Code § 32-501). To cohabit means to live together. The conditions differ by ground:

• Underage: the ground is lost if, after reaching the age of consent, the party freely cohabits with the other as husband or wife for any time (§ 32-501(1)).
• Unsound mind: the ground is lost if the party, after coming to reason, freely cohabited with the other as husband or wife (§ 32-501(3)).
• Fraud: the ground is lost if the party afterward freely cohabited with the other as husband or wife with full knowledge of the facts constituting the fraud (§ 32-501(4)).
• Force: the ground is lost if the party afterward freely cohabited with the other as husband or wife (§ 32-501(5)).

The statute does not include a cohabitation exception for the earlier-spouse ground or the physical-incapacity ground (Idaho Code § 32-501(2), (6)).

Who May File and the Deadlines

An annulment action must be started within the time periods, and by the parties, set out in Idaho Code § 32-502. The statute says the action “must be commenced” within those periods and by those parties (§ 32-502).

Ground	Who may file	Deadline	Citation
Underage without consent	The party who married under the age of legal consent	Within 4 years after reaching the age of consent	§ 32-502(1)
Underage without consent	A parent, guardian, or other person having charge of the underage party	Any time before the married minor reaches the age of legal consent	§ 32-502(1)
Earlier spouse living	Either party, or the former husband or wife	Either party: during the life of the other. The statute states no separate time limit for the former spouse.	§ 32-502(2)
Unsound mind	The party injured, or a relative or guardian of the party of unsound mind	Any time before the death of either party	§ 32-502(3)
Fraud	The party injured	Within 4 years after discovering the facts constituting the fraud	§ 32-502(4)
Force	The injured party	Within 4 years after the marriage	§ 32-502(5)
Physical incapacity	The injured party	Within 4 years after the marriage	§ 32-502(6)

Notice how the deadlines are counted. For fraud, the four years run from the discovery of the facts, not from the wedding (Idaho Code § 32-502(4)). For force and physical incapacity, the four years run from the marriage itself (§ 32-502(5), (6)).

Chapter 5 of Title 32 uses the phrase “age of legal consent” but does not itself define it (Idaho Code §§ 32-501, 32-502). The rules on the age at which a person may marry, with or without a parent’s consent, are in section 32-202 and are explained on the marriage page.

Void Marriages and Bigamy

Some marriages are described in the Idaho Code as void from the beginning. These include incestuous marriages, such as between a parent and child or between siblings (Idaho Code § 32-205), and, with limited exceptions, a marriage entered into while a former spouse is still living (§ 32-207). On and after January 1, 1996, any marriage entered into in violation of Title 32 is void (§ 32-301).

The bigamy statute has exceptions. A later marriage is not void from the beginning if the earlier marriage had been annulled or dissolved, or if the earlier spouse had been absent and not known to be living for five successive years, or was generally reputed and believed to be dead, when the later marriage took place (Idaho Code § 32-207). In those cases, the later marriage is valid until its nullity is adjudged by a competent tribunal (§ 32-207).

An annulment action on the earlier-spouse ground may be brought by either party during the life of the other, or by the former husband or wife (Idaho Code § 32-502(2)).

Children of an Annulled Marriage

When a marriage is annulled, children begotten before the judgment are legitimate and succeed to the state of both parents (Idaho Code § 32-503). The one exception in the statute is an annulment for fraud in that the wife is pregnant with the child of a man other than the husband (§ 32-503).

The court may, when it grants the annulment or at any later time, make necessary orders for the support of the children as the parents’ circumstances require (Idaho Code § 32-503). The child support page covers support rules more broadly.

If a marriage is annulled on the ground of fraud or force, the court must award custody of the children to the innocent parent (Idaho Code § 32-504). The court may also provide for the children’s education and maintenance out of the property of the guilty party (§ 32-504). For custody in other situations, see the child custody page.

Premarital Agreements and Void Marriages

A couple may have signed a premarital agreement before a marriage that turns out to be void. In that case, the agreement is enforceable only to the extent necessary to avoid an inequitable result (Idaho Code § 32-926). Property issues more generally are covered on the property division and maintenance page.

Who Is Bound by the Judgment

A judgment of nullity of marriage is conclusive only as against the parties to the action and those claiming under them (Idaho Code § 32-505). The statute does not make it conclusive against anyone else (§ 32-505).

Effect on a Will

An annulment can also change a will. If a person makes a will and the marriage is later annulled, the annulment revokes any disposition or appointment of property made by the will to the former spouse, and any nomination of the former spouse as executor, trustee, conservator, or guardian, unless the will expressly provides otherwise (Idaho Code § 15-2-508). The page on changing or revoking a will explains this rule.

How I Can Help

If you think your marriage may be void or subject to annulment, I can review the facts with you, identify which ground under Idaho Code § 32-501 may apply, and check the deadline that goes with it. I can also explain how an annulment compares with a divorce in your circumstances. Request a consultation to discuss your situation.

This page provides general information about Idaho family law, based on the Idaho Code, and is not legal advice. Court rules (including the Idaho Child Support Guidelines), regulations, and case law also affect family law matters. Every situation is different; consult an attorney about yours. Reading this page does not create an attorney-client relationship.