To qualify for an annulment, you have to prove that your marriage was legally defective from the moment it began, fit that defect into one of the grounds your state recognizes, and file before the deadline runs out. That is the short version of how to qualify for an annulment, and it is where most cases are won or lost. A divorce ends a valid marriage. An annulment is a court order declaring that no valid marriage ever existed, and courts do not grant that lightly.
Void or Voidable: Which One Is Your Marriage?
Before you look at grounds, figure out which category your situation falls into, because the rules that follow depend on it.
A void marriage is one the law treats as never having been legal. Bigamy and incest are the two main examples. If your spouse was already married to someone else on your wedding day, the second marriage is void regardless of what anyone does about it. The same is true for marriages between close blood relatives. A court order is not strictly required to make a void marriage invalid, but most people still get a formal decree so they have official proof of their single status for future marriage licenses, benefits, and property matters.
A voidable marriage is legally valid until one spouse successfully asks a court to annul it. Fraud, duress, underage marriage, and mental or physical incapacity all sit here. If you never challenge a voidable marriage, it stands. You also face filing deadlines, and your own conduct after the wedding can cost you the right to annul. Neither of those risks applies to void marriages.
Grounds That Qualify for an Annulment
Every state writes its own annulment statute, but the recognized grounds overlap heavily. If your circumstances don’t fit one of the categories below, an annulment probably isn’t available to you, and divorce is the path.
Bigamy
If either spouse was already legally married to someone else at the time of the ceremony, the second marriage is void. This is the most straightforward ground because you don’t have to prove intent or state of mind. The first marriage simply needs to have been valid and undissolved, and a certified copy of the prior marriage certificate is usually enough.
Incest
Marriages between close blood relatives are void in every state. Parent-child, sibling, and aunt/uncle-niece/nephew relationships are universally prohibited. First cousins are more complicated: roughly half the states ban those marriages outright, and the rest allow them either unconditionally or with restrictions such as age requirements or genetic counseling. Whether a cousin marriage qualifies for annulment depends on where it was performed and where the couple lives.
Underage Marriage
If one spouse was below the legal age to marry and did not have the required parental or judicial consent, the marriage is voidable. Most states set the minimum at 18 without parental consent, though the age threshold with parental permission varies. The underage spouse, or a parent or guardian, is typically the one who has to file, and the deadline usually expires once the younger spouse reaches the age at which they could have married without the missing consent.
Mental Incapacity
Marriage requires that both people understand what they are agreeing to. If one spouse could not comprehend the nature of the ceremony because of mental illness, cognitive disability, or the effects of alcohol or drugs, the marriage is voidable. The incapacity must have existed at the moment of the ceremony. Getting drunk at the reception does not count. Being so impaired during the vows that you did not understand you were getting married does.
Fraud
Fraud is the most litigated ground, and the hardest to win. Courts do not treat marriage fraud the way they treat fraud in a regular contract dispute. The deception has to go to what courts call the “essentials of marriage.” Traditionally that means misrepresentations about sex or the ability to have children. Hiding infertility, hiding a pregnancy by someone else, or marrying solely to obtain immigration status has historically met the bar. Lying about wealth, drinking habits, criminal history, or personality generally has not. As one court put it, discovering that your spouse is “a lazy, unshaven disappointment with a drinking problem” is what divorce is for, not annulment.
Some states have expanded the fraud standard beyond the traditional sex-and-procreation test, but the bar remains high everywhere. You also have to show you would not have married the person if you had known the truth. If you discovered the lie and stayed anyway, a judge is unlikely to grant the annulment.
Duress or Force
If one spouse only agreed to the marriage because of threats, physical violence, or extreme coercion, the marriage is voidable. The pressure has to be serious enough that a reasonable person in the same situation would have felt they had no real choice. General family pressure or cultural expectations, however heavy they feel personally, rarely meet the legal threshold.
