A divorce ends a marriage that was valid. An annulment is a court finding that the marriage was never valid in the first place. That single difference decides what you have to prove. A divorce needs no fault at all in Missouri or Kansas. An annulment needs you to show something was wrong on the day you married. Is a short marriage enough for an annulment? No. Length is not a ground in either state.
The first question is whether you qualify for an annulment at all. The grounds are narrow, and it is better to learn that in a first conversation than after months in court.
Divorce, annulment and legal separation, side by side
| Divorce | Annulment | Legal separation | |
|---|---|---|---|
| What it does | Ends a valid marriage | Declares the marriage was never valid | Keeps you married, with court orders on everything else |
| What you must prove | Nothing about fault | A defect present when you married | That the marriage may still be saved (Missouri) |
| Can you remarry? | Yes | Yes | No, not until it is converted to a divorce |
| Children | Custody and support ordered | Custody and support still ordered | Custody and support ordered |
| How often it fits | Almost always | Rarely | Occasionally, for a specific reason |
Kansas has the same third option under a different name, separate maintenance. More on that below.
What makes a marriage annullable
Courts split annullable marriages into two kinds.
Void marriages were never legal at all. In Missouri, one person already married to someone else voids the new marriage under Section 451.030, unless that earlier marriage was already dissolved. Section 451.020 covers close relatives: parents and children or grandparents and grandchildren of any degree, brothers and sisters whether full or half blood, and uncles with nieces, aunts with nephews, or first cousins. The same section voids a marriage where one person could not legally consent to it at all.
Voidable marriages were legal on paper but flawed at the start. The usual grounds: Missouri has no single statute listing them the way it does void marriages – these come from case law built up over time, not one section you can point to.
- Fraud about something essential to the marriage, not a white lie
- Duress, meaning real pressure or threats that forced the marriage
- Being underage without the consent the law requires
- A serious mistake about who or what you were agreeing to
What is not on the list matters just as much. A short marriage is not grounds. Regret is not grounds. Discovering after the wedding that you are incompatible is not grounds. Those are divorces.
The Kansas difference
Kansas puts its annulment grounds in K.S.A. 23-2702, and it reads more like contract law than Missouri’s rules do.
A Kansas court must annul a marriage that is void, or one induced by fraud – the statute gives the judge no choice on those two. It may also annul for “a mistake of fact, lack of knowledge of a material fact or any other reason justifying rescission of a contract of marriage” – a discretionary third category the statute treats like ordinary contract law.
That second group is broader than Missouri’s list. On the right facts, a Missouri divorce case could be a Kansas annulment case. State Line Road can change the answer.
Why divorce is usually the better route
People are sometimes surprised to hear a lawyer steer them away from an annulment. The reasons are practical:
- A divorce needs no proof of fault. In Missouri you show the marriage is irretrievably broken. In Kansas, incompatibility is enough. Neither asks why.
- An annulment needs evidence. You must prove the defect, and fraud is hard to prove.
- It is not faster. A contested annulment can take longer than an uncontested divorce, because the core question is disputed.
- The end result is mostly the same. You are single, you can remarry, and the court still decides custody and support for any children. You cannot use an annulment to sidestep custody or child support.
This page is not for someone who wants an annulment only because the marriage was short. Length is not a ground in either state, and the effort belongs in a straightforward divorce.
A church annulment is not a legal annulment
People often mix these up. A religious annulment, such as one granted through the Catholic Church, has no legal effect at all. It does not end the civil marriage, divide property, or settle custody.
The reverse is also true. A civil annulment or divorce from a Missouri or Kansas court does not change your status with your church.
Many people need both, and they are separate processes run by separate bodies. The civil side is the one that matters for property, children and the right to remarry under the law.
Legal separation, and separate maintenance in Kansas
A legal separation covers the same ground as a divorce: property, debts, custody, support and maintenance. The difference is that you stay married.
In Missouri, the court grants it where there is a reasonable chance the marriage can still be saved. Either spouse can move to convert it into a divorce, and the judge cannot grant that sooner than 90 days after the separation judgment, under Section 452.360. The same section makes the property division in either judgment final the moment it is entered – not something either spouse can reopen later, even on appeal, and even an appeal of the divorce itself does not stop either spouse from remarrying if the appeal does not challenge the finding that the marriage is broken.
Kansas calls it separate maintenance, granted on the same grounds as a divorce under K.S.A. 23-2701.
It costs about the same as a divorce. It is worth choosing only when staying married does something for you:
- Health insurance that would end with a divorce
- Religious beliefs that rule out divorce
- A genuine last attempt at reconciliation, with the finances already sorted
- A complex estate that needs time to untangle before a final decree
How long each one takes
Both states set a minimum before you can file and a minimum before a judge can finish the case.
- Missouri: one spouse must have lived in the state for 90 days before filing, or been a member of the armed services stationed there for that long, under Section 452.305. A divorce cannot be finalized sooner than 30 days after filing. The judge must also find “no reasonable likelihood that the marriage can be preserved” before granting it – that exact phrase, not just “irretrievably broken.”
- Kansas: the residency floor is 60 days in the state, counted up to when you file. There is a 60-day wait after filing before the final hearing. A Kansas petition must also be verified and list the name and birth date of every minor child, under K.S.A. 23-2704, backed by an affidavit under K.S.A. 23-37,209.
Those are floors, not estimates. An agreed divorce can finish close to them. A contested one, or a disputed annulment, runs on the court’s calendar and often takes months.
Common questions
What is the difference between a divorce and an annulment?
A divorce ends a valid marriage and needs no proof of fault. An annulment is a court ruling that the marriage was never valid. It needs proof of a defect that existed when you married, such as fraud, duress, bigamy or being underage.
Why is divorce often better than an annulment?
A divorce needs no proof of fault. An annulment makes you prove a defect, which can be hard and slow. The practical result is mostly the same. You are single and free to remarry, and the court still decides custody and support.
Can I get an annulment because the marriage was short?
No. The length of the marriage is not a ground for annulment in Missouri or Kansas. A short marriage with no defect at the start is ended by divorce.
Is a church annulment the same as a legal annulment?
No. A religious annulment has no legal effect on the civil marriage, property or custody. A civil annulment or divorce from a court does not change your standing with your church. Many people need both.
What happens to children if a marriage is annulled?
The court still decides custody, parenting time and child support. Annulment says the marriage was invalid. It does not change the children’s rights or either parent’s duties.
What is the difference between legal separation and divorce?
Both settle property, custody, support and maintenance. After a legal separation you are still married and cannot remarry. In Missouri either spouse can convert it to a divorce no sooner than 90 days after the separation judgment. Kansas calls it separate maintenance.
Are annulment rules different in Kansas?
Somewhat. Kansas must annul a void marriage or one induced by fraud. It may also annul for a mistake of fact or for not knowing a key fact. Other grounds that would undo a contract count too. That is broader than Missouri’s list.
Working out which one fits
Bring the date and place you married, and a plain account of what went wrong and when you found out. That is often enough to say whether an annulment is realistic. If not, a divorce or legal separation may serve you better.
What does it cost to find out? Nothing. The first conversation is free, and in most cases the answer is clear by the end of it.
This page describes how these rules generally work in Missouri and Kansas. Nothing here is legal advice about your situation and no outcome is promised. Talk to a lawyer about your own case before you decide anything.
My role at Hale Robinson & Robinson is family law associate, and divorce and annulment cases in both Missouri and Kansas are part of that work. See Sydney Garcia’s attorney profile for my background. Our divorce and family law attorneys in Kansas City handle divorce, annulment and separation in Missouri and in Kansas.
Credentials worth checking yourself: this firm is a BBB Accredited Business, rated A+ by the local BBB since August 2021. The firm also holds the 2021 Best Law Firm/Lawyer title from Kansas City Magazine.
Start with a free consultation. You can also call 816-605-1734 to ask which route fits. Within 24 hours, a lawyer will tell you whether we can help and what comes next.
