Florida sets no single deadline for annulling a marriage — the time you have depends on why the marriage was invalid in the first place. Marriages that Florida treats as automatically void, such as bigamous or incestuous ones, can be challenged at any point with no time limit. Marriages that are merely voidable, based on grounds like fraud, duress, or mental incapacity, must be challenged within a “reasonable time” after you discover the defect or become free to act on it. That reasonable-time standard is the answer to how long you have to annul a marriage in Florida for almost every case that isn’t bigamy or incest, and Florida judges apply it flexibly based on the circumstances.
Void Marriages Have No Deadline
Two categories of marriage are considered so fundamentally invalid that Florida treats them as though they never legally existed. You can petition to have one declared void at any point, no matter how much time has passed.
- Bigamy. A marriage entered while one spouse was already legally married to someone else. Florida treats bigamy as a third-degree felony, and the later marriage is automatically void.1Florida Senate. Florida Code 826.01 – Bigamy; Punishment
- Incest. A marriage between close blood relatives, including direct lineage (parent-child, grandparent-grandchild), siblings, aunts and nephews, and uncles and nieces.2Florida Senate. Florida Code 741.21 – Incestuous Marriages Prohibited
No court order is technically required to invalidate a void marriage, but getting one still matters. A formal annulment judgment creates a clear legal record that protects you if questions come up later about property, insurance benefits, or inheritance.
Voidable Marriages and the Reasonable Time Rule
Most annulment cases in Florida involve voidable marriages. These are legally valid until a court says otherwise. Florida has no annulment statute, so judges apply common law principles built up through decades of case decisions. The rule those decisions share: you must file within a reasonable time after you discover the problem or become free to act on it.
There’s no fixed number of days or months that qualifies as reasonable. Judges look at how long you waited, why you waited, and whether you kept living as a married couple after learning the truth. The clock also starts at a different moment depending on the ground you’re relying on.
Fraud or Misrepresentation
Fraud is the most common annulment ground in Florida. The deception must go to the core of the marriage, not to something incidental. Courts have accepted grounds like concealing a serious criminal history, hiding an inability to have children, lying about intending to live together, and concealing a substance abuse problem. The clock begins when you discover the fraud, not when you married. Filing within weeks or a few months of discovery puts you in the strongest position. Waiting a year or more while continuing to live together makes judges skeptical.
Duress or Coercion
If you were forced or threatened into the marriage, the clock starts once you’re free from the coercive situation. Filing within a few months of getting free reads very differently to a judge than waiting years.
Mental Incapacity
When a person lacked the mental ability to understand what marriage means at the time of the ceremony, the reasonable-time window opens once they regain capacity. This covers severe intoxication, drug impairment, cognitive disabilities, and conditions like dementia. A guardian or family member can petition on behalf of someone who remains incapacitated.
Undisclosed Impotence
If one spouse is permanently unable to have sexual relations and concealed that fact before the wedding, the other spouse can seek annulment. As with fraud, the clock runs from the point of discovery.
Underage Marriage
Florida generally requires both parties to be at least 18. A 17-year-old can marry only with written parental consent, and only if the older party is no more than two years older. No one under 17 can legally marry in Florida.3Florida Senate. Florida Code 741.04 – Issuance of Marriage License If an underage marriage occurred without proper consent, the minor or their parent should file for annulment before or shortly after the minor turns 18. Continuing to live in the marriage past 18 is likely to be treated as ratification.
How Ratification Ends Your Window
Ratification is where most voidable annulment cases fall apart, and it’s the reason the reasonable-time rule has real teeth. Ratification means you learned about the defect and kept acting like you were married anyway. If you discover your spouse lied about a major issue but keep living together for another two years, sharing finances, and holding yourselves out as a couple, a Florida judge will almost certainly conclude you accepted the marriage despite the defect.
Ratification applies only to voidable marriages. You cannot ratify a void marriage, because there was never a valid marriage to accept. For every other ground, the longer you wait and the more you participate in the marriage after learning the truth, the weaker your case becomes. The practical takeaway: if you discover a basis for annulment, act quickly, and stop cohabitating.
If Too Much Time Has Passed
If a judge denies your annulment petition because too much time passed or ratification occurred, you can still file for divorce. Florida is a no-fault divorce state, so you only need to show the marriage is irretrievably broken without proving anyone did anything wrong. Divorce also gives you access to protections annulment doesn’t, including equitable distribution of assets and debts and potential alimony. For many people in longer marriages where annulment grounds exist but time has passed, divorce ends up being the more practical route.
One boundary worth flagging: none of these timing rules affect children born during the marriage. Children of an annulled marriage remain legitimate under Florida law, and custody, visitation, and child support are handled the same way they would be in a divorce, regardless of when the annulment is filed.