The grounds for annulment of a marriage fall into two groups: grounds that make a marriage void from the moment of the ceremony, and grounds that make it voidable. Bigamy and incest are the void grounds, treated by the law as if the marriage never existed. Fraud, duress, underage marriage, mental incapacity, and permanent inability to consummate are voidable grounds, meaning the marriage stands as legally valid until a court says otherwise. Which category your situation falls into controls what you have to prove, how long you have to file, and whether you technically need a court order at all.
Void Grounds and Voidable Grounds
A void marriage is one the law considers nonexistent from day one. You don’t strictly need a court order to be free of it, but a formal annulment decree creates an official record and avoids future problems with government agencies, creditors, and benefits programs. Void marriages can usually be challenged at any time.
A voidable marriage is legally valid until a judge declares otherwise. If you never go to court, the marriage stands. Voidable grounds also come with filing deadlines, and continuing to live as a married couple after you learn of the defect can be treated as ratification, which kills the annulment claim.
Bigamy
Marrying someone who is already legally married to another person makes the second marriage void. The question is binary: either a valid prior marriage existed at the time of the ceremony or it didn’t. Proof usually comes down to marriage certificates, divorce decrees, or death certificates showing whether the earlier marriage was ever dissolved.
Bigamy is also a criminal offense in every state. Some states classify it as a misdemeanor; others treat it as a felony carrying several years in prison. The criminal case is separate from the annulment, but discovering bigamy often triggers both.
If you genuinely believed your spouse’s prior marriage had ended, you may qualify as a “putative spouse,” which can preserve certain property and benefit rights even after the marriage is annulled. The Social Security Administration recognizes putative marriages when a party held a good-faith belief in the marriage’s validity from its beginning through either the spouse’s death or a final divorce.1Social Security Administration. Putative Marriage (POMS GN 00305.085)
Incest
A marriage between close blood relatives is void everywhere in the United States. The prohibited relationships universally include parent and child, siblings, half-siblings, grandparent and grandchild, and aunt or uncle with niece or nephew. First cousins are the one area that isn’t uniform: roughly half the states ban first-cousin marriages, and others allow them with conditions or without any restriction.
Proof usually consists of birth certificates, family records, or DNA evidence establishing the biological relationship. As with bigamy, the marriage is void from inception, so no court order is strictly necessary, though obtaining one creates a clean legal record.
Fraud
Fraud makes a marriage voidable when one spouse was deceived about something fundamental to the marriage itself. Not every lie qualifies. Misrepresenting income or exaggerating career prospects almost certainly won’t support an annulment. Concealing an inability to have children, hiding a serious criminal history, or marrying solely to obtain immigration benefits often will. The deception has to go to the core of what marriage means, and courts draw that line case by case.
The defrauded spouse typically has to show they relied on the false representation when deciding to marry and would not have gone through with the wedding had they known the truth. Evidence often includes text messages, emails, financial records, or testimony from people who knew about the deception.
Duress and Coercion
Duress involves threats or violence that forced someone into a marriage against their will. Threats don’t have to be directed at the person who married; threats against family members count. Courts look at whether the pressure was severe enough that a reasonable person in the same situation would have felt they had no real choice.
Undue influence is a related ground that shows up in relationships with significant power imbalances, such as a caregiver and a dependent or an authority figure and a subordinate. The question is whether one person exploited a position of trust to manipulate the other into agreeing to marry. Undue influence is harder to prove than outright threats because the pressure is subtler, and courts examine the totality of the relationship.
Both duress and undue influence produce voidable marriages. The pressured spouse must actually file. If they continue living as a married couple after the pressure ends, a court may find they ratified the marriage, which ends the annulment claim.
Underage Marriage
Every state sets a general minimum marriage age, which is 18 in all but two states: Nebraska sets it at 19 and Mississippi at 21. Most states allow exceptions for minors with parental consent, a judge’s approval, or both. A common exception permits marriage as young as 15 with parental consent, and some states allow marriages even younger under circumstances like pregnancy or emancipation.
When a minor marries without the required consent or judicial approval, the marriage is voidable. The minor, or a parent or guardian, can petition for annulment. The window for filing often closes once the underage spouse reaches the age of majority and continues living in the marriage, since that voluntary continuation can be treated as ratification.
Mental Incapacity
If one spouse lacked the mental capacity to understand what marriage means at the time of the ceremony, the marriage is voidable. This covers severe mental illness, developmental disabilities, advanced dementia, and brain injuries that impaired judgment at the critical moment.
Temporary impairment counts too. Extreme intoxication from alcohol or drugs at the time of the ceremony can support an annulment, but the bar is high. A few drinks before the vows won’t do it. The intoxication must have been severe enough that the person genuinely could not appreciate what they were doing. Incapacitation, not just impaired judgment.
Proof usually requires medical records, psychiatric evaluations, or testimony from people who observed the person’s condition around the time of the ceremony. For substance-related claims, hospital records, toxicology results, or video footage from the event can be persuasive.
Inability To Consummate the Marriage
If one spouse was physically unable to have sexual intercourse at the time of the marriage and the condition is permanent, the other spouse can seek an annulment. The inability must have existed at the time of the marriage rather than developed later, and courts distinguish between inability and unwillingness. A spouse who simply refuses to have sex has not given you grounds.
Medical evidence is almost always required. The petitioner has to show the condition existed when the marriage began and that it can’t be cured. Some jurisdictions also require that the petitioner didn’t know about the condition before the marriage. This ground has a notably short filing window in many states, often requiring action within the first few years of marriage.
Time Limits for Filing
Deadlines are where annulment cases most often fall apart. Void marriages (bigamy and incest) can generally be challenged at any time, since the marriage was never valid to begin with. Voidable marriages come with strict statutes of limitations that vary by state and by ground.
As a rough guide:
- Fraud-based annulments typically must be filed within a few years of discovering the deception.
- Underage marriage claims usually expire once the minor reaches adulthood and continues in the marriage.
- Mental incapacity claims often must be brought soon after the incapacitated person regains capacity.
- Inability to consummate may carry a deadline measured from the date of marriage itself.
The clock usually starts running when you discover, or should have discovered, the problem rather than from the wedding date. “Should have discovered” is doing real work in that sentence. Courts won’t be sympathetic if you ignored obvious red flags for years and then tried to claim fraud. Miss the deadline and divorce becomes your only option for ending the marriage.
Religious Annulment Is Separate
Many people searching for information about annulment are actually thinking about a religious annulment, particularly in the Catholic Church. These are entirely separate processes. A religious annulment is governed by church law and has no legal effect on your tax filing status, property rights, or legal marital status. A civil annulment granted by a court has no bearing on your standing within your faith. If you need both, you’ll go through two independent processes, and the civil one must typically be completed first.