Physical Incapacity
If one spouse is permanently unable to have sexual intercourse and the other spouse did not know about the condition before the wedding, the marriage is voidable. This ground is about the inability to consummate, not infertility or the inability to have children. The condition generally must be incurable, and the petitioner must not have known about it at the time of the ceremony.
Deadlines That Can Disqualify You
Filing windows are where viable annulment claims quietly die. Void marriages can usually be challenged at any time. Voidable marriages come with deadlines that vary by ground and by state, and if you miss yours, divorce becomes your only option no matter how strong your case is.
Under the model act that shaped many state statutes, the general patterns look like this:
- Mental incapacity, fraud, or duress: file within a set period after you discover, or should have discovered, the problem. Some states give you 90 days from discovery; others allow up to four years from the date of the marriage.
- Physical incapacity: typically one to four years after you learn of the condition.
- Underage marriage: the minor spouse generally must file before reaching the age at which they could have married without the missing consent, or within a few years of reaching that age.
- Bigamy or incest: no deadline in most states, because these marriages are void rather than voidable. Either spouse, and sometimes a third party such as the legal first spouse, can bring the challenge.
These are patterns, not your statute. Check your state’s rule early. Waiting “just a little longer” is how people lose viable annulment claims.
How Living Together After Discovery Can Waive Your Right
Even with solid grounds and time on the clock, your own behavior after the wedding can waive your right to file. Lawyers call this ratification, and it catches more people off guard than almost any other part of annulment law.
Ratification happens when you continue living with your spouse as a married couple after you learn about the defect. Discover the fraud six months in and stay another year hoping things improve, and a court will likely find you accepted the marriage despite its flaws. The same logic applies to an underage spouse who keeps living with their partner after turning 18, or someone who sobers up and continues the relationship after an intoxicated ceremony. If you knew about the problem and chose to stay, you validated the marriage through your actions, and once a court finds ratification, divorce is your only exit.
Void marriages are the exception. You cannot ratify a bigamous or incestuous marriage no matter how long you live together, because the law treats those unions as something that can never become valid.
Proving Your Case
Qualifying on paper is not the same as winning. Even when both spouses agree the marriage should be annulled, the court will not rubber-stamp the petition. The judge has to be satisfied that the legal standard is met, and the burden of proof sits entirely on the person asking for the annulment.
The evidence that matters depends on your ground. A certified copy of a prior marriage certificate may be all you need for bigamy. Fraud and duress cases are harder and usually require witness testimony, text messages, emails, financial records, or other documentation showing the deception or coercion. If your ground involves mental incapacity or intoxication, medical or psychological evaluations from around the time of the ceremony carry significant weight, and witness testimony from people who saw your spouse’s condition can help.
Courts in some states apply a preponderance-of-the-evidence standard (more likely than not). Others require clear and convincing evidence, which is a higher bar. Either way, vague allegations will not get you there. Judges want specific, documented facts showing that the marriage was defective from the start.
Religious Annulments Are a Separate Thing
Many people looking into annulment are actually thinking about a religious annulment, most often a Catholic one. A religious annulment and a civil annulment are entirely separate proceedings with no overlap in legal effect. A church annulment declares that a valid sacramental marriage never existed in the eyes of that faith and lets a person remarry within their religious tradition. It has no legal standing. It does not change your marital status with the government, does not affect property rights, and does not touch custody or support. A civil annulment, in the same way, has no bearing on your standing within a religious institution. If you need both, you have to pursue them separately.
If You Don’t Qualify
Annulment petitions fail. The judge may find the evidence does not support your ground, that you filed too late, or that you ratified the marriage. If that happens, the marriage remains valid, but you have not lost the ability to end it. Divorce is always available, and in every state that offers no-fault divorce, you do not have to prove any particular wrongdoing to get one. Some attorneys recommend filing for divorce as a backup alongside the annulment, or converting to a divorce if the annulment claim starts to look weak in litigation. The question worth asking early is whether the difference between “never married” and “divorced” matters enough to your situation to justify the higher evidentiary burden that annulment carries.