There is no fixed number of years that answers how long you can be married and still get an annulment. It depends on two things: the legal ground you’re using and the state you file in. Marriages the law treats as void from the start, such as bigamy or incest, can be challenged at any point, no matter how much time has passed. Marriages that are merely voidable, meaning valid until a court says otherwise, come with deadlines that range from about 90 days to several years. And in most of those cases, the clock doesn’t start on your wedding day. It starts when you found out about the problem.
Void Marriages Have No Time Limit
The first question isn’t how long you’ve been married. It’s whether your marriage is void or voidable, because that determines whether a deadline applies to you at all.
A void marriage is one the law treats as though it never happened. Bigamy, where one spouse was already legally married to someone else, and incest, where the spouses are close blood relatives, are the two clearest examples. These marriages are invalid from the start and don’t require a court order to be undone. You can seek a decree of nullity years or even decades later. Getting a formal court decree is still worth doing because it creates an official record and resolves property and custody questions, but no statute of limitations bars you from filing.
A voidable marriage looks valid on paper and stays valid unless someone goes to court and gets it annulled within the allowed window. Fraud, duress, mental incapacity, underage marriage, and inability to consummate all make a marriage voidable rather than void. This is where time limits actually matter, and where missing the deadline leaves divorce as your only option.
Deadlines by Ground
Each ground for annulment carries its own window, and states set their own numbers. The patterns below are the ones that recur across jurisdictions.
Fraud
Fraud is the most commonly claimed ground. It covers situations where one spouse lied about or concealed something fundamental to the marriage: marrying solely for immigration status, hiding an inability to have children, or concealing a serious criminal history. Lies about income or age generally don’t qualify because they aren’t considered to go to the heart of the relationship.
The deadline typically runs from the date you discover the deception, not from the wedding. Some states allow as little as 90 days after discovery; others give up to four years. The window is short in some places, so once you know, you need to move.
Mental Incapacity
If one spouse couldn’t understand what marriage meant at the time of the ceremony because of severe intoxication, mental illness, or cognitive disability, the marriage can be annulled. The incapacity has to have existed during the ceremony itself. Being drunk at the reception doesn’t count if you were sober when you exchanged vows.
The filing window generally opens once the incapacitated person regains capacity or a legal guardian recognizes the situation. Deadlines vary by state, but the expectation is the same as with fraud: file promptly once the issue is understood.
Duress or Forced Consent
When someone is coerced into marriage through threats, physical force, or extreme pressure that overrides free will, the marriage is voidable. The deadline to file starts when the coercion ends, not when the wedding happened. Someone who escapes a controlling situation years after the ceremony can still have a viable claim; the clock begins the moment they’re free to act.
Underage Marriage
If one or both spouses were below the legal age of consent at the time of the wedding, an annulment is available. Eighteen is the threshold in most states. In many jurisdictions, the window closes once the underage spouse reaches legal age and continues living with their partner. Depending on the state, a parent, guardian, or the underage spouse can bring the petition.
Inability to Consummate
If one spouse has a permanent, incurable physical condition that prevents sexual intercourse, and the other spouse didn’t know before the wedding, the marriage can be annulled. Filing windows for this ground generally run from one to five years from the date of marriage, depending on the state. Notice that this is one of the few grounds where the clock runs from the wedding itself rather than from discovery.
Bigamy and Incest
These are the void categories mentioned earlier. No statute of limitations applies. You still have to prove the underlying facts: for bigamy, that the prior marriage existed and was never legally dissolved; for incest, the family relationship. But you can bring the case at any time.
When the Clock Actually Starts
The single most misunderstood piece of annulment timing is when the deadline begins. For most voidable grounds, the statute of limitations does not start on the wedding day. It starts when the affected spouse discovers the problem, or when a reasonable person in their position should have discovered it.
This is the discovery rule, and it exists because several grounds for annulment involve hidden facts by definition. A spouse who committed fraud went to considerable lengths to conceal something; letting the deadline expire before the deceived spouse could learn the truth would defeat the purpose of the rule. The same reasoning applies to mental incapacity: someone too impaired to consent to marriage was also too impaired to know they needed to file legal papers.
The tradeoff is that courts expect reasonable diligence. If the warning signs were obvious and you looked past them for years, a judge can find that you “should have known” much earlier than you claim, and that your deadline has already run. So the practical answer to “how long can I be married and still get an annulment” is often less about calendar years and more about how long ago you learned what you now want to challenge.
How You Can Lose the Right to Annul
Deadlines are only half the picture. The other half is ratification, and it’s where most annulment cases fall apart.
Ratification means that through your own conduct, you accepted a marriage you could have challenged, and a court will now treat it as valid regardless of the original defect. The most common form is continued cohabitation. If you discover that your spouse committed fraud but keep living together, sharing a home, and functioning as a married couple, the court reads that as forgiveness. Once you’ve ratified the marriage, annulment is off the table even if the underlying ground was legitimate.
Ratification applies across virtually every voidable ground. A spouse who was coerced but stays voluntarily after the coercion ends has ratified. A spouse who was underage but continues cohabiting after turning 18 has ratified. The principle is the same throughout: if you had the ability to leave and chose not to, the law treats that as acceptance.
The practical advice is blunt. The moment you discover a ground for annulment, stop living as a married couple, and talk to a lawyer before doing anything that could be read as acceptance. Waiting to “think it over” while still sharing a bedroom can end your case before it starts.
Why Length of Marriage Still Matters, Even Within the Deadline
Eligibility isn’t the only question. Even when you can still file, annulment produces very different financial outcomes than divorce, and those differences grow more consequential the longer the marriage lasted.
Because an annulment declares that no valid marriage ever existed, courts generally won’t divide assets the way they would in a divorce. Each person keeps what they brought in and what’s titled in their name. Spousal support after annulment is rare for the same reason. Some states soften this through the putative spouse doctrine, which can extend divorce-like property protections to a spouse who entered the marriage in good faith, but the protections aren’t automatic.
Social Security is the sharpest example. A divorced spouse who was married for at least 10 years can collect benefits based on their ex-spouse’s earnings record.1Social Security Administration. SSA Handbook 1853 – Reinstatement of Benefits When Marriage Terminates An annulled spouse cannot, because the marriage is treated as never having happened. A 12-year marriage that ends in divorce can produce divorced-spouse benefits worth tens of thousands of dollars over a lifetime. The same 12-year marriage ending in annulment produces none. For anyone in a long marriage with limited work history of their own, this alone can be reason to choose divorce even when annulment is technically available.
The tax side follows the same logic. Because the IRS treats an annulled marriage as though it never existed, joint returns filed during the marriage are considered incorrect and generally need to be amended, subject to the IRS’s three-year window for filing amendments.2Internal Revenue Service. Publication 501, Dependents, Standard Deduction, and Filing Information Depending on each spouse’s income, that can produce refunds or additional tax owed.
One thing annulment does not do is affect the status of children. Children born during a marriage that is later annulled are legitimate under state law, and courts retain full authority over custody, visitation, and support in annulment cases just as they would in a divorce.
What to Do If You Think You Qualify
Before assuming you’re inside a deadline, pin down three things. First, is your ground void or voidable? Void grounds have no deadline. Second, if it’s voidable, when did you actually discover the problem, and what have you done since then? That date, not the wedding date, is usually what governs. Third, have you continued living as a married couple after the discovery? If so, you may already have ratified the marriage without realizing it.
State laws vary enough that a specific window in one jurisdiction can be twice as long in another. If you’re anywhere near the edge of a possible deadline, talk to a family law attorney in your state before you take any step that could be read as accepting the marriage.