No length of separation will ever annul a marriage. Whether you have lived apart for one year, ten, or thirty, the marriage stays legally intact until a court either ends it through divorce or declares it void through annulment. The question of how many years of separation are required before a marriage is annulled comes up often, but the premise is wrong: annulment has nothing to do with time apart. It depends entirely on whether something was legally defective about the marriage on the day it began.
Why Time Apart Doesn’t Annul a Marriage
Annulment and separation ask two different questions. Annulment looks backward to the wedding itself and asks whether the marriage was ever legally valid. Separation looks forward and describes what happened to the relationship afterward. Those two inquiries never meet. A couple can live in different states, different countries, or under the same roof without speaking, and none of it changes whether the marriage was valid when it was formed.
The confusion usually traces back to divorce law, where separation genuinely can matter. Several states allow a no-fault divorce after spouses have lived apart for a required period, ranging from as little as 60 days in Kentucky to five years in Idaho, with most states that impose a period landing somewhere between six months and 18 months.1Justia. Legal Separation in Divorce: 50-State Survey But even in those states, the outcome is a divorce, not an annulment. The marriage is treated as real and then dissolved. It is not erased.
That difference is not a technicality. A divorce leaves you formerly married. An annulment declares that in the eyes of the law, the marriage never happened at all. Property division, inheritance rights, and even how your prior tax returns are treated all flow from that distinction.
What It Actually Takes to Annul a Marriage
To get an annulment, you have to prove a specific legal defect that existed at the moment of the ceremony. The person seeking the annulment carries the burden, and courts hold that burden seriously. Annulments are harder to obtain than divorces because you are asking a judge to declare that something everyone treated as a marriage was never one.
The recognized grounds vary by state, but most jurisdictions accept some version of the following:
- Fraud or misrepresentation about something essential to the marriage, such as the ability or willingness to have children, a hidden criminal history, or a concealed serious health condition. Ordinary lies do not qualify; the deception has to go to the heart of why you agreed to marry.
- Duress or coercion, meaning one spouse was pushed into the marriage by threats or violence and never truly consented.
- Bigamy, where one spouse was already legally married to someone else on the wedding day.
- Incest, meaning the spouses are close blood relatives, which is prohibited in every state.
- Lack of mental capacity, whether from a mental health condition, intellectual disability, or intoxication, that prevented a spouse from understanding what they were agreeing to.
- Underage marriage, where one or both spouses were below the legal age and did not have the required parental or judicial consent.
Every one of these points back to something wrong at the ceremony. None of them turn on how long the couple stayed together, how long they have been apart, or how the relationship evolved. That is the heart of annulment law and the reason separation length is beside the point.
Void vs. Voidable Marriages
Some invalid marriages are treated as never having existed at all. Bigamous and incestuous marriages fall into this category and are considered void from the start. Technically no court order is needed to treat them as invalid, though obtaining a formal annulment decree is still worth doing to create a clean record of your marital status.
Other defective marriages are voidable, not void. Marriages based on fraud, duress, or lack of capacity are legally valid until someone successfully challenges them in court. If nobody ever files, the marriage stays in force with all the rights and obligations that come with it. That is where timing starts to matter, and where couples who assume the passage of time is helping them are usually mistaken.
Deadlines That Actually Do Apply
Annulments have their own filing windows, and these deadlines depend on the ground you are claiming. Missing the window does not force you to stay married, but it typically means divorce becomes your only exit.
For fraud, most states start the clock when the deception is discovered, not when the wedding took place. The filing window after discovery commonly runs between one and four years. For underage marriage, the deadline often begins when the younger spouse reaches the age of majority. Duress claims usually require filing within a reasonable time after the coercion ends.
Void marriages are the exception. Because bigamous and incestuous marriages were never valid to begin with, most states impose no time limit on seeking an annulment decree, and either spouse (and sometimes a third party such as a prosecutor) can bring the action at any point.
How Staying Together Can Cost You the Option
Time works against annulment in a way that surprises people. If you discover valid grounds and then continue living with your spouse as a married couple, a court can conclude you have accepted the marriage in spite of the defect. This is called ratification, and it is one of the most common reasons annulment petitions get denied.
Ratification applies to voidable marriages. You cannot ratify a bigamous marriage into validity no matter how long you stay. But for fraud, duress, underage marriage, and similar grounds, courts expect you to act promptly once you learn of the problem or once the impediment is removed. So while separation itself does not annul a marriage, delay after discovering the grounds can quietly eliminate the annulment option and leave divorce as your only route.
Where Separation Time Really Matters
Separation genuinely does matter in divorce, just not in annulment. Some states require spouses to live apart for a set period before granting a no-fault divorce, with required periods ranging from 60 days to several years depending on the state and on factors like whether minor children are involved.1Justia. Legal Separation in Divorce: 50-State Survey Most states, though, do not require any separation at all and will grant a divorce based on irreconcilable differences alone.
Some states also recognize a formal legal separation as its own status. A court can issue orders on custody, support, and property while the couple remains technically married. Couples sometimes use it to preserve health insurance or for religious reasons. A legal separation can usually be converted to a divorce later, but it never converts into or substitutes for an annulment. To remarry, you still need either a divorce or an annulment on valid grounds.
Religious Annulments Are Separate
One boundary worth flagging: a religious annulment, most commonly granted by the Catholic Church, has no effect on your legal marital status. It may allow you to remarry within your faith, but the state still considers you married. The reverse also holds — a civil annulment does not change your standing within a religious institution. If you need both, you have to pursue each process separately. Couples occasionally obtain a religious annulment and assume they are free to remarry legally, only to find out later they were still legally married the entire time.
If you are counting the years since you last lived with your spouse and hoping the calendar will do the work for you, it will not. The marriage is still a marriage. To end it you need a divorce, or, if a defect existed at the ceremony and you can still meet your state’s deadline, an annulment